摘要
采用γ-Al2O3作为催化臭氧化催化剂,以偶氮染料橙黄G模拟废水为目标物,分析了γ-Al2O3和臭氧之间的协同作用,考察了催化剂粒径、pH、臭氧浓度等对橙黄G去除率的影响规律;通过添加叔丁醇和紫外-可见吸收光谱法,初步探讨了催化臭氧化处理橙黄G反应机理。结果表明:与单一臭氧降解和单一γ-Al2O3吸附体系相比,O3/γ-Al2O3体系能显著提高色度及COD去除率,体现出良好的协同作用;1000 mg/L的橙黄G模拟废水经120 min反应其色度去除率可达99.9%,COD去除率可以达到76.1%;投加羟基抑制剂叔丁醇,分析得出γ-Al2O3催化臭氧降解橙黄G是臭氧直接作用和羟基自由基共同作用引起的。
Study on the degradation of azo dye orange G by catalytic ozonation with γ-Al2O3and ozone was carried out in this paper. The influences of catalyst particle size,initial pH and ozone concentration on the removal efficiency of orange G were investigated. Furthermore,the synergistic effect between γ-Al2O3and O3was employed. Reaction mechanism of orange G degradation by catalytic oxidation were preliminary studied,which by the addition of tert-butyl alcohol and UV-VIS absorption spectrum. The results showed that compared with ozonation and γ-Al2O3alone,the integrated process by O3/ γ-Al2O3could improve obviously the removal of chroma and COD with a good synergistic effect. The removal efficiency of orange G( 1000 mg / L) was of 99. 9% and the COD removal efficiency was of 76. 1% after 120 min reaction. Both hydroxyl radical and O3 played a role in the degradation process of orange G by the addition of tert-butyl alcohol by O3/ γ-Al2O3.
出处
《环境工程》
CAS
CSCD
北大核心
2014年第4期41-45,共5页
Environmental Engineering
基金
国家科技支撑计划项目(2011BAC11B05)
