Adsorption of Pb(II) from wastewater using a red mud modified rice-straw biochar: Influencing factors and reusability

文献类型： 外文期刊

第一作者： Ahmed, Waqas

作者： Ahmed, Waqas;Mehmood, Sajid;Mahmood, Mohsin;Zhao, Hongwei;Liu, Wenjie;Li, Weidong;Ahmed, Waqas;Mehmood, Sajid;Mahmood, Mohsin;Zhao, Hongwei;Liu, Wenjie;Li, Weidong;Ali, Sehrish;Shakoor, Awais;Nunez-Delgado, Avelino;Asghar, Rana Muhammad Ammar

作者机构：

关键词： Adsorption; Engineered biochar; Environmental remediation; Toxic chemicals; Wastewater treatment; Removal mechanisms

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.9； 五年影响因子：9.5 ）

ISSN： 0269-7491

年卷期： 2023 年 326 卷

页码：

收录情况： SCI

摘要： Efficient environmental remediation of toxic chemicals using effective sorbents has received considerable attention recently. For the present study, the synthesis of a red mud/biochar (RM/BC) composite was performed from rice straw with the aim of achieving Pb(II) removal from wastewater. Characterization was performed by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), energy dispersive spectroscopy (EDS), Zeta potential analysis, elemental mapping, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Results showed that RM/BC had higher specific surface area (S-BET = 75.37 m(2) g(-1)) than raw biochar (S-BET = 35.38 m(2) g(-1)). The Pb(II) removal capacity (q(e)) of RM/BC was 426.84 mg g(-1) at pH 5.0, and the adsorption data well fitted pseudo second order kinetics (R-2 = 0.93 and R-2 = 0.98), as well as the Langmuir isotherm model (R-2 = 0.97 and R-2 = 0.98) for both BC and RM/BC. Pb(II) removal was slightly hindered with the increasing strength of co-existing cations (Na+, Cu2+, Fe3+, Ni2+, Cd2+). The increase in temperatures (298 K, 308 K, 318 K) favored Pb(II) removal by RM/BC. Thermodynamic study indicated that Pb (II) adsorption onto BC and RM/BC was spontaneous and primarily governed by chemisorption and surface complexation. A regeneration study revealed the high reusability (>90%) and acceptable stability of RM/BC even after five successive cycles. These findings indicate that RM/BC evidenced special combined characteristics of red mud and biochar, hence its use for Pb removal from wastewater offers a green and environmentally sustainable approach fitting the "waste treating waste" concept.

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