title: Removal of Methyl Violet from aqueous solutions using poly (acrylic acid-co-acrylamide)/attapulgite composite.
abstract: The adsorption of Methyl Violet (MV) cationic dye from aqueous solution was carried out by using crosslinked poly (acrylic acid-coacrylamide)/attapulgite (Poly(AA-co-AM)/ATP) composite as adsorbent. The factors influencing adsorption capacity of the composite such as pH, concentration of the dye, temperature, contact time, adsorbent dosage, ionic strength and surfactant were systematically investigated. The equilibrium data fitted very well to the Langmuir isotherm and the maximum adsorption capacity reached 1194 mg/g at 30 degrees C. The thermodynamic parameters including deltaG0, deltaH0 and deltaS0 for the adsorption processes of MV on the composite were also calculated, and the negative deltaH0 and deltaG0 confirmed that the adsorption process was exothermic and spontaneous. The kinetic studies showed that the adsorption process was consistent with the pseudo second-order kinetic model and the desorption studies revealed that the regeneration of the composite adsorbent can be easily achieved.
authors.affiliation: Key Laboratory of Resources and Environment Chemistry of West China, Hexi University, Zhangye 734000, China. wys@hxu.edu.cn
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Zeng
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Ren
authors.forename: Hai
authors.initials: H
authors.lastname: Song
authors.forename: Aiqin
authors.initials: A
authors.lastname: Wang
mesh_terms: D000178:Acrylamides / Q000737:chemistry*; D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry*; D005840:Gentian Violet / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D017616:Magnesium Compounds / Q000737:chemistry*; D009994:Osmolar Concentration; D017655:Silicon Compounds / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D000178:Acrylamides; D004396:Coloring Agents; D017616:Magnesium Compounds; D017655:Silicon Compounds; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C431184:poly(acrylamide-co-acrylic acid); D005840:Gentian Violet; C026325:attapulgite