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Efficient adsorption of Mn(Ⅱ) by layered double hydroxides intercalated with diethylenetriaminepentaacetic acid and the mechanistic study
基金项目:the National Natural Science Foundation of China;the Key Project in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period;the Fundamental Research Funds for the Central Universities,HUST;Huazhong University of Science & Technology Analytic and Testing Centre is thanked for the advanced analytic operations
摘    要:In this study, greatly enhanced Mn(II) adsorption was achieved by as-synthesized diethylenetriaminepentaacetate acid intercalated Mg/Al layered double hydroxides(LDHsDTPA). The adsorption capacity of LDHs-DTPA was 83.5 mg/g, which is much higher than that of LDHs-EDTA(44.4 mg/g), LDHs-Oxalate(21.6 mg/g) and LDHs(28.8 mg/g). The adsorption data of aqueous Mn(II) using LDHs-DTPA could be well described by the pseudosecond order kinetics and Langmuir isotherm model. Thermodynamics study results also showed that the adsorption process of Mn(II) by LDHs-DTPA was exothermic as indicated by the negative ΔH value. Furthermore, based on the structural, morphological and thermostable features, as well as FT-IR and XPS characterizations of LDHs-DTPA and the pristine LDHs, the adsorption mechanism of Mn(II) was proposed. The carboxyl groups of DTPA were proposed to be the main binding sites for Mn(II), and the hydroxyl groups of LDHs also played a minor role in the adsorption process. Among the three common regeneration reagents, 0.1 mol/L Na_2CO_3 was the best for reusing LDHs-DTPA in Mn(II)adsorption. Besides, the Mn(II) adsorption performance could be hindered in the presence of typical inorganic ions, especially cations. Further specific modifications of LDHs-DTPA are suggested to get more selective adsorption of Mn(II) in practical applications.

收稿时间:2019/4/11 0:00:00

Efficient adsorption of Mn(II) by layered double hydroxides intercalated with diethylenetriaminepentaacetic acid and the mechanistic study
Authors:Mingjie Huang  Yingxin Zhang  Wei Xiang  Tao Zhou  Xiaohui Wu  Juan Mao
Institution:1. School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China
Abstract:
Keywords:Layered double hydroxides  Diethylenetriaminepentaacetate acid (DTPA)  Mn(II)  Adsorption  Inorganic ions
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