In this study, strain tsl-2, which could effectively degrade azo dye amaranth, was isolated from activated sludge in the sewage treatment pool of a print- ing and dyeing mill in Liaocheng City, Shandong Province. Base...In this study, strain tsl-2, which could effectively degrade azo dye amaranth, was isolated from activated sludge in the sewage treatment pool of a print- ing and dyeing mill in Liaocheng City, Shandong Province. Based on morphological characteristics, physiological and biochemical properties and 16S rDNA se- quence analysis, the isolated strain was identified preliminarily as Leucobacter komagatae. The decolorization of strain tsl-2 was investigated under static culture conditions. The results showed that strain tsl-2 exhibited the highest decolorization rate when initial concentration of amaranth was 50 rag/L, and the maximum de- colorization concentration was 1 250 mg/L. After decolorization under optimal conditions for 14 h, the decolorization rate of amaranth reached above 95%. This study provided the basis for further optimization of azoreductase production conditions.展开更多
An effective strategy was proposed to control the formation of the interfacial bonding between Ru and molybdenum oxide support to stabilize the Ru atoms with the aim to enhance the hydrogen evolution reaction(HER)acti...An effective strategy was proposed to control the formation of the interfacial bonding between Ru and molybdenum oxide support to stabilize the Ru atoms with the aim to enhance the hydrogen evolution reaction(HER)activity of the resultant catalysts in alkaline medium.The different interfacial chemical bonds,including Ru–O,Ru–O–Mo,and mixed Ru–Mo/Ru–O–Mo,were prepared using an induced activation strategy by controlling the composition of reducing agents in the calcination process.And the regulation mechanism of the interfacial chemical bonds in molybdenum oxide supported Ru catalysts for optimizing HER activity was investigated by density functional theory(DFT)and experimental studies.We found that a controlled interfacial chemical Ru–O–Mo bonding in Ru-MoO_(2)/C manifests a 12-fold activity increase in catalyzing the hydrogen evolution reaction relative to the conventional metal/metal oxide catalyst(Ru-O-MoO_(2)/C).In a bifunctional effect,the interfacial chemical Ru-O-Mo sites promoted the dissociation of water and the production of hydrogen intermediates that were then adsorbed on the nearby Ru surfaces and recombined into molecular hydrogen.As compared,the nearby Ru surfaces in Ru–Mo bonding have weak adsorption capacity for the generation of these hydrogen intermediates,resulting in a 5-fold increase HER activity for Ru-Mo-MoO_(2)/C catalyst compared with Ru-O-MoO_(2)/C.展开更多
A novel GO modified g-C_(3)N_(4) nanosheets/flower-like BiOBr hybrid photocatalyst is fabricated by a facile method.The characterization results reveal that wrinkled GO is deposited between g-C_(3)N_(4) nanosheets and...A novel GO modified g-C_(3)N_(4) nanosheets/flower-like BiOBr hybrid photocatalyst is fabricated by a facile method.The characterization results reveal that wrinkled GO is deposited between g-C_(3)N_(4) nanosheets and flower-like BiOBr forming a Z-scheme heterojunction.As a mediator,plicate GO plays a positive role in prompting photogene rated electrons transfe rring through its sizeable 2 D/2 D contact surface area.The g-C3 N4/GO/BiOBr hybrid displays a superior photocatalytic ability to g-C_(3)N_(4) and BiOBr in photodegrading tetracycline(TC),whose removal efficiency could reach 96%within 2 h.Besides,g-C_(3)N_(4)/GO/BiOBr composite can reduce Cr(Ⅵ),and simultaneously treat TC and Cr(Ⅵ)combination contaminant under the visible light The g-C_(3)N_(4)/GO/BiOBr ternary composite also exhibits satisfactory stability and reusability after four cycling experiments.Further,a feasible mechanism related to the photocatalytic process of gC_(3)N_(4)/GO/BiOBr is put forward.This study offers a te rnary hybrid photocatalyst with eco-friendliness and hopeful application in water pollution.展开更多
Gd_(2) O_(3) nanoparticles modified g-C_(3) N_(4) photocatalytic composites were synthesized by a simple one-step hydrothermal method.The structure,morphology,optical properties of the prepared photocatalyst were char...Gd_(2) O_(3) nanoparticles modified g-C_(3) N_(4) photocatalytic composites were synthesized by a simple one-step hydrothermal method.The structure,morphology,optical properties of the prepared photocatalyst were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),field emission transmission electron microscopy(FETEM) and X-ray photoelectron spectroscopy(XPS).The result demonstrates that gadolinium is mainly dispersed on the surface of g-C_(3) N_(4) in the form of Gd_(2) O_(3),and does not destroy the lattice structure of g-C_(3) N_(4).Besides,the gadolinium can cause the red shift of the absorption edge of light,narrow the band gap,and increase the separation efficiency of the photogenerated electron and hole of g-C_(3) N_(4).Especially,the specific surface area of g-C_(3) N_(4) can be significantly increased.Furthermore,g-C_(3) N_(4)/Gd-0.05 displays the highest photodegradation performance when it is used for degradation of methyl orange(MO),methylene blue(MB) and Rhodamine B(RhB).The photodegradation rate of g-C_(3) N_(4)/Gd-0.05 composites is 72.4% for MO,95.5% for RhB,100% for MB after120 min under visible light(λ> 420 nm) irradiation.Narrow band gap promotes the separation of photogenerated electron and hole,which enhances the photocatalytic activity of g-C_(3) N_(4).It is noted that g-C_(3) N_(4)/Gd-0.05 exhibits excellent photocatalytic stability by the photocurrent and the cyclic photodegradation of MO.展开更多
基金Supported by National Natural Science Foundation of China(31170110)
文摘In this study, strain tsl-2, which could effectively degrade azo dye amaranth, was isolated from activated sludge in the sewage treatment pool of a print- ing and dyeing mill in Liaocheng City, Shandong Province. Based on morphological characteristics, physiological and biochemical properties and 16S rDNA se- quence analysis, the isolated strain was identified preliminarily as Leucobacter komagatae. The decolorization of strain tsl-2 was investigated under static culture conditions. The results showed that strain tsl-2 exhibited the highest decolorization rate when initial concentration of amaranth was 50 rag/L, and the maximum de- colorization concentration was 1 250 mg/L. After decolorization under optimal conditions for 14 h, the decolorization rate of amaranth reached above 95%. This study provided the basis for further optimization of azoreductase production conditions.
基金supports by the National Natural Science Foundation of China(No.21978126).
文摘An effective strategy was proposed to control the formation of the interfacial bonding between Ru and molybdenum oxide support to stabilize the Ru atoms with the aim to enhance the hydrogen evolution reaction(HER)activity of the resultant catalysts in alkaline medium.The different interfacial chemical bonds,including Ru–O,Ru–O–Mo,and mixed Ru–Mo/Ru–O–Mo,were prepared using an induced activation strategy by controlling the composition of reducing agents in the calcination process.And the regulation mechanism of the interfacial chemical bonds in molybdenum oxide supported Ru catalysts for optimizing HER activity was investigated by density functional theory(DFT)and experimental studies.We found that a controlled interfacial chemical Ru–O–Mo bonding in Ru-MoO_(2)/C manifests a 12-fold activity increase in catalyzing the hydrogen evolution reaction relative to the conventional metal/metal oxide catalyst(Ru-O-MoO_(2)/C).In a bifunctional effect,the interfacial chemical Ru-O-Mo sites promoted the dissociation of water and the production of hydrogen intermediates that were then adsorbed on the nearby Ru surfaces and recombined into molecular hydrogen.As compared,the nearby Ru surfaces in Ru–Mo bonding have weak adsorption capacity for the generation of these hydrogen intermediates,resulting in a 5-fold increase HER activity for Ru-Mo-MoO_(2)/C catalyst compared with Ru-O-MoO_(2)/C.
基金financially supported by the National Natural Science Foundation of China(Nos.21667019,22066017,and 22002057)the Key Project of Natural Science Foundation of Jiangxi Province(No.20171ACB20016)+11 种基金the Jiangxi Province Major Academic and Technical Leaders Cultivating Object Program(No.20172BCB22014)the Science and Technology Department of Jiangxi Province(Nos.20181BCB18003 and 20181ACG70025)the Key Laboratory of Photochemical Conversion and Optoelectronic Materials,TIPC,CSA(No.PCOM201906)the Key Project of Science and Technology Research of the Jiangxi Provincial Department of Education(Nos.DA201602063 and GJJ191044)the Aviation Science Foundation of China(No.2017ZF56020)Fujian Key Laboratory of Measurement and Control System for of Shore Environment(No.S1-KF1703)the Doctor’s Start-up Fund of Nanchang Hangkong University(No.EA201902286)the National Natural Science Foundation of China(Nos.51702284,21878270 and 21922811)Zhejiang Provincial Natural Science Foundation of China(No.LR19B060002)the Fundamental Research Funds for the Central Universitiesthe Startup Foundation for Hundred-Talent Program of Zhejiang University。
文摘A novel GO modified g-C_(3)N_(4) nanosheets/flower-like BiOBr hybrid photocatalyst is fabricated by a facile method.The characterization results reveal that wrinkled GO is deposited between g-C_(3)N_(4) nanosheets and flower-like BiOBr forming a Z-scheme heterojunction.As a mediator,plicate GO plays a positive role in prompting photogene rated electrons transfe rring through its sizeable 2 D/2 D contact surface area.The g-C3 N4/GO/BiOBr hybrid displays a superior photocatalytic ability to g-C_(3)N_(4) and BiOBr in photodegrading tetracycline(TC),whose removal efficiency could reach 96%within 2 h.Besides,g-C_(3)N_(4)/GO/BiOBr composite can reduce Cr(Ⅵ),and simultaneously treat TC and Cr(Ⅵ)combination contaminant under the visible light The g-C_(3)N_(4)/GO/BiOBr ternary composite also exhibits satisfactory stability and reusability after four cycling experiments.Further,a feasible mechanism related to the photocatalytic process of gC_(3)N_(4)/GO/BiOBr is put forward.This study offers a te rnary hybrid photocatalyst with eco-friendliness and hopeful application in water pollution.
基金Project supported by the National Natural Science Foundation of China (51664047,21667019,22066017)the First Training-class High-end Talents Projects of Science and Technology Innovation in Jiangxi Province (CK202002473)+4 种基金the Key of Natural Science Foundation of Jiangxi Province (20171ACB20016)the Jiangxi Province Major Academic and Technical Leaders Cultivating Object Program (20172BCB22014)the Science and Technology Department of Jiangxi Province(20181BCB18003,20181ACG70025)the Key of Science and Technology Research of the Jiangxi Provincial Department of Education (GJJ191044,GJJ191058)Fujian Key Laboratory of Measurement and Control System for Of-Shore Environment (S1-KF1703)。
文摘Gd_(2) O_(3) nanoparticles modified g-C_(3) N_(4) photocatalytic composites were synthesized by a simple one-step hydrothermal method.The structure,morphology,optical properties of the prepared photocatalyst were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),field emission transmission electron microscopy(FETEM) and X-ray photoelectron spectroscopy(XPS).The result demonstrates that gadolinium is mainly dispersed on the surface of g-C_(3) N_(4) in the form of Gd_(2) O_(3),and does not destroy the lattice structure of g-C_(3) N_(4).Besides,the gadolinium can cause the red shift of the absorption edge of light,narrow the band gap,and increase the separation efficiency of the photogenerated electron and hole of g-C_(3) N_(4).Especially,the specific surface area of g-C_(3) N_(4) can be significantly increased.Furthermore,g-C_(3) N_(4)/Gd-0.05 displays the highest photodegradation performance when it is used for degradation of methyl orange(MO),methylene blue(MB) and Rhodamine B(RhB).The photodegradation rate of g-C_(3) N_(4)/Gd-0.05 composites is 72.4% for MO,95.5% for RhB,100% for MB after120 min under visible light(λ> 420 nm) irradiation.Narrow band gap promotes the separation of photogenerated electron and hole,which enhances the photocatalytic activity of g-C_(3) N_(4).It is noted that g-C_(3) N_(4)/Gd-0.05 exhibits excellent photocatalytic stability by the photocurrent and the cyclic photodegradation of MO.
