Fe/Mn改性核桃壳生物炭对水中Sb^(3+)的去除及机理研究  

Study on the removal and mechanism of Sb^(3+)in water by Fe/Mn-modified walnut shell biochar

作　　者：陈桃莉 魏本龙 王梦晓 刘转年[1] Chen Taoli;Wei Benlong;Wang Mengxiao;Liu Zhuannian(College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054)

机构地区：[1]西安科技大学地质与环境学院,西安710054

出　　处：《化工新型材料》2025年第2期203-209,共7页New Chemical Materials

基　　金：陕西省重点研发计划项目(2022SF-578);陕西省水利科技计划资助项目(2022slkj-5)。

摘　　要：以核桃壳为原料制备生物质活性炭,对比了不同热解温度的核桃壳生物炭对Sb^(3+)的吸附性能,并对核桃壳生物炭使用Fe/Mn共沉淀法进行改性,采用扫描电镜(SEM)、BET比表面、X射线衍射(XRD)、X射线光电子能谱(XPS)和红外光谱(FT-IR)等手段对两种生物炭进行表征,分析其对Sb^(3+)的吸附性能和机理。结果表明:与单纯热解碳化相比,Fe/Mn元素的引入增加了原始生物炭表面的含氧官能团,比表面积从13.801m^(2)/g提高到305.732m^(2)/g。核桃壳及Fe/Mn改性生物炭对水溶液中Sb^(3+)的吸附符合准二级动力学方程和Langmuir吸附等温模型。改性生物炭对Sb^(3+)的最大吸附量为68.062mg/g,吸附机制主要有铁氧化物络合、Sb^(3+)—π键相互作用及锰氧化物的还原反应。The biochar was prepared from walnut shell,and the adsorption properties of the walnut shell biochar produced at different pyrolysis temperatures Sb^(3+)were compared.The walnut shell biochar was modified by Fe/Mn co-precipitation method.The two kinds of biochar was characterized by SEM,BET,XRD,XPS and FT-IR,and the adsorption properties and mechanisms for Sb^(3+)were analyzed.The results showed that,compared to simple pyrolytic carbonization,the introduction of Fe/Mn elements increased the oxygen-containing functional groups on the surface of the original biochar,and the specific surface area increased from 13.801m^(2)/g to 305.732m^(2)/g.The adsorption of Sb^(3+)in aqueous solution by the walnut shell biochar and Fe/Mn-modified biochar conformed to the pseudo-second-order kinetic equation and Langmuir adsorption isotherm model.The maximum adsorption capacity of Sb^(3+)by modified biochar was 68.062mg/g.The adsorption mechanism mainly included iron oxide complexation,Sb^(3+)—πbond interaction,and manganese oxide reduction reaction.

关 键 词：核桃壳 热解 吸附 Fe/Mn Sb^(3+) 

分 类 号：X506[环境科学与工程—环境工程]