Rapid and convenient synthesis of "green" ammonium-modified chitosan composite sponge with the existence of ascorbic acid for highly efficient removal of Congo red (CR)

Keyu Ren; Yanan Fan; Guozheng Xing; Mengge Zhai; Jie Sheng; Yishan Song

doi:10.1016/j.carbpol.2023.121444

Rapid and convenient synthesis of "green" ammonium-modified chitosan composite sponge with the existence of ascorbic acid for highly efficient removal of Congo red (CR)

Carbohydr Polym. 2024 Jan 15:324:121444. doi: 10.1016/j.carbpol.2023.121444. Epub 2023 Oct 6.

Authors

Keyu Ren¹, Yanan Fan¹, Guozheng Xing¹, Mengge Zhai¹, Jie Sheng², Yishan Song³

Affiliations

¹ College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, PR China.
² College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, PR China; Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation, Shanghai 201306, China; Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation (Shanghai), Ministry of Agriculture and Rural Affairs, Shanghai 201306, China. Electronic address: jsheng@shou.edu.cn.
³ College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, PR China; Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation, Shanghai 201306, China; Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation (Shanghai), Ministry of Agriculture and Rural Affairs, Shanghai 201306, China. Electronic address: yssong@shou.edu.cn.

PMID: 37985072
DOI: 10.1016/j.carbpol.2023.121444

Abstract

In this study, a new green composite sponge made of chitosan and modified with ammonium ascorbate (ACS-CIT) was synthesized in just 10 min. Compared with CS-CIT (sponge prepared from acetic acid), ACS-CIT exhibits significantly enhanced adsorption performance for CR, with the saturated adsorption capacities increased from 353.667 to 1261.639 mg·g^-1. The adsorption mechanism can be summarized as the generation of more hydrogen bonds, electrostatic attraction, and intra particle diffusion, revealing the addition of ascorbic acid introduced more hydroxyl groups, thereby enhancing the hydrogen bonding force, and the ammonium modification of chitosan improved the electrostatic attraction of the material, resulting in a significant increase in its adsorption capacity. Additionally, the prepared ACS-CIT showed excellent CR removal performance even in the presence of multiple interfering factors coexisting in the simulated wastewater, and the adsorption capacity remained stable after at least five cycles. Furthermore, the maximum bed capacity of ACS-CIT for CR is 1152.829 mg·g^-1 under the given conditions of a flow rate of 1 mL·min^-1, inlet concentration of 150 mg·L^-1, a bed height of 1 cm respectively, and the breakthrough curve followed the Thomas model. The results indicated the eco-friendly and recyclable ACS-CIT is a promising adsorbent for CR dye removal in water.

Keywords: Adsorption; Ammonium salt; Ascorbic acid; Chitosan composite sponge; Congo red.