Microbial aging of hydrochar as a way to increase cadmium ion adsorption capacity: Process and mechanism
文献类型： 外文期刊
作者： Hua, Yun 2 ; Zheng, Xuebo 1 ; Xue, Lihong 2 ; Han, Lanfang 4 ; He, Shiying 2 ; Mishra, Tripti 2 ; Feng, Yanfang 2 ; Yang, 1 ;
作者机构： 1.Chinese Acad Agr Sci, Key Lab Tobacco Biol & Proc, Minist Agr & Rural Affairs, Tobacco Res Inst, Qingdao 266101, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China
3.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China
4.Guangdong Univ Technol, Inst Environm & Ecol Engn, Guangzhou 510006, Peoples R China
5.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA
6.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Jiangsu, Peoples R China
关键词： Sawdust hydrochar; Microbially aged process; Cadmium; Adsorption mechanisms; Biochar aging
期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.642； 五年影响因子：9.237 ）
ISSN： 0960-8524
年卷期： 2020 年 300 卷
页码：
收录情况： SCI
摘要： Microbially-aged hydrochar were prepared to investigate how aging affected their ability to remove Cd2+ from aqueous solutions. Based on aging time in an anaerobic fermenter, four samples were produced: HC, M20-HC, M40-HC, and M60-HC. Results indicated increases in specific surface area, pH, and negative charge on hydrochar surface with aging process. Also, there were a decrease in O/C and an increase in surface functional groups, such as -COOH. The adsorption experiments confirmed the positive correlation between aging time and adsorption performance. The 60-day-aged M60-HC treatment displayed the maximum adsorption capacity, which was 3.8 times higher than that of HC. The Langmuir and pseudo-second-order kinetic equations fitted well with isothermal and kinetic data, respectively. Thermodynamic study indicated that Cd(2+ )adsorption is dominated by chemisorption. This study showed that microbial aging process is an effective and promising measure to improve hydrochar adsorption capacity for Cd2+.
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