摘要
重金属Cr(Ⅵ)污染是目前亟需解决的突出环境问题,生物炭吸附法是一种最经济有效的方法之一。针对常规生物炭吸附率低的问题,以褐煤和稻秸秆为原材料制备生物炭,利用响应面设计法研究NH_(4)Cl、FeCl_(3)、CaCl_(2)在微波辅助条件下对生物炭进行改性,并通过FTIR、XRD、SEM等对生物炭进行表征,最后利用改性秸秆生物炭对重金属Cr(Ⅵ)进行吸附研究。结果表明,采用FeCl_(3)改性,吸附时间为6 h、温度60℃、pH为7的条件下吸附效果最佳,吸附率为95.8%。在FeCl;改性后,Langmuir比表面积由52.24 m^(2)/g增加到127.54 m^(2)/g,表面出现大量微孔,有利于对重金属的吸附。
The pollution of heavy metal Cr(Ⅵ) is an outstanding environmental problem to be solved at present. Biochar adsorption is one of the most economical and effective methods. Aiming at the problem of low adsorption rate of conventional biochar, the lignite and rice straw were taken as raw materials to prepare biochar. Response surface methodology was used to investigate the modification of biochar with NH_(4)Cl, FeCl_(3) and CaCl_(2) under microwave assisted conditions. Furthermore, the biochar was characterized by FTIR, XRD, SEM, etc. Finally, the adsorption of heavy metal Cr(Ⅵ) by modified straw biochar was studied. The results show that using FeCl_(3)for modifying, the adsorption effect is the best under the optimal conditions with the adsorption time of 6 h, the temperature of 60℃ and the pH of 7, acheiving an adsorption rate of 95.8%. After modification of FeCl_(3), the specific surface area of Langmuir increases from 52.24 m^(2)/g to 127.54 m^(2)/g, and a large number of micropores appear on the surface, which is conducive to the adsorption of heavy metals.
作者
韩世明
董梦
刘栓
丁亚玲
石开仪
HAN Shiming;DONG meng;LIU Shuan;DING Yaling;SHI Kaiyi(School of Biological Science and Technology,Liupanshui Normal University,Liupanshui,Guizhou 553004,China;School of Chemistry and Materials Engineering,Liupanshui Normal University,Liupanshui,Guizhou 553004,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第1期145-149,共5页
Mining Research and Development
基金
国家大学生创新创业训练计划项目(2235)
贵州省重点支持学科项目(黔学位合字ZDXK﹝2016﹞24号)。
关键词
生物炭
改性
响应面
CR
比表面积
Biochar
Modification
Response surface
Cr
Specific surface area
