Study on the Performance of Composite Adsorption of Cu 2+ by Chitosan/β-Cyclodextrin Cross-Linked Zeolite

Qiuqiu Xiong and Fenge Zhang
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Qiuqiu Xiong: School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
Fenge Zhang: School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China

Sustainability, 2022, vol. 14, issue 4, 1-17

Abstract: In order to remove Cu 2+ from wastewater, a kind of microsphere adsorbent (SCDO) with high efficiency for Cu 2+ adsorption was prepared by the microdrop condensation method, where chitosan (CTS) and sodium alginate (SA) were used as the matrix to crosslink β-cyclodextrin (β-CD) and zeolite (Zeo). The structure and properties of SCDO were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Upon that, the adsorption performance of SCDO for Cu 2+ was studied, in which the effects of pH, initial concentration, dosage, adsorption time and temperature were investigated. The results showed that the removal rate of Cu 2+ reached 97.08%, and the maximum adsorption capacity was 24.32 mg/g with the temperature at 30 °C, the dosage of SCDO at 12 g/L, the initial concentration of Cu 2+ at 100 mg/L, the pH of the solution at 6.0 and the adsorption time at 120 min, respectively. The adsorption process of Cu 2+ by SCDO occurred in accordance with quasi-second-order kinetics model and Langmuir adsorption isotherm. After four repeats of continuous adsorption and desorption, the regenerative removal rate of Cu 2+ could still reach 84.28%, which indicated that SCDO had outstanding reusability.

Keywords: microspheres; chitosan; β-cyclodextrin; zeolite; Cu 2+ adsorption (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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