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| 1 | Coupling system application in photocatalytic degradation of methylorange by TiO_2, TiO_2/SiO_2 and TiO_2/SiO_2/Ag显示文摘Three different photocatalysts including TiO_2,TiO_2/SiO_2 and TiO_2/SiO_2/Ag were synthesized via sol-gel growth method,in which colloidal silica was used as Si source,titanium tetra iso-propoxide(TTiP) as titanium source,Ag^+ as dopant ion and hydroxypropyl cellulose(HPC) as dispersant.The purpose was to study the enhancement of photocatalytic activity of TiO_2 by deposition on SiO_2 colloids and also doping with Ag ion.The catalysts were characterized using X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray fluorescence(XRF),Fourier transform infrared spectroscopy(FT-IR)and Brunauer-Emmett-Teller(BET) methods.It is confirmed that the major phase in all catalysts is anatase.Photocatalytic activity was studied in various conditions for degradation of methylorange(as a model pollutant) to evaluate the effect of some parameters on degradation efficiency.Studying the degradation process in various pH values reveals that the degradation is more efficient in acidic solution than alkaline condition.Coupling the photocatalytic process with some fields called electro-photochemical(EP),magnetic-photochemical(MP) and ultrasonic-photochemical(UP) was studied at two pH values which were compared with photochemical(P) alone.It is concluded that in most cases,the EP is the best coupled system and has the maximum efficiency.Liquid chromatography-mass spectrometry(LC-MS)analysis was used to check the complete decomposition of methylorange at the end of process. | Hossein Ghasemi Mobtaker Seyed Javad Ahmadi Shahram Moradi Dehaghi Taher Yousefi | 2015 | Rare Metals2015，34，12： | 3 |
| 2 | TiO_2诱导下左旋氧氟沙星的可见光降解及其机制显示文摘左旋氧氟沙星是一种新型污染物.单一的左旋氧氟沙星(LFV)和Ti O2无可见光响应,但二者共存下左旋氧氟沙星能发生显著的可见光降解.为此研究Ti O2用量、溶液p H以及左旋氧氟沙星浓度对Ti O2/Vis(可见光)降解左旋氧氟沙星的影响及机制.结果表明,左旋氧氟沙星能吸附在Ti O2表面,吸附服从准二级吸附动力学和Langmuir吸附等温线.吸附左旋氧氟沙星的Ti O2漫反射UV-Vis光谱进一步表明二者形成表面复合物.左旋氧氟沙星的Ti O2/Vis降解动力学符合LangmuirHinshelwood方程.合适的Ti O2浓度和中性p H有利于光解过程的进行.自由抑制实验、N2保护下左旋氧氟沙星的Ti O2/Vis降解实验揭示·O-2是该过程中的主要活性物种.同时,无氧左旋氧氟沙星-Ti O2悬浮液光照不同时间的UV-Vis光谱证明体系中存在电子向Ti O2导带的注入.依据实验结果提出吸附在Ti O2表面的左旋氧氟沙星与Ti O2形成表面复合物,在可见光照下发生电子迁移,从而引发左旋氧氟沙星降解.本研究表明利用污染与Ti O2形成表面复合物诱导其可见光降解可用来去除水中某些有机污染物. | 郭宏生 刘亚楠 乔琪 魏红 董呈幸 薛洁 李克斌 | 2015 | 环境科学2015，36，5： | 2 |
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