氨水改性石墨毡阴极电芬顿降解效能研究

Electro-Fenton Degradation Efficiency of the Ammonia-Water Modified Graphite Felt Cathode

文章采用氨水改性石墨毡(GF),研究了改性GF(M-GF)的物理化学性能,并考察了将其用作电Fenton阴极对实际垃圾渗滤液的降解效能。FT-IR图谱、接触角、SEM分析结果表明:改性后GF表面的含氧官能团增多、亲水性增强、比表面积增大。实验结果表明,M-GF的吸附性能和电催化产H2O2性能都明显增强,180 min内,GF和M-GF电催化产H2O2浓度分别为526 mg/L和763mg/L。M-GF阴极电Fenton体系对垃圾渗滤液的降解效能显著提升,180 min内GF阴极电Fenton体系对垃圾渗滤液的COD、氨氮去除率分别为31.88%和43.37%,而M-GF阴极电Fenton体系的COD、氨氮去除率分别达47.96%和97.10%;阴极电Fenton过程中存在部分铁量损失,但M-GF体系的铁量损失较小且其亚铁离子再生能力增强。

The graphite felt(GF)was modified by ammonia-water,and the physical and chemical properties of the modified GF were studied.Employing the modified GF(M-GF)as the cathode,the degradation efficiency of the modified cathode eletro-Fenton for actual landfill leachate was studied.The results of FT-IR,contact angle and SEM indicated that the surface of GF had more oxygen-containing functional group,better hydrophilicity and larger specific surface area after modification.The experimental results illustrated that both the adsorption property and H2 O2 electrogeneration property of M-GF were enhanced,and the concentration of H2 O2 generated by GF and M-GF cathode were 526 mg/L and 763 mg/L in 180 min respectively.The degradation efficiency of M-GF cathode electro-Fenton for landfill leachate was significantly enhanced,and the COD and ammonia nitrogen removal efficiency of the M-GF cathode electro-Fenton system were 47.96%and 97.10%in 180 min while those of GF cathode electro-Fenton system were 31.88%and 43.37%respectively.There was a partial loss of iron in the process of cathode electro-Fenton,but that of M-GF system was little than GF system and the ferrous ion regeneration ability of M-GF was improved.