Removal of Cr(VI) from aqueous solution by surfactant-modified kaolinite |
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| Affiliation: | 1. School of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, PR China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing 100083, PR China;3. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Queensland 4001, Australia;1. Key Laboratory of Mineralogy and Metallogeny, Guangdong Provincial Key Laboratory of Mineral Physics and Material Research & Development, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Physical and Chemical Sciences, Queensland University of Technology, Australia |
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| Abstract: | Removal of Cr(VI) from aqueous solution by hexadecyltrimethylammonium chloride (HDTMA) modified kaolinite (HMK) was investigated, where the maximum adsorptive capacity reached 27.8 mg/g Cr(VI) using HMK compared with only 0.7 mg/g using unmodified natural kaolinite (NK). The adsorption of Cr(VI) on HMK can be well described by the Langmuir isotherm, and the kinetic adsorption of Cr(VI) on both HMK and NK fitted a pseudo-second-order model. FTIR analysis showed that surface modified HDTMA was responsible for the high adsorptive capacity of Cr(VI). HMK was used to remove Cr(VI) from an electroplating wastewater. |
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| Keywords: | Modified kaolinite HDTMA Cr(VI) Adsorption Wastewater |
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