Preparation and Properties of an Aluminum Hydroxide-Modified Diatomite Sorbent for Removal of Fluorides from Waters
- Authors: Zelentsov V.I.1, Datsko T.Y.1, Politova E.D.2, Volodina G.F.1, Smolyanskii A.S.2
- 
							Affiliations: 
							- Institute of Applied Physics
- Branch of AO Karpov Scientific Research Institute of Physical and Chemistry
 
- Issue: Vol 55, No 4 (2019)
- Pages: 455-462
- Section: Article
- URL: https://journals.rcsi.science/1068-3755/article/view/231311
- DOI: https://doi.org/10.3103/S1068375519040161
- ID: 231311
Cite item
Abstract
A new sorbent (Al-D) for the removal of fluoride ions is prepared by modifying diatomite with aluminum ions. The sorbent is studied using X-ray diffraction, thermogravimetry, X-ray photoelectron spectroscopy, and adsorption structure analysis; its ability to remove fluoride ions from model aqueous solutions is measured under static conditions. The diatomite, which is modified by heterogeneous hydrolysis of an aluminum salt in the presence of diatomite suspension, has a higher specific surface area and a greater sorption pore volume and exhibits excellent characteristics in fluoride adsorption. Fluoride sorption isotherms measured under equilibrium conditions are modeled using the Langmuir, Freundlich, Langmuir−Freundlich, Brunauer−Emmett−Teller, and two-step Langmuir equations. The model parameters are calculated. The two-step Langmuir model gives the best fit to the experimental isotherms (R2 = 0.9836). Fluoride adsorption on the sorbent Al-D occurs via ion exchange: surface OH− groups are replaced with fluoride ions from solution to form aluminum fluoride complexes at the sorbent surface.
About the authors
V. I. Zelentsov
Institute of Applied Physics
							Author for correspondence.
							Email: vzelen@yandex.ru
				                					                																			                												                	Moldova, Republic of, 							Chisinau, MD 2028						
T. Ya. Datsko
Institute of Applied Physics
														Email: vzelen@yandex.ru
				                					                																			                												                	Moldova, Republic of, 							Chisinau, MD 2028						
E. D. Politova
Branch of AO Karpov Scientific Research Institute of Physical and Chemistry
														Email: vzelen@yandex.ru
				                					                																			                												                	Russian Federation, 							Moscow, 105064						
G. F. Volodina
Institute of Applied Physics
														Email: vzelen@yandex.ru
				                					                																			                												                	Moldova, Republic of, 							Chisinau, MD 2028						
A. S. Smolyanskii
Branch of AO Karpov Scientific Research Institute of Physical and Chemistry
														Email: vzelen@yandex.ru
				                					                																			                												                	Russian Federation, 							Moscow, 105064						
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