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    Water-Insoluble Cyclodextrin-based nanocubes for highly efficient adsorption toward diverse organic and inorganic pollutants

    Year: 2022

    Journal: Sep. Purif. Technol., Volume 291, JUN 15

    Authors: Jia, Jie; Wang, Chenyang; Li, Yiju; Wu, Dequn; Yu, Jianyong; Gao, Tingting; Li, Faxue

    Organizations: Fundamental Research Funds for the Central Universities [2232020D-13]; Shanghai Sailing Program [20YF1400700]; National Natural Science Foundation of China (NSFC) [52003045]; Application Fundamental Projects of China National Textile and Apparel Council

    Keywords: Cyclodextrin; Nanocube; Adsorption-desorption; Organic and inorganic pollutants; Real water test

    Cyclodextrin (CD), as a naturally green starch derivative, is a promising candidate for water treatment through adsorption. Unfortunately, the soluble nature of CD in water limits its application greatly. In this work, a water insoluble CD-based nanocube (CL-CD@PNC) with high adsorption performance toward dissolved pollutants is first developed through a facile two-step route. The prepared CL-CD@PNC has high water stability and welldefined cubic morphology with a porous structure. Additionally, the CL-CD@PNC nanocubes present prominent adsorption performance with the maximum adsorption capacities of 2173.21, 998.54, and 966.06 mg g(-1) towards methylene blue (MB), bisphenol A (BPA), and Pb(II), respectively, which is much higher than those of many other adsorbents. The adsorption equilibrium can be achieved within 10 and 30 s for MB and Pb(II) adsorption, respectively, indicating the ultrafast adsorption rate. These adsorption processes are ascribed to the pseudo-second-order adsorption kinetics and Langmuir isotherm model, signifying the chemical and monolayer adsorption process. Moreover, the removal efficiency of the CL-CD@PNC nanocubes towards three different pollutants remains over 85% even after 10 recycles of regeneration. The superior adsorption performance of our CL-CD@PNC is attributed to the synergetic effect of host-guest interaction, electrostatic adsorption, hydrogen bond interaction, and chelation. More importantly, the applicability of CL-CD@PNC is successfully demonstrated under real industrial wastewater conditions. This work provides a promising strategy to prepare the water insoluble CD-based adsorbent with a regular cubic structure, which can be potentially applied in the practical applications of industrial wastewater treatment.
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