改性棉杆基生物炭对土壤重金属污染物吸附性能研究  

Study on Adsorption Performance of Modified Cotton Stalk Based Biochar for Heavy Metal Pollutants in Soil

作　　者：倪宇航 韩志伟 易世蓉 陈思思 赵冬梅 涂永峰 吉丽丽 王琳琳 NI Yu-hang;HAN Zhi-wei;YI Shi-rong;CHEN Si-si;ZHAO Dong-mei;TU Yong-feng;JI Li-li;WANG Lin-lin(College of Chemistry and Chemical Engineering,Xinjiang Agricultural University,Urumuqi Xinjiang 830052,China;Xinjiang Huier Agriculture Group Co.,Ltd.,Changji Xinjiang 831100,China)

机构地区：[1]新疆农业大学化学化工学院,新疆乌鲁木齐830052 [2]新疆慧尔农业集团股份有限公司,新疆昌吉831100

出　　处：《干旱环境监测》2024年第4期151-157,共7页Arid Environmental Monitoring

摘　　要：本研究以棉花秸秆为原料制备酸改性和碱改性生物炭,对其形貌、结构和吸附性能进行表征。通过扫描电镜分析,在2000倍放大倍数下,观察到孔道结构发生变化,更多微孔和中孔出现,吸附位点增多,促进吸附质在孔隙间的扩散;通过红外谱图分析,可知酸改性增加了羧基官能团数量,增加了吸附污染物的酸结合位点;碱改性增加了羟基官能团的数量,共轭程度增大,促进吸附;在原子荧光和电感耦合等离子体质谱中,改性生物炭与土壤复配后对重金属离子的吸附率相较于与原土壤复配吸附大大提高,最终都会达到吸附饱和,其对As^(3+)、Hg^(2+)、Pb^(2+)、Cd^(2+)最大吸附率分别达到69.5%、98.9%、79.5%、59.7%,改性棉杆基生物炭对土壤中主要重金属离子的吸附效果较好,在土壤修复方面具有应用价值。In this study,acid-modified and alkali-modified biochar was prepared from cotton straw,and its morphology,structure and adsorption properties were characterized.By SEM analysis,under the magnification of 2000 times,it was observed that the pore structure changed,more micropores and mesopore appeared,and the adsorption sites increased,which promoted the diffusion of adsorbants between pores.By infrared spectrum analysis,it can be seen that acid modification increases the number of carboxyl functional groups and the acidbinding sites for adsorbing pollutants.Alkali modification increases the number of hydroxyl functional groups,increases the degree of conjugation,and promotes adsorption.In atomic fluorescence and inductively coupled plasma mass spectrometry,the adsorption rate of modified biochar mixed with soil for heavy metal ions is greatly improved compared with that of the original soil mixed with soil,and the adsorption saturation will eventually be reached,with the maximum adsorption rates for As 3+,Hg 2+,Pb 2+and Cd 2+reaching 69.5%,98.9%,79.5%and 59.7%,respectively.The experimental results show that the modified cotton stalk based biochar has a good adsorption effect on the main heavy metal ions in soil,and has application value in soil remediation.

关 键 词：棉花秸秆 改性 生物炭 吸附 

分 类 号：X830.2[环境科学与工程—环境工程]