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The removal of arsenic from solution through biochar-enhanced precipitation of calcium-arsenic derivatives.
Zama, Eric F; Li, Gang; Tang, Yu-Ting; Reid, Brian J; Ngwabie, Ngwa M; Sun, Guo-Xin.
Afiliação
  • Zama EF; College of Technology, Department of Agricultural and Environmental Engineering, University of Bamenda, P.O. Box 39, Bambili, Cameroon; Zhejiang Key Lab of Urban Environmental Processes and Pollution Control, Ningbo Urban Environmental Observatory and Research Station, Chinese Academy of Science, Ni
  • Li G; Zhejiang Key Lab of Urban Environmental Processes and Pollution Control, Ningbo Urban Environmental Observatory and Research Station, Chinese Academy of Science, Ningbo, 361021, China.
  • Tang YT; School of Geographical Science, Faculty of Science and Engineering, University of Nottingham, Ningbo China, 315100, Ningbo, China.
  • Reid BJ; School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.
  • Ngwabie NM; College of Technology, Department of Agricultural and Environmental Engineering, University of Bamenda, P.O. Box 39, Bambili, Cameroon.
  • Sun GX; State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China. Electronic address: gxsun@rcees.ac.cn.
Environ Pollut ; 292(Pt A): 118241, 2022 Jan 01.
Article em En | MEDLINE | ID: mdl-34582918
Arsenic (As) pollution remains a major threat to the quality of global soils and drinking water. The health effects of As pollution are often severe and have been largely reported across Asia and South America. This study investigated the possibility of using unmodified biochar derived from rice husk (RB) and aspen wood (WB) at 400 °C and 700 °C to enhance the precipitation of calcium/arsenic compounds for the removal of As(III) from solution. The approach was based on utilizing calcium to precipitate arsenic in solution and adding unmodified biochar to enhance the process. Using this approach, As(III) concentration in aqueous solution decreased by 58.1% when biochar was added, compared to 25.4% in the absence of biochar. Varying the pH from acidic to alkaline enabled an investigation into the pH dependent dynamics of the approach. Results indicated that significant precipitation was only possible at near neutral pH (i.e. pH = 6.5) where calcium arsenites (i.e. Ca(AsO2)2, and CaAsO2OH•½H2O) and arsenates (i.e. Ca5(AsO4)3OH) were precipitated and deposited as aggregates in the pores of biochars. Arsenite was only slightly precipitated under acidic conditions (pH = 4.5) while no arsenite was precipitated under alkaline conditions (pH = 9.5). Arsenite desorption from wood biochar was lowest at pH 6.5 indicating that wood biochar was able to retain a large quantity of the precipitates formed at pH 6.5 compared to pH 4.5 and pH 9.5. Given that the removal of As(III) from solution is often challenging and that biochar modification invites additional cost, the study demonstrated that low cost unmodified biochar can be effective in enhancing the removal of As(III) from the environment through Ca-As precipitation.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Arsênio Idioma: En Revista: Environ Pollut Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2022 Tipo de documento: Article País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Arsênio Idioma: En Revista: Environ Pollut Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2022 Tipo de documento: Article País de publicação: Reino Unido