Fabrication of attapulgite-based dual responsive composite hydrogel and its efficient adsorption for methyl violet.
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| Title: | Fabrication of attapulgite-based dual responsive composite hydrogel and its efficient adsorption for methyl violet. |
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| Authors: | Liu, Yi-xin1,2 (AUTHOR), Zhong, Hui1,2 (AUTHOR) huizhong@hytc.edu.cn, Li, Xiao-rong2 (AUTHOR), Bao, Zhuan-li2 (AUTHOR), Cheng, Zhi-peng2 (AUTHOR), Zhang, Yu-jie2 (AUTHOR), Li, Chun-xiang1 (AUTHOR) lichunxiang76@126.com |
| Source: | Environmental Technology. Apr2022, Vol. 43 Issue 10, p1480-1492. 13p. |
| Subject Terms: | *Adsorption (Chemistry), Hydrogels, Gentian violet, Langmuir isotherms, Fourier transform infrared spectroscopy, Adsorption capacity |
| Abstract: | In this work, attapulgite (ATP)-based dual sensitive poly (N-isopropylacrylamide-co-acrylic acid) composite hydrogel, P(NIPAM-co-AA)/ATP, was prepared by free radical polymerization. The prepared composite hydrogel was characterized via methods of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), zeta potential analysis and Brunauer, Emmett, and Teller (BET) etc. The composite hydrogel showed pH and temperature sensitive behaviour, with lower critical solution temperature (LCST) of 35°C and highest swelling occurred at pH 8.0. The adsorption of methyl violet (MV) can be controlled by the hydrogel responsiveness, and 95.78% of MV can be removed at pH 8.0 and 35°C. The addition of a small amount of ATP (3 Wt%) can improve the swelling ratio and adsorption capacity. Kinetic analysis demonstrated that the experimental data were best fitted to the pseudo-second order model. Isotherm analysis showed that the equilibrium data followed Langmuir model with the adsorption capacity of 168.35 mg g−1. In addition, the composite hydrogel has high adsorption selectivity for cationic dyes, and MV-loaded hydrogel is easy to regenerate, which can be used for successive adsorption cycles. These results demonstrate that the composite hydrogel has potential application in dye wastewater treatment. [ABSTRACT FROM AUTHOR] |
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| Database: | GreenFILE |
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| Abstract: | In this work, attapulgite (ATP)-based dual sensitive poly (N-isopropylacrylamide-co-acrylic acid) composite hydrogel, P(NIPAM-co-AA)/ATP, was prepared by free radical polymerization. The prepared composite hydrogel was characterized via methods of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), zeta potential analysis and Brunauer, Emmett, and Teller (BET) etc. The composite hydrogel showed pH and temperature sensitive behaviour, with lower critical solution temperature (LCST) of 35°C and highest swelling occurred at pH 8.0. The adsorption of methyl violet (MV) can be controlled by the hydrogel responsiveness, and 95.78% of MV can be removed at pH 8.0 and 35°C. The addition of a small amount of ATP (3 Wt%) can improve the swelling ratio and adsorption capacity. Kinetic analysis demonstrated that the experimental data were best fitted to the pseudo-second order model. Isotherm analysis showed that the equilibrium data followed Langmuir model with the adsorption capacity of 168.35 mg g−1. In addition, the composite hydrogel has high adsorption selectivity for cationic dyes, and MV-loaded hydrogel is easy to regenerate, which can be used for successive adsorption cycles. These results demonstrate that the composite hydrogel has potential application in dye wastewater treatment. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09593330 |
| DOI: | 10.1080/09593330.2020.1838623 |
