纳米二氧化锆的制备及其对对硝基氯苯的降解

Preparation of Nanometer Zirconium Oxide and its Application in p-Nitrochlorobenzene Degradation

用流变相反应法合成前驱物苯甲酸氧锆,通过元素分析,红外光谱,差热分析(DTA)和热重分析(TG)确定了前驱物的组成为ZrO(C6H5COO)2.2H2O.苯甲酸氧锆在氮气气氛下于700℃分解1.5 h得到高纯度纳米二氧化锆,属六方晶系呈球形,平均粒径约为20 nm.以该ZrO2为光催化剂,对对硝基氯苯进行光催化氧化,考察了ZrO2的加入量、对硝基氯苯的起始浓度、溶液pH值等对对硝基氯苯降解率的影响.在ZrO2加入量为0.75 g.L-1、对硝基氯苯起始质量浓度为30 mg.L-1、溶液pH值为7、光照时间为90 m in的条件下,对硝基氯苯的降解率为98%.

Zirconium oxybenzoate precursor was obtained with the rheological phase reaction. Characterization resuits of element analysis, IR, TG and DTA indicate the precursor is ZrO（C6H5COO）2 · 2H2O. After heating 1.5 hours at 700 ℃ in nitrogen atmosphere the precursor decomposed into nanometer ZrO2 of high purity, The ZrO2 crystallines have hexagonal structure with spherical mophology and an average size of 20 nm. With this ZrO2 as catalyst, p- NCB and the pH of the solution on the degradation of p- NCB were tested. The degradation rate of p- NCB is 98% when the mass concentration of ZrO2 and p- NCB is 0. 75 g/L and 30 mg/L respectively, the pH is 7 and the irradiation time is 90 min.