纳米氧化铜的制备及光催化降解亚甲基蓝

Preparation of Nanometer Copper Oxide and Its Photocatalytic Degradation Property of Methylene Blue

近年来,印染废水造成环境污染的问题日益严重。为处理印染废水,以亚甲基蓝(MB)为目标降解物,采用化学沉淀法制备出了纤维状和球状两种形貌的纳米氧化铜,利用XRD和SEM对样品进行表征。当催化剂投加量0.1 g、初始pH=9、亚甲基蓝初始浓度5 mg/L、质量分数为30%的H_(2)O_(2)滴加量1 mL、紫外光下反应75 min时,亚甲基蓝溶液降解率最高,且催化剂循环使用3次后,亚甲基蓝的降解率仍在88%以上,具有优良的稳定性。纳米氧化铜的形貌相同时,晶粒尺寸越小,对亚甲基蓝催化降解效果越好。相同条件下,球状纳米氧化铜催化降解亚甲基蓝的能力强于纤维状纳米氧化铜。

In recent years,the problem of environmental pollution caused by printing and dyeing wastewater has become increasingly serious.In order to deal with the printing and dyeing wastewater,methylene blue(MB)was used as the target degradation product,and nanometer copper oxides with fibrous and spherical morphologies were prepared by chemical precipitation and characterized by XRD and SEM.When catalyst dosage is 0.1 g,initial pH value is 9,initial methylene blue concentration is 5 mg/L,amount of H_(2)O_(2) with mass fraction of 30%is 1 mL,the methylene blue solution has the highest degradation rate under ultraviolet light for 75 min.The degradation rate is still above 88%after methylene blue solution is recycled for three times,which showing excellent stability.When the morphology of nano-copper oxide is the same,the smaller the grain size of the sample,the better the catalytic degradation effect of methylene blue.Under the same experimental conditions,the catalytic degradation of methylene blue by spherical nanometer copper oxide is stronger than that by fibrous copper oxide nanoparticles.