Removal of Methyl Violet from aqueous solutions using poly(acrylic acid-co-acrylamide)/attapulgite composite
Yongsheng Wang , Li Zeng , Xuefeng Ren , Hai Song , Aiqin Wang
DOI:
Received March 16, 2009,Revised May 14, 2009, Accepted , Available online
Volume 22,2010,Pages 7-14
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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°C. The thermodynamic parameters including G0, H0 and S 0 for the adsorption processes of MV on the composite were also
calculated, and the negative H0 and G0 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.
