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. 2020 Dec:260:127555.
doi: 10.1016/j.chemosphere.2020.127555. Epub 2020 Jul 9.

As(III) removal from aqueous solution by katoite (Ca3Al2(OH)12)

Lin Sha  1 , Zhemin Zou  1 , Jun Qu  2 , Xinfei Li  1 , Yiyi Huang  1 , Chenjie Wu  1 , Zhigao Xu  3
Affiliations

As(III) removal from aqueous solution by katoite (Ca3Al2(OH)12)

Lin Sha et al. Chemosphere. 2020 Dec.

Abstract

As (III) is widely distributed in groundwater which is relatively harder to be removed comparing to As (V). Co-grinding Ca(OH)2 with Al(OH)3 was conducted to manufacture katoite (Ca3Al2(OH)12) for the complete removal of As(III) (concentration below drinking water standard of WHO (<10 ppb)) during one-step agitation operation. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), and X-ray photoelectron spectroscopy (XPS) were applied for the illustration of adsorption mechanism. Katoite could intercalate As(III) into the layered space forming arsenite pillared Ca-Al layered double hydroxide (LDH). The coexisting anions such as Cl-, SO42-, and NO3- had minor effects on As (III) removal performance using katoite. Techno-economic analysis demonstrated the feasibility of large-scale katoite production and its practical application for As(III) polluted groundwater purification, especially in the undeveloped areas where groundwater was used as irrigation and drinking water.

Keywords: Arsenite; Ball milling; Intercalation; Katoite.

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Conflict of interest statement

Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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