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• W3120443279 abstract "Adsorption characteristics of Cd 2+ on the three biochars modified by pyrolysis and calcination were investigated that were derived from rice straw (TRSB), chicken manure (TCMB) and sewage sludge (TSSB). The pH effect, adsorption kinetics, isotherms and thermodynamics, and desorption were determined, and qualitative analysis of adsorption mechanisms was performed by SEM, XRD, FTIR and XPS. Maximum adsorption capacities reached 177.28, 96.03 and 74.04 mg/g for TCMB, TRSB and TSSB, respectively, which were higher than that of many previously reported biochars. Even after five adsorption-desorption cycles, TCMB showed the strongest reusability without losing significantly adsorption capacity. This suggested that thermally modified biochars, particularly TCMB, could be a preferred adsorbent for Cd 2+ . Relative distribution of adsorption mechanisms was examined by direct and indirect calculation, in which the precipitation and cation-exchange dominated the whole chemisorption process, jointly accounting for 84% (TRSB) to 95% (TCMB) of total adsorption. While the complexation was of minor importance in total adsorption accounting for 5%–16%. The relationship of each mechanism with the properties of biochar was also discussed. These provided new insights on the adsorption effectiveness and mechanisms for Cd 2+ in the aqueous solution that was critical for evaluating the application of modified biochars. • Thermal treatment is a simple and effective way for improving biochar’s adsorption. • Adsorption mechanisms were characterized qualitatively and quantitatively. • Biochars have 58.2% of total adsorbed Cd 2+ due to precipitation. • Biochars have 30.4% of total adsorbed Cd 2+ attributed to cation-exchange. • Thermally modified biochar can act as efficient adsorbent for removing Cd 2+ ." @default.
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• W3120443279 date "2021-06-01" @default.
• W3120443279 modified "2023-10-16" @default.
• W3120443279 title "High-efficiency removal capacities and quantitative adsorption mechanisms of Cd2+ by thermally modified biochars derived from different feedstocks" @default.
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• W3120443279 doi "https://doi.org/10.1016/j.chemosphere.2021.129594" @default.
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