TY - JOUR
T1 - Functionally-Designed Chitosan-based hydrogel beads for adsorption of sulfamethoxazole with light regeneration
AU - Zhou, Aijiao
AU - Yang, Kai
AU - Wu, Xumeng
AU - Liu, Guoqing
AU - Zhang, Tian C.
AU - Wang, Qin
AU - Luo, Fan
N1 - Funding Information:
We would like to thank the National Natural Science Foundation of China (No. 51778256 ) and the Fundamental Research Funds for the Central Universities , HUST (Grant No. 2017KFYXJJ216 ). We also thank the Analytical and Testing Center of Huazhong University of Science and Technology for related measurements.
Publisher Copyright:
© 2022
PY - 2022/7/15
Y1 - 2022/7/15
N2 - Adsorption method has been widely used in the removal of emerging contaminants. However, many adsorbents are puzzled by key obstacles for effective and simple regeneration. In this work, the functionally-designed graphitic carbon nitride (g-C3N4) embedded chitosan-polyvinyl alcohol composite (g-C3N4/CS/PVA) hydrogel beads were synthesized for the adsorptive removal of sulfamethoxazole (SMX) from water, and they could be regenerated by light. The adsorption kinetics, isotherm, thermodynamics, and impacting factors were systematically investigated. And the adsorption capacity of the hydrogel for SMX was relatively stable at pH of 4–8, with the maximum adsorption capacities being 5.8 mg g−1 at pH 5. The main adsorption force may be inferred to the electrostatic interactions between SMX and hydrogel beads, and hydrogen bonds between the amino or hydroxyl groups of the hydrogel and the amino of the SMX. The dominance of electrostatic interactions resulted in SMX adsorption being highly dependent on ionic strength. Being irradiated with an ultraviolet lamp for 5 recycles, the hydrogel beads still kept good adsorption capacity. The regeneration behavior was attributed to the photocatalytic degradation of SMX by g-C3N4. Namely, photocatalytic oxidation reactivated the adsorption sites and increased the release of adsorbed pollutants with improved desorption performance.
AB - Adsorption method has been widely used in the removal of emerging contaminants. However, many adsorbents are puzzled by key obstacles for effective and simple regeneration. In this work, the functionally-designed graphitic carbon nitride (g-C3N4) embedded chitosan-polyvinyl alcohol composite (g-C3N4/CS/PVA) hydrogel beads were synthesized for the adsorptive removal of sulfamethoxazole (SMX) from water, and they could be regenerated by light. The adsorption kinetics, isotherm, thermodynamics, and impacting factors were systematically investigated. And the adsorption capacity of the hydrogel for SMX was relatively stable at pH of 4–8, with the maximum adsorption capacities being 5.8 mg g−1 at pH 5. The main adsorption force may be inferred to the electrostatic interactions between SMX and hydrogel beads, and hydrogen bonds between the amino or hydroxyl groups of the hydrogel and the amino of the SMX. The dominance of electrostatic interactions resulted in SMX adsorption being highly dependent on ionic strength. Being irradiated with an ultraviolet lamp for 5 recycles, the hydrogel beads still kept good adsorption capacity. The regeneration behavior was attributed to the photocatalytic degradation of SMX by g-C3N4. Namely, photocatalytic oxidation reactivated the adsorption sites and increased the release of adsorbed pollutants with improved desorption performance.
KW - Adsorption
KW - Chitosan-polyvinyl alcohol composite hydrogel
KW - Graphitic carbon nitride
KW - Light regeneration
KW - Sulfamethoxazole
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U2 - 10.1016/j.seppur.2022.120973
DO - 10.1016/j.seppur.2022.120973
M3 - Article
AN - SCOPUS:85129859818
SN - 1383-5866
VL - 293
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 120973
ER -