Investigating the zinc ion adsorption capacity of a chitosan/β-cyclodextrin complex in wastewater

• Published in: E3S web of conferences Vol. 143; p. 2006
• Main Authors: Liu, Jiaxin, Wang, Siqi, Ding, Xiuqing, Fu, Jingyi, Zhao, Jun
• Format: Journal Article
• Language: English
• Published: EDP Sciences 01.01.2020
• ISSN: 2267-1242; 2267-1242
• DOI: 10.1051/e3sconf/202014302006

To decrease the amount of Zn 2+ in industrial waste water, in this study, β-cyclodextrin (β-CD) was first modified and then used to obtain a β-cyclodextrin polymer (β-CDP). The effects of reaction temperature and reaction time of β-CD with citric acid (CA), polyethylene glycol 400 (PEG-400), and disodium hydrogen phosphate (NaH 2 PO 4 ) on the amount of β-CDP produced were investigated. The results showed that at a reaction temperature of 145 °C and a reaction time of 4.5 h, 6.58 g of β-CDP was produced. Then, chitosan (CTS) was crosslinked with β-CDP using glutaraldehyde to prepare a chitosan/β-cyclodextrin (CTS/β-CDP) complex. The mass ratio of CTS to β-CDP, reaction temperature, reaction time, and amount of added glutaraldehyde were used as the main variables to examine the Zn 2+ adsorption rate and adsorption capacity of the composites prepared in this study. The optimum experimental conditions were as follows: a mass ratio of 3:10, a reaction temperature of 80 °C, a reaction time of 90 min, and 2 mL of glutaraldehyde. Under these optimal conditions, the adsorption amount and adsorption rates of Zn 2+ using CTS/β-CDP complex were respectively 97.70 mg·g -1 and 78.92%.