环境保护科学2025，Vol.51Issue(5)：125-133,139,10.DOI:10.16803/j.cnki.issn.1004-6216.202408040
硫铁改性核桃壳生物炭对汞的吸附性能研究
Properties of adsorption for walnut shell biochar modified by iron and sulfur for mercury
摘要
Abstract
To improve the adsorption performance of walnut shell biochar for mercury,walnut shell biochar was modified with ferric sulfate,ferrous sulfate,and sodium thiosulfate to prepare magnetically modified biochar(BCM),iron-modified biochar(BCFe),and sulfur and iron modified biochar((BCFe+S).The modified biochars were characterized by Brunauer-Emmett-Teller(BET)specific surface area analysis and Fourier transform infrared spectroscopy(FTIR),and the adsorption characteristics of each biochar for Hg2+were investigated under different conditions.The results showed that the average pore diameter and pore volume of all three modified biochars were increased;among them,the specific surface area of biochar was enhanced for BCFe and BCFe+S.Characteristic functional groups of Fe-O and-SH were added after modification.The removal rate of Hg2+was gradually increased with the increase in dosage and pH.The adsorption process was consistent with the pseudo-second-order kinetic model and Freundlich isotherm model,indicating that the adsorption process was a heterogeneous multi-layer chemical adsorption process.The fitted maximum adsorption capacities of BCM,BCFe and BCFe+S were 11.42,10.65,and 8.82 mg/g,respectively,which were 1.5,1.3,and 0.9 times higher than that of unmodified biochar(BC,4.56 mg/g).All three modification methods improved the adsorption capacity of biochar for Hg2+to a certain extent.Therefore,sulfur and iron modified biochar has great potential in Hg2+removal.关键词
改性生物炭/硫铁/汞/吸附Key words
modified biochar/sulfur and iron/mercury/adsorption分类
环境科学引用本文复制引用
张钰,钟顺清..硫铁改性核桃壳生物炭对汞的吸附性能研究[J].环境保护科学,2025,51(5):125-133,139,10.基金项目
国家自然科学基金项目(42077297) （42077297）
