Novel mesoporous chitosan-zirconia-ferrosoferric oxide as magnetic composite for defluoridation of water. Issue 5 (October 2020)

• Record Type: Journal Article
• Authors: Korde, Sanjiwani; Tandekar, Swati; Jugade, R.M.
• Is Part Of: Journal of environmental chemical engineering. Volume 8:Issue 5(2020)
• Publication Date: 2020-10
• Subjects: Mesoporous -- Chitosan -- Zirconia -- Magnetic composite -- Defluoridation; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2020.104360
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Mesoporous chitosan-ZrO2 -Fe3 O4 composite as excellent adsorbent for fluoride. Magnetic nature makes it simple to separate from water body after use. Large surface area and mesoporous nature leads to high adsorption capacity. Adsorption capacity of 17.81 mg -1 in accordance with Langmuir isotherm model. Material could be regenerated and reused in multiple cycles. Abstract: Mesoporous chitosan-zirconia-ferrosoferric oxide (Meso-ChZrFe) composite was synthesized using chemical co-precipitation method. The composite showed could be easily separated from the solution by external magnet. The material was characterized using Fourier Transform Infrared spectroscopy, Scanning Electron Microscopy, Energy Dispersive X-ray analysis, BET surface area analysis, Thermogravimetry, X-ray diffraction and pH point of zero charge studies. The adsorption studies were carried out by optimizing various parameters as pH, adsorbent dose, adsorption time, initial fluoride concentration and effect of diverse ions. The material showed maximum defluoridation capacity of 17.81 mg g -1 at pH 3.0 within 60 min contact time. The adsorption process followed pseudo second order kinetics in accordance with Langmuir adsorption isotherm. Thermodynamics studies reveal that the process was spontaneous, exothermic and lead to decrease in entropy of the adsorbate. The material was tested for regeneration and could be reused for ten adsorption-desorption cycles with less than 12% reduction in adsorption efficiency.