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Bio-capped and green synthesis of ZnO/g-C_(3)N_(4) nanocomposites and its improved antibiotic and photocatalytic activities: An exceptional approach towards environmental remediation 被引量:2
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作者 Iltaf khan Chunjuan Wang +7 位作者 Shoaib khan Jinyin Chen aftab khan Sayyar Ali Shah Aihua Yuan Sohail khan Mehwish KButt Humaira Asghar 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第4期215-224,共10页
In this research study, we have synthesized the bio-capped ZnO/g-C_(3)N_(4) nanocomposites by employing lemon juice(Citrus limon) as a stabilizer and mediator. Fruitfully, lemon juice which contains various acidic fun... In this research study, we have synthesized the bio-capped ZnO/g-C_(3)N_(4) nanocomposites by employing lemon juice(Citrus limon) as a stabilizer and mediator. Fruitfully, lemon juice which contains various acidic functional groups and citric acid has the capability to block the surface of g-C_(3)N_(4) from chemical reactivity and activated the surface of g-C_(3)N_(4) for various reactions. Consequently, the agglomeration behavior and controlled shape of g-C_(3)N_(4) has also been achieved. Our experimental results i.e. XRD,TEM, HRTEM, PL, FS, XPS, and PEC have confirmed that the lemon juice mediated and green g-C_(3)N_(4)(L-CN) have good performances and remarkable visible light photocatalytic activities as compared to the chemically synthesized g-C_(3)N_(4)(CN). Furthermore, the small surface area and low charge separation of g-C_(3)N_(4) is upgraded by coupling with Zn O nanoparticles. It is proved that the coupling of Zn O worked as a facilitator and photoelectron modulator to enhance the charge separation of g-C_(3)N_(4). Compared to pristine lemon-mediated green g-C_(3)N_(4)(L-CN), the most active sample 5Zn O/L-CN showed ~ 5-fold improvement in activities for ciprofloxacin(CIP) and methylene blue(MB) degradation. More specifically,the mineralization process and degradation pathways, and the mineralization process of ciprofloxacin(CIP) and methylene blue(MB) are suggested. Finally, our present novel research work will provide new access to synthesize the eco-friendly and bio-caped green g-C_(3)N_(4)nanomaterials and their employment for pollutants degradation and environmental purification. 展开更多
关键词 Bio-caped green g-C_(3)N_(4) Lemon juice mediators ZnO/g-C_(3)N_(4)nanocomposite Environmental remediation Degradation pathways
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Reflection of thermo-elastic wave in semiconductor nanostructures nonlocal porous medium 被引量:1
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作者 HASHMAT Ali ADNAN Jahangir aftab khan 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3188-3201,共14页
The current work is an extension of the nonlocal elasticity theory to fractional order thermo-elasticity in semiconducting nanostructure medium with voids.The analysis is made on the reflection phenomena in context of... The current work is an extension of the nonlocal elasticity theory to fractional order thermo-elasticity in semiconducting nanostructure medium with voids.The analysis is made on the reflection phenomena in context of three-phase-lag thermo-elastic model.It is observed that,four-coupled longitudinal waves and an independent shear vertical wave exist in the medium which is dispersive in nature.It is seen that longitudinal waves are damped,and shear wave is un-damped when angular frequency is less than the cut-off frequency.The voids,thermal and non-local parameter affect the dilatational waves whereas shear wave is only depending upon non-local parameter.It is found that reflection coefficients are affected by nonlocal and fractional order parameters.Reflection coefficients are calculated analytically and computed numerically for a material,silicon and discussed graphically in details.The results for local(classical)theory are obtained as a special case.The study may be useful in semiconductor nanostructure,geology and seismology in addition to semiconductor nanostructure devices. 展开更多
关键词 three-phase lag model semiconductor fractional order time derivative non-local theory NANOSTRUCTURE voids REFLECTION
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Rotational Effects on Magneto-Thermoelastic Stoneley, Love and RayleighWaves in Fibre-Reinforced Anisotropic General Viscoelastic Media of Higher Order
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作者 A.M.Abd-Alla S.M.Abo-Dahab aftab khan 《Computers, Materials & Continua》 SCIE EI 2017年第1期49-72,共24页
In this paper, we investigated the propagation of magneto-thermoelastic surfacewaves in fibre-reinforced anisotropic general viscoelastic media of higher order ofnth order,including time rate of strain under the influ... In this paper, we investigated the propagation of magneto-thermoelastic surfacewaves in fibre-reinforced anisotropic general viscoelastic media of higher order ofnth order,including time rate of strain under the influence of rotation and magnetic field.The generalsurface wave speed is derived to study the effects of rotation, magnetic field and thermal onsurface waves. Particular cases for Stoneley, Love and Rayleigh waves are discussed. Theresults obtained in this investigation are more general in the sense that some earlier publishedresults are obtained from our result as special cases. Our results for viscoelastic of order zeroare well agreed to fibre-reinforced materials. Comparison was made with the results obtainedin the presence and absence of rotation, magnetic field and parameters for fibre-reinforced ofthe material medium. It is also observed that, surface waves cannot propagate in a fast rotatingmedium. Numerical results for particular materials are given and illustrated graphically. Theresults indicate that the effect of rotation, magnetic field on fibre-reinforced anisotropic generalviscoelastic media are very pronounced. 展开更多
关键词 ibre-reinforced VISCOELASTIC surface waves rotation anisotropic THERMOELASTIC magnetic
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基于二维和三维分形分析技术的直肠癌患处局部血流空间异质性测量流程的结果再现性评估
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作者 Bal Sanghera Debasish Banerjee +4 位作者 aftab khan Ian Simcock J.James Stirling Rob Glynne-Jones Vicky Goh 《中国医疗设备》 2012年第12期1-6,共6页
目的使用容积螺旋CT灌注成像方法测量直肠癌患处的局部二维/三维血流分布分形属性,并评估该方法的结果再现性。材料与方法本研究获得制度审查委员会的批准和相关人员的知情同意。在本研究中,研究人员选取了10位疑似直肠腺癌患者(8男2女... 目的使用容积螺旋CT灌注成像方法测量直肠癌患处的局部二维/三维血流分布分形属性,并评估该方法的结果再现性。材料与方法本研究获得制度审查委员会的批准和相关人员的知情同意。在本研究中,研究人员选取了10位疑似直肠腺癌患者(8男2女,平均年龄72.3岁),在不进行介入治疗的情况下,24 h对选取的患者进行了2轮容积螺旋CT灌注成像(四维可调螺旋成像模式,z轴覆盖范围为11.4 cm),并通过反卷积方法计算得到直肠癌患部的局部血流信息。研究人员通过设定信号强度阈值,将肿瘤区域从背景信号中划分出来之后,对该区域进行了二维和三维分形分析,依此确定分形分析的分形维数和丰度。研究人员还使用Bland-Altman统计方法对统计结果的再现性进行定量评估,并利用二维和三维的缺项散点图定性评估结果再现性。统计显著性水平为5%。结果平均血液流速为63.50 mL/min/100 mL±8.95(标准差)。在重复多次的实验中,分形维数的分析结果具有良好的一致性;二维分形分析的平均差值为-0.024(95%一致性的平均差值界限:-0.212,0.372),三维分形分析的平均差为-0.024(95%一致性的平均差值界限:-0.307,0.355)。二维分形分析的分形丰度的平均差为-0.355(95%一致性的平均差值界限:-0.869,1.579),三维分形分析的分形丰度的平均差为-0.043(95%一致性的平均差值界限:-1.154,1.239)。三维分析中的95%一致性的平均差值界限比二维分析的窄。缺项散点图也直观地证实了多次试验结果之间的一致性。结论直肠癌的局部血流情况显示出了分形属性。对该区域的成像结果进行的二维/三维分形分析的结果具有良好的再现性。 展开更多
关键词 分形分析 三维分析 定量评估 再现性 直肠癌 空间异质性 二维 局部血流
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