摘要
采用微波辅助溶胶凝胶法制备海泡石/TiO2复合催化剂,并用X射线荧光光谱仪、激光粒度仪、X射线衍射仪对海泡石/TiO2复合催化剂进行表征,研究了微波功率、微波处理温度及时间对海泡石/TiO2复合催化剂光催化降解乙酰甲胺磷效果的影响。结果表明:海泡石可有效负载TiO2;海泡石/TiO2复合催化剂中同时含有锐钛矿相和金红石相的TiO2;当微波功率为400W,微波处理温度为30℃,处理20min时,制得的海泡石/TiO2复合催化剂对乙酰甲胺磷具有较好的光催化降解效果。
This study is focused on the structural and photocatalytic properties of TiO2 supported on the sepiolite.As is known,TiO2 photocatalyst supported on the sepiolite is a synthesis gained by way of the microwave-assisted sol-gel method.In this paper,we have investigated the effects of the microwave power,the preparation temperature and the time length on the photocatalytic degradation efficiency of sepiolite / TiO2 composite catalyst,which can be determinated by the phosphomolybdenum blue spectrophotometric method.In addition,we have also engaged in examination of the structural features of the catalysts by using the X-ray fluorescence,the laser particle-size analyzer and the X-ray diffraction（XRD）.The size of laser particle analysis helps us to gain the information on the crystalline size of TiO2 nanoparticles.Our study let us know that the particle size of sepiolite / TiO2 composite catalyst turns to be much bigger than that of the TiO2 particles,whereas the sepiolite / TiO2 composite catalyst is not a simple mixture of sepiolite and TiO2.The X-ray diffraction（XRD） analysis also helps us make clear that the above said catalyst contains both anatase and rutile phase TiO2.At the same time,the X-ray fluorescence analysis demonstrates that the TiO2 content of the sepiolite / TiO2 composite catalyst is only 22.6%,as compared with that of only 0.05% before loading.As to the photocatalytic efficiency of the supported catalyst,it has been made known by using acephate as a model compound under the following conditions,i.e.the initial acephate concentration should be 10 mg/L,while the sepiolite / TiO2 concentration should be 1 g/L,with the initial pH value at 3,and the reaction solution at 20 ℃ for 30 min.And,finally,the photocatalytic degradation efficiency of sepiolite/TiO2 composite catalyst turned to be noticeably affected by the microwave preparation conditions.And the efficiency can be relatively improved under the conditions with the microwave power of 400 W,the temperature of 30 °C and time of 20 min.Thus,it can be seen that the study results of this paper can seve as a reference for further research of acephate photo-catalytic degradation by sepiolite / TiO2 composite catalyst.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2013年第4期59-63,共5页
Journal of Safety and Environment
基金
上海市自然科学基金项目(10ZR1420700)
上海市研究生创新基金项目(JWCXSL1102)
关键词
环境科学技术其他学科
光催化
微波
海泡石
TiO2复合催化剂
乙酰甲胺磷
other subjects of environmental science and technology
photocatalysis
microwave
sepiolite/TiO2 composite catalyst
acephate
