期刊
CHEMOSPHERE
卷 260, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.127555
关键词
Arsenite; Intercalation; Katoite; Ball milling
资金
- National Natural Science Foundation of China [51904358, 51734001]
- Natural Science Foundation of Hubei Province [2019CFB267]
- Fundamental Research Funds for the Central Universities of South-central University [CZP19002, YZZ16002, CZD20007]
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. (C) 2020 Elsevier Ltd. All rights reserved.
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