Acid green-25 removal from wastewater by anion exchange membrane: Adsorption kinetic and thermodynamic studies

Muhammad Imran Khan , Tariq Mahmood Ansari , Shagufta Zafar , Abdul Rehman Buzdar6 , Muhammad Ali Khan , Fatima Mumtaz , Prasert Prapamonthon , Mehwish Akhtar

Abstract

In this work, batch adsorption of anionic dye acid green-25 (AG-25) from aqueous solution has been carried out at room temperature using anion exchange membrane (DF-120B) as a noval adsorbent. The effect of various experimental parameters such as contact time, membrane dosage, ionic strength and temperature on the adsorption of dye were investigated. Kinetic models namely pseudo-first-order, pseudo-second-order, Elovich, liquid film diffusion, Bangham and modified freundlich models were employed to evaluate the experimental data. Parameters like adsorption capacities, rate constant and related correlation coefficients for every model are calculated and discussed. It showed that adsorption of AG-25 onto DF-120B followed pseudo-first-order rate expression. Thermodynamic study indicates that adsorption of AG-25 onto DF-120B is an exothermic and spontaneous process.

Key Words

adsorption; Acid Green-25; anion exchange membrane; kinetics; Freundlich kinetic model; thermodynamic; exothermic process

Address

Muhammad Imran Khan — 1.) CAS Key Laboratory of Soft Matter Chemistry, Lab of Functional Membranes, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui 230026, P.R. China 2.)Fujian Institute of Research on Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian, P.R. China
Tariq Mahmood Ansari and Muhammad Ali Khan — Institute of Chemical Sciences, Bahauddin Zakariya University, Multan 60000, Pakistan
Shagufta Zafar and Mehwish Akhtar — Department of Chemistry, The Govt Sadiq College Women University, Bahawalpur, Pakistan Abdul Rehman Buzdar:Department of CSE, HITEC University, Taxila Cantt 47050, Pakistan
Fatima Mumtaz — CAS Key Laboratory of Soft Matter Chemistry, Lab of Functional Membranes, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui 230026, P.R. China
Prasert Prapamonthon — Department of Thermal Science & Energy Engineering, University of Science and Technology of China,Hefei, Anhui 230026, P.R. China

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