摘要
本文以粒状活性炭为载体,冰醋酸(HAc)为修饰剂,用溶胶-凝胶法制备负载TiO_2催化剂,以亚甲蓝为研究对象,确定溶胶-凝胶法制备负载TiO_2催化剂的最佳工艺条件:钛酸丁酯:乙醇:水:冰醋酸=1:4:0.13:0.1(体积比)。
用XRD、FT-IR、比表面积、亚甲蓝吸附值、催化剂表面的二氧化钛负载量、使用寿命等对催化剂及载体的性能进行了表征,以亚甲蓝水溶液为对象,研究了负载TiO_2催化剂的催化性能。
探讨在负载工艺中加入冰醋酸和聚乙二醇(PEG)为修饰剂制备负载催化剂,并用XRD、FT-IR、比表面积、亚甲蓝吸附值、催化剂表面的二氧化钛负载量对其进行表征,结果表明由此制得的催化剂有较好的分散度,亚甲蓝吸附值、二氧化钛负载量和光催化活性。
采用自制负载TiO_2催化剂,研究了在250W高压汞灯照射下,几种萘系化合物废水的光催化降解行为,试验了光催化降解条件和控制因素,研究结果表明:
(1) 萘系化合物水溶液的初始浓度对其降解率有影响,随着初始浓度的增加,光催化降解率下降明显,扣除吸附后,In(C_0/C_t)~t基本符合线性关系即光催化降解反应是一级动力学反应。
(2) 萘系化合物水溶液光催化降解时,pH值对降解率的影响与萘系化合物的种类有关。
(3) 在起始溶液中加入双氧水可明显提高降解效果。
TiO2 catalyst was desposited on granular activated carbon modified with acetic acid by sol-gel method. The optimum process condition of the preparation of the catalyst was determined with methylene blue as experimental object. The ratio of volume was 1 : 4 : 0.13 : 0.1 (butyl titanate, ethanol,liquid and acetic acid).
TiO2 catalyst supported on granular activated carbon was characterized by XRD, SEM,FT-IR,BET,adsorption value of methylene blue,quanity of titania and photocatalytic activity on methylene blue.
The preparation of TiO2 catalyst modified with acetic acid and poly ethylene glycol was discussed in this paper, characterized by XRD, SEM, FT-IR, BET, adsorption value of methylene blue,quanity of titania.The results show that pore-size distribution, adsorption value of methylene blue,quanity of titania and photocatalytic activity were higher than of modification by acetic acid.
Photocatalytic degradation of naphthalene compounds in water were studied by TiO2 catalyst supported on granular activated carbon under irradiation of 250W mercury lamp of high pressure. The condition of photocatalytic degradation and manipulative factors were studied in this paper.
The results of photocatalytic degradation of naphthalene compound were as follows:
(1)The degradation ratio of naphthalene compounds was greatly affected by initial concentration. While initial concentration increased, the degradation ratio decreased in evidence. The reaction of photocatalytic degradation accorded with one-step dynamics kinetics deducting adsorption.
(2)pH value of solution influenced differently on the degradation ratio for the species of naphthalene compound.
(3)When hydrogen peroxide existed in initial solution, the degradation efficiency can improve in evidence.
引文
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