石墨烯促进Fenton氧化处理制浆中段废水的研究

Study on Effect of Graphene on Middle Stage Pulping Effluent Treatment by Fenton Oxidation

中文关键词:  石墨烯  Fenton反应  制浆中段废水  COD_Cr去除率  UV254值

Key Words:graphene  Fenton oxidation  middle stage pulping effluent  COD_Cr removal rate  UV254 value

中文摘要:

      以制浆中段废水为研究对象，首先采用正交实验研究了石墨烯促进Fenton氧化的各影响因素间的显著程度，然后通过单因素实验研究了废水pH值、石墨烯加入量以及H₂O₂加入量对废水处理效果的影响。结果表明，石墨烯促进Fenton氧化的各影响因素间的显著程度为废水pH值>石墨烯加入量>H₂O₂加入量>n（Fe²⁺）∶n（H₂O₂）；加入石墨烯后，Fenton反应的最佳pH值由4提高至6；石墨烯最佳加入量为3 mg/L；随着H₂O₂的不断加入，制浆中段废水降解效果先不断升高而后趋于平稳，H₂O₂的最佳加入量为7 mL/L。Fenton反应体系符合一级反应动力学方程，加入石墨烯的Fenton反应速率常数k为0.0632 min-1，比传统Fenton反应速率常数大，表明制浆中段废水的降解速率明显加快。

Abstract:

      The orthogonal test was used to investigate the significances of the influencing factors in Fenton oxidation treatment of middle stage pulping effluent with the existence of graphene. The results showed that the important degree of various factors was as follows: pH value> graphene dosage> H₂O₂ dosage> the molar ratio of Fe²⁺ to H₂O₂. Then， effects of pH value， the graphene and H₂O₂ dosages were studied using single factor test. It showed that the optimum pH value changed from 4 to 6 after the addition of graphene. The optimum grapheme dosage was 3 mg/L. The treatment effect increased continuously and then stabilized with the H₂O₂ dosage increasing and the H₂O₂ dosage was preferred to be 7 mL/L. The first-order reaction kinetics equation was conformed for Fenton reaction system. The reaction rate constant k of the Fenton system with the existence of graphene was up to 0.0632 min^-1， which was larger than that of the traditional Fenton system. The pollutant degradation rate was obviously accelerated by graphene．