期刊
BIORESOURCE TECHNOLOGY
卷 272, 期 -, 页码 114-122出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.09.138
关键词
Heavy metal; Biochar; Adsorption characteristics; Adsorption mechanisms
资金
- National Key Research and Development Program of China [2017YFD0801000]
- National Natural Science Foundation of China [41501338]
- Natural Science Foundation of Guangdong Province [2014A030310320, 2017A030313177]
Qualitative and quantitative characterization of Cd2+ adsorption mechanisms was performed with rice-straw and sewage-sludge biochars produced at different temperature (300-700 degrees C), respectively. The pH effect, adsorption kinetics and isotherms were investigated, and chemical analyses of Cd2+-loaded biochars were conducted by SEM-EDS, XRD, FTIR and Boehm titration. This demonstrated that rice-straw biochars (RSBs) have greater adsorption capacities for Cd2+ than sewage-sludge biochars (SSBs), which was mainly due to precipitation and cation exchange mechanisms, with their contribution proportion to total adsorption from 76.1% to 80.8%. While in SSBs, both mechanisms were overshadowed by coordination with p electrons mechanism accounting for 59.2%-62.9% of total adsorption, even the role of cation exchange was negligible in the adsorption mechanisms accounting for 2.3%-6.7%. The relationship of each mechanism with biochar's properties were discussed, which further deepen our understanding of adsorption on biochars. These results suggest RSBs have great potential for removing Cd2+ from aqueous solutions.
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