生态学杂志2024，Vol.43Issue(9)：2859-2870,12.DOI:10.13292/j.1000-4890.202409.039
钙基胡敏酸改性生物炭的制备及其对镉污染的修复
Preparation of biochar modified by calcium and humic acid for cadmium pollution remediation
摘要
Abstract
Biochar is a commonly used material for remediation of cadmium contaminated soil,but its efficiency is not high.To improve the adsorption capacity of biochar for Cd2+,rice straw biochar was modified by loading Ca2+and activating modification by humic acid oxidation impregnation.The materials were characterized by scanning electron microscopy(SEM)and energy dispersive X-ray spectroscopy(EDS),Fourier transform infrared spectros-copy(FTIR)and X-ray photoelectron spectroscopy(XPS).Batch adsorption experiments and pot experiments were carried out to explore the adsorption fixation properties and mechanism of the materials for Cd2+.The results showed that:(1)The best adsorption performance was observed when the mass ratio of biochar to humic acid was 1∶1 and the concentration of Ca2+was 1.5 g·L-1(referred to as RHB1-1),and the maximum adsorption capacity was 74.46 mg·g-1,which was 61％higher than that of original biochar.(2)The content of acidic oxygen-containing func-tional groups on the surface of calcium-humic acid modified biochar was significantly increased,and the free hydroxyl group was newly formed.Cd2+was efficiently adsorbed by coordination chelation and complexation co-ion exchange.The adsorption of Cd2+by calcium-humic acid modified biochar was mainly chemisorption,which was consistent with Freundlich adsorption isotherm model.(3)The materials can absorb Cd2+in soil and promote the transformation of Cd2+from an acid extractable state to a residual state,reducing the bioavailability of Cd2+in soil.关键词
生物炭/胡敏酸/Ca2+/Cd2+Key words
biochar/humic acid/Ca2+/Cd2+引用本文复制引用
谭慧,王少锋,廉梅花,曾祥峰,贾永锋..钙基胡敏酸改性生物炭的制备及其对镉污染的修复[J].生态学杂志,2024,43(9):2859-2870,12.基金项目
国家重点研发计划(2020YFC1807800)、辽宁省兴辽英才计划项目(XLYC2007192)、沈阳市科技计划项目(21-108-9-29)和中央高校基本科研业务费(DUT22RC(3)074)资助. （2020YFC1807800）
