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以十六烷基三甲基溴化铵(CTAB)表面活性剂和钛酸四丁酯分别为造孔模板和钛源,通过超声辅助溶剂挥发自组装技术制备有序介孔氧化钛(ordered mesoporous Ti O2,OMPT)及其活性炭负载体(ordered mesoporous Ti O2/AC,OMPTA).为探讨OMPTA结构与性能之间的关系,采用超声辅助溶胶-凝胶技术合成了无孔氧化钛/活性炭(nonporous Ti O2/AC,NPTA)负载体,利用热重-差热(TG-DTA)、X射线衍射(XRD)、氮气吸附-解吸、透射电子显微镜(TEM)和紫外漫反射(DRS)等手段对制备材料结构进行表征.以酸性红B(acid red B,ARB)的光催化降解为探针实验,评价OMPTA的光催化性能和使用寿命,提出了孔-孔协同光催化扩增机制,并探讨了催化条件(染料浓度、催化剂浓度和溶液p H)对协同扩增效果的影响.结果表明:相对于纯OMPT,OMPTA具有晶粒生长的高活化能、较小的粒径尺寸和对有序介孔结构的高热稳定性,这归功于活性炭的吸附力和非晶相层对晶粒生长的阻碍作用.由于孔-孔协同光催化扩增效应,导致OMPTA在NPTA、OMPT-AC、OMPT、P25和NPT中具有更高的催化活性.热处理温度强烈影响OMPTA的光催化活性,其中OMPTA-500具有最高的光催化活性,这归功于其具备完善的结晶性、相对高浓度的羟基和Ti3+离子.同时,OMPTA-500在重复使用过程中也具有很高的光催化性能.当使用OMPTA-500为催化剂对ARB降解时,最佳的催化条件为催化剂浓度1 g/L,ARB浓度15 mg/L,p H 5.
Cetyltrimethylammonium bromide (CTAB) surfactant and tetrabutyl titanate were used as pore-forming template and titanium source respectively, ordered mesoporous titanium oxide was prepared by ultrasonic assisted solvent evaporation self-assembly technique Ti O2, OMPT and ordered mesoporous Ti O2 / AC, OMPTA. In order to investigate the relationship between the structure and properties of OMPTA, nonporous titanium oxide / activated carbon was synthesized by ultrasonic assisted sol- Ti O2 / AC, NPTA) was prepared and characterized by means of TG-DTA, XRD, N2 adsorption-desorption, transmission electron microscopy (TEM) and ultraviolet diffuse reflectance spectroscopy (DRS) Preparation of material structure for characterization.Using photocatalytic degradation of acid red B (ARB) as a probe to evaluate the photocatalytic performance and service life of OMPTA, a pore-pore synergistic photocatalytic amplification mechanism was proposed and discussed The effects of catalytic conditions (dye concentration, catalyst concentration and solution pH) on the synergistic effect were investigated. The results show that OMPTA has the advantages of high activation energy of grain growth, smaller particle size, The high thermal stability of the mesoporous structure is attributed to the adsorption of activated carbon And amorphous layer on the growth of the grain.The OMPTA has higher catalytic activity in NPTA, OMPT-AC, OMPT, P25 and NPT due to pore-hole synergistic effect of photocatalytic amplification.The temperature of heat treatment strongly affected OMPTA photocatalytic activity, which OMPTA-500 has the highest photocatalytic activity, thanks to its perfect crystalline, relatively high concentrations of hydroxyl and Ti3 + ions. At the same time, OMPTA-500 in the repeated use of the process also has a high When the ARB was degraded by using OMPTA-500 as catalyst, the best catalytic conditions were as follows: catalyst concentration 1 g / L, ARB concentration 15 mg / L, p H 5.