二乙烯三胺改性磁性生物炭对Cr(Ⅵ)吸附性能研究  

Study on Adsorption of Cr(Ⅵ)on Magnetic Biomass Carbon Modified by Diethylenetriamine

作　　者：杨鑫宇 张全悦 武中豪 张娜 赵俭波[1,2] 胡立兵 YANG Xin-yu;ZHANG Quan-yue;WU Zhong-hao;ZHANG Na;ZHAO Jian-bo;HU Li-bing(Engineering Laboratory of Chemical Resources Utilization in South Xinjiang,Xinjiang Production&Construction Corps,Alar 843300,China;College of Chemistry and Chemical Engineering,Tarim University,Alar 843300,China)

机构地区：[1]新疆兵团南疆化工资源利用工程实验室,新疆阿拉尔843300 [2]塔里木大学化学化工学院,新疆阿拉尔843300

出　　处：《化学试剂》2023年第1期122-128,共7页Chemical Reagents

基　　金：塔里木大学校长基金资助项目(TDZKSS202127);国家自然科学基金资助项目(21865026)。

摘　　要：为解决水体重金属Cr(Ⅵ)的环境污染问题,以棉秆为原料制备生物炭(BC),再采用液相沉淀法将BC赋磁,得到磁性生物炭(MBC)。以二乙烯三胺(DETA)为改性试剂,对MBC进行氨基改性,制备出氨基改性磁性生物炭吸附剂DETA@MBC。用XRD、SEM、FT-IR、VSM对DETA@MBC进行表征,证实了Fe_(3)O_(4)成功负载在BC表面,MBC的氨基改性没有破坏Fe_(3)O_(4)的晶体构型,DETA@MBC表面有丰富的氨基功能团,且饱和磁强度良好。研究其作为吸附剂在不同条件下对Cr(Ⅵ)的吸附性能。结果表明,溶液pH值、吸附剂投加量、竞争性离子和温度等因素均会影响吸附效果。DETA@MBC对Cr(Ⅵ)的吸附更符合准二级动力学方程,等温吸附过程符合Freundlich模型,K F=25.287 mg^(1-(1/n))·L^(1/n)·g^(-1),n=2.538,吸附容易进行,对Cr(Ⅵ)的吸附为自发的吸热过程。In order to solve the problem of environmental pollution caused by heavy metal Cr(Ⅵ)in water,biochar(BC)derived from cotton stalk was prepared,and then magnetic biochar(MBC)was synthesized using the precipitation methods.Diethylenetriamine(DETA)was used as modification reagent to aminate the surface of magnetic biochar(MBC),so that amino modified magnetic biomass carbon material DETA@MBC was prepared.DETA@MBC was characterized by XRD,SEM,FT-IR and VSM techniques,which confirmed that Fe_(3)O_(4) was successfully loaded on the surface of BC.The amino modification of MBC did not destroy the crystal configuration of Fe_(3)O_(4).There were abundant amino functional groups on the surface of DETA@MBC with high saturation magnetization.The adsorption properties of DETA@MBC on Cr(Ⅵ)under different conditions were studied,which showed that the pH value of solution,the amount of adsorbent,competitive ions and temperature all affected the adsorption effect.The adsorption of Cr(Ⅵ)by DETA@MBC was more consistent with the quasi-second-order kinetic equation.The isotherm adsorption process accorded with Freundlich model,K F=25.287 mg^(1-(1/n))·L^(1/n)·g^(-1),n=2.538,adsorption process was easy to proceed,and the adsorption of Cr(Ⅵ)was a spontaneous endothermic process.

关 键 词：生物炭 氨基改性 吸附 FREUNDLICH模型 动力学 

分 类 号：TQ424.3[化学工程]