Enhanced adsorption of aqueous Pb(II) by modified biochar produced through pyrolysis of watermelon seeds

文献类型： 外文期刊

第一作者： Ahmed, Waqas

作者： Ahmed, Waqas;Mehmood, Sajid;Chen, Di-Yun;Ahmed, Waqas;Mehmood, Sajid;Chen, Di-Yun;Nunez-Delgado, Avelino;Ali, Sehrish;Qaswar, Muhammad;Shakoor, Awais;Mahmood, Mohsin

作者机构：

关键词： Lead remediation; Pyrolysis; Adsorption; Heavy metal; Sustainable remediation; Wastewater treatment

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 784 卷

页码：

收录情况： SCI

摘要： A biochar (BC) was obtained by the pyrolysis of watermelon seeds (WM) in nitrogen environment. In addition, a modified biochar (HP-BC) was obtained by means of H2O2 treatment of BC. Later on, both kinds of biochar (BC and HP-BC) were characterized and compared as regards their potential for Pb(II) adsorption 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). Pb(II) adsorption characteristics for HP-BC and BC as were evaluated as a function of solution pH, contact time and Pb(II) equilibrium concentration, using kinetic and thermodynamic studies, as well as adsorption isotherms. Regarding kinetics, the pseudo-second order model showed good fitting to experimental data. Based on the Langmuir model, the maximum Pb(II) adsorption capacities were calculated as 44.32 mg g(-1) and 60.87 mg g(-1) for BC and HP-BC, respectively. Thermodynamic study indicated that Pb(II) adsorption onto BC and HP-BC was spontaneous and primarily governed by chemisorption and surface complexation. In view of the results, the H2O2 modification of the watermelon seeds biochar can be considered as a promising and cost effective approach as regards Pb(II) removal from water/wastewater, which would not cause adverse impacts on the surrounding environments. Overall, it can be seen as a procedure promoting the effective recycling of a waste/by-product, in line of the precepts of the circular economy, aiding to protect human and environmental health. (C) 2021 Elsevier B.V. All rights reserved.

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