改性猪粪制生物炭活化过硫酸盐(PS)去除罗丹明B

Removal of Rhodamine B by modified pig manure made biochar-activated persulfate(PS)

为了探究生物炭活化过硫酸盐(PS)去除罗丹明B(RhB)的效能,实验以猪粪为原料,采用限氧热解法(700℃)制备生物炭并进行酸碱改性,通过扫描电镜(SEM),比表面积分析仪(BET),傅里叶红外光谱仪(FTIR)和X射线衍射仪(XRD)对材料进行了表征分析,同时探究了生物炭吸附RhB的机理以及作为催化剂活化PS脱色RhB的最佳体系,影响因素和反应机制。结果表明,改性后生物炭的比表面积,总孔体积显著增加,含有丰富的含氧官能团;生物炭吸附RhB的过程受表面吸附和颗粒内扩散共同控制,更符合二级动力学,是一种化学吸附过程;体系“SBC(硫酸改性生物炭)+PS”脱色RhB的效果最优,酸性条件更有利于反应进行,RhB去除率随着生物炭和PS投加量的增大而增大;SBC重复利用效能良好,可以作为活化PS的有效催化剂,体系“SBC+PS”中可能同时存在自由基和非自由基两种机制协同降解RhB。综上,本研究致力于探索一种低成本的废水处理方案,以期达到以废治废的目的。

In order to investigate the effectiveness of biochar activated persulfate(PS)for Rhodamine B(RhB)removal,biochar was prepared by oxygen-limited pyrolysis(700℃)using pig manure as raw material and modified with acid-base.The paper also investigated the mechanism of RhB adsorption on biochar and the optimal system for the activation of PS decolorization of RhB as a catalyst,the influencing factors and the reaction mechanism.The results showed that,The specific surface area and total pore volume of the modified biochar increased significantly and contained abundant oxygen-containing functional groups;The adsorption of RhB by biochar was controlled by both surface adsorption and intraparticle diffusion,which was more in line with secondary kinetics and was a chemisorption process;The"SBC(Sulfuric acid-modified biochar)+PS"system has the best effect on RhB decolorization,the acidic condition is more favorable to the reaction,and the removal rate of RhB increases with the increase of biochar and PS dosage;SBC has good reuse efficiency and can be used as an effective catalyst for activation of PS,and there may be both free radicals and non-free radicals in the"SBC+PS"system.In conclusion,this study is dedicated to explore a low-cost solution for wastewater treatment in order to achieve the goal of treating waste with waste.