纳米氧化锌的制备及其对对硝基氯苯的降解

Preparation of Nanometer Zinc Oxide and Its Application in p-Nitrochlorobenzene Degradation

采用蒸发氧化法制备纳米ZnO。当炉温为1 100℃、空气流量为0.6 m3/h、锌粒加入量为5 g时,得到高纯度类四锥体和柱形纳米ZnO。以该ZnO为光催化剂,对对硝基氯苯进行光催化氧化,考察了ZnO的加入量、对硝基氯苯的初始浓度、溶液pH等对对硝基氯苯降解率的影响。在ZnO质量浓度为0.5 g/L、对硝基氯苯质量浓度为30 mg/L、pH为7、光照时间为100 m in的条件下,对硝基氯苯降解率为98%。

Nanometer ZnO powder was prepared by evaporation-oxidation method.When the oven temperature was 1 100 ℃,air flow rate was 0.6 m^3/h and the amount of Zn was 5 g,nanometer ZnO powder of high purity and tetrapod-like shape was obtained.With this ZnO as catalyst,p-nitrochlorbenzene(p-NCB) was photocatalyticly oxidized.The effects of the dosage of ZnO,the initial concentration of 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 ZnO and p-NCB is 0.5 g/L and 30 mg/L respectively,the pH is 7 and the irradiation time is 100 min.