In this study,the enhancement of catalytic activity of ceria when modified with co-catalysts such as graphitic carbon nitride and silver was establishe d.The material was synthe sized using phytogenic combustion metho...In this study,the enhancement of catalytic activity of ceria when modified with co-catalysts such as graphitic carbon nitride and silver was establishe d.The material was synthe sized using phytogenic combustion method,a green alternative to the traditional preparative routes.The catalyst was characterized using XRD,FTIR,SEM,EDX,XPS and TEM techniques.The synergistic effect of the composite CeO2/g-C3 N4/Ag was tested for catalytic reduction of 4-nitrophenol in the prese nce of sodium borohydride.The reaction was carried out at room tempe rature without any light source or exte rnal stirring.The individual and combined effects of four parameters,viz.,concentration of 4-NP,amount of catalyst,amount of NaBH4 and time for the reduction of reduction 4-NP were investigated using Box-Behnken design of response surface methodology(RSM).This statistical model was used to optimize the reaction conditions for maximum reduction of 4-NP.The optimum conditions for the reduction reaction are found to be 0.01 mmol/L 4-NP,15 mg catalyst,20 mg NaBH4 and 13.7 min time interval.展开更多
The low surface area,high recombination rate of photogenerated charge carriers,narrow visible range activity,and difficulty in the separation from cleaned solutions limit the wide application of g-C_(3)N_(4) as a phot...The low surface area,high recombination rate of photogenerated charge carriers,narrow visible range activity,and difficulty in the separation from cleaned solutions limit the wide application of g-C_(3)N_(4) as a photocatalyst.Herein,we have succeeded in developing a one-pot strategy to overcome the above-mentioned difficulties of g-C_(3)N_(4).The broadening of the visible-light response range and inducing magnetic nature to g-C_(3)N_(4) was succeeded by preparing a nanocomposite with Fe_(2)O_(3) via a facile solvothermal method.The preparation method additionally imparted layer exfoliation of g-C_(3)N_(4) as evident from the XRD patterns and TEM images.The strong interaction between the components is revealed from the XPS analysis.The broadened visible-light absorbance of Fe_(2)O_(3)/g-C_(3)N_(4) with a Z-scheme photocatalytic degradation mechanism is well evident from the UV-Vis DRS analysis and PL measurement of the composite with terephthalic acid.The active species of photocatalysis were further investigated using scavenging studies in methylene blue degradation that revealed hydroxyl radicals and holes as the major contributors to the activity of Fe_(2)O_(3)/g-C_(3)N_(4).展开更多
文摘In this study,the enhancement of catalytic activity of ceria when modified with co-catalysts such as graphitic carbon nitride and silver was establishe d.The material was synthe sized using phytogenic combustion method,a green alternative to the traditional preparative routes.The catalyst was characterized using XRD,FTIR,SEM,EDX,XPS and TEM techniques.The synergistic effect of the composite CeO2/g-C3 N4/Ag was tested for catalytic reduction of 4-nitrophenol in the prese nce of sodium borohydride.The reaction was carried out at room tempe rature without any light source or exte rnal stirring.The individual and combined effects of four parameters,viz.,concentration of 4-NP,amount of catalyst,amount of NaBH4 and time for the reduction of reduction 4-NP were investigated using Box-Behnken design of response surface methodology(RSM).This statistical model was used to optimize the reaction conditions for maximum reduction of 4-NP.The optimum conditions for the reduction reaction are found to be 0.01 mmol/L 4-NP,15 mg catalyst,20 mg NaBH4 and 13.7 min time interval.
文摘The low surface area,high recombination rate of photogenerated charge carriers,narrow visible range activity,and difficulty in the separation from cleaned solutions limit the wide application of g-C_(3)N_(4) as a photocatalyst.Herein,we have succeeded in developing a one-pot strategy to overcome the above-mentioned difficulties of g-C_(3)N_(4).The broadening of the visible-light response range and inducing magnetic nature to g-C_(3)N_(4) was succeeded by preparing a nanocomposite with Fe_(2)O_(3) via a facile solvothermal method.The preparation method additionally imparted layer exfoliation of g-C_(3)N_(4) as evident from the XRD patterns and TEM images.The strong interaction between the components is revealed from the XPS analysis.The broadened visible-light absorbance of Fe_(2)O_(3)/g-C_(3)N_(4) with a Z-scheme photocatalytic degradation mechanism is well evident from the UV-Vis DRS analysis and PL measurement of the composite with terephthalic acid.The active species of photocatalysis were further investigated using scavenging studies in methylene blue degradation that revealed hydroxyl radicals and holes as the major contributors to the activity of Fe_(2)O_(3)/g-C_(3)N_(4).
