Adsorption comparison at the α-alumina/water interface: 3,4-Dihydroxybenzoic acid vs. catechol

Autor:	Jayanta M. Borah, Sekh Mahiuddin, Jyotirmoy Sarma
Rok vydání:	2011
Předmět:	Catechol chemistry.chemical_compound Colloid and Surface Chemistry Adsorption Denticity chemistry Kinetic equations Kinetics Inorganic chemistry Electrolyte Kinetic energy Spectral line
Zdroj:	Colloids and Surfaces A: Physicochemical and Engineering Aspects. 387:50-56
ISSN:	0927-7757
DOI:	10.1016/j.colsurfa.2011.07.024
Popis:	Adsorption kinetics and isotherms and the surface complexation of 3,4-dihydroxybenzoic acid (3,4-DHBA) and catechol at the α-alumina/electrolyte interface were investigated. The state of equilibrium for adsorption of 3,4-DHBA onto α-alumina surface at pH 5 was attained at 120 min, whereas it was 90 min for catechol, but at pH 10 the state of equilibrium for the both the systems was same (∼60 min). The pseudo-second-order kinetic equation of nonlinear form (Eq. (3) ) fits the experimental kinetic data significantly better than the linear form (Eq. (2) ) in the entire time duration. The adsorption density of 3,4-DHBA onto the α-alumina surfaces at pH 10 and at similar experimental conditions is equivalent to catechol. DRIFT spectra indicate that 3,4-DHBA forms both outer- and inner-sphere complexes and catechol forms bidentate mononuclear complex with the α-alumina surface.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4d65aecfd8375ef8c6265675b9eca2a6 https://doi.org/10.1016/j.colsurfa.2011.07.024 Zobrazit plný text záznamu Full Text from ScienceDirect