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Polymers
Volume 16
Issue 7
10.3390/polym16071019
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Article

A Comparative Study of Removal of Acid Red 27 by Adsorption on Four Different Chitosan Morphologies

by
Hongli Wu
1,2,
Jiaying Zhou
1,2,
Sai Zhang
3,
Ping Niu
2,
Haoming Li
4,
Zhongmin Liu
2,
Ning Zhang
2,
Chunhui Li
1,2,*,
Liping Wang
1,* and
Yudong Wang
1,4,*
1
College of Textile and Light Industry, Inner Mongolia University of Technology, Hohhot 010081, China
2
College of Chemistry and Chemical Engineering, Dezhou University, Dezhou 253023, China
3
College of Textile and Clothing, Dezhou University, Dezhou 253023, China
4
College of Biological and Chemical Engineering, Guangxi University of Science & Technology, Liuzhou 545006, China
*
Authors to whom correspondence should be addressed.
Polymers 2024, 16(7), 1019; https://doi.org/10.3390/polym16071019
Submission received: 23 February 2024 / Revised: 29 March 2024 / Accepted: 2 April 2024 / Published: 8 April 2024
(This article belongs to the Special Issue Smart Textile and Polymer Materials II)
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Abstract

To investigate the relationship between structures and adsorption properties, four different morphologies of chitosan, with hydrogel (CSH), aerogel (CSA), powder (CSP), and electrospinning nanofiber (CSEN) characteristics, were employed as adsorbents for the removal of Acid Red 27. The structures and morphologies of the four chitosan adsorbents were characterized with SEM, XRD, ATR-FTIR, and BET methods. The adsorption behaviors and mechanisms of the four chitosan adsorbents were comparatively studied. All adsorption behaviors exhibited a good fit with the pseudo-second-order kinetic model (R2 > 0.99) and Langmuir isotherm model (R2 > 0.99). Comparing the adsorption rates and the maximum adsorption capacities, the order was CSH > CSA > CSP > CSEN. The maximum adsorption capacities of CSH, CSA, CSP, and CSEN were 2732.2 (4.523), 676.7 (1.119), 534.8 (0.885), and 215.5 (0.357) mg/g (mmol/g) at 20 °C, respectively. The crystallinities of CSH, CSA, CSP, and CSEN were calculated as 0.41%, 6.97%, 8.76%, and 39.77%, respectively. The crystallinity of the four chitosan adsorbents was the main factor impacting the adsorption rates and adsorption capacities, compared with the specific surface area. With the decrease in crystallinity, the adsorption rates and capacities of the four chitosan adsorbents increased gradually under the same experimental conditions. CSH with a low crystallinity and large specific surface area resulted in the highest adsorption rate and capacity.
Keywords: chitosan; acid dye; structure; adsorption capacity and rate; crystallinity chitosan; acid dye; structure; adsorption capacity and rate; crystallinity
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MDPI and ACS Style

Wu, H.; Zhou, J.; Zhang, S.; Niu, P.; Li, H.; Liu, Z.; Zhang, N.; Li, C.; Wang, L.; Wang, Y. A Comparative Study of Removal of Acid Red 27 by Adsorption on Four Different Chitosan Morphologies. Polymers 2024, 16, 1019. https://doi.org/10.3390/polym16071019

AMA Style

Wu H, Zhou J, Zhang S, Niu P, Li H, Liu Z, Zhang N, Li C, Wang L, Wang Y. A Comparative Study of Removal of Acid Red 27 by Adsorption on Four Different Chitosan Morphologies. Polymers. 2024; 16(7):1019. https://doi.org/10.3390/polym16071019

Chicago/Turabian Style

Wu, Hongli, Jiaying Zhou, Sai Zhang, Ping Niu, Haoming Li, Zhongmin Liu, Ning Zhang, Chunhui Li, Liping Wang, and Yudong Wang. 2024. "A Comparative Study of Removal of Acid Red 27 by Adsorption on Four Different Chitosan Morphologies" Polymers 16, no. 7: 1019. https://doi.org/10.3390/polym16071019

APA Style

Wu, H., Zhou, J., Zhang, S., Niu, P., Li, H., Liu, Z., Zhang, N., Li, C., Wang, L., & Wang, Y. (2024). A Comparative Study of Removal of Acid Red 27 by Adsorption on Four Different Chitosan Morphologies. Polymers, 16(7), 1019. https://doi.org/10.3390/polym16071019

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