title: Adsorption of methyl violet onto mesoporous MCM-48 from aqueous solution.
abstract: In this study, hexadecyltrimethyl ammonium bromide and triblock poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) were used as co-templates and tetraethoxysilane was used as silica source to synthesize mesoporous MCM-48, which was employed to adsorb methyl violet dye from water. The prepared MCM-48, after calcination at 550 degrees C, was found to have a high surface area of 1072 m2/g and a pore volume of 1.08 cm3/g. The MCM-48 adsorption of methyl violet in aqueous solution was studied using UV-visible spectrophotometry. Experimental conditions, including initial pH of sample solution, initial concentration, MCM-48 amount, adsorption time and temperature, were also investigated. Results showed that the adsorption behavior could well be depicted by Langmuir equations and pseudo-second-order kinetic model. The maximum adsorption capacity of 193.82 mg/g was obtained at 20 degrees C. The values for thermodynamic parameters deltaG0, deltaS0 and deltaH0 were all negative, showing that the MCM-48 adsorption of methyl violet was spontaneous and exothermic.
authors.forename: Xingxing
authors.initials: X
authors.lastname: Gu
authors.forename: Hong
authors.initials: H
authors.lastname: Xu
authors.forename: Lingling
authors.initials: L
authors.lastname: Luo
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.forename: Hongjun
authors.initials: H
authors.lastname: Lin
authors.forename: Jianrong
authors.initials: J
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D003198:Computer Simulation; D005840:Gentian Violet / Q000737:chemistry / Q000302:isolation & purification*; D008422:Materials Testing; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D016062:Porosity; D012996:Solutions; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D012996:Solutions; D014874:Water Pollutants, Chemical; D017641:Zeolites; D005840:Gentian Violet