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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

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

作者机构：

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

期刊名称： Environmental Pollution

ISSN： 0269-7491

年卷期： 2023 年 326 卷

页码：

收录情况： SCIE（2023版） ; ; EI（2023版）

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 (SBET = 75.37 m2 g−1) than raw biochar (SBET = 35.38 m2 g−1). The Pb(II) removal capacity (qe) of RM/BC was 426.84 mg g−1 at pH 5.0, and the adsorption data well fitted pseudo second order kinetics (R2 = 0.93 and R2 = 0.98), as well as the Langmuir isotherm model (R2 = 0.97 and R2 = 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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