生物炭吸附耦合过硫酸盐再生去除水中腐殖酸  

Removal of humic acid from water by biochar adsorption coupled with persulfate regeneration

作　　者：张晨[1] 王一博 燕可洲 李剑锋 程芳琴 ZHANG Chen;WANG Yibo;YAN Kezhou;LI Jianfeng;CHENG Fangqin(School of Resources and Environment,Shanxi University of Finance and Economics,Taiyuan 030006,China;Institute of Resources and Environmental Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西财经大学资源环境学院,山西太原030006 [2]山西大学资源与环境工程研究所,山西太原030006

出　　处：《工业水处理》2023年第10期95-103,共9页Industrial Water Treatment

基　　金：国家自然科学基金项目(22106096,22178203);山西省回国留学人员科研资助项目(2021-102);山西省水利科学技术研究与推广项目(2022GM026)。

摘　　要：生物炭来源广泛、成本低,可活化过硫酸盐实现吸附和催化降解水中污染物的功能。然而,生物炭吸附和催化性能较低、回收性较差、孔道易堵塞等缺点限制了其推广应用。提出了利用椰壳生物炭(CB)吸附耦合过二硫酸盐(PDS)再生实现去除水中腐殖酸(HA)的方法。结果表明,CB本身可通过吸附或催化PDS实现HA降解,而经PDS再生后CB的吸附和催化速率分别提高了2.4和3.2倍;循环利用4次后,CB仍保持有较高的吸附和催化活性。PDS再生丰富了CB表面的孔隙结构及活性位点,有效活化了CB,促进了HA在其表面的吸附,进而促进了催化过程。体系中碱性含氮和含氧官能团是吸附催化体系的有效活性位点,发挥降解作用的主导活性氧物种为SO_(4)^(·-)和^(1)O_(2),吡啶氮和吡咯氮相比石墨氮在非自由基氧化去除HA体系中起到更有效的贡献。CB吸附耦合PDS再生能实现对HA的高效去除,且该方法成本低廉、简单可行,具有良好应用价值。Biochar has a wide range of sources,low cost,and can activate persulfate to adsorb and catalyze the degradation of pollutants in water.However,the disadvantages of biochar,such as low adsorption and catalytic performance,poor recovery,and easy blockage of pores,restrict its popularization and application.A method of humic acid(HA) removal from water by coconut shell biochar(CB) adsorption coupled with persulfate(PDS) regeneration was proposed.The results showed that CB could degrade HA by adsorption or catalytic PDS,while the adsorption and catalytic rates of CB after PDS regeneration increased by 2.4 and 3.2 times respectively.After recycling for 4 times,CB still maintained high adsorption and catalytic activity.PDS regeneration enriched the pore structure and active site of CB surface,effectively activated CB,promoted the adsorption of HA on its surface,and then promoted the catalytic process.The basic nitrogen-and oxygen-containing functional groups in the system were the effective active sites in the adsorption and catalytic system,SO_4~(·-)and ~1O_(2) were the dominant reactive oxygen species that played the role of degradation.Compared with graphite N,pyridine N and pyrrole N played a more effective contribution to the removal of HA by non-free radical oxidation.CB adsorption coupled PDS regeneration could achieve efficient removal of HA.This method was low cost,simple and feasible,and had good application value.

关 键 词：生物炭 过硫酸盐 再生 催化降解 吸附 腐殖酸 

分 类 号：X703[环境科学与工程—环境工程]