Kinetics, isotherm and thermodynamic studies of S2− adsorption by (SBA-15)-Hg (II)
The nano-mesoporous material SBA (Santa Barbara Amorphous)-15 was synthesized using the hydrothermal method. Hg2+ was adsorbed by SBA-15 and then the S2− in the aqueous phase by (SBA-15)-Hg(II), with the hope that materials with better S2− adsorption properties can be obtained. The relevant material...
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| 语言: | English |
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IWA Publishing
2021-10-01
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| 丛编: | Water Practice and Technology |
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| 在线阅读: | http://wpt.iwaponline.com/content/16/4/1475 |
| _version_ | 1828957980686548992 |
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| author | Xiao-Dong Li Qing-Zhou Zhai |
| author_facet | Xiao-Dong Li Qing-Zhou Zhai |
| author_sort | Xiao-Dong Li |
| collection | DOAJ |
| description | The nano-mesoporous material SBA (Santa Barbara Amorphous)-15 was synthesized using the hydrothermal method. Hg2+ was adsorbed by SBA-15 and then the S2− in the aqueous phase by (SBA-15)-Hg(II), with the hope that materials with better S2− adsorption properties can be obtained. The relevant materials were characterized by X-ray diffraction, scanning electron microscopy, 77 K nitrogen adsorption-desorption, and related product characteristics were determined. In this work, the adsorption conditions of S2− onto (SBA-15)-Hg(II) were optimized. Adsorption efficiency reached about 92% and the adsorption capacity 55.02 mg/g. Studies of the system's adsorption kinetics showed that the pseudo-second-order equation applies. The thermodynamic results indicated that ΔG0 < 0, ΔH0 = −28.56 kJ/mol, ΔS0 = −81.136 J/(mol·K), and that adsorption is exothermic, enthalpy decreases and the reaction is spontaneous. This accords with the Freundlich isothermal adsorption equation. HIGHLIGHTS
Under the optimized adsorption conditions, the adsorption rate of S2− reached 92% and the adsorption capacity reached 55.02 mg/g.;
The adsorption process of S2− by the (SBA-15)-Hg(II) is in accordance with the quasi-second-order kinetic equation in kinetic aspect, and the adsorption isotherm is in accordance with the Freundlich model.; |
| first_indexed | 2024-12-14T08:39:06Z |
| format | Article |
| id | doaj.art-6994ba1b6a214a6fae0aaad30f5c5b47 |
| institution | Directory Open Access Journal |
| issn | 1751-231X |
| language | English |
| last_indexed | 2024-12-14T08:39:06Z |
| publishDate | 2021-10-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Practice and Technology |
| spelling | doaj.art-6994ba1b6a214a6fae0aaad30f5c5b472022-12-21T23:09:20ZengIWA PublishingWater Practice and Technology1751-231X2021-10-011641475148710.2166/wpt.2021.081081Kinetics, isotherm and thermodynamic studies of S2− adsorption by (SBA-15)-Hg (II)Xiao-Dong Li0Qing-Zhou Zhai1 Department of Basic Science, Jilin Jianzhu University, 5088 Xincheng Street, Changchun, Jilin Province 130118, China Research Center for Nanotechnology, Changchun University of Science and Technology, 7186 Weixing Road, Changchun 130022, China The nano-mesoporous material SBA (Santa Barbara Amorphous)-15 was synthesized using the hydrothermal method. Hg2+ was adsorbed by SBA-15 and then the S2− in the aqueous phase by (SBA-15)-Hg(II), with the hope that materials with better S2− adsorption properties can be obtained. The relevant materials were characterized by X-ray diffraction, scanning electron microscopy, 77 K nitrogen adsorption-desorption, and related product characteristics were determined. In this work, the adsorption conditions of S2− onto (SBA-15)-Hg(II) were optimized. Adsorption efficiency reached about 92% and the adsorption capacity 55.02 mg/g. Studies of the system's adsorption kinetics showed that the pseudo-second-order equation applies. The thermodynamic results indicated that ΔG0 < 0, ΔH0 = −28.56 kJ/mol, ΔS0 = −81.136 J/(mol·K), and that adsorption is exothermic, enthalpy decreases and the reaction is spontaneous. This accords with the Freundlich isothermal adsorption equation. HIGHLIGHTS Under the optimized adsorption conditions, the adsorption rate of S2− reached 92% and the adsorption capacity reached 55.02 mg/g.; The adsorption process of S2− by the (SBA-15)-Hg(II) is in accordance with the quasi-second-order kinetic equation in kinetic aspect, and the adsorption isotherm is in accordance with the Freundlich model.;http://wpt.iwaponline.com/content/16/4/1475adsorptionhg2+mesoporous materialsba-15s2− |
| spellingShingle | Xiao-Dong Li Qing-Zhou Zhai Kinetics, isotherm and thermodynamic studies of S2− adsorption by (SBA-15)-Hg (II) Water Practice and Technology adsorption hg2+ mesoporous material sba-15 s2− |
| title | Kinetics, isotherm and thermodynamic studies of S2− adsorption by (SBA-15)-Hg (II) |
| title_full | Kinetics, isotherm and thermodynamic studies of S2− adsorption by (SBA-15)-Hg (II) |
| title_fullStr | Kinetics, isotherm and thermodynamic studies of S2− adsorption by (SBA-15)-Hg (II) |
| title_full_unstemmed | Kinetics, isotherm and thermodynamic studies of S2− adsorption by (SBA-15)-Hg (II) |
| title_short | Kinetics, isotherm and thermodynamic studies of S2− adsorption by (SBA-15)-Hg (II) |
| title_sort | kinetics isotherm and thermodynamic studies of s2 adsorption by sba 15 hg ii |
| topic | adsorption hg2+ mesoporous material sba-15 s2− |
| url | http://wpt.iwaponline.com/content/16/4/1475 |
| work_keys_str_mv | AT xiaodongli kineticsisothermandthermodynamicstudiesofs2adsorptionbysba15hgii AT qingzhouzhai kineticsisothermandthermodynamicstudiesofs2adsorptionbysba15hgii |