磷酸银光催化性能的研究
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摘要
以亚甲基蓝为降解物,在模拟可见光照射下比较Ag_3PO_4和TiO_2的光催化性能,探究Ag_3PO_4在不同pH、波长、催化剂用量和亚甲基蓝浓度下的光催化活性,并利用TOC分析降解的矿化效果。利用X射线衍射仪(XRD)、激光拉曼光谱仪(RRS)、傅里叶变换红外光谱仪(FT-IR)分析磷酸银样品的晶相组成。结果表明,在同等条件下Ag_3PO_4光催化活性远高于TiO_2。而Ag_3PO_4在中碱性环境、光照波长不大于535 nm、催化剂用量较大、亚甲基蓝溶液浓度不大于50mg/L这些条件下能有效降解亚甲基蓝。
The photocatalytic properties of Ag_3PO_4 and TiO_2 were compared under simulated visible light irradiation with methylene blue as a degradant. And the effects of Ag_3PO_4 on photocatalytic activity under different p H,wavelength,catalyst dosage and methylene blue concentration were investigated. TOC was used to characterize the degree of methylene blue mineralization and test whether methylene blue was actually degraded. The crystal phase composition of silver phosphate samples were analyzed by X-ray diffraction( XRD),laser Raman spectrometer( RRS) and FT-IR. The results showed that the photocatalytic activity of Ag_3PO_4 was much higher than that of TiO_2 under the same conditions.Ag_3PO_4 can effectively degrade methylene blue under conditions of medium alkaline environment,light wavelength was not greater than 535 nm with large amount of catalyst,and concentration of methylene blue solution was not greater than50 mg/L. TOC showed that the mineralization rate of methylene blue increased to 21% at 30 min. Through XRD,RRS and FT-IR analysis,it was confirmed that the prepared sample was silver phosphate with less impurities and was relatively pure.
The photocatalytic properties of Ag_3PO_4 and TiO_2 were compared under simulated visible light irradiation with methylene blue as a degradant. And the effects of Ag_3PO_4 on photocatalytic activity under different p H,wavelength,catalyst dosage and methylene blue concentration were investigated. TOC was used to characterize the degree of methylene blue mineralization and test whether methylene blue was actually degraded. The crystal phase composition of silver phosphate samples were analyzed by X-ray diffraction( XRD),laser Raman spectrometer( RRS) and FT-IR. The results showed that the photocatalytic activity of Ag_3PO_4 was much higher than that of TiO_2 under the same conditions.Ag_3PO_4 can effectively degrade methylene blue under conditions of medium alkaline environment,light wavelength was not greater than 535 nm with large amount of catalyst,and concentration of methylene blue solution was not greater than50 mg/L. TOC showed that the mineralization rate of methylene blue increased to 21% at 30 min. Through XRD,RRS and FT-IR analysis,it was confirmed that the prepared sample was silver phosphate with less impurities and was relatively pure.
引文
[1]X L Ma,H H Li,Y H Wang,et al. Substantial change in phenomenon of “self-corrosi” on Ag3PO4/Ti O2compound photocatalyst[J].Applied Catalysis B Environmental,2014,s158-159:314-320.
[2]Yi Z,Ye J,Kikugawa N,et al. An orthophosphate semiconductor with photooxidation properties under visible-light irradiation[J]. Nature Materials,2010,9(7):559-564.
[3]Fujishima A,Honda K. Photolysis-decomposition of water at the surface of an irradiated semiconductor[J]. Nature,1972,238(5385):37-38.
[4]Zhiguo Y,Jinhua Y,Naoki K,et al. An orthophosphate semiconductor with photoxidation properties under visible-light irradiation[J]. Nature materials,2010,9(7):559.
[5]陈全意. Ag3PO4复合体系光催化剂的制备及其性能研究[D].太原:太原理工大学,2017.
[6]林鹏鹏,谢婷,潘红玉,等.木质素吸附剂处理染料废水的研究[C].成都:西南交通大学地球科学与环境工程学院,2011.
[7]龙泽清,王海芳,宋慧,等. Fe掺杂纳米ZnO的制备及其光催化性能研究[J].化工新型材料,2016,44(2):195-197.
[8]毛星.碳纳米管—磷酸银光催化剂的合成及其可见光催化活性研究[D].南京:南京大学,2014.
[9]吉芳英,徐璇,范子红,等. CuO/Ti O2-H2O2光催化体系中亚甲基蓝脱色机理[J].重庆大学学报,2009,32(6):705-710.
[10]咸晓斋.磷酸银基光催化分解水复合材料的设计合成和性能研究[D].镇江:江苏大学,2017.
[11]王会琴.碳质载体负载银基半导体复合光催化材料的设计与光降解行为及机理研究[D].镇江:江苏大学,2016.
[12]Liang Q,Shi Y,Ma W,et al. Enhanced photocatalytic activity and structural stability by hybridizing Ag3PO4nanospheres with graphene oxide sheets[J]. Physical Chemistry Chemical Physics,2012,14(45):15657-15665.
[13]李军奇,郭占云,王德方,等.立方体形Ag3PO4可见光光催化剂的制备及其性能研究[J].陕西科技大学学报(自然科学版),2013,31(4):24-28,37.
[14]Xiao J,Peng T,Li R,et al. Preparation,phase transformation and photocatalytic activities of cerium-doped mesoporous titania nanoparticles[J]. Journal of Solid State Chemistry,2006,179(4):1161-1170.
[2]Yi Z,Ye J,Kikugawa N,et al. An orthophosphate semiconductor with photooxidation properties under visible-light irradiation[J]. Nature Materials,2010,9(7):559-564.
[3]Fujishima A,Honda K. Photolysis-decomposition of water at the surface of an irradiated semiconductor[J]. Nature,1972,238(5385):37-38.
[4]Zhiguo Y,Jinhua Y,Naoki K,et al. An orthophosphate semiconductor with photoxidation properties under visible-light irradiation[J]. Nature materials,2010,9(7):559.
[5]陈全意. Ag3PO4复合体系光催化剂的制备及其性能研究[D].太原:太原理工大学,2017.
[6]林鹏鹏,谢婷,潘红玉,等.木质素吸附剂处理染料废水的研究[C].成都:西南交通大学地球科学与环境工程学院,2011.
[7]龙泽清,王海芳,宋慧,等. Fe掺杂纳米ZnO的制备及其光催化性能研究[J].化工新型材料,2016,44(2):195-197.
[8]毛星.碳纳米管—磷酸银光催化剂的合成及其可见光催化活性研究[D].南京:南京大学,2014.
[9]吉芳英,徐璇,范子红,等. CuO/Ti O2-H2O2光催化体系中亚甲基蓝脱色机理[J].重庆大学学报,2009,32(6):705-710.
[10]咸晓斋.磷酸银基光催化分解水复合材料的设计合成和性能研究[D].镇江:江苏大学,2017.
[11]王会琴.碳质载体负载银基半导体复合光催化材料的设计与光降解行为及机理研究[D].镇江:江苏大学,2016.
[12]Liang Q,Shi Y,Ma W,et al. Enhanced photocatalytic activity and structural stability by hybridizing Ag3PO4nanospheres with graphene oxide sheets[J]. Physical Chemistry Chemical Physics,2012,14(45):15657-15665.
[13]李军奇,郭占云,王德方,等.立方体形Ag3PO4可见光光催化剂的制备及其性能研究[J].陕西科技大学学报(自然科学版),2013,31(4):24-28,37.
[14]Xiao J,Peng T,Li R,et al. Preparation,phase transformation and photocatalytic activities of cerium-doped mesoporous titania nanoparticles[J]. Journal of Solid State Chemistry,2006,179(4):1161-1170.