Efficient and selective removal of SeVI and AsV mixed contaminants from aqueous media by montmorillonite-nanoscale zero valent iron nanocomposite

JOURNAL OF HAZARDOUS MATERIALS

卷:403

Article

Suazo-Hernandez, Jonathan^1,2  Manquian-Cerda, Karen³  de la Luz Mora, Maria^2,4  Molina-Roco, Mauricio⁵  Angelica Rubio, Maria^3,6  Sarkar, Binoy⁷  Bolan, Nanthi⁸  Arancibia-Miranda, Nicolas^3,6 

[1] Univ La Frontera, Programa Doctorado Ciencias Recursos Nat, Av Francisco Salazar 01145,POB 54-D, Temuco, Chile

[2] Univ La Frontera, Ctr Plant Soil Interact & Nat Resources Biotechno, UFRO, Temuco 4780000, Chile

[3] Univ Santiago Chile, Fac Quim & Biol, Av B OHiggins, Santiago 3363, Chile

[4] Univ La Frontera, Dept Ciencias Quim & Recursos Nat, Av Francisco Salazar 01145,POB 54-D, Temuco, Chile

[5] Agriserv Res Lab, Rinconada 9139,CP 7650208, Santiago, Chile

[6] CEDENNA, Ctr Dev Nanosci & Nanotechnol, Santiago 9170124, Chile

[7] Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England

[8] Univ Newcastle, Global Ctr Environm Remediat, Callaghan, NSW 2308, Australia

关键词: NZVI;    Water treatment;    Arsenic and selenium removal;    Competitive adsorption;    Partition coefficient;   

DOI  :  10.1016/j.jhazmat.2020.123639

来源: Elsevier

【 摘 要 】

Nanoscale zero-valent iron (NZVI) and NZVI supported onto montmorillonite (NZVI-Mt) were synthetized and used in this study to remove Se-VI and As-V from water in monoand binary-adsorbate systems. The adsorption kinetics and isotherm data for Se-VI and As-V were adequately described by the pseudo-second-order (PSO) (r(2)>0.94) and Freundlich (r(2)>0.93) equations. Results from scanning electron microscopy showed that the dimension of the NZVI immobilized on the Mt was smaller than pure NZVI. Using 0.05 g of adsorbent and an initial 200 mg L-1 As-V and Se-VI concentration, the maximum adsorption capacity (q(max)) and partition coefficient (PC) for As-V on NZ(VI)-Mt in monocomponent system were 54.75 mg g(-1) and 0.065 mg g(-1).mu M-1, which dropped respectively to 49.91 mg g(-1) and 0.055 mg g(-1).mu M-1 under competitive system. For Se-VI adsorption on NZ(VI)-Mt in monocomponent system, q(max) and PC were 28.63 mg g(-1) and 0.024 mg g(-1).mu M-1, respectively. Values of q(max) and PC were higher for NZVI-Mt than NZVI and montmorillonite, indicating that the nanocomposite contained greater adsorption sites for removing both oxyanions, but with a marked preference for As-V. Future research should evaluate the effect of different operational variables on the removal efficiency of both oxyanions by NZVI-Mt.

【 授权许可】

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