DOI: 10.1016/j.watres.2018.03.021
Scopus记录号: 2-s2.0-85046022505
论文题名: Arsenic sorption on zero-valent iron-biochar complexes
作者: Bakshi S. ; Banik C. ; Rathke S.J. ; Laird D.A.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 137 起始页码: 153
结束页码: 163
语种: 英语
英文关键词: Arsenic
; Biochar
; Co-precipitation
; Contaminated drinking water
; Pyrolysis
; Zero valent iron
Scopus关键词: Arsenic
; Arsenic compounds
; Charge density waves
; Coprecipitation
; Ion exchange
; Iron compounds
; Iron ores
; Magnetite
; Potable water
; Pyrolysis
; Sorption
; Batch-equilibration
; Bio chars
; Contaminated drinking water
; Economically viable
; High-temperature pyrolysis
; Isomorphous substitutions
; Modification methods
; Zero-valent iron
; Water treatment
; activated carbon
; arsenic
; biochar
; iron
; unclassified drug
; arsenic
; biochar
; charcoal
; drinking water
; iron
; magnetite
; arsenic
; biochar
; complexity
; drinking water
; iron nanoparticle
; oxidation
; pollutant removal
; precipitation (chemistry)
; pyrolysis
; separation
; sorption
; toxic substance
; Article
; biomass
; energy dispersive X ray spectroscopy
; leaching
; oxidation
; pH
; precipitation
; priority journal
; pyrolysis
; scanning electron microscopy
; surface property
; X ray diffraction
; Bangladesh
; chemistry
; India
; procedures
; water management
; water pollutant
; Bangladesh
; India
; Arsenic
; Bangladesh
; Charcoal
; Drinking Water
; Ferrosoferric Oxide
; India
; Iron
; Water Pollutants, Chemical
; Water Purification
英文摘要: Arsenic (As) is toxic to human and is often found in drinking water in India and Bangladesh, due to the natural abundance of arsenides ores. Different removal procedures such as precipitation, sorption, ion exchange and membrane separation have been employed for removal of As from contaminated drinking water (CDW), however, there is a critical need for low-cost economically viable biochar modification methods which can enhance As sorption. Here we studied the effectiveness of zero-valent iron (ZVI)-biochar complexes produced by high temperature pyrolysis of biomass and magnetite for removing As5+ from CDW. Batch equilibration and column leaching studies show that ZVI-biochar complexes are effective for removing As5+ from CDW for the studied pH range (pH ∼7–7.5) and in the presence of competing ions. XPS As 3d analysis of ZVI-biochar complexes exposed to As5+ in the batch and column studies show primarily As3+, indicating simultaneous oxidation of Fe° to Fe3+ and reduction of As5+ to As3+. SEM-EDS and XRD analyses show isomorphous substitution of As3+ for Fe3+ in neo-formed α/γ-FeOOH on biochar surfaces, which is attribute to co-precipitation. This study also demonstrates the efficacy of pyrolyzing biomass with low-cost iron ores at 900 °C to rapidly produce ZVI-biochar complexes, which have potential to be used for treatment of As CDW. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112807
Appears in Collections: 气候减缓与适应
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作者单位: Department of Environmental Sciences, The Connecticut Agricultural Experiment Station, New Haven, CT 06511, United States; Department of Agronomy, Iowa State University, Ames, IA 50011, United States; Department of Soil, Water and Environmental Sciences, University of Arizona, Tucson, AZ 85721, United States
Recommended Citation:
Bakshi S.,Banik C.,Rathke S.J.,et al. Arsenic sorption on zero-valent iron-biochar complexes[J]. Water Research,2018-01-01,137