A series of functional organic-metal AgCl-decorated graphitic carbon nitride(AgCl-CNx)composites were synthesized and applied for the degradation of oxalic acid(OA)under visible light.The highest photocatalytic activi...A series of functional organic-metal AgCl-decorated graphitic carbon nitride(AgCl-CNx)composites were synthesized and applied for the degradation of oxalic acid(OA)under visible light.The highest photocatalytic activity was achieved with AgCl decoration ratio of1.0(denoted as AgCl-CN1.0).The pseudo-first-order constant for OA degradation was 0.0722min-1 with the mineralization efficiency of 90.80%after 60 min reaction in the photocatalytic process with AgCl-CN1.0.A variety of characterization techniques including BrunauerEmmett-Teller,X-ray diffraction,scanning electron microscope,transmission electron microscopy,X-ray photoelectron spectroscopy,Fourier transform infrared spectra,ultraviolet-visible diffuse reflectance spectra,photoluminescence,and Mott-Schottky were utilized to elucidate the physicochemical,microstructure,and optical properties contributing to the improvement of the photocatalytic performance.The results showed that AgClCN1.0had an oblate flaky erythrocyte-like structure with a moderate band gap energy of^3.00 eV.In addition,the effects of the key parameters(i.e.,AgCl-CN1.0 dosage,initial OA concentration,solution pH,and presence of natural organic matter)on OA degradation were systematically investigated.Radical scavenger experiments indicated that photogenerated holes,electrons,superoxide anion radicals,and hydroxyl radicals were the dominant reactive species.Moreover,AgCl-CN1.0 exhibited excellent stability and reusability for OA degradation without detectable Ag+release in the solution over multiple reaction cycles.The efficient OA mineralization could be mainly ascribed to the moderate specific surface area,increased numbers of active sites,and effective interfacial charge transfer of AgCl-CN1.0.Overall,the AgCl-CN1.0 composite was demonstrated to be a highly efficient,stable,and recoverable photocatalyst.展开更多
基金supported by the National Natural Science Foundation of China (No. 51808412)the Natural Science Foundation of Hubei province (Nos. 2017CFA026 and 2018CFB266)+1 种基金the Central Government Guidance for Local Science and Technology Development Projects for Hubei province (No. 2018ZYYD024)the Science and Technology Project of Educational Commission of Hubei province (No. Q20181706)
文摘A series of functional organic-metal AgCl-decorated graphitic carbon nitride(AgCl-CNx)composites were synthesized and applied for the degradation of oxalic acid(OA)under visible light.The highest photocatalytic activity was achieved with AgCl decoration ratio of1.0(denoted as AgCl-CN1.0).The pseudo-first-order constant for OA degradation was 0.0722min-1 with the mineralization efficiency of 90.80%after 60 min reaction in the photocatalytic process with AgCl-CN1.0.A variety of characterization techniques including BrunauerEmmett-Teller,X-ray diffraction,scanning electron microscope,transmission electron microscopy,X-ray photoelectron spectroscopy,Fourier transform infrared spectra,ultraviolet-visible diffuse reflectance spectra,photoluminescence,and Mott-Schottky were utilized to elucidate the physicochemical,microstructure,and optical properties contributing to the improvement of the photocatalytic performance.The results showed that AgClCN1.0had an oblate flaky erythrocyte-like structure with a moderate band gap energy of^3.00 eV.In addition,the effects of the key parameters(i.e.,AgCl-CN1.0 dosage,initial OA concentration,solution pH,and presence of natural organic matter)on OA degradation were systematically investigated.Radical scavenger experiments indicated that photogenerated holes,electrons,superoxide anion radicals,and hydroxyl radicals were the dominant reactive species.Moreover,AgCl-CN1.0 exhibited excellent stability and reusability for OA degradation without detectable Ag+release in the solution over multiple reaction cycles.The efficient OA mineralization could be mainly ascribed to the moderate specific surface area,increased numbers of active sites,and effective interfacial charge transfer of AgCl-CN1.0.Overall,the AgCl-CN1.0 composite was demonstrated to be a highly efficient,stable,and recoverable photocatalyst.
