title: Defluoridation using biomimetically synthesized nano zirconium chitosan composite: kinetic and equilibrium studies.
abstract: The present study reports a novel approach for synthesis of Zr nanoparticles using aqueous extract of Aloe vera. Resulting nanoparticles were embedded into chitosan biopolymer and termed as CNZr composite. The composite was subjected to detailed adsorption studies for removal of fluoride from aqueous solution. The synthesized Zr nanoparticles showed UV-vis absorption peak at 420nm. TEM result showed the formation of polydispersed, nanoparticles ranging from 18nm to 42nm. SAED and XRD analysis suggested an fcc (face centered cubic) Zr crystallites. EDAX analysis suggested that Zr was an integral component of synthesized nanoparticles. FT-IR study indicated that functional group like NH, CO, CN and CC were involved in particle formation. The adsorption of fluoride on to CNZr composite worked well at pH 7.0, where ∼99% of fluoride was found to be adsorbed on adsorbent. Langmuir isotherm model best fitted the equilibrium data since it presented higher R(2) value than Freundlich model. In comparison to pseudo-first order kinetic model, the pseudo-second order model could explain adsorption kinetic behavior of F(-) onto CNZr composite satisfactorily with a good correlation coefficient. The present study revealed that CNZr composite may work as an effective tool for removal of fluoride from contaminated water.
authors.affiliation: Department of Environmental Biotechnology, Ashok & Rita Patel Institute of Integrated Study & Research in Biotechnology and Allied Sciences (ARIBAS), New Vallabh Vidyanagar, Anand, 388121 Gujarat, India. Electronic address: suranjit@gmail.com.
authors.forename: Kumar Suranjit
authors.initials: KS
authors.lastname: Prasad
authors.affiliation: Department of Environmental Biotechnology, Ashok & Rita Patel Institute of Integrated Study & Research in Biotechnology and Allied Sciences (ARIBAS), New Vallabh Vidyanagar, Anand, 388121 Gujarat, India. Electronic address: yesha_2879@yahoo.co.in.
authors.forename: Yesha
authors.initials: Y
authors.lastname: Amin
authors.affiliation: Nano and Computational Materials Lab, Catalysis Division, National Chemical Laboratory, Council of Scientific and Industrial Research, Pune 411008, India. Electronic address: k.selvaraj@ncl.res.in.
authors.forename: Kaliaperumal
authors.initials: K
authors.lastname: Selvaraj
mesh_terms: D000327:Adsorption; D032701:Biomimetics; D048271:Chitosan / Q000737:chemistry*; D007700:Kinetics; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
chemical_list: D048271:Chitosan; D015040:Zirconium
keywords: Aloe vera; Chitosan; FT-IR spectroscopy; Sorption; Zirconium nanoparticles