Biochar heavy metal removal in aqueous solution depends on feedstock type and pyrolysis purging gas

文献类型： 外文期刊

第一作者： Islam, Md Shahinoor

作者： Islam, Md Shahinoor;Kwak, Jin-Hyeob;Nzediegwu, Christopher;Wang, Siyuan;Naeth, M. Anne;Chang, Scott X.;Kwak, Jin-Hyeob;Wang, Siyuan;Palansuriya, Kumuduni;Ok, Yong Sik;Kwon, Eilhann E.;El-Din, Mohamed Gamal

作者机构：

关键词： Adsorption isotherms; Adsorption kinetics; Intraparticle diffusion model; Paper mill sludge biochar; Pyrolysis; Rice straw

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2021 年 281 卷

页码：

收录情况： SCI

摘要： The effectiveness of biochar as a sorptive material to remove contaminants, particularly heavy metals, from water is dependent on biomass type and pyrolysis condition. Biochars were produced from pulp mill sludge (PMS) and rice straw (RS) with nitrogen (N-2) or carbon dioxide (CO2) as the purging gas. The sorptive capacity of the biochars for cadmium(II), copper(II), nickel(II) and lead(II) was studied. The heavy metal adsorption capacity was mainly affected by biomass type, with biochars adsorption capacities higher for lead(II) (109.9-256.4 mg g(-1)) than for nickel(II) (40.2-64.1 mg g(-1)), cadmium(II) (29.5-42.7 mg g(-1)) and copper(II) (18.5-39.4 mg g(-1)) based on the Langmuir adsorption model. The highest lead(II) adsorption capacities for PMS and RS biochars were 256.4 and 133.3 mg g(-1), respectively, when generated using N-2 as the purging gas. The corresponding lead(II) adsorption capacities were 250.0 and 109.9 mg g(-1), respectively, when generated using CO2 as the purging gas. According to the intraparticle diffusion model, 30-62% of heavy metal adsorption was achieved in 1 h; film diffusion was the rate-dominating step, whereas pore diffusion was a rate-limiting step. Ion exchange and complexation between heavy metals and biochar surface functional groups such as carbonyl and hydroxyl groups were effective mechanisms for heavy metal sorption from the aqueous solution. We conclude that proper selection of both the feedstock type and the purging gas is important in designing biochars for the effective removal of potentially toxic metals from wastewater. (C) 2021 Elsevier Ltd. All rights reserved.

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