caa a22 4500 606170278 CHVBK 20210128100716.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s10098-015-0937-6 doi (NATIONALLICENCE)springer-10.1007/s10098-015-0937-6 Adsorption of fluoride from aqueous solution by a new low-cost adsorbent: thermally and chemically activated coconut fibre dust [Elektronische Daten] [Ria Bhaumik, Naba Mondal] Fluoride is a persistent and non-biodegradable pollutant that accumulates in soil, plants, wildlife and human beings. Therefore, knowledge of its removal, using the best technique with optimum efficiency, is needed. In the present study, the potential usage of coconut fibre (Cocos nucifera), which is an agricultural waste, in the adsorption of fluoride from aqueous solutions was evaluated with respect to various experimental parameters including pH, adsorbent dose, contact time, agitation speed, initial fluoride concentration and temperature. The objective is to expand upon research of new and existing fluoride removal technologies or promote a new, alternative process. In the present study, the maximum adsorption capacity was recorded as 12.66, 25.64 and 38.46mg/g for CFD-1, CFD-2 and CFD-3, respectively. From the kinetic study, it was found that fluoride adsorption by coconut fibre dust followed pseudo-second-order kinetics with an average constant of 0.002, 0.003 and 0.004g/mgmin for CFD-1, CFD-2 and CFD-3, respectively. Intraparticle diffusion model was studied to determine the rate-limiting step of the adsorption process. Thermodynamic parameters such as Gibb's free energy (∆G°), enthalpy (∆H°) and entropy (∆S°) changes were determined for the adsorption process. Negative ∆H° value signified that the adsorption process was exothermic in nature. Results from this study demonstrated potential utility of CFD adsorbent which could be developed into a suitable method for fluoride removal from aqueous solution. Springer-Verlag Berlin Heidelberg, 2015 Batch study nationallicence Fluoride nationallicence Isotherm models nationallicence Kinetics nationallicence Thermodynamic study nationallicence Bhaumik Ria Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, 713104, Burdwan, India aut Mondal Naba Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, 713104, Burdwan, India aut Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/8(2015-12-01), 2157-2172 1618-954X 17:8<2157 2015 17 10098 https://doi.org/10.1007/s10098-015-0937-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10098-015-0937-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bhaumik Ria Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, 713104, Burdwan, India aut NATIONALLICENCE 700 1- Mondal Naba Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, 713104, Burdwan, India aut NATIONALLICENCE 773 0- Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/8(2015-12-01), 2157-2172 1618-954X 17:8<2157 2015 17 10098