Superior removal of As(III) and As(V) from water with Mn-doped β-FeOOH nanospindles on carbon foam

JOURNAL OF HAZARDOUS MATERIALS

卷:418

Article

Yan, Bing^1,3  Liang, Tian²  Yang, Xiaohui²  Gadgil, Ashok J.³ 

[1] China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China

[2] China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Peoples R China

[3] Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA

关键词: Arsenic removal;    Monolith;    Manganese doping;    FeOOH;    Oxidation-adsorption;   

DOI  :  10.1016/j.jhazmat.2021.126347

来源: Elsevier

【 摘 要 】

Arsenic pollution of water is one of the severest environmental challenges threatening human health. Iron-based nanomaterials have been demonstrated effective in arsenic removal. However, they generally suffer from low removal efficiency towards highly toxic As(III), loss of active sites owing to agglomeration, and poor reusability. Herein, we report a carbonized melamine foam supported Mn(IV)-doped beta-FeOOH nanospindles(CF@Mn-FeOOH NSp) for tackling the technical hurdles. The designed CF@Mn-FeOOH NSp appears as a free-standing monolith through a low-cost and straightforward hydrothermal method. The atomic-scale integration of Mn(IV) into beta-FeOOH enables an oxidation-adsorption bifunctionality, where Mn(IV) serves as oxidizer for As(III) and Fe(III) acts as adsorber for As(V). The maximal adsorption capacity for As(V) and As(III) can reach 152 and 107 mg g-1, respectively. Meanwhile, As in simulated high arsenic groundwater can be decreased to below 10 mu g L-1 within 24 h. By simple filtrating-washing, 85% and 82% of its initial adsorption capacity for As(V) and As(III) can be easily recovered even after 5-cycles reuse. Kinetics and isotherm adsorption study indicate that the arsenic adsorption behavior is mainly through chemical bonding during single-layer adsorbing process. The as-prepared CF@Mn-FeOOH offers a scalable, efficient, and recyclable solution for arsenic removal in groundwater and wastewater from mines and industry.

【 授权许可】

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