Synthesis, characterization, and property test of crystalline polyferric sulfate adsorbent used in treatment of contaminated water with a high As(III) content

Ping-chao Ke; Zhi-hong Liu; Lin Li

doi:10.1007/s12613-018-1674-8

Volume 25 Issue 10

Oct. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(10): 1217-1225

Ping-chao Ke, Zhi-hong Liu, and Lin Li, Synthesis, characterization, and property test of crystalline polyferric sulfate adsorbent used in treatment of contaminated water with a high As(III) content, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1217-1225. https://doi.org/10.1007/s12613-018-1674-8

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Ping-chao Ke, Zhi-hong Liu, and Lin Li, Synthesis, characterization, and property test of crystalline polyferric sulfate adsorbent used in treatment of contaminated water with a high As(III) content, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1217-1225. https://doi.org/10.1007/s12613-018-1674-8

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Research Article

Synthesis, characterization, and property test of crystalline polyferric sulfate adsorbent used in treatment of contaminated water with a high As(III) content

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Corresponding author:
Zhi-hong Liu E-mail: zhliu@csu.edu.cn
Received: 2 March 2018; Revised: 25 April 2018; Accepted: 12 June 2018

Abstract

Abstract

A crystalline polyferric sulfate (PFS) adsorbent was synthesized by oxidizing and precipitating ferrous ions in air atmospheric conditions. The morphology, structure, specific surface area (SSA), and adsorptive efficacy of the adsorbent to As(Ⅲ) were characterized by scanning electron microscope (SEM) and transmission electron microscopy (TEM) images, X-ray diffraction (XRD) patterns, Fourier-transform infrared (FTIR) spectra, BET SSA analyses, and adsorption experiments. The adsorbent showed a near-spherical aggregate structure and had good crystallinity. A significant amount of α-goethite co-precipitated with PFS in the case of the initial ferrous concentration of 1 mol/L and increased SSA of the adsorbent. The stability region of ferric compounds in the process was drawn and applied to analyze the iron behavior during the synthesis. The adsorption of As(Ⅲ) in high As(Ⅲ)-containing solutions fitted the Langmuir isotherm model adequately. The absorbent with co-precipitation of α-goethite showed good adsorbability for As(Ⅲ) and good filtering performance in the high As(Ⅲ)-containing solution of 10-100 mg/L under acidic, neutral, and alkaline conditions (pH 2.09-9.01). After the adsorption process, the stability of the residues bearing As(Ⅲ) was evaluated by toxic characteristic leaching procedure (TCLP) tests. The results indicated that the residues were extremely stable, and the concentrations of arsenic in the leaching solutions were less than 0.01 mg/L.
- polyferric sulfate;
- crystal structure;
- α-goethite;
- high As(III)-containing contaminated water;
- wide pH range;
- As(III) adsorption

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