Sythesis of Nano Zerovalent Iron Supported Sawdust (NZVI/SD) and Its Application for Removal of Arsenic (III) from Aqueous Solution

Abstract

Sawdust supported nano-zerovalent (NZVI/SD) iron was synthesized by treating sawdust with ferrous sulphate followed by reduction with NaBH 4 . The NZVI/SD was characterized by SEM, XRD, FTIR and Chemical method. Adsorption of As (III) by NZVI/SD was investigated and the maximum uptake of As (III) was found at pH value of 7.74 and equilibrium time of 3 hrs. The adsorption isotherm modelling revealed that the equilibrium adsorption data were better fitted with the Choudhury et al.; CSIJ, 29(1): 1-12, 2020; Article no.CSIJ.54285 2 Langmuir isotherm model compared with the Freundlich Isotherm model. This study revealed that the maximum As (III) ions adsorption capacity was found to be 12.66 mg/g for using NZVI/SD adsorbent. However, the kinetics data were tested by pseudo-first-order and pseudo-second-order kinetic models; and it was observed that the adsorption data could be well fitted with pseudosecond-order kinetics for As (III) adsorption onto NZVI/SD depending on both adsorbate concentration and adsorption sites. The result of this study suggested that NZVI/SD could be developed as a prominent environment-friendly adsorbent for the removal of As (III) ions from aqueous systems. Original Research Article

Modification and Application of Albizia lebbeck Sawdust For The Sorption of Lead(II) and Copper(II) From Aqueous Solutions

“…Few research groups adopted treatment method using formaldehyde in sulfuric acid to enhance the adsorption capacity of sawdust but ended with poor results [29][30][31] . Recently we observed that sawdust impregnated with nano-zerovalent iron showed significant sorption of As(III) from aqueous solution 32 . Other recent studies showed that sawdust 33 , nano-sawdust 34 , sawdust-kaolinite composite 35 could be used as adsorbents for heavy metals.…”