草酸改性生物炭对重金属铬污染土壤的修复研究  

Study on Remediation of Chromium Contaminated Soil by Oxalic Acid Modified Biochar

作　　者：罗莹莹 华碧成 吴钦鸿 林嘉杏 麦思晓 吴雨桃 LUO Yingying;HUA Bicheng;WU Qinhong;LIN Jiaxing;MAI Sixiao;WU Yutao(College of Chemistry and Environmental Engineering,Hanshan Normal University,Guangdong Chaozhou 521041,China)

机构地区：[1]韩山师范学院化学与环境工程学院,广东潮州521041

出　　处：《广州化工》2024年第19期136-138,共3页GuangZhou Chemical Industry

基　　金：广东省2022年大学生创新创业训练项目(No:S202210578002)。

摘　　要：由农业废弃物花生壳在500℃下煅烧炭化制成生物炭产品,再利用草酸改性生物炭,进行模拟Cr污染土壤的修复实验研究。对生物炭进行扫描电镜(SEM)、傅里叶红外光谱(FTIR)表征,探究草酸改性生物炭对Cr的吸附机理。结果表明草酸改性生物炭的层级间隙明显、生物炭表面孔隙丰富且生物炭含氧官能团提高,成功负载-COOH官能团。改性生物炭投加量的增加和土壤中铬浓度的降低均有利于土壤中水溶态铬的去除,毒性淋滤实验表明反应后土壤中的铬迁移性明显降低。研究结果可为生物炭材料应用于铬污染土壤的修复提供理论依据。Biochar products were made from agricultural waste peanut shells calcined and carbonized at 500℃,and then oxalic acid-modified biochar was used to conduct experimental studies on remediation of simulated Cr-contaminated soil.The biochar was characterized by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR)to investigate the adsorption mechanism of Cr on oxalic acid-modified biochar.The results showed that the oxalic acid-modified biochar had obvious interlayer gaps,rich pores on the surface of the biochar,and the oxygen-containing functional groups of the biochar were increased,and the-COOH functional group could be successfully loaded.The increase of the modified biochar dosage and the decrease of the chromium concentration in the soil were both favorable to the removal of water-soluble chromium in the soil,and the toxicity leaching experiments showed that the chromium mobility in the soil was significantly reduced after the reaction.The results of the study can provide a theoretical basis for the application of biochar materials in the remediation of chromium-contaminated soil.

关 键 词：生物炭 改性 重金属 吸附 修复土壤 

分 类 号：X53[环境科学与工程—环境工程]