Journal
DESALINATION AND WATER TREATMENT
Volume 212, Issue -, Pages 220-233Publisher
DESALINATION PUBL
DOI: 10.5004/dwt.2021.26683
Keywords
Adsorption removal; Ethyl xanthate; Activated carbon; Adsorption mechanism
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Xanthate removal from aqueous solutions by activated carbon adsorption was studied in this research. The results indicated that activated carbon is a high-potential adsorbent for xanthate removal, with the adsorption primarily occurring on non-polar carbon surface patches driven by hydrophobic interactions. Adsorption process was found to be spontaneous and endothermic, with pore diffusion identified as the rate-limiting step.
Xanthate is a widely common pollutant in wastewaters of mineral industries. The removal of ethyl xanthate (EX-), the most widely used xanthates in mineral industries, from aqueous solutions was studied by activated carbon adsorption as the clean and cost-effective industrial wastewater treatment technology. The characterization of activated carbon (AC) was performed by a point of zero charge determination, scanning electron microscopy, wavelength dispersive X-ray, surface area, and a pore size analyzer. The evaluation of initial solution concentration, pH, temperature, particle size, and surface chemistry of AC on the adsorption process showed that it is a high-potential adsorbent for xanthate removal. The study of EX- adsorption onto acid/base treated ACs revealed that the adsorption of EX- primarily occurs on non-polar carbon surface patches where it is driven by hydrophobic interactions. The equilibrium and kinetic data were best modeled by the Koble-Corrigan isotherm and fractional power kinetic model, respectively. The rate-limiting step during the EX- adsorption onto AC was determined to be pore diffusion. The thermodynamic studies revealed that the adsorption process is spontaneous and endothermic.
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