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A mechanistic approach to arsenic adsorption and immobilization in aqueous solution, groundwater, and contaminated paddy soil using pine-cone magnetic biochar.
Ahmed Khan, Basit; Ahmad, Mahtab; Bolan, Nanthi; Farooqi, Abida; Iqbal, Sajid; Mickan, Bede; Solaiman, Zakaria M; Siddique, Kadambot H M.
Afiliación
  • Ahmed Khan B; Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan; The UWA Institute of Agriculture and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, 6001, Australia.
  • Ahmad M; Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan. Electronic address: mahmad@qau.edu.pk.
  • Bolan N; The UWA Institute of Agriculture and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, 6001, Australia.
  • Farooqi A; Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan.
  • Iqbal S; Department of Nuclear & Quantum Engineering, Korea Advance Institute of Science and Technology (KAIST), 291-Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea.
  • Mickan B; The UWA Institute of Agriculture and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, 6001, Australia.
  • Solaiman ZM; The UWA Institute of Agriculture and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, 6001, Australia.
  • Siddique KHM; The UWA Institute of Agriculture and UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, 6001, Australia.
Environ Res ; 245: 117922, 2024 Mar 15.
Article en En | MEDLINE | ID: mdl-38151150
ABSTRACT
Arsenic (As) poisoning in groundwater and rice paddy soil has increased globally, impacting human health and food security. There is an urgent need to deal with As-contaminated groundwater and soil. Biochar can be a useful remedy for toxic contaminants. This study explains the synthesis of pinecone-magnetic biochar (PC-MBC) by engineering the pinecone-pristine biochar with iron salts (FeCl3.6H2O and FeSO4.7H2O) to investigate its effects on As(V) adsorption and immobilization in water and soil, respectively. The results indicated that PC-MBC can remediate As(V)-contaminated water, with an adsorption capacity of 12.14 mg g-1 in water. Isotherm and kinetic modeling showed that the adsorption mechanism involved multilayer, monolayer, and diffusional processes, with chemisorption operating as the primary interface between As(V) and biochar. Post-adsorption analysis of PC-MBC, using FTIR and XRD, further revealed chemical fixing and outer-sphere complexation between As(V) and Fe, O, NH, and OH as the main reasons for As(V) adsorption onto PC-MBC. Recycling of PC-MBC also had excellent adsorption even after several regeneration cycles. Similarly, PC-MBC successfully immobilized As in paddy soil. Single and sequential extraction results showed the transformation of mobile forms of As to a more stable form, confirmed by non-destructive analysis using SEM, EDX, and elemental dot mapping. Thus, Fe-modified pine-cone biochar could be a suitable and cheap adsorbent for As-contaminated water and soil.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Arsénico / Contaminantes del Suelo / Contaminantes Químicos del Agua / Agua Subterránea / Carbón Orgánico Límite: Humans Idioma: En Revista: Environ Res Año: 2024 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Arsénico / Contaminantes del Suelo / Contaminantes Químicos del Agua / Agua Subterránea / Carbón Orgánico Límite: Humans Idioma: En Revista: Environ Res Año: 2024 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Países Bajos