Abstract:

Amino black 10B(AB10B) is one of the typical azo dyes, with a highly stable molecular structure and characteristics such as difficult degradation and strong toxicity. By constructing the iron-copper(Fe-Cu) internal electrolysis system, based on the response surface methodology, the removal rate of AB10B was taken as the response value to analyze the interaction effects of Cu dosage, reaction time, and initial wastewater pH under the conditions of a solution volume of 250 mL, AB10B initial concentration of 40 mg/L, and iron filings dosage of 10 g. The optimal reaction conditions were obtained as initial pH of 2, copper dosage of 1.34 g, reaction time of 120 min. Under these conditions, the removal rate of AB10B reached 95.97%. The mechanism of AB10B degradation in Fe-Cu system was further investigated through material characterization, regeneration cycle experiments, aeration experiments, and quenching experiments, and the degradation pathway of AB10B was speculated. The results indicated that AB10B molecules were firstly adsorbed onto the active sites on the electrode surface, and then azo bond was broken under the action of active hydrogen atoms generated by Fe electrochemical corrosion. The cracking products were converted into intermediates such as dimethyl phthalate and N-isopropyl-cyclohexylamine through reduction and ring opening reactions. Finally, some intermediates were gradually converted into small molecule organic compounds or completely mineralized into CO₂ and H₂O under the further action of a small amount of ·OH.

Key words: Amino black 10B, internal electrolysis of iron and copper, response surface methodology, degradation mechanism

摘要：

氨基黑10B（AB10B）是典型的偶氮染料之一，其分子结构高度稳定，具备难降解、毒性强等特性。构建铁铜（Fe-Cu）内电解体系，基于响应曲面法，以AB10B去除率为响应值，固定其溶液体积为250 mL，初始质量浓度为40 mg/L，铁屑投加量为10 g，解析Cu投加量、反应时间、废水初始pH的交互作用，并获取最佳反应条件，即初始pH为2，Cu投加量为1.34 g，反应时间为120 min，该条件下AB10B去除率达95.97%。进一步通过材料表征、再生循环实验、曝气实验和猝灭实验研究Fe-Cu内电解体系降解AB10B的机制，并推测AB10B降解途径。结果表明，AB10B分子首先吸附于电极表面活性位点，随后在Fe电化学腐蚀产生的活性氢原子作用下发生偶氮键断裂；裂解产物经还原与开环等反应转化为邻苯二甲酸二甲酯、N-异丙基环己胺等中间体，最终，部分中间体在少量·OH的进一步作用下逐步转化为小分子有机物或彻底矿化为CO₂和H₂O。

关键词: 氨基黑10B, 铁铜内电解, 响应曲面法, 降解机制

CLC Number: 

• X788