摘要
采用 5 0kHz超声降解偶氮染料酸性红B(ARB) ,考察了溶液 pH和Fe(Ⅱ )浓度对ARB声化学降解过程的影响 .结果表明 ,酸性条件有利于ARB的脱色过程 .超声过程中H2 O2 的浓度随时间线性增加 .Fe(Ⅱ )和H2 O2 反应生成·OH ,强化了ARB的声化学脱色速率和降解过程 .当Fe(Ⅱ )浓度为 1 4 3mg/L和 2 85mg/L时 ,ARB的脱色速率 (在 5 1 5nm处 )分别提高了1 1 7倍和 1 75倍 .同时 ,ARB在 32 2nm和 2 5
Sonochemical degradation of azo dye Acid Red B (ARB) was studied in this paper. The effect of pH and ferrous ion concentrations on the process was investigated. The results show that decolorization of ARB proceeds faster in acidic medium. The production of H 2O 2 is proportional to sonication time. The presence of Fe(Ⅱ), which could react with H 2O 2 to produce ·OH, enhances the sonochemical decolorizatio and degradation of the dye. The decolorization rates of ARB are 2 17 and 2 75 times faster, respectively, when Fe(Ⅱ) concentrations are 1 43 mg/L and 2 85 mg/L. The UV absorptions at 322 nm and 254 nm also reduce ARB dramatically.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第4期90-93,共4页
Environmental Science
基金
国家杰出青年科学基金资助项目 ( 5 0 2 2 5 82 4)
王宽诚博士后奖励基金项目
