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Comparison of two carbonaceous supported Fe-rich adsorbents for arsenate removal: A functionalisation and mechanistic study with applicability to groundwater treatment.
Pap, Sabolc; Turk Sekulic, Maja; Tran, Hai Nguyen; Chao, Huan-Ping; Gilbert, Peter J; Gibb, Stuart W; Taggart, Mark A.
Afiliación
  • Pap S; Environmental Research Institute, UHI North, West and Hebrides, University of the Highlands and Islands, Thurso, Scotland, KW14 7JD, UK; Department of Environmental Engineering and Occupational Safety and Health, Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, Novi
  • Turk Sekulic M; Department of Environmental Engineering and Occupational Safety and Health, Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, Novi Sad, Serbia.
  • Tran HN; Center for Energy and Environmental Materials, Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh, 700000, Viet Nam; Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang, 550000, Viet Nam.
  • Chao HP; Department of Environmental Engineering, Chung Yuan Christian University, Taoyuan, 32023, Taiwan; Center for Environmental Risk Management, Chung Yuan Christian University, Taoyuan, 32023, Taiwan.
  • Gilbert PJ; Environmental Research Institute, UHI North, West and Hebrides, University of the Highlands and Islands, Thurso, Scotland, KW14 7JD, UK.
  • Gibb SW; Environmental Research Institute, UHI North, West and Hebrides, University of the Highlands and Islands, Thurso, Scotland, KW14 7JD, UK.
  • Taggart MA; Environmental Research Institute, UHI North, West and Hebrides, University of the Highlands and Islands, Thurso, Scotland, KW14 7JD, UK.
Chemosphere ; 359: 142205, 2024 Jul.
Article en En | MEDLINE | ID: mdl-38704050
ABSTRACT
The presence of arsenic in groundwater, and through this in drinking water, has been shown to present a serious risk to public health in many regions of the world. In this study, two iron-rich carbonous adsorbents were compared for the removal of arsenate (As(V)) from groundwater. Biochars (FeO-biochar and FeO-pyrochar) derived from biomass waste were functionalised in two different ways with iron chloride for comparation. Batch and dynamic parameters were optimised to achieve >99% As(V) removal efficiency. Experimental data were best described by the pseudo-second order kinetic model, while multi-stage diffusion appeared to limit mass transfer of As(V). Among the isotherm models evaluated, the Freundlich model best described the experimental results with high correlation coefficients (R2 ≥ 0.94) for both adsorbents. Monolayer adsorption capacities were found to be 4.34 mg/g and 8.66 mg/g for FeO-biochar and FeO-pyrochar, respectively. Batch studies followed by instrumental characterisation of the materials indicated the removal mechanisms involved to be electrostatic interactions (outer-sphere), OH- ligand exchange (inner-sphere complexation) and hydrogen bonding with functional groups. Higher pHpzc (9.1), SBET (167.2 m2/g), and iron/elemental content for the FeO-pyrochar (compared with the FeO-biochar) suggested that both surface chemistry and porosity/surface area were important in adsorption. Dynamic studies showed FeO-pyrochar can be used to remove As(V) from groundwater even at low 'environmental' concentrations relevant to legislative limits (<10 µg/L), whereby 7 g of FeO-pyrochar was able to treat 5.4 L groundwater.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Arseniatos / Contaminantes Químicos del Agua / Agua Subterránea / Carbón Orgánico / Purificación del Agua / Hierro Idioma: En Revista: Chemosphere Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Arseniatos / Contaminantes Químicos del Agua / Agua Subterránea / Carbón Orgánico / Purificación del Agua / Hierro Idioma: En Revista: Chemosphere Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido