Kinetic and Thermodynamic Study of Magnetic Separable β-Cyclodextrin Inclusion Complex with Organic Phosphoric Acid Applied to Removal of Hg2+

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• 作者：Lang Lin ; Changjun Zou
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2017
• 出版时间：February 9, 2017
• 年：2017
• 卷：62
• 期：2
• 页码：762-772
• 全文大小：612K
• ISSN：1520-5134

文摘

Magnetic β-cyclodextrin inclusion complex with phosphonobutanetricarboxylic acid (MNP-CD-PBTCA) was synthesized via step-by-step method to applied in removal of Hg²⁺ for the first time. TEM, SEM, XRD, TGA, FTIR, and BET proved the successful synthesis of core–shell structure of MNP-CD-PBTCA whose particle size ranged from 20 to 200 nm. In the single-factor experiments for adsorption of Hg²⁺, the maximum uptake capacity of MNP-CD-PBTCA attained was 77.59 mg·g^–1 after 150 min of adsorption while the pH was 4 and the temperature was kept at 55 °C. Langmuir isotherm study indicated the adsorption of MNP-CD-PBTCA for Hg²⁺ was in agreement with monolayer theory and was rate controlled by chemisorption; chelation interaction between phosphoric acid group and Hg²⁺ was suggested to be the main bonding effect in adsorption. Calculated thermodynamic results demonstrated that the adsorption process was a spontaneous and endothermic reaction with entropy-production; reusability study suggested that application of MNP-CD-PBTCA would be convenient, efficient, and economic.