Adsorptive removal of basic dyes from aqueous solutions by surfactant modified bentonite clay (organoclay): Kinetic and competitive adsorption isotherm |
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| Institution: | 1. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;2. Institute for Future Environments, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4001, Australia;3. School of Earth, Environmental and Biological Sciences, Science and Engineering Faculty, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4001, Australia;1. Laboratoire Physico-Chimie des Matériaux – Catalyse et Environnement – LPCM-CE, Université des Sciences et de la Technologie d''Oran Mohamed Boudiaf (USTO-MB), BP 1505, El M''naouer, 31000 Oran, Algeria;2. Unité Matériaux et Transformations — UMET (UMR CNRS N° 8207), Bâtiment C6, Université Lille 1 — Sciences et Technologies, 59655 Villeneuve d''Ascq Cedex, France;1. Department of Industrial Biotechnology, Government College of Technology, Coimbatore 641013, Tamilnadu, India;2. Department of Chemical Engineering, Coimbatore Institute of Technology, Coimbatore 641014, Tamilnadu, India |
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| Abstract: | Cationic surfactant (Hexadecyltrimenthylammonium chloride) modified bentonite clay was prepared and systematically studied for its adsorption behavior as an efficient adsorbent for the removal of basic dyes such as methylene blue (MB), crystal violet (CV) and Rhodamine B (RB) from aqueous phase. Organo modified clay shows better capacity for the removal of three dyes. The adsorption process was found to be dependent on pH and initial dye concentration. The maximum dye sorption was found to be at a pH of 9.0 (99.99% for MB, 95.0% for CV and 83.0% for RB). The adsorption capacity for the dyes was found to be 399.74, 365.11 and 324.36 μmol/g for MB, CV and RB, respectively at 30 °C. The equilibrium uptake was attained within 240 min. The kinetic studies were revealed that sorption follows a pseudo-second-order kinetic model which indicates chemisorption between adsorbent and adsorbate molecules. Adsorption isotherm indicates non-energetically adsorption sites which fit with Freundlich isotherm model. The fitness of kinetics and isotherm models was evaluated by using HYBRID error analysis function. Competitive adsorptions of dyes were studied by using binary component systems. |
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| Keywords: | Bentonite Organoclay Adsorption isotherm Adsorption kinetics Competitive adsorption isotherm Basic dyes |
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