Repository of Research and Investigative Information

Repository of Research and Investigative Information

Rafsanjan University of Medical Sciences

Synthesis, characterization and application of mesoporous silica in removal of cobalt ions from contaminated water

(2020) Synthesis, characterization and application of mesoporous silica in removal of cobalt ions from contaminated water. Groundwater for Sustainable Development. ISSN 2352801X (ISSN)

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Abstract

Mesoporous silica was synthesized by a chemical precipitation process and its efficiency was investigated for removal of cobalt ions (Co2+) from the contaminated water in a laboratory scale. The characteristic of the synthesized mesoporous were analyzed by SEM image. Optimal conditions were determined for important parameters such as solution pH, the absorbent dose, the initial Co2+ concentration and contact time by a one-variable method through the batch experiments. The SEM results confirmed the synthesized silica had high porosity with a honeycomb-like structure. The results showed that increase the adsorbent dose and contact time to the optimum increased the efficiency of Co2+ adsorption. However, with increasing the concentration of Co2+, the removal efficiency was decreased. The removal of Co2+ was 85% at the optimal contact time of 8 h. The maximum adsorption efficiency was 89% at pH = 7, initial Co2+ concentration of 5 ppm, and the adsorbent dose of 0.3 g/50 ml. The study of adsorption isotherm and kinetic models indicated that the adsorption process followed the Freundlich isotherm (R2 = 0.9359) and the second-order kinetic model (R2 = 0.9995). The synthesized mesoporous silica presented a chemical adsorption mechanism for Co2+ removal from aqueous media and it can be used in wastewater treatment containing bivalent heavy metals such as Co2+. © 2020 Elsevier B.V.

Item Type: Article
Keywords: Uranium | Second-Order Model | Sorption Isotherms
Subjects: WA Public Health > WA 108-245 Preventive Medicine
Divisions: Education Vice-Chancellor Department > Faculty of Health > Department of Environmental Health Engineering
Journal or Publication Title: Groundwater for Sustainable Development
Journal Index: Scopus
Volume: 11
Publisher: Elsevier B.V.
Identification Number: https://doi.org/10.1016/j.gsd.2020.100425
ISSN: 2352801X (ISSN)
Depositing User: خانم مهتاب اکبری
URI: http://eprints.rums.ac.ir/id/eprint/7216

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