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Separation of halogens and recovery of heavy metals from secondary copper smelting dust
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作者 Zhi-lou LIU Zhi-kang CHEN +7 位作者 Fu-ze SUN Zhi-heng ZHANG Kang YAN Shui-ping ZHONG Hui LIU Rui-xiang WANG Jia-yuan LI Zhi-feng XU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第8期2686-2701,共16页
The separation of halogens and recovery of heavy metals from secondary copper smelting(SCS)dust using a sulfating roasting−water leaching process were investigated.The thermodynamic analysis results confirm the feasib... The separation of halogens and recovery of heavy metals from secondary copper smelting(SCS)dust using a sulfating roasting−water leaching process were investigated.The thermodynamic analysis results confirm the feasibility of the phase transformation to metal sulfates and to gaseous HF and HCl.Under the sulfating roasting conditions of the roasting temperature of 250℃ and the sulfuric acid excess coefficient of 1.8,over 74 wt.%of F and 98 wt.%of Cl were volatilized into flue gas.Approximately 98.6 wt.%of Zn and 96.5 wt.%of Cu in the roasting product were dissolved into the leaching solution after the water leaching process,while the leaching efficiencies of Pb and Sn were only 0.12%and 0.22%,respectively.The mechanism studies indicate the pivotal effect of roasting temperature on the sulphation reactions from various metal species to metal sulfates and the salting out reactions from various metal halides to gaseous hydrogen halides. 展开更多
关键词 secondary copper smelting dust sulfating roasting water leaching halogen volatilization heavy metal separation
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Sensitive determination of fenpropathrin,cyhalothrin and deltamethrin in environmental water samples using multiwalled carbon nanotubes cartridge prior to HPLC 被引量:3
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作者 Qing Xiang Zhou Guo Hong Xie +2 位作者 Jun Ping Xiao Wei Dong Wang Yu Jie Ding 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第1期95-98,共4页
This paper described a new method for the trace determination of fenpropathrin, cyhalothrin and deltamethrin using multiwalled carbon nanotubes (MWCNTs) cartridge. Important parameters, such as the sample pH, eluent... This paper described a new method for the trace determination of fenpropathrin, cyhalothrin and deltamethrin using multiwalled carbon nanotubes (MWCNTs) cartridge. Important parameters, such as the sample pH, eluent and its volume, sample flow rate and sample volume were investigated in detail. The linear ranges, the detection limits, and precisions (R.S.D.) were in the range of 0.1- 40 μg L^-11, 1.34.3 ng L^-1 and 2.3-2.8%, respectively. The performance of the proposed method was validated with real water samples, and the spiked recoveries were in the range of 91.7-117.8%, respectively. The experimental results demonstrated that the proposed method was an excellent alternative for the routine analysis of such pollutants in environmental samples. 2007 Qing Xiang Zhou. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved. 展开更多
关键词 Multiwalled carbon nanotubes FENPROPATHRIN CYHALOTHRIN DELTAMETHRIN High performance liquid chromatography
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Recent Progress in Synthesis, Mechanism and Applications of Zinc-Based Metal-Organic Frameworks for Fluorescent Sensing
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作者 Xiaojing Mao Huachang Li +2 位作者 Jiemin Liu Yehong Shi Lijun Kuai 《American Journal of Analytical Chemistry》 2023年第9期390-409,共20页
As more and more pollutants threaten human health, it is necessary and essential to develop sensitive, accurate and rapid methods and sensory materials to detect harmful substance. Metal-organic frameworks (MOFs) are ... As more and more pollutants threaten human health, it is necessary and essential to develop sensitive, accurate and rapid methods and sensory materials to detect harmful substance. Metal-organic frameworks (MOFs) are inorganic-organic hybrids assembled from inorganic metal ions or clusters and suitable organic ligands. Zinc-based MOFs (Zn-MOFs) have emerged as one of the most promising sensory material of MOFs for practical applications, and attracted significant attention due to structural diversity and incomparable stability properties. However, there are few reviews on systemic summary of synthesis design, mechanism and application of Zn-MOFs. In this review, we summarize the synthesis design methods, structure types and luminescence mechanism of Zn-MOFs sensor recognition in the past ten years and their applications in metal cations, anions, organic compounds and other analytes. Finally, we present a short conclusion, and look forward to the future development direction of Zn-MOFs. 展开更多
关键词 Metal-Organic Frameworks POLLUTANTS Sensory Materials MECHANISM Application
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Thermal Stability and Thermal Decomposition Kinetics of 1-Butyl-3-methylimidazolium Dicyanamide 被引量:5
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作者 梁蕊 杨美荣 轩小鹏 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第5期736-741,共6页
Thermal stability and thermal decomposition kinetics of 1-butyl-3-methylimidazolium dicyanamide ([bmin+][N(CN) ]2-) were investigated using both isothermal and non-isothermal thermogravimetric analyses (TGA) under hig... Thermal stability and thermal decomposition kinetics of 1-butyl-3-methylimidazolium dicyanamide ([bmin+][N(CN) ]2-) were investigated using both isothermal and non-isothermal thermogravimetric analyses (TGA) under high pure nitrogen as carrier gas. The long-term thermogravimetric studies revealed that the highest temperature used should be 110 °C, at which [bmin+][N(CN)2-] lost less than 10% by mass in 10 hours. The non-isothermal activation energy values determined using Friedman and ASTM methods were (150±13) and (147±2) kJ·mol –1 , respectively. Multivariate non-linear-regression methods showed that expanded Fn and CnB models were the best fit models with highest correlation coefficient of 0.9994, and the apparent activation energies were consistent with iso-conversional methods. 展开更多
关键词 ionic liquids long-term thermal stability kinetics of thermal decomposition iso-conversional method
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Determination of aniline in environmental water samples by alternating-current oscillopolarographic titration 被引量:6
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作者 Jun Ping Xiao Qing Xiang Zhou +2 位作者 Xiao Ke Tian Hua Hua Bai Xian Fa Su 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第6期730-733,共4页
A new method for the determination of aniline in environmental water based on oscillopolarographic titration was presented in this paper. Several factors including the kind, concentration, and volume of acid, the dosa... A new method for the determination of aniline in environmental water based on oscillopolarographic titration was presented in this paper. Several factors including the kind, concentration, and volume of acid, the dosage of potassium bromide, the temperature and concentration of concomitant substances were investigated in detail. The experimental results indicated that this method was simple, rapid, and sensitive. The linear range was 8.367 × 10(?4) to 2.789 × 10(?2) mol L(?1), the relative standard deviation (R.S.D.) was lower than 0.96%, and the spiked recoveries of aniline in environmental water samples were in the range of 99.4–106.9% under the optimal conditions. The results indicated that the present method could be used as an alternative method for aniline determination in realworld water samples. 展开更多
关键词 Alternating-current oscillopolarographic titration ANILINE Potassium bromide
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Enhancement of Sensitivity for Determination of Phenols in Environmental Water Samples by Single-drop Liquid Phase Microextraction Using Ionic Liquid prior to HPLC 被引量:5
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作者 Qing Xiang ZHOU Jun Ping XIAO +1 位作者 Cun Ling YE Xin Ming WANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第8期1073-1076,共4页
A single-drop liquid phase micro-extraction procedure using 1-butyl-3-methylimidazolium hexafluorophosphate ([C4MIM][PF6]) was demonstrated for the sensitive determination of four phenols in water samples. Under the... A single-drop liquid phase micro-extraction procedure using 1-butyl-3-methylimidazolium hexafluorophosphate ([C4MIM][PF6]) was demonstrated for the sensitive determination of four phenols in water samples. Under the optimized conditions, the linear range of proposed method was excellent in the range of 0.5-100 μg·L^-1, the reproducibility (RSD, n=6) were in the range 5.4%-8.9% and detection limits (S/N=3) were 0.3, 0.3, 0.5 and 0.5 μg·L^-1 for 2, 4-dichlorophenol, 2-naphthol, 2-nitrophenol and 4-chlorophenol, respectively. The experimental results indicated that the effect of complex matrices natural water samples could be resolved with addition of sodium ethylene diamine tetracetate (EDTA) into the samples. Excellent spiked recoveries were achieved for these four phenols ranged from 86.2%-114.9 %. All these facts demonstrated that the proposed method with merits of low cost, simplicity and easy operating would be a competitive alternative procedure for the determination of such compounds at trace level. 展开更多
关键词 1-Butyl-3-methylimidazolium hexafluorophosphate single-drop liquid phase microextraction phenols.
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Synthesis of fused pyran and arylbis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)methane in ionic liquid 被引量:2
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作者 Xue Sen Fan Ying Ying Qu Xin Ying Zhang Xia Wang Jian Ji Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第4期387-390,共4页
Promoted and mediated by an ionic liquid-[bmim][BF4], fused pyrans or arylbis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3- yl)methanes were efficiently and selectively prepared from the reaction of aldehyde and 4-hydroxy-6-... Promoted and mediated by an ionic liquid-[bmim][BF4], fused pyrans or arylbis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3- yl)methanes were efficiently and selectively prepared from the reaction of aldehyde and 4-hydroxy-6-methyl-2-oxo-pyran with or without acetic anhydride. By using these novel procedures, pyrimidine nucleoside-fused pyran and arylbis(pyranon-3-yl)methane hybrids with potential biological activities were constructed. 展开更多
关键词 Ionic liquid Fused pyran Arylbis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)methane Pyrimidine nucleoside Green synthesis
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Investigation of the interaction between HIV-1 DNA and cyclic peptides by electrospray ionization mass spectrometry 被引量:2
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作者 Yi Quan Liu Hui Hui Li +1 位作者 Yun Hua Ye Gu Yua 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第3期330-333,共4页
The interaction between HIV-1 DNA and five cyclic peptides (CP1-CP5) was investigated using electrospray ionization mass spectrometry (ESI-MS). It revealed that CP1 [c(Ala-Tyr-Leu-Ala-Gly)] and CP4 [c(Pro-D-Tyr... The interaction between HIV-1 DNA and five cyclic peptides (CP1-CP5) was investigated using electrospray ionization mass spectrometry (ESI-MS). It revealed that CP1 [c(Ala-Tyr-Leu-Ala-Gly)] and CP4 [c(Pro-D-Tyr-Leu-D-Ala-Gly)] have the higher binding affinity with the duplex DNA among the five cyclic peptides. 展开更多
关键词 HIV-1 DNA Cyclic peptide ESI-MS
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An efficient and green preparation of 5-aminophosphonate substituted pyrimidine nucleosides under solvent-free conditions 被引量:1
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作者 Xin Ying Zhang Ying Ying Qu Xue Sen Fan 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第10期1191-1194,共4页
An environmentally benign and highly efficient one-pot preparation of α-aminophosphonates under solvent-free conditions was developed. By employing this method, 5-aminophosphonate substituted pyrimidine nucleosides w... An environmentally benign and highly efficient one-pot preparation of α-aminophosphonates under solvent-free conditions was developed. By employing this method, 5-aminophosphonate substituted pyrimidine nucleosides were synthesized in good to excellent yields starting from 5-forrnyl-2'-deoxyuridine, aniline and dimethylphosphite. 展开更多
关键词 AMINOPHOSPHONATE 5-Substituted pyrimidine nucleoside Solvent-free reaction Green synthesis
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Preparation and Characterization of ZrO_2 Nanoparticles Capped by Trioctylphosphine Oxide (TOPO) 被引量:1
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作者 马剑琪 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第4期611-614,共4页
Monodisperse ZrO2 nanoparticles capped by trioctylphosphine oxide (TOPO) were prepared in non-aqueous solvent using in-situ synthesis method. Transmission electron microscopy(TEM), X-ray diffraction(XRD), X-ray ... Monodisperse ZrO2 nanoparticles capped by trioctylphosphine oxide (TOPO) were prepared in non-aqueous solvent using in-situ synthesis method. Transmission electron microscopy(TEM), X-ray diffraction(XRD), X-ray photoelectron spectrometer(XPS), Fourier transformation infrared spectroscopy (FTIR), and thermogravimetric analysis(TGA) were adopted to characterize and investigate the size, structure, composition, and the binding manners between organic capping agent TOPO and inorganic ZrO2 nanocores of the as-prepared nanoparticles. In addition, the nanoparticles were also studied to determine their solubility and relative stability. The experimental results show that the prepared nanoparticles contain about 25% organic capping shell TOPO, 75% inorganic ZrO2 nanocores, and can be easily dissolved and be stably disersed in non-polar organic solvents. 展开更多
关键词 ZrO2 nanoparticles trioctylphosphine oxide (TOPO) MONODISPERSE SOLUBILITY
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Rapid determination of atrazine in environmental water samples by a novel liquid phase microextraction 被引量:1
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作者 Qing Xiang Zhou Guo Hong Xie Long Pang 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第1期89-91,共3页
A novel method was described for the rapid determination of atrazine using dispersive liquid phase microextraction in combination with high performance liquid chromatography (HPLC). Possible impact parameters such a... A novel method was described for the rapid determination of atrazine using dispersive liquid phase microextraction in combination with high performance liquid chromatography (HPLC). Possible impact parameters such as sample pH, extraction and disperser solvents, salting-out effect, and extraction time were investigated. The experimental results indicated that proposed method possessed an excellent analytical performance, The linear range, detection limit, and precision (R.S.D.) were 0.1- 50 ng mL- 1 (R2 = 0.9955), 0.601 ng mL- 1 and 6,4%, respectively. The proposed method was validated with the real water samples, and the spiked recoveries were in the range of 69.9-89.8%, respectively. These results indicated that the established method with high enrichment factor, short extraction time was an excellent alternative for the routine analysis of atrazine in environmental samples. 2007 Qing Xiang Zhou. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved. 展开更多
关键词 Liquid phase microextraction ATRAZINE High performance liquid chromatography Water samples
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TiO_2 nanotubes:A novel solid phase extraction adsorbent for the sensitive determination of nickel in environmental water samples 被引量:1
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作者 Xin Ning Zhao Qi Zeng Shi +1 位作者 Guo Hong Xie Qing Xiang Zhou 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第7期865-867,共3页
A novel method was developed for the sensitive determination of nickel in environmental water samples by using TiO2 nanotubes, a new nanomaterial, as solid phase extraction absorbent. In general, TiO2 nanomaterials we... A novel method was developed for the sensitive determination of nickel in environmental water samples by using TiO2 nanotubes, a new nanomaterial, as solid phase extraction absorbent. In general, TiO2 nanomaterials were often used for catalytic degradation of pollutants in environmental field, and only a very few application in environmental analytic chemistry. In present work, TiO2 nanotubes was firstly used for the enrichment of nickel and the factors would influence the preconcentration performance were optimized. Under the optimal conditions, TiO2 nanotubes exhibited its good enrichment capacity for nickel and the detection limit of the proposed method was 1 ng· mL^-1. The proposed method was validated with real water samples, and excellent results were obtained with the spiked recoveries in the range of 94.4-99.2%, respectively. 展开更多
关键词 TiO2 nanotubes NICKEL Flame atomic absorption spectrometry
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Preparation of nucleoside-pyridine hybrids and pyridine attached acylureas from an unexpected uracil ring-opening and pyridine ring-forming sequence
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作者 Xue Sen Fan Xia Wang Xin Ying Zhang Dong Feng Ying Ying Qu 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第10期1161-1165,共5页
Novel pyrimidine nucleoside-3,5-dicyanopyridine hybrids (4) or pyridine attached acylureas (5) were selectively and efficiently prepared from the reaction of 2′-deoxyuddin-5-yl-methylene malononitrile (1), malo... Novel pyrimidine nucleoside-3,5-dicyanopyridine hybrids (4) or pyridine attached acylureas (5) were selectively and efficiently prepared from the reaction of 2′-deoxyuddin-5-yl-methylene malononitrile (1), malononitrile (2) and thiophenol (3) or from an unexpected uracil ring-opening and pyddine ring-forming sequence via the reaction of 1 and 3. It is the first time such a sequence has ever been reported. 展开更多
关键词 Pyrimidine nucleoside PYRIDINE Acylureas Ring-opening and -forming reaction
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Rapid and Efficient Synthesis of Diaryl Carbazones using Microwave Technology
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作者 SHI Lei PAN Feng WANG Yu-lu 《合成化学》 CAS CSCD 2004年第z1期72-72,共1页
关键词 Diaryl carbazones NaBrO3/H2SO4 MICROWAVE TECHNOLOGY
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Settlement Area of Cr Content Decided by Source and Topographic Features
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作者 Yang Dongfang Zhu Sixi +2 位作者 Wang Zhikang Yang Xiuqin Wang Fengyou 《Meteorological and Environmental Research》 CAS 2017年第6期70-71,77,共3页
Based on the investigation data of Jiaozhou Bay waters in 1981,change range,horizontal distribution and vertical change of Cr content in surface and bottom waters of Jiaozhou Bay were studied. The results showed that ... Based on the investigation data of Jiaozhou Bay waters in 1981,change range,horizontal distribution and vertical change of Cr content in surface and bottom waters of Jiaozhou Bay were studied. The results showed that at change scale,Cr contents from surface and bottom layers had same change range in Jiaozhou Bay waters of August; at space scale,Cr contents from surface and bottom layers had converse change trend;at vertical scale,Cr contents from surface and bottom layers had similar change. At regional scale,Cr content from surface layer was more than that from bottom layer in Jiaozhou Bay waters except stations A3 and A6; at stations A6 and A3,Cr content from surface layer was less than that from bottom layer. It illustrated that high settlement area of bottom Cr content was in estuary of Haibo River and sunken waters of bay mouth.Therefore,the source and special topographic features decided high settlement area of Cr content in Jiaozhou Bay waters. 展开更多
关键词 Cr CONTENT VERTICAL CHANGE Topographic FEATURES High SETTLEMENT area Jiaozhou BAY
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The Impacts of Regional Rainfall and Upstream Effect on Runoff of Xiangjiang River of Guizhou
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作者 Yang Dongfang Wang Lin +2 位作者 Zhang Rong Zhu Sixi Suo Hongmin 《Meteorological and Environmental Research》 CAS 2017年第2期79-84,共6页
Based on monthly runoff data of Xiangjiang River of Guizhou from June 2013 to June 2015 and monthly runoff data of Yachi River of Guizhou from April 2014 to May 2015,using REOF and multiple linear regression analysis,... Based on monthly runoff data of Xiangjiang River of Guizhou from June 2013 to June 2015 and monthly runoff data of Yachi River of Guizhou from April 2014 to May 2015,using REOF and multiple linear regression analysis,the effects of regional rainfall and monthly runoff of upstream river on monthly runoff of Xiangjiang River were studied. Seasonal temporal-spatial change of monthly runoff of Xiangjiang River and Yachi River mainly had two kinds of modalites. The first modality was artificial influence mode,which was absolutely main component of seasonal change of monthly runoff in Xiangjiang River and Yachi River,and peak appeared during August-October. Here,component of Yachi River was far larger than that of Xiangjiang River,and artificial control ability of monthly runoff in Xiangjiang River was far larger than Yachi River. The second modality was natural influence mode,and peak appeared in July. Xiangjiang River and Yachi River had similar natural influence component,and the component was only tiny part of seasonal change of monthly runoff in Xiangjiang River and Yachi River. Water gathering change of Xiangjiang River headstream showed by monthly runoff of Yachi River and the first mode of regional rainfall were main influence factors of monthly runoff of Xiangjiang River. Monthly runoff of Xiangjiang River,monthly runoff of Yachi River and the first mode of regional rainfall all had the same-phase seasonal change. 展开更多
关键词 Xiangjiang RIVER Yachi RIVER MONTHLY RUNOFF REOF analysis RAINFALL China
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Binding mechanism of halide ions to bovine serum albumin and hemoglobin: investigated by ion selective-electrode
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作者 Gongke Wang Wen Tang +2 位作者 Xiaoxiao Hao Changling Yan Yan Lu 《Journal of Biophysical Chemistry》 2011年第3期194-201,共8页
The binding mechanism of the interactions of halide ions (F–, Br– and I–) with bovine serum albumin (BSA) and hemoglobin (Hb) were studied at different temperatures, by using ion-selective electrodes. The experimen... The binding mechanism of the interactions of halide ions (F–, Br– and I–) with bovine serum albumin (BSA) and hemoglobin (Hb) were studied at different temperatures, by using ion-selective electrodes. The experimental data were treated according to Klotz equation, and the number of binding sites and the binding constants were determined. The results show that the binding sites of F– on protein molecules are more than those of Br– and I–. Additionally, the number of the binding sites for halide ions on protein molecules increases with increasing temperature. This study also indicates that the binding constants for the interactions of halide ions with proteins gradually decrease as the size of halide ions and temperature increases. These behaviors were reasonably interpreted with the structural and thermodynamic factors. The thermodynamic functions at different temperatures were calculated with thermodynamic equations, and the enthalpy change for the interactions were also determined by isothermal titration calorimetry (ITC) at 298.15 K, which indicate that the interactions of halide ions with proteins are mainly electrostatic interaction. 展开更多
关键词 Binding Mechanism Interaction Ion-Selective ELECTRODE BOVINE Serum ALBUMIN HEMOGLOBIN
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Recent progress of in situ/operando characterization techniques for electrocatalytic energy conversion reaction
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作者 Zhao Li Huimin Yang +1 位作者 Wenjing Cheng Lin Tian 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第9期92-101,共10页
Catalysts can significantly promote the reaction dynamics and are therefore considered crucial components for achieving high electrochemical energy conversion efficiency.However,the active sites of the catalysts,parti... Catalysts can significantly promote the reaction dynamics and are therefore considered crucial components for achieving high electrochemical energy conversion efficiency.However,the active sites of the catalysts,particularly for nano-level and atomic-level catalysts commonly undergo reconstruction under practical applications.Therefore,obtaining an in-depth and systematic understanding on the real active sites through in situ/operando characterization techniques is a prerequisite for establishing the structureperformance relationship and guiding the future design of more efficient electrocatalysts.Herein,we summarize the recent progress of in situ/operando characterization techniques for identifying the nature of active sites of electrocatalysts when used in electrocatalytic energy conversion reaction.Specifically,our focus lies in the fundamental principles of various in situ/operando characterization techniques,with particular emphasis on their applications for electrocatalytic reactions.Beyond that,the challenges and perspective insights are also added in the final section to highlight the future direction of this important field. 展开更多
关键词 In situ techniques ELECTROCATALYSIS Active sites Energy conversion
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Treatment of naphthalene derivatives with iron-carbon micro-electrolysis 被引量:20
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作者 王玉萍 王连军 +1 位作者 彭盘英 陆天虹 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2006年第6期1442-1447,共6页
The degradation of five naphthalene derivatives in the simulated wastewater was investigated using the iron-carbon micro-electrolysis method.The optimal initial pH of solution and adsorption of iron-carbon and removal... The degradation of five naphthalene derivatives in the simulated wastewater was investigated using the iron-carbon micro-electrolysis method.The optimal initial pH of solution and adsorption of iron-carbon and removal efficiency of the total organic carbon(TOC)were investigated.The results show that the removal efficiency of the naphthalene derivatives can reach 48.9%?92.6% and the removal efficiency of TOC is 42.8%?78.0% for the simulated wastewater with 200 mg/L naphthalene derivatives at optimal pH of 2.0?2.5 after 120 min treatment.The degradation of five naphthalene derivatives with the micro-electrolysis shows the apparent first-order kinetics and the order of removal efficiency of the naphthalene derivatives is sodium 2-naphthalenesulfonate,2-naphthol,2,7-dihydroxynaphthalene,1-naphthamine,1-naphthol-8-sulfonic acid in turn.It is illustrated that the substituents of the naphthalene ring can affect the removal efficiency of naphthalene due to their electron-withdrawing or electron-donating ability. 展开更多
关键词 cast iron SCRAP MICRO-ELECTROLYSIS NAPHTHALENE SUBSTITUENT WASTEWATER TREATMENT
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Application of multiwalled carbon nanotubes treated by potassium permanganate for determination of trace cadmium prior to flame atomic absorption spectrometry 被引量:3
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作者 XIAO Jun-ping ZHOU Qing-xiang BAI Hua-hua 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第10期1266-1271,共6页
In this study we investigated the enrichment ability of oxidized multiwalled carbon nanotubes (MWCNTs) and established a new method for the determination of trace cadmium in environment with flame atomic absorption ... In this study we investigated the enrichment ability of oxidized multiwalled carbon nanotubes (MWCNTs) and established a new method for the determination of trace cadmium in environment with flame atomic absorption spectrometry. The MWCNTs were oxidized by potassium permanganate under appropriate conditions before use as preconcentration packing. Parameters influencing the recoveries of target analytes were optimized. Under optimal conditions, the target analyte exhibited a good linearity (R^2=0.9992) over the concentration range 0.5-50 ng/ml. The detection limit and precision of the proposed method were 0.15 ng/ml and 2.06%, respectively. The proposed method was applied to the determination of cadmium in real-world environmental samples and the recoveries were in the range of 91.3%-108.0%. All these experimental results indicated that this new procedure could be applied to the determination of trace cadmium in environmental waters. 展开更多
关键词 multiwalled carbon nanombes (MWCNTs) solid-phase extraction flame atomic absorption spectrometry
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