Effect of inorganic additives on the removal of Methylene Blue in heterogeneous Fenton system
非均相Fenton体系中无机助剂对亚甲基蓝脱色的影响

The discoloration of Methylene Blue(MB) using a ferrocene/Fenton system was studied. A series of experiments were performed to analyze the effect of several typical inorganic additives, including CuSO4, NaCl, Na2CO3, Na2SO4 and Na2S. The results revealed that under the optical conditions, residual MB in solution of 0.6% could be achieved in 120 min, and the generation efficiency of hydroxyl radicals was 99.8%. ·OH generated in solution were quenched by SO42-, Cl-, CO32- and consumed by S2-. Thus, addition of NaCl, Na2CO3, Na2SO4 and Na2S resisted the degradation of MB. Because of the other Fenton-like system composed of Cu2+ and H2O2 could generate extra ·OH, addition of CuSO4 accelerated the degradation of MB.