Abstract
A linear bacterial β-1,3-glucan, curdlan, was functionalized by ethylenediamine tetraacetic dianhydride (EDTAD) to form a porous insoluble material (Curd-E) in this study. Various technics, including FTIR, solid state 13C NMR, XRD, TGA, and SEM, were combined to determine the chemical and microscopic structure of the resultant. It's suggested that EDTAD esterified and cross-linked C6-hydroxyl groups of curdlan molecules to form the porous Curd-E. Moreover, Curd-E showed high adsorption capacity on Cu2+ (224.97 mg/g, pH 6.0) and Zn2+ (255.64 mg/g, pH 4.5) in comparison with the biomaterial and mineral based adsorbents. Data also indicated that the site affinity of Curd-E for cations was in the order of chelation > coordination/complexation > ion exchange. Besides, 2-site Langmuir and 2-step Freundlich isotherms gave the best interpretation for Cu2+ adsorption and Zn2+ adsorption, respectively. Since the adsorption capacity maintained 91.8% ± 0.8% after five cycles of adsorption/desorption, it is believed that Curd-E is suitable for removal of divalent cations in wastewater as a novel candidate.
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This work is supported by the research grants from the Shandong Provincial Key Laboratory of Microbiological Engineering (No. 0308060402), and the Fundamental Research Funds for the Central Universities (No. 30915011101). The authors thank these organizations for financial supports.
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Zhu, T., Zhu, D. & Li, J. A Porous Material Made from Curdlan by EDTAD Functionalization Shows High Adsorption Capacity on Removal of Cu2+ and Zn2+ from Water. J Polym Environ 28, 1368–1377 (2020). https://doi.org/10.1007/s10924-020-01691-1
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DOI: https://doi.org/10.1007/s10924-020-01691-1