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Zhakisheva B, José Gutiérrez-Sevillano J, Calero S. AMMONIA AND WATER IN ZEOLITES: EFFECT OF ALUMINUM DISTRIBUTION ON THE HEAT OF ADSORPTION. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Preparation and Characterization of the Sulfur-Impregnated Natural Zeolite Clinoptilolite for Hg(II) Removal from Aqueous Solutions. Processes (Basel) 2021. [DOI: 10.3390/pr9020217] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Sulfur-impregnated zeolite has been obtained from the natural zeolite clinoptilolite by chemical modification with Na2S at 150 °C. The purpose of zeolite impregnation was to enhance the sorption of Hg(II) from aqueous solutions. Chemical analysis, acid and basic properties determined by Bohem’s method, chemical behavior at different pHo values, zeta potential, cation-exchange capacity (CEC), specific surface area, X-ray powder diffraction (XRPD), scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), as well as thermogravimetry with derivative thermogravimetry (TG-DTG) were used for detailed comparative mineralogical and physico-chemical characterization of natural and sulfur-impregnated zeolites. Results revealed that the surface of the natural zeolite was successfully impregnated with sulfur species in the form of FeS and CaS. Chemical modification caused an increase in basicity and the net negative surface charge due to an increase in oxygen-containing functional groups as well as a decrease in specific surface area and crystallinity due to the formation of sulfur-containing clusters at the zeolite surface. The sorption of Hg(II) species onto the sulfur-impregnated zeolite was affected by the pH, solid/liquid ratio, initial Hg(II) concentration, and contact time. The optimal sorption conditions were determined as pH 2, a solid/liquid ratio of 10 g/L, and a contact time of 800 min. The maximum obtained sorption capacity of the sulfur-impregnated zeolite toward Hg(II) was 1.02 mmol/g. The sorption mechanism of Hg(II) onto the sulfur-impregnated zeolite involves electrostatic attraction, ion exchange, and surface complexation, accompanied by co-precipitation of Hg(II) in the form of HgS. It was found that sulfur-impregnation enhanced the sorption of Hg(II) by 3.6 times compared to the natural zeolite. The leaching test indicated the retention of Hg(II) in the zeolite structure over a wide pH range, making this sulfur-impregnated sorbent a promising material for the remediation of a mercury-polluted environment.
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Nan Y, Liu J, Tang S, Lin R, Tavlarides LL. Silver-Exchanged Mordenite for Capture of Water Vapor in Off-Gas Streams: A Study of Adsorption Kinetics. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b04420] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yue Nan
- Department of Biomedical
and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
| | - Jiuxu Liu
- Department of Biomedical
and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
| | - Siqi Tang
- Department of Biomedical
and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
| | - Ronghong Lin
- Department of Biomedical
and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
| | - Lawrence L. Tavlarides
- Department of Biomedical
and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
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Nan Y, Lin R, Liu J, Crowl TB, Ladshaw A, Yiacoumi S, Tsouris C, Tavlarides LL. Adsorption Equilibrium and Modeling of Water Vapor on Reduced and Unreduced Silver-Exchanged Mordenite. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b01180] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yue Nan
- Department
of Biomedical and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
| | - Ronghong Lin
- Department
of Biomedical and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
| | - Jiuxu Liu
- Department
of Biomedical and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
| | - Tyler B. Crowl
- Department
of Biomedical and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
| | - Austin Ladshaw
- School
of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0355, United States
| | - Sotira Yiacoumi
- School
of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0355, United States
| | - Costas Tsouris
- School
of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0355, United States
- Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831-6181, United States
| | - Lawrence L. Tavlarides
- Department
of Biomedical and Chemical Engineering, Syracuse University, 329 Link Hall, Syracuse, New York 13244, United States
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