不同碳源的生物质炭-磷化铁/零价铁的制备及对水中3,4,5,6-四氯吡啶-2-羧酸的去除
Preparation of biochar-iron phosphide/zero-valent iron with different carbon sources and removal of 3,4,5,6-Tetrachloropyridine-2-carboxylic acid from water solution
靳惠文 1张小乐 2牛红云 3蔡亚岐3
作者信息
- 1. 华北理工大学生命科学学院,唐山,063210;环境化学与生态毒理学国家重点实验室,中国科学院生态环境研究中心,北京,100085
- 2. 华北理工大学生命科学学院,唐山,063210
- 3. 环境化学与生态毒理学国家重点实验室,中国科学院生态环境研究中心,北京,100085
- 折叠
摘要
改性生物炭材料在环境污染物去除中的应用越来越广泛.本文以鸡粪(CM)、咖啡渣(CG)、活性污泥(SL)等3种废弃生物质为碳源,制备了3种生物质炭-磷化铁/零价铁复合材料(BC-FexP/Fe).这些材料主要由生物质炭、磷酸铁、磷化铁、零价铁或碳化铁及氧化铁组成.用于降解水中的3,4,5,6-四氯吡啶-2-羧酸(TCPA)时,以活性污泥为碳源的SL-FexP/Fe材料对TCPA的去除效果明显优于以鸡粪为碳源的CM-FexP/Fe和以咖啡为碳源的CG-FexP/Fe材料,而且SL-FexP/Fe对TCPA的降解受pH影响较小.在中性 pH 反应 6 h 后,CM-FexP/Fe、CG-FexP/Fe 和 SL-FexP/Fe 对 10 mg·L-1 的 TCPA 的降解率分别为 90.1％、71.1％和100％,矿化率分别为33.25％、22.61％和64.27％.掩蔽实验和电子自旋共振(ESR)结果表明,SL-FexP/Fe体系存在多种活性氧物质.使用前后材料的X射线晶体衍射和X射线光电子能谱分析,材料中的FexP、Fe3C、Fe和氮掺杂生物质炭均在有机污染物的降解过程中发挥了作用.
Abstract
Modified biochar materials are more and more widely used in the removal of environmental pollutants.In this study,several biochar-iron phosphide/zero-valent iron composites(BC-FexP/Fe)were prepared with chicken manure(CM),coffee grounds(CG)or activated sludge(SL)as carbon source.These materials were mainly composed of biochar,iron phosphate,zero-valent iron or iron carbide and iron oxide.When used for the degradation of 3,4,5,6-tetrachloropyridine-2-carboxylic acid(TCPA)from water,the removal efficiency of TCPA by SL-FexP/Fe with activated sludge as carbon source was better than that by CM-FexP/Fe with chicken manure as carbon source and CG-FexP/Fe with coffee ground as carbon source.Furthermore,the degradation of TCPA by SL-FexP/Fe was less affected by pH than those by CM-FexP/Fe and CG-FexP/Fe.At neutral pH,the degradation percentage of TCPA(10 mg·L-1)by CM-FexP/Fe,CG-FexP/Fe and SL-FexP/Fe were 90.1％,71.1％and 100％,and the mineralization efficiency was 33.25％,22.61％and 64.27％,respectively within 6h.The masking experiments and electron spin resonance(ESR)results showed the coexistence of various active oxygen species in SL-FexP/Fe system.X-ray diffraction and X-ray photoelectron spectroscopy analysis of the fresh and used materials suggested that FexP,Fe3C,Fe and nitrogen-doped biochar in the materials all played roles during the degradation of organic pollutants.
关键词
废弃生物质/改性生物炭/复合材料/3,4,5,6-四氯吡啶-2-羧酸Key words
waste biomass/modified biochar/composites/3,4,5,6-tetrachloropyridine-2-carboxylic acid引用本文复制引用
基金项目
国家自然科学基金(22036007)
国家自然科学基金(22276207)
河北省自然科学基金(B2020209005)
出版年
2024
NETL
NSTL
万方数据