PEI功能化秸秆生物炭对水中Cr6+的吸附性能  

Adsorption of Cr6+ on Polyethyleneimine-functionalized Straw Biochar from Aqueous Solution

作　　者：徐建玲[1] 张頔 聂苗青 王汉席[1] 李龙威 XU Jianling;ZHANG Di;NIE Miaoqing;WANG Hanxi;LI Longwei(State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,School of Environment,Northeast Normal University,Changchun 130117,China)

机构地区：[1]国家环境保护湿地生态与植被恢复重点实验室东北师范大学环境学院

出　　处：《高等学校化学学报》2020年第1期155-161,共7页Chemical Journal of Chinese Universities

基　　金：吉林省自然科学基金(批准号:20180101092JC)资助~~

摘　　要：选取玉米秸秆为原料,经过缺氧炭化制备玉米秸秆生物炭,并以聚乙烯亚胺(PEI)负载于生物炭表面,制备PEI功能化秸秆生物炭,研究了其对水中Cr^6+的吸附性能和机理.结果表明,在吸附剂添加量相等条件下,PEI碱性生物炭(PBC)对Cr^6+的吸附效率明显高于PEI酸性生物炭(HBC)和原始生物炭(CBC).PBC对水中Cr^6+的最大吸附量为386.3 mg/g,吸附平衡时间为300 min;当pH=2.0左右时,对Cr^6+的吸附效率最大达到95.94%.因此,PBC可作为一种高效去除水中Cr^6+的吸附剂.To study the properties of straw biochar composites and the adsorption characteristics of Cr^6+ from water,corn stalks were selected as raw material and corn stalk biochar was prepared by anoxic carbonization and loaded on the surface of biochar with polyethyleneimine(PEI).PEI-functionalized straw biochar was prepared,and its adsorption performance and the mechanism of Cr^6+ adsorption were characterized.The results showed that the adsorption efficiency of PEI alkaline biochar(PBC)on Cr^6+ was significantly higher than that of PEI acidic biochar(HBC)and raw biochar(CBC)under the same conditions of adsorbent addition.The maximum adsorption capacity of Cr^6+ on PBC from aqueous solution was 386.3 mg/g,and the adsorption equilibrium time was 300 min.When the pH was approximately 2.0,the adsorption efficiency of Cr^6+ reached 95􀆰94%.Therefore,PBC can be used as an adsorbent for the efficient removal of Cr^6+ in water.

关 键 词：玉米秸秆 生物炭 聚乙烯亚胺 CR^6+ 吸附 

分 类 号：O647[理学—物理化学]