Adsorption of phosphate by layered double hydroxides in aqueous solutions

Autor:	B.S. Patra, N. Baliarsingh, Kulamani Parida, Jayeeta Das
Rok vydání:	2006
Předmět:	Langmuir Aqueous solution Ion exchange Inorganic chemistry Layered double hydroxides Geology engineering.material Phosphate law.invention chemistry.chemical_compound Adsorption chemistry Geochemistry and Petrology law engineering Calcination Freundlich equation
Zdroj:	Applied Clay Science. 32:252-260
ISSN:	0169-1317
DOI:	10.1016/j.clay.2006.02.005
Popis:	Adsorption of phosphate by various calcined layered double hydroxides (LDHs) such as Mg–Al, Zn–Al, Ni–Al, Co–Al, Mg–Fe, Zn–Fe, Ni–Fe and Co–Fe was investigated. LDHs were found to have high anion exchange capacity that enhances their capability to remove anionic contaminants from aqueous system. The nature and content of di- and trivalent cations in LDH have strong influence on the adsorption process. Calcined Mg–Al LDH (CLDH) with Mg–Al molar ratio of 2.0 showed higher adsorption capacity compared to other calcined LDHs as it possessed higher Al3+ content. Results indicate that the adsorption isotherm could be fitted to a linearised form of Langmuir and Freundlich equations. The adsorption phenomenon has been well supported by XRD study. The adsorption process was spontaneous and exothermic in nature and followed first order kinetics. Competitive anions were found to have detrimental effect on the percentage of adsorption.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::aa01db630442c19767bf7c38846380a6 https://doi.org/10.1016/j.clay.2006.02.005 Zobrazit plný text záznamu Full Text from ScienceDirect