Adsorptive Removal of a Reactive Azo Dye Using Polyaniline-Intercalated Bentonite
Jingxi Tie1,3, Xiaohong Fang1, Xiaolei Wang1, Yao Zhang1, Tian Gu1, Shujun Deng2, Guoting Li1, Dengyong Tang3
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1School of Environmental and Municipal Engineering, North China University of Water Resources and Electrical Power,
Zhengzhou, 450011, PR China
2School of Resources and the Environment, North China University of Water Resources and Electrical Power,
Zhengzhou, 450011, PR China
3School of Environmental Science and Engineering, Nanjing University of Information Science and Technology,
Nanjing, 210044, PR China
Submission date: 2016-05-20
Final revision date: 2016-10-28
Acceptance date: 2016-12-05
Online publication date: 2017-05-15
Publication date: 2017-05-26
Pol. J. Environ. Stud. 2017;26(3):1259–1268
For this study we conducted a series of adsorption experiments to study the adsorption performance of reactive red 2 (RR-2), a typical anionic dye, on polyaniline-intercalated bentonite (Pani-Bent). The adsorbent was characterized by XRD, FTIR, SEM, TEM, and BET. We investigated the influences of several parameters, including pH, reaction time, temperature, inorganic salts, and initial concentrations. The results indicate that the adsorption of RR-2 is better in an acidic solution. Both NaCl and Na2SO4 can improve RR-2 uptake. The adsorption process follows the pseudo second-order kinetic model. The non-linear regression method was adopted to analyze the obtained equilibrium data in terms of the Langmuir, Freundlich, Temkin, Dubinin-Radushkevich (D-R), and Flory-Huggins models. The Langmuir isotherm fits the equilibrium data best among the five models, and the adsorption capacity increases from 202.0 to 257.7 mg/g as the temperature increases from 5ºC to 33ºC Pani-Bent can be an efficient adsorbent for adsorption removal of RR-2 from its aqueous solutions.