负载CuO/MnO海泡石中性条件催化H_2O_2处理铝材切削液废水

TREATING ALUMINUM CUTTING FLUID WASTEWATER WITH H_2O_2 CATALYZED BY SEPIOLITE SUPPORTED CuO/MnO IN NEUTRAL CONDITION

以改性海泡石为载体,采用浸渍-共沉淀法负载Cu0、MnO制备了中性条件下催化H_2O_2氧化催化剂(简称中性催化剂)。以铝材切削液废水为处理对象,研究了催化剂在中性条件下的催化性能,通过投加不同浓度的羟基自由基捕捉剂叔丁醇,对反应机理进行了探讨,同时研究了过氧化氢用量、催化剂用量等因素对废水COD去除率的影响。结果表明:在中性条件下,催化剂对铝材切削液废水具有较高的COD去除率,当过氧化氢用量为1.25 mol/L,催化剂用量为25 g/L,室温条件反应120 min时,COD去除率达到88%;经该方法处理后,废水ρ(BOD5)/ρ(COD)由处理前的0.09提升到处理后的0.36,可生化性得到了明显提高。

A neutral oxidation catalyst was synthesized through impregnation-coprecipitation method by utilizing Cu O and Mn O as the active ingredient,and modified sepiolite as the carrier. And the treatment for metal cutting fluid wastewater and the catalytic properties of this catalyst under neutral condition was investigated. Different concentrations of tert-butanol were added to investigate the reaction mechanism by capturing hydroxyl radical. The effects of the amount of H2O2 and catalyst on the removal of COD were studied. The results indicated that the metal cutting fluid wastewater could be effectively removed within this synthesized catalyst. Also the removal rate of COD reached 88% in neutral condition when the amount of H2O2 and catalyst were 1. 25 mol / L and 25 g / L,respectively,within 120 min reaction at room temperature. And BOD5/ COD was increased from 0. 09 to 0. 36,indicating that the wastewater biodegradation had been significant improved by using this synthesized catalyst.