Jump to main content
Jump to site search


Supercritical CO2 assisted synthesis of sulfur-modified zeolites as high-efficiency adsorbents for Hg2+ removal from water

Author affiliations

Abstract

A novel synthetic strategy has been successfully developed, which utilizes supercritical CO2 (SC-CO2) to fabricate sulfur-modified zeolites (zeolites@S) for Hg2+ removal from water. Owing to the low viscosity, high diffusivity and excellent dissolving capacity of SC-CO2 as well as the nontoxicity, noninflammability and being a low-cost solvent it exhibits the strong ability to expand the crystal structure of zeolite and the high-efficiency transfer of sulfur in zeolite matrices. Benefiting from this unique microstructure, zeolites@S adsorbents provide abundant pores and voids for absorbing Hg2+, and synchronously offer extra active sites for chemically trapping Hg2+ with sulfur. The pseudo-first-order kinetic/pseudo-second-order kinetic models and Langmuir/Freundlich isotherm models have been employed to study the adsorption behaviors and adsorption kinetic parameters. The results demonstrated that zeolites@S-15 (sulfur content = 15 wt%) exhibited the highest adsorption capacity and the best kinetic parameters for Hg2+ relative to other samples. This work will not only provide important reference for the rational design of zeolite based adsorbents for Hg2+ removal from aqueous solution, but also pave a new way to boost the commercialization of low-cost and high-efficiency functionalized adsorbents for purifying wastewater.

Graphical abstract: Supercritical CO2 assisted synthesis of sulfur-modified zeolites as high-efficiency adsorbents for Hg2+ removal from water

Back to tab navigation

Supplementary files

Publication details

The article was received on 09 Dec 2017, accepted on 18 Jan 2018 and first published on 19 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ04869F
Citation: New J. Chem., 2018, Advance Article
  •   Request permissions

    Supercritical CO2 assisted synthesis of sulfur-modified zeolites as high-efficiency adsorbents for Hg2+ removal from water

    R. Fang, C. Lu, W. Zhang, Z. Xiao, H. Chen, C. Liang, H. Huang, Y. Gan, J. Zhang and Y. Xia, New J. Chem., 2018, Advance Article , DOI: 10.1039/C7NJ04869F

Search articles by author

Spotlight

Advertisements