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oai:recercat.cat:10256/119502024-06-18T13:50:42Zcom_2072_452955com_2072_2054col_2072_453073

2024-06-18T13:50:42Z urn:hdl:10256/11950 Montmorillonite-supported nanoscale zero-valent iron for removal of arsenic from aqueous solution: Kinetics and mechanism Bhowmick, Subhamoy Chakraborty, Sudipta Mondal, Priyanka Renterghem, Wouter van Van Den Berghe, Sven‏ Román-Ross, Gabriela Chatterjee, Debashis Iglesias Juncà, Mònica Aigües subterrànies -- Depuració Groundwater -- Purification Arsènic Arsenic Aigües subterrànies -- Contaminació Groundwater -- Pollution Montmorillonite-supported nanoscale zero-valent iron (Mt-nZVI) has been synthesized to remove inorganic arsenic (As) from aqueous solutions. BET, SEM, EDX, XRD and XPS were used to characterize the clay-supported material which consists mainly of core shell Fe(0) structure with an outer oxide/hydroxide shell. The dispersion of nZVI onto montmorillonite was found to be increased with decreasing tendency to agglomerate into larger particles. Batch experiments revealed that adsorption kinetics followed pseudo-second order rate equation with high affinity towards both As(III) and As(V) over a wide pH range (4-8) which was decreased at pH>9. The maximum adsorption capacity calculated from the Langmuir adsorption isotherm was found to be 59.9 and 45.5mgg-1 for As(III) and As(V) respectively at pH 7.0. Although the presence of competing anions like SO42-, HCO3- and NO3- did not show pronounced effect, PO43- had an inhibitory action on the adsorption. The XPS analyses of As-reacted Mt-nZVI indicated the occurrence of surface catalyzed oxidation of As(III) to As(V). The possible regeneration using 0.1M NaOH and performance of Mt-nZVI was investigated by repeating adsorption-elution process. This study has great significance for demonstrating Mt-nZVI as potential adsorbent to reduce elevated levels of As in groundwater panish National Research Programme supported this work through Project CGL2010-22168-C03-03 2024-06-18T13:50:42Z 2024-06-18T13:50:42Z info:eu-repo/date/embargoEnd/2026-01-01 info:eu-repo/date/embargoEnd/2026-01-01 2014-05-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/10256/11950 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cej.2013.12.049 info:eu-repo/semantics/altIdentifier/issn/1385-8947 info:eu-repo/grantAgreement/MICINN//CGL2010-22168-C03-02/ES/APLICACION DE AGUA NO CONVENCIONAL (TRATADA-DESALADA) Y FANGOS PROCEDENTES DE DEPURADORAS URBANAS Y SU IMPACTO EN EL MEDIO ACUIFERO Y SUELOS. ETUDIOS DE CAMPOY LABORATORIO/ Tots els drets reservats info:eu-repo/semantics/embargoedAccess Elsevier © Chemical Engineering Journal, 2014, vol. 243, p. 14-23 Articles publicats (D-Q)