摘要：
Metal organic frameworks (K-beta-CD-MOFs and Cs-beta-CD-MOFs) were obtained on the basis of beta-cyclodextrin and alkali metals (K and Cs) through a modified vapor diffusion method. This way was at 50 degrees C for 12 h and the toxic CTAB was replaced by green PEG20000. Meanwhile, the myricetin (MYR, 2 mg/ml) was adsorbed by the two crystals (30 mg) in the same condition at 35 degrees C for 42 h. The result displayed high adsorption capacity (282.39 mg/g and 308.65 mg/g). Furthermore, in order to explore adsorption mechanism, free energy of two crystals structure (K-beta-CD-MOFs and Cs-beta-CD-MOFs) and MYR was obtained through molecular docking, which explained adsorption mechanism by the hydrophobic interaction of the cavity and hydrogen bonding. (C) 2020 Elsevier Ltd. All rights reserved.
通讯机构：
[Liu, Huijun] U;Univ South China, Sch Chem & Chem Engn, 28 Changsheng Rd West, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Hunan Key Lab Design & Applicat Actinide Complexe, Hengyang 421001, Hunan, Peoples R China.
关键词：
Cyclodextrin-based nanosponge;Basic red 46;Rhodamine B;Adsorption;Environment-friendly
摘要：
Cyclodextrin-based nanosponges (CDNS) are a novel kind of polymers belonged to cross-linked derivatives of cyclodextrins, and they are safe, biodegradable materials with appreciable toxicity to the environment. In this work, CDNS were fabricated in one-step solvothermal method by beta-cyclodextrin (beta-CD) and diphenyl carbonate (DPC), for the removal of dyestuffs from wastewater using two of the familiar dyes as the model contaminant. It was systematically investigated by the influence of the amount of adsorbent, the molar ratio of beta-CD and DPC, pH, time, and initial concentration. Experimental results showed the maximum adsorption capacities of Basic red 46 and Rhodamine B were 101.43 mg/g and 52.33 mg/g, the adsorption behavior of two contaminants followed pseudo-second-order model and the Langmuir monolayer adsorption models. The differences in adsorption capacities on two model contaminants might due to the influence of dye structure. In conclusion, cyclodextrin-based nanosponges are a promising kind of environment-friendly materials in water treatment.
摘要：
In this paper, a green synthesized citric acid-crosslinked beta-cyclodextrin polymer (CA-beta-CD) was applied in removing uranium from aqueous solutions. Citric acid acts not only as cross-linker but also as functional groups for providing adsorption sites. The adsorption properties by varying experimental conditions were carried out by batch tests. The maximum adsorption capacity could reach 150 mg g(-1). Adsorption process was fitted better with the pseudo-second-order and Freundlich model. Thermodynamic studies proved that adsorption process was spontaneous and endothermic. More significantly, the polymer showed high selectivity for uranium and excellent reusability, demonstrating that CA-beta-CD can be utilized as a promising adsorbent for uranium.
关键词：
Drug loading;Emodin;K-CD-MOFs;Kinetic model;Quercetin
摘要：
Cyclodextrin metal-organic frameworks (K-CD-MOFs) based on renewable beta-cyclodextrin molecules (beta-CD) and alkali metals (K) was prepared by modified methanol vapor diffusion method at temperature of 50 degrees C for 6 h, and this can shorten the reaction time compared with the previous reported. Then the quercetin and emodin were selected to investigate the loading characteristics of K-CD-MOFs and drugs adsorption behavior was studied by changing the reaction time, temperatures, MOFs quality, initial drugs concentration and pH. In results, the crystals showed high adsorption (150.2 and 199.8 mg/g) when the reaction time both at 48 h, the temperatures of 35 and 45 degrees C, 30 mg K-CD-MOFs, the initial concentration of quercetin and emodin was 3.2 and 2.3 mg/ml and pH 6. Furthermore, the adsorption kinetics of drugs matched a pseudo-second-order model well and chemisorption of quercetin and emodin. Most importantly, XRD pattern analysis showed that the drug loading process did not destroy the crystallinity of the material. In summary, on the basis of optimizing the synthesis of K-CD-MOFs, the crystal stability and drugs adsorption properties were evaluated, which provided a basis for the potential drug delivery. (C) 2018 Elsevier Ltd. All rights reserved.
期刊：
IOP Conference Series: Materials Science and Engineering,2018年322:1-6 ISSN：1757-8981
通讯作者：
Long, Wei
作者机构：
[Long, Wei; Liu, Huijun; Yan, Xueming] Univ South China, Coll Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Long, Wei] Univ South China, Period Agcy, Hengyang 421001, Hunan, Peoples R China.;[Fu, Li] Hanzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Peoples R China.
通讯机构：
[Long, Wei] U;Univ South China, Coll Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Period Agcy, Hengyang 421001, Hunan, Peoples R China.
会议名称：
2017 International Symposium on Application of Materials Science and Energy Materials (SAMSE 2017) (2017材料科学应用与能源材料国际研讨会)
会议时间：
2017-12-28
会议地点：
上海
会议主办单位：
[Long, Wei;Liu, Huijun;Yan, Xueming] Univ South China, Coll Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.^[Long, Wei] Univ South China, Period Agcy, Hengyang 421001, Hunan, Peoples R China.^[Fu, Li] Hanzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Peoples R China.
会议论文集名称：
2017 International Symposium on Application of Materials Science and Energy Materials (SAMSE 2017) (2017材料科学应用与能源材料国际研讨会)论文集
摘要：
A new nano magnetic material Fe3O4@g-C3N4 was prepared by deposition reduction method, which performed good adsorption performance to uranium ion. Characterization results showed that the g-C3N4 particles were wrapped around the nano magnetic Fe3O4 particles, and the textural properties of this material was improved, so the adsorption performance to uranium ion was good. Adsorption experiments of this material demonstrated that the optimum pH value was 10, the optimum mass of adsorbent was 6.5 mg and the optimum adsorption time was 150 min in the initial concentration of 140 mg/L uranium ion solution system, and the maximum adsorption capacity was up to 352.1 mg/g and the maximum adsorption rate was more than 90%.
摘要：
The inclusion complex (sulfated-β-CD@NAA) of sulfated β-cyclodextrin and α-naphthylacetic acid was synthesized for adsorption of low concentrations of thorium from aqueous solutions. The structure and property of sulfated-β-CD@NAA were characterized by Fourier transform infrared spectroscopy, thermogravimetric, X-ray diffraction, proton nuclear magnetic resonance, specific surface area measurement and scanning electron microscopy. The characterization analysis confirmed the formation of new solid phase. The results indicated that α-naphthylacetic acid embedded into the cavity of sulfated β-cyclodextrin partly from the secondary face and the thermal stability of inclusion complex was significantly increased. The experiments were designed by Box–Behnken design combined with response surface methodology. The adsorption parameters of pH value, contact time, initial concentration were used as the independent variables and their effects were investigated on the Th(IV) adsorption capacity. Second-order polynomial regression models were derived and analysis of variance was utilized to judge the adequacy of the chosen models. The maximum Th(IV) adsorption capacity (12.75 mg g−1) was achieved under the following conditions: pH value 2.5, contact time 35 min, initial concentration 30 mg L−1. Prediction of models was in good agreement with experimental results. The experimental adsorption kinetic data followed a pseudo-second-order equation with the correlation of 0.9996, indicating the chemical adsorption. The obtained equilibrium isotherm data were fitted well with Langmuir model in the concentration range considered. The thermodynamic parameters (∆H0 < 0, ∆S0 < 0, ∆G0 < 0) indicated that the adsorption process was exothermic and spontaneous. Regeneration of Th(IV)-loaded sulfated-β-CD@NAA with 0.1 M HNO3 solution, and the regenerated sulfated-β-CD@NAA can be reused for adsorption of Th(IV).
摘要：
The adsorption of thorium(IV) was studied using a novel supramolecular polyrotaxane based on β-cyclodextrin derivatives. The effects of pH, contact time, Th(IV) initial concentration and adsorbents dosage on the adsorption of thorium(IV) by polyrotaxane were optimized using Box–Behnken design of response surface methodology. Analysis of variance and correlation coefficients showed that the predicted model was consistent with the experimental data well. The adsorption best fitted to the Langmuir model indicated that the adsorption process happened on homogeneous surface. The thermodynamic parameters (∆G
0 < 0, ∆H
0 > 0, ∆S
0 > 0) demonstrated that the adsorption of Th(IV) ions onto polyrotaxane was spontaneous and endothermic.
