Mortazavian, Soroosh Saber, Ali Hong, Jaeyoung Bae, Jee Hwan Chun, Dongwon Wong, Nicolas Gerrity, Daniel Batista, Jacimaria Kim, Kwang J. Moon, Jaeyun 2024-01-19T21:03:38Z 2024-01-19T21:03:38Z 2021-09-02 2019-01 1226-086X https://pubs.kist.re.kr/handle/201004/120548 Activated carbon (AC) is a widely used adsorbent with a limited selectivity for chromium species. In this study, polysulfide rubber (PSR) polymer was synthesized, characterized by FTIR, and coated on F400 granular AC to obtain AC-PSR. The material properties of this composite adsorbent were investigated using SEM, TEM, EDS, TGA, BET isotherm, and XPS. The effectiveness of AC-PSR for aqueous Cr(VI) removal was investigated, and compared against virgin AC. The results showed that despite a 23% decrease in the surface area of AC after PSR coating, AC-PSR had a higher capacity for Cr(VI) adsorption. Adsorption followed a pseudo-second-order biphasic diffusion model for both AC and AC-PSR. The reaction rate constants showed that despite faster initial kinetics between AC and Cr(VI) during the film diffusion step, AC-PSR exhibited faster kinetics during the intraparticle diffusion step. The Langmuir isotherm model was found to be the best model to describe the experimental data, which showed a higher adsorption capacity for AC-PSR (Q(M,AC) = 3.472 mg/g vs. Q(M,AC-PSR) = 8.929 mg/g) and a stronger binding between Cr(VI) and AC-PSR (b(A,AC) = 0.391 L/mg vs. b(A,AC-PSR) = 0.696 L/mg). Regenerated AC-PSR showed an 8% increase in Cr(VI) removal efficiency after the first cycle, and then maintained a similar to 98% Cr(VI) removal for three additional successive cycles. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. English 한국공업화학회 Synthesis, characterization, and kinetic study of activated carbon modified by polysulfide rubber coating for aqueous hexavalent chromium removal Article 10.1016/j.jiec.2018.09.028 1 Journal of Industrial and Engineering Chemistry, v.69, pp.196 - 210 Journal of Industrial and Engineering Chemistry 69 196 210 N scie scopus kci 000452934600021 2-s2.0-85054136667 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article CR(VI) REMOVAL INTRAPARTICLE-DIFFUSION WASTE-WATER SULFUR 2P ADSORPTION EQUILIBRIUM REMEDIATION REDUCTION CHROMATE SORPTION Cr(VI) treatment Thiol-modified activated carbon Polysulfide rubber polymer Groundwater remediation Biphasic intraparticle diffusion model Material characterization