非均相Fenton体系中无机助剂对亚甲基蓝脱色的影响

Effect of inorganic additives on the removal of Methylene Blue in heterogeneous Fenton system

直接使用有机过渡金属化合物二茂铁作为催化剂,研究了非均相Fenton反应中亚甲基蓝的降解,并考虑了实际排放的印染废水中存在的无机助剂,进一步分析了典型无机助剂CuSO4、NaCl、Na2CO3、Na2SO4、Na2S的存在对该非均相Fenton体系的影响,结果表明:直接使用二茂铁做催化剂反应120 min后,亚甲基蓝的剩余率为0.6%,羟基自由基的表观生成率为83.4%。NaCl、Na2CO3、Na2SO4、Na2S的加入会阻碍反应的进行,而CuSO4的加入会促进反应的进行。

The discoloration of Methylene Blue（MB） using a ferrocene/Fenton system was studied. A se- ries of experiments were performed to analyze the effect of several typical inorganic additives, including CuSO4 , NaC1, Na2CO3, Na2SO4 and Na2S. The results revealed that under the optical conditions, residual MB in solu- tion of O. 6% could be achieved in 120 min, and the generation efficiency of hydroxyl radicals was 99.8%. · OH generated in solution were quenched by SO4^2-, Cl-, CO3^2- and consumed by S2-. Thus, addition of NaCl, Na2CO3, Na2SO4 and Na2S resisted the degradation of MB. Because of the other Fenton-like system com- posed of Cu^2＋ and H2O2 could generate extra · OH, addition of CuSO4 accelerated the degradation of MB.