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, Y; Zheng, XB; Xue, LH; Han, LF; He, SY; Mishra, T; Feng, YF; Yang, LZ; Xing, BS
作者机构:
关键词: Sawdust Hydrochar; Microbially Aged Process; Cadmium; Adsorption Mechanisms; Biochar Aging
期刊名称: BIORESOURCE TECHNOLOGY
ISSN: 0960-8524
年卷期: 2020 年 300 卷
页码:
收录情况: JCR(2021版) ; EI(2021版)
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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