生物质基碳材料的制备及其在电芬顿降解体系中的应用

偶氮类染料因其色度高、毒性大的特点,借助传统处理方法很难对其进行有效降解。高级氧化技术中的阴极电芬顿法利用H_2O_2和Fe²⁺生成氧化能力较强的羟基自由基(·OH),从而实现水体中偶氮染料的高效降解。该研究选取生活中常见且蛋白质含量较高的韭苔为前驱体,以KHCO_3为活化剂,高温热解制备生物质基碳电极材料(CS-R),并成功应用于电芬顿法降解甲基红(MR)体系。经过对所制备得到的系列样品进行优化筛选,CS-3表现出良好的氧还原性能,其作为阴极电催化剂对MR染料的降解效率在60min时达到了99%。研究结果表明,高的比表面积、氮含量、石墨化程度和超亲水性对于生物质基碳材料的电芬顿降解性能至关重要,这为电芬顿体系阴极材料的选择、制备提供了技术指导。

Preparation of biomass-derived carbon materials and application for electro-Fenton degradation system

Azo dyes, as one of the serious dyestuff are difficult to degrade among the various pollutants owing to their high colority and toxicity. The electro-Fenton process consists of two parts,(1) the in-situ electrogeneration of H 2O 2 by two-electron reduction of oxygen,(2) the reaction of H2O2 with Fe^2+ to form a strong oxidant ·OH, which unselectively attacks organic pollutants. Herein, biomass-derived carbon materials fabricated from chives stem (CS) were used as cathode electrocatalysts to degrade the targeted methyl red (MR) dye. The model sample CS-3 exhibited superior oxygen reduction reaction performance as the EF cathode catalyst and the degradation efficiency of MR reached 99% merely within 60 min. This research demonstrates that the high specific surface area, degree of graphitization, content of N and superhydrophilicity play crucial roles in the electro-Fenton degradation performance of the carbon materials, which provides guidance for the electro-Fenton electrode materials optimizing.