Synthesis, Characterization, and Kinetic Study of Activated Carbon Modified by Polysulfide Rubber Coating for Aqueous Hexavalent Chromium Removal

Authors

Soroosh Mortazavian, University of Nevada, Las VegasFollow
Ali Saber, University of Nevada, Las VegasFollow
Jaeyoung Hong, Korea Institute of Science and Technology (KIST)Follow
Jee-Hwan Bae, Korea Institute of Science and Technology (KIST)Follow
Dongwon Chun, Korea Institute of Science and Technology (KIST)Follow
Nicolas Wong, University of Nevada, Las VegasFollow
Daniel Gerrity, University of Nevada, Las VegasFollow
Jacimaria Batista, University of Nevada, Las VegasFollow
Kwang J. Kim, University of Nevada, Las VegasFollow
Jaeyun Moon, University of Nevada, Las VegasFollow

Document Type

Article

Publication Date

9-24-2018

Publication Title

Journal of Industrial and Engineering Chemistry

First page number:

1

Last page number:

15

Abstract

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 (QM,AC = 3.472 mg/g vs. QM,AC-PSR = 8.929 mg/g) and a stronger binding between Cr(VI) and AC-PSR (bA,AC = 0.391 L/mg vs. bA,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 ∼98% Cr(VI) removal for three additional successive cycles.

Keywords

Cr(VI) treatment; Thiol-modified activated carbon; Polysulfide rubber polymer; Groundwater remediation; Biphasic intraparticle diffusion model; Material characterization

Disciplines

Chemical Engineering

Language

English

Repository Citation

Mortazavian, S., Saber, A., Hong, J., Bae, J., Chun, D., Wong, N., Gerrity, D., Batista, J., Kim, K. J., Moon, J. (2018). Synthesis, Characterization, and Kinetic Study of Activated Carbon Modified by Polysulfide Rubber Coating for Aqueous Hexavalent Chromium Removal. Journal of Industrial and Engineering Chemistry 1-15.
http://dx.doi.org/10.1016/j.jiec.2018.09.028