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Adsorption of a dye on clay and sand. Use of cyclodextrins as solubility-enhancement agents
Institution:1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China;2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;1. Departamento de Química, Universidad Nacional de Río Cuarto, Ruta Nacional 36 Km 601, X5804ZAB, Río Cuarto, Córdoba, Argentina;2. Departamento de Tecnología Química, Facultad de Ingeniería, Universidad Nacional de Río Cuarto, Ruta Nacional 36 Km 601, X5804ZAB, Río Cuarto, Córdoba, Argentina;3. Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida T. Bati 5678, 760 01 Zlin, Czech Republic;1. Laboratório de Imunopatologia, Núcleo de Pesquisas em Ciências Biológicas/NUPEB, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil;2. Laboratório de Morfopatologia, Núcleo de Pesquisas em Ciências Biológicas/NUPEB, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil;3. Departamento de Patologia Clínica, COLTEC, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil;4. Instituto Nacional de Ciência e Tecnologia em Doenças Tropicais, INCT-DT, Brazil;1. “Petru Poni” Institute of Macromolecular Chemistry, Iasi 700487, Romania;2. University “POLITEHNICA” of Bucharest, 011061 Bucharest, Romania;3. “Alexandru Ioan Cuza” University, Faculty of Biology, 700506 Iasi, Romania;1. College of Resource and Environmental Science, Jilin Agricultural University, Changchun, 130118, China;2. College of Life Sciences, The Key Laboratory of Straw Biology and Utilization, The Ministry of Education, Jilin Agricultural University, Changchun, Jilin, 130118, China;3. Inner Mongolia Key Laboratory of Photoelectric Functional Materials, Chifeng 024000, China;4. College of Chemistry and Life Sciences, Chifeng University, Chifeng 024000, China
Abstract:Laboratory-scale studies were aimed at elucidating the physico-chemical aspects on the removal process of crystal violet (CV) from waters and solid substrates. The laponite clay (RD) and sand were chosen for the double aim at investigating them as CV adsorbents for water treatment and as substrates which mime the soil components. Sand is very effective in removing CV from waters. The cyclodextrins (CDs) were exploited as solubility-enhancement agents to remove CV from the solid substrates. They are powerful solvent media because they extract the CV from sand forming water-soluble CV/CD inclusion complexes and do not show affinity for sand. Optimum performance was shown by the modified CDs (i.e. hydroxypropyl-β-cyclodextrin and methyl-β-cyclodextrin). A linear correlation between the logarithm of the equilibrium constant for the CV/CD inclusion complexes formation (Kcpx) and the maximum amount of CV extracted from sand in the columns experiments at a flow rate of 1.5 ml min?1 was drawn. This relationship predicts that CDs with Kcpx < 180 M?1 are not suitable for CV removal from sand. CDs failed to displace CV from RD because they generate the formation of RD clusters where CV remains entrapped.
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