Investigation of mechanism of heavy metals (Cr6+, Pb2+ Zn2+) adsorption from aqueous medium using rice husk ash: Kinetic and thermodynamic approach

Priya, A. K.; Yogeshwaran, V; Rajendran, Saravanan; Hoang, Tuan K. A.; Soto-Moscoso, Matias; Ghfar, Ayman A.; Bathula, Chinna

Abstract

In this work, we examined the possibility on the application of rice husk as biosorbent for the elimination of heavy metal ions (chromium, lead, and zinc) existing in the aqueous solutions. The biosorbent was prepared from rice husk powder and modified with 0.1 N of HCl for creating the functional groups and increase specific surface area. The FT-IR spectra, SEM EDX studies of rice hulls powder were examined for the pristine adsorbent and after the adsorption of heavy metal ions. The batch adsorption technique was adopted for this work and adsorption parameters were optimized. The maximum efficiency of adsorption is obtained at 6.0 pH, 1 h of contact duration, the rice husk dosage is 2.5 g/L, and temperature of 30 degrees C for 25 mg/L of Cr, Pb Zn metal ion solutions. The Cr, Pb Zn metal ions are removed up to 87.12 %, 88.63 % 99.28 %, respectively, using the rice husk powder. The adsorption process follows the Temkin D-R isotherm model. Elovich model was fitted against the kinetic data of metal ion adsorption. Based on the experimental observations, the rice husk powder can be considered as a low cost adsorbent for heavy metal ion removal from the industrial effluent.

Más información

Título según WOS: ID WOS:000704746200006 Not found in local WOS DB
Título de la Revista: CHEMOSPHERE
Volumen: 286
Editorial: PERGAMON-ELSEVIER SCIENCE LTD
Fecha de publicación: 2022
DOI:

10.1016/j.chemosphere.2021.131796

Notas: ISI