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Self-cleaning and multi-active sites amphoteric composite sponges: Efficient removal, selective adsorption and photocatalyst substrates of dyes.

Self-cleaning and multi-active sites amphoteric composite sponges: Efficient removal, selective adsorption and photocatalyst substrates of dyes.

Authors :
Yang, Qiang
Guo, Jing
Yao, Qiang
Zhang, Sen
Feng, Shi
Guan, Fucheng
Li, Zheng
Zhang, Xin
Xu, Yi
He, Jiahao
Source :
Chemical Engineering Journal. Aug2024, Vol. 494, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

[Display omitted] • The amphoteric C/A composite sponges were prepared and characterized. • C/A composite sponges possess self-cleaning and multi-active sites. • Sponges' adsorption capacity for MB and AB dyes is 656.33 mg/g and 502.49 mg/g. • The selective adsorption ability of sponges could be modulated by various pH. • C/A composite sponges can be loaded with photocatalysts for dye degradation. To address the complex dyeing wastewater containing oil pollution and bacterial microorganisms in practical environments, in this work, amphoteric (CHI/ALG) C/A composite sponges with self-cleaning and multi-active sites were prepared by composite chitosan (CHI) and alginate (ALG) using urea/alkali composite solutions. The C/A composite sponges have good water wettability and demonstrated underwater anti-oil and anti-bacterial microbial adhesion. The adsorption process was spontaneous entropy-increasing and could be accurately described using the Pseudo-First-Order and Langmuir models. Notably, the adsorption capacity of C/A composite sponges for methylene blue and acid blue dye reached 656.33 mg/g and 502.49 mg/g, respectively. The amphoteric C/A composite sponges can selectively adsorb both anionic and cationic dyes. Additionally, epichlorohydrin (ECH) cross-linking and intermolecular self-assembly molding enabled the C/A composite sponges to form a three-dimensional network structure with nanofiber weaving and a specific surface area of 67.63 m2/g. Interestingly, this endowed the C/A composite sponges with the potential to serve as dyes photocatalyst substrates, and the photocatalytic degradation of dyes was successfully achieved by loading TiO 2 on the C/A composite sponges. More importantly, the C/A composite sponge remained self-cleaning after loading TiO 2. The amphoteric C/A composite sponges have great potential in complex dyeing wastewater treatment containing oil and bacterial microbes. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13858947
Volume :
494
Database :
Academic Search Index
Journal :
Chemical Engineering Journal
Publication Type :
Academic Journal
Accession number :
178462285
Full Text :
https://doi.org/10.1016/j.cej.2024.152865