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  • Title: Zr4+ cross-linked chitosan-thiourea composite for efficient detoxification of Cr(VI) ions in aqueous solution.
    Author: Xu C, Xu Y, Zhong D, Chang H, Mou J, Wang H, Shen H.
    Journal: Carbohydr Polym; 2022 Nov 15; 296():119872. PubMed ID: 36087961.
    Abstract:
    The effective strategy to solve the problems of low mechanical strength, low adsorption efficiency and poor stability of chitosan is to modify it. In this work, Zr4+ cross-linked chitosan-thiourea (CS-thiourea-Zr) composite was synthesized for the first time and used to remove Cr(VI). CS, ZrO, CN bonds in FTIR spectrum and Zr, S elements in XPS spectrum, SEM-mapping and EDS results verify the successful preparation of CS-thiourea-Zr. The main mechanism of Cr(VI) removal by CS-thiourea-Zr includes electrostatic action, ion exchange, reduction and complexation. The adsorption of Cr(VI) is enhanced by electrostatic adsorption and ion exchange, 80.6 % of the adsorbed Cr(VI) is reduced to Cr(III) by -OH group, and the adsorption of Cr(III) is enhanced by COO- group and CS bond. The maximum adsorption capacity of CS-thiourea-Zr is 246.72 mg g-1 at 298 K and pH = 2.0. CS-thiourea-Zr has excellent acid-base resistance (suitable pH 2-12) and reusability.
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