Novel co-doped iron oxide and graphitic carbon nanosheets on biochar for arsenite removal from contaminated water: Synthesis, applicability and mechanism. (February 2022)

• Record Type: Journal Article
• Authors: Van Thinh, Nguyen; Yusuke, Shiratori; Tu, Phuc Hoan; Kuwahara, Yoshihiro
• Is Part Of: Bioresource technology reports. Volume 17(2022)
• Publication Date: 2022-02
• Subjects: Arsenic removal -- α-Fe2O3 doped composite -- Graphitic carbon nanosheets -- Biochar -- Groundwater contamination -- Arsenite oxidation; Biomass energy -- Periodicals; Biotransformation (Metabolism) -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Waste products as fuel -- Periodicals; Waste products as fuel; Organic wastes; Factory and trade waste; Biotransformation (Metabolism); Biomass energy; Agricultural wastes; Periodicals; Electronic journals; 662.88
• DOI: 10.1016/j.biteb.2021.100929
• Languages: English
• ISSNs: 2589-014X

Abstract

Abstract: Arsenite (As III ) is the most toxic form of arsenic in drinking water, but As III removal is still a challenge. In this study, α-Fe2 O3 -doped graphitic carbon nanosheets were coated on the surfaces of coconut biochar backbone to remove As III from contaminated water. The properties of the composites and the efficiency of As III treatment were measured by modern techniques and methods, such as XPS, SEM-EDS, ICP–MS, BET analyses. The novel composites enhance As III removal capacity by up to 99.85%, and exhibited high effectiveness for As III removal over a large pH range from 3 to 9. In addition, XPS analysis revealed that the FeCl3 -derived composites have the ability to oxidize As III into As V species on the composite surfaces due to its catalytic properties. The novel composites can be considered adsorbents that can treat a large As III concentration range to obtain safe aqueous As levels according to the WHO guidelines for drinking water. Graphical abstract: Unlabelled Image Highlights: Novel α-Fe2 O3 /carbon nanosheets were successfully coated on biochar surface. The FeCl3 -derived composite could oxidize As III to As V on its surface. The novel composites show high effectiveness for As III removal (up to 99.85%). The α-Fe2 O3 /carbon nanosheets maintained an important role in As III removal. The composites worked well over a large range of pH values and As concentrations.