Magnesium incorporated bentonite clay for defluoridation of drinking water

0356137 - ÚACH 2011 RIV NL eng J - Journal Article
Thakre, D. - Rayalu, S. - Kawade, R. - Meshram, S. - Šubrt, Jan - Labhsetwar, N.
Magnesium incorporated bentonite clay for defluoridation of drinking water.
Journal of Hazardous Materials. Roč. 180, 1-3 (2010), s. 122-130. ISSN 0304-3894. E-ISSN 1873-3336
Institutional research plan: CEZ:AV0Z40320502
Keywords : adsorption * bentonite * fluoride removal
Subject RIV: CA - Inorganic Chemistry
Impact factor: 3.723, year: 2010

Low cost bentonite clay was chemically modified using magnesium chloride in order to enhance its fluoride removal capacity. The magnesium incorporated bentonite (MB) was characterized by using XRD and SEM techniques. Batch adsorption experiments were conducted to study and optimize various operational parameters such as adsorbent dose, contact time, pH, effect of co-ions and initial fluoride concentration. It was observed that the MB works effectively over wide range of pH and showed a maximum fluoride removal capacity of 2.26 mg g(-1) at an initial fluoride concentration of 5 mg L-1, which is much better than the unmodified bentonite. The experimental data fitted well into Langmuir adsorption isotherm and follows pseudo-first-order kinetics. Thermodynamic study suggests that fluoride adsorption on MB is reasonably spontaneous and an endothermic process. MB showed significantly high fluoride removal in synthetic water as compared to field water.
Permanent Link: http://hdl.handle.net/11104/0194740