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As(III) removal from aqueous solution by katoite (Ca 3 Al 2 (OH) 12 ).

Authors :: Sha L
Zou Z
Qu J
Li X
Huang Y
Wu C
Xu Z
Source :: Chemosphere [Chemosphere] 2020 Dec; Vol. 260, pp. 127555. Date of Electronic Publication: 2020 Jul 09.
Publication Year :: 2020
Abstract: As (III) is widely distributed in groundwater which is relatively harder to be removed comparing to As (V). Co-grinding Ca(OH) <subscript>2</subscript> with Al(OH) <subscript>3</subscript> was conducted to manufacture katoite (Ca <subscript>3</subscript> Al <subscript>2</subscript> (OH) <subscript>12</subscript> ) 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 <superscript>-</superscript> , SO <subscript>4</subscript> <superscript>2-</superscript> , and NO <subscript>3</subscript> <superscript>-</superscript> 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.<br />Competing Interests: 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.<br /> (Copyright © 2020 Elsevier Ltd. All rights reserved.)