Removal of methyl orange from aqueous solutions with poly(acrylic acid- co -acrylamide) superabsorbent resin
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Removal of methyl orange from aqueous solutions with poly(acrylic acid-co-acrylamide) superabsorbent resin Yaoji Tang • Xing Wang • Linhui Zhu
Received: 9 April 2012 / Accepted: 2 January 2013 / Published online: 8 January 2013 Ó Springer-Verlag Berlin Heidelberg 2013
Abstract Poly(acrylic acid-co-acrylamide) (P(AA-co-AM) superabsorbent resin was prepared by solution polymerization of acrylic acid (AA) and acrylamide (AM) using ammonium persulfate (APS) as an initiator and N,N0 -methylenebisacrylamide (MBA) as a cross linker. P(AA-co-AM) was used for the removal methyl orange (MO) from aqueous solutions. Factors influencing the adsorption capacity, such as adsorption time, initial concentration of MO, dosage of the superabsorbent resin, pH value and ionic strength, were investigated in detail. It was found that P(AA-coAM) was effective to remove MO from its aqueous solutions. The equilibrium adsorption capacity was 394.6 mg/g at room temperature as the initial concentration of MO was 3000 mg/L. The mechanism of the adsorption process was also speculated. Study on the equilibrium adsorption isotherms showed that the adsorption was in accordance with both Langmuir and Freundlich model. Further study of the adsorption kinetics showed that the adsorption process was consistent with the Pseudo second-order kinetic model. Keywords
Removal Methyl orange Superabsorbent resin Adsorption
Introduction Dyes are widely used in the world due to their bright colors and complete hues. Azo dyes, which share over 60 % of all commercial dyes because of their abilities of enduring long-term exposure to sunlight, water, and other undesirable conditions, are regarded as the most important class among the synthesized dyes. However, most of the azo dyes are produced in traditional ways, which brought about large Y. Tang (&) X. Wang L. Zhu College of Chemistry and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, People’s Republic of China e-mail: [email protected]
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Polym. Bull. (2013) 70:905–918
quantities of waste waters with complex composition and strong toxicity [1–4]. Various techniques have been used to deal with dye effluent such as biological method [5], chemical precipitation [6], hydrogen peroxide (H2O2) oxidation [7], and adsorption [8]. Among these methods chemical precipitation usually causes large numbers of dregs which could hardly be conducted. H2O2 oxidation provides an effective way to deal with the reductive materials, but was high in production cost. Biological method has a low production expense, but could not decolorize the dyes completely. In relative terms, adsorption is a simple, stable, and convenient method without secondary contamination. Therefore, adsorption has been taken into great account to remove dyes from wastewaters in recent years. Wang et al. [9] studied the adsorption behavior of methyl violet on poly(acrylic acid-co-acrylamide) (P(AA-co-AM))/attapulgite composite and found that the composite was quite effective to remove meth
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