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- W2297153977 abstract "Biochars prepared from biogas residue using different chemical activators were investigated for their As(III) adsorption properties. The results indicated that the original biochars did not exhibit significant As(III) adsorption. However, ZnCl2-activated biochar, which possessed the largest specific surface area, 516.67 cm2/g, and exhibited a perfectly porous texture, showed excellent performance in a 500 μgL−1 solution of As(III). Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy were utilized to identify the mechanism of As(III) adsorption by ZnCl2-activated biochar. Adsorption was found to occur mainly through ligand exchange of the hydroxyl in Zn-OH to form Zn-O-As(III), as well as through porous adsorption. As a low-cost adsorbent, the adsorption process was well fitted using a pseudo-second-order model, with an R2 > 0.993. The adsorption process was fast, requiring nearly 90 min to reach adsorption equilibrium. Batch adsorption experimental results indicated that ZnCl2-activated biochar has a maximum adsorption capacity of 27.67 mg/g at pH 7.0, and the adsorption process followed the Freundlich isotherm model well, with an R2 > 0.994. In addition, the current work demonstrated the efficiency of using ZnCl2-activated biochar adsorbent to treat As(III)-contaminated water." @default.
- W2297153977 created "2016-06-24" @default.
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- W2297153977 date "2016-07-01" @default.
- W2297153977 modified "2023-10-18" @default.
- W2297153977 title "ZnCl 2 -activated biochar from biogas residue facilitates aqueous As(III) removal" @default.
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- W2297153977 doi "https://doi.org/10.1016/j.apsusc.2016.03.109" @default.
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