Removal of Cr(VI) from Aqueous Solutions Using Amino-Functionalized Carbon Nanospheres Adsorbents
Carbon nanospheres were prepared and functionalized with carboxyl acid groups (CNS-CA), then reacted with 3-aminopropyltriethoxysilane to introduce amino groups onto the surface (CNS-NH₂) by post-synthesis grafting. CNS-NH₂ was acidified in order to convert the amino groups (-NH₂) into ammonium mo...
| Veröffentlicht in: | Water environment research : a research publication of the Water Environment Federation. - 1998. - 90(2018), 11 vom: 01. Nov., Seite 1925-1937 |
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| Weitere Verfasser: | , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2018
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| Zugriff auf das übergeordnete Werk: | Water environment research : a research publication of the Water Environment Federation |
| Schlagworte: | Journal Article Water Pollutants, Chemical Chromium 0R0008Q3JB chromium hexavalent ion 18540-29-9 Carbon 7440-44-0 |
| Zusammenfassung: | Carbon nanospheres were prepared and functionalized with carboxyl acid groups (CNS-CA), then reacted with 3-aminopropyltriethoxysilane to introduce amino groups onto the surface (CNS-NH₂) by post-synthesis grafting. CNS-NH₂ was acidified in order to convert the amino groups (-NH₂) into ammonium moieties (<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="01925-ilm01.gif"/>). Various techniques such as N₂ physisorption, X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy, and transmission electron microscopy were used to characterize the nanospheres. The removal of chromium ions from aqueous solution using <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="01925-ilm12.gif"/> was investigated. Factors influencing the uptake of Cr(VI) ions such as solution pH, adsorbent dose, and initial Cr(VI) ion concentration were investigated. Equilibrium adsorption data fitted the Langmuir model very well. The adsorption maximum capacity of Cr(VI) was found to be 52.38 mg/g. The reusability of <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="01925-ilm23.gif"/> results indicated that it can be reused five times successfully without loss of adsorption capacity |
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| Beschreibung: | Date Completed 25.02.2019 Date Revised 25.02.2019 published: Print Citation Status MEDLINE |
| ISSN: | 1554-7531 |
| DOI: | 10.2175/106143017X15131012188132 |