We synthesized NiO-loaded TiO2porous p-n junctions by electrophoretic enhanced micro arc oxidation（EEMAO） technique which is a relatively simple and new method for producing composite coatings.Phase structure,chemic...We synthesized NiO-loaded TiO2porous p-n junctions by electrophoretic enhanced micro arc oxidation（EEMAO） technique which is a relatively simple and new method for producing composite coatings.Phase structure,chemical composition,and surface morphology of the NiO—TiO2coatings were investigated by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,and scanning electron microscopy（SEM） techniques,respectively.Photocatalytic efficiency of the samples was studied through measuring the decomposition rate of 4-chlorophenol under UV irradiation.Results showed that the coatings mainly consisted of anatase,rutile,and nickel oxide phases.It was observed that a finer surface morphology,i.e.smaller pores,was obtained at lower voltages.Besides,the amount of nickel oxide loaded to the TiO2host increased with the voltage.The NiO-TiO2composite coatings showed a higher photoactivity than pure TiO2coatings revealing the effective role of NiO in decreasing the recombination rate of photogenerated electrons and holes.The maximum photocatalytic reaction rate constants for TiO2and NiO—TiO2samples were obtained as 0.0064 and 0.0131 min-1,respectively.We also found that there was an optimum concentration of NiO where a maximum photocatalytic activity was achieved.A correlation between growth variables,structure,and photocatalytic efficiency was established.展开更多
A series of Z-schemeβ-Bi_(2)O_(3)/ZrO_(2)hetero-junction composites containing three-dimensional(3D)mesoporous silica nanospheres(MSNs)were synthesized as efficient catalysts for antibiotic remediation.The obtained M...A series of Z-schemeβ-Bi_(2)O_(3)/ZrO_(2)hetero-junction composites containing three-dimensional(3D)mesoporous silica nanospheres(MSNs)were synthesized as efficient catalysts for antibiotic remediation.The obtained MSN/β-Bi_(2)O_(3)/ZrO_(2)ternary composites possess novel lamellar cross structure,which is well constructed byβ-Bi_(2)O_(3)nanosheets,3D MSNs,and ZrO_(2)nanoparticles.The optimal sample BZS-2(Bi∶Zr∶Si=1∶0.4∶0.33)shows an adsorptive-photocatalytic removal efficiency of 92.7%towards levofloxacin(LVF)and a total organic carbon(TOC)removal efficiency of 60.0%under simu-lated solar light irradiation for 100 min.BZS-2 can also remove 90.1%and 91.2%of tetracycline hydrochloride(TC)and oxytetracycline hydrochloride(OTC),respectively,and themaximum adsorptioncapacityof TCover BZS-2is almost 10 times that of-BiO.Theimprovement ofphotocatalytic activitycan bemainly attributed to the enhanced visible-light adsorption capacity and more efficientseparationof photogenerated electron-hole pairs.A possible Z-scheme photocatalytic mechanism of p BiO/ZrOheterojunctions based on valence band offset(AEvBo)andconduction band offset(EcBo)isproposed.This study provides an efficient way to construct novel mesoporous ternary photocatalyst with increased accessible surface area and active sites for treatment of antibiotics by synergistic adsorption and photocatalysis.展开更多
文摘We synthesized NiO-loaded TiO2porous p-n junctions by electrophoretic enhanced micro arc oxidation（EEMAO） technique which is a relatively simple and new method for producing composite coatings.Phase structure,chemical composition,and surface morphology of the NiO—TiO2coatings were investigated by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,and scanning electron microscopy（SEM） techniques,respectively.Photocatalytic efficiency of the samples was studied through measuring the decomposition rate of 4-chlorophenol under UV irradiation.Results showed that the coatings mainly consisted of anatase,rutile,and nickel oxide phases.It was observed that a finer surface morphology,i.e.smaller pores,was obtained at lower voltages.Besides,the amount of nickel oxide loaded to the TiO2host increased with the voltage.The NiO-TiO2composite coatings showed a higher photoactivity than pure TiO2coatings revealing the effective role of NiO in decreasing the recombination rate of photogenerated electrons and holes.The maximum photocatalytic reaction rate constants for TiO2and NiO—TiO2samples were obtained as 0.0064 and 0.0131 min-1,respectively.We also found that there was an optimum concentration of NiO where a maximum photocatalytic activity was achieved.A correlation between growth variables,structure,and photocatalytic efficiency was established.
基金financially supported by National Natural Science Foundation of China (Nos.21962006, 21607064 and 21707055)the Youth Key Project of Natural Science Foundation of Jiangxi Province (Nos.20192ACBL20014 and 20192ACBL21011)+1 种基金the Natural Science Foundation of Jiangxi Province (Nos.20181BAB203018 and 20181BAB213010)Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology
文摘A series of Z-schemeβ-Bi_(2)O_(3)/ZrO_(2)hetero-junction composites containing three-dimensional(3D)mesoporous silica nanospheres(MSNs)were synthesized as efficient catalysts for antibiotic remediation.The obtained MSN/β-Bi_(2)O_(3)/ZrO_(2)ternary composites possess novel lamellar cross structure,which is well constructed byβ-Bi_(2)O_(3)nanosheets,3D MSNs,and ZrO_(2)nanoparticles.The optimal sample BZS-2(Bi∶Zr∶Si=1∶0.4∶0.33)shows an adsorptive-photocatalytic removal efficiency of 92.7%towards levofloxacin(LVF)and a total organic carbon(TOC)removal efficiency of 60.0%under simu-lated solar light irradiation for 100 min.BZS-2 can also remove 90.1%and 91.2%of tetracycline hydrochloride(TC)and oxytetracycline hydrochloride(OTC),respectively,and themaximum adsorptioncapacityof TCover BZS-2is almost 10 times that of-BiO.Theimprovement ofphotocatalytic activitycan bemainly attributed to the enhanced visible-light adsorption capacity and more efficientseparationof photogenerated electron-hole pairs.A possible Z-scheme photocatalytic mechanism of p BiO/ZrOheterojunctions based on valence band offset(AEvBo)andconduction band offset(EcBo)isproposed.This study provides an efficient way to construct novel mesoporous ternary photocatalyst with increased accessible surface area and active sites for treatment of antibiotics by synergistic adsorption and photocatalysis.
