Preparation and application in removal of Cu2+ from aquaculture tailwater for thermoresponsive starch ether/carboxymethyl starch composite hydrogel

doi:10.16535/j.cnki.dlhyxb.2023-238

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Journal of Dalian Fisheries University ›› 2024, Vol. 39 ›› Issue (3) : 462-469. DOI: 10.16535/j.cnki.dlhyxb.2023-238

Preparation and application in removal of Cu2+ from aquaculture tailwater for thermoresponsive starch ether/carboxymethyl starch composite hydrogel

JIANG Shuo，SUN Meng，SUN Hui，ZHANG Liping，HE Tianxiao，LI Shunuo，LI Miao，LIU Ying，TIAN Ye*

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Abstract

A thermoresponsive hydrogel composed of 2-hydroxy-3-isopropoxypropyl starch (HIPS) and carboxymethyl starch sodium (CMS) was synthesized via cross-linking with hybrid crosslinkers including ethylene glycol diglycidyl ether (EDCE) and calcium chloride (CaCl2) for removal of copper ions from aquaculture tailwater. The internal structure, morphology and thermoresponsive performance of the hydrogels were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The adsorption behavior of HIPS/CMS composite hydrogel for Cu2+ in aquaculture tailwater was explored under different adsorption capacities of Cu2+, pH, and Cu2+ concentrations. The results showed that the HIPS/CMS hydrogel had excellent thermoresponsive performance, with the significantly shrunken volume at temperature of higher than its volume phase transition temperature (VPTT, 34.1 ℃), and decrease in the swelling rate from 62.1 times to 33.6 times. HIPS/CMS hydrogel has desirable adsorption properties for Cu2+in aquaculture tailwater, with the maximal adsorption capacity of 25.2 mg/g. The adsorption process of Cu2+was conformed to the Langmuir model. The thermoresponsive of the hydrogel was used to realize the recovery and reuse of HIPS/CMS hydrogel, with the Cu2+ adsorption capacity of 15.1 mg/g after five adsorption-desorption cycles. The findings indicated that the HIPS/CMS composite gel prepared in this study had a good effect on the removal of Cu2+ and was friendly reused for environment.

Key words

aquaculture tailwater / Cu2+ adsorption / hydrogel / thermoresponsive / starch derivative

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JIANG Shuo, SUN Meng, SUN Hui, ZHANG Liping, HE Tianxiao, LI Shunuo, LI Miao, LIU Ying, TIAN Ye. Preparation and application in removal of Cu2+ from aquaculture tailwater for thermoresponsive starch ether/carboxymethyl starch composite hydrogel[J]. Journal of Dalian Fisheries University, 2024, 39(3): 462-469 https://doi.org/10.16535/j.cnki.dlhyxb.2023-238