Applied Sciences-Basel
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2021
·Vol. 11
·期 20
·9684
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IF 2.679
Wei Luo,Huiting Lin,Zhihao Wu,Jingteng Chen,Ruiyang Chi,Xiaoxia Ye,Jie Chen
Plant tannins have the ability to form stable complexes with metal ions, while microporous membranes have low pressure drop and high flux characteristics. Combining these two materials, a new type of tannin-immobilized membrane (M-TAN) adsorption material has been developed. The PA-BWT, PVDF-BWT, CELL -BWT, and PA-AA-BWT were prepared using different types of microporous membranes as substrates, which maintained the porous structure of the membranes and had the characteristics of high flux and fast filtration rate. The surface contact angle and pure water flux analysis showed that the introduction of tannin with multi-phenolic hydroxyl groups increased the hydrophilicity and water flux of the M-TANs. The adsorption performance shows that the adsorption capacity of four kinds of M-TANs for UO22+is in the order of PA-BWT > PA-AA-BWT > PVDF-BWT > CELL-BWT, and PA-BWT has the largest adsorption capacity of 0.398 mmol g−1. In addition, the adsorption isothermal and kinetic data of PA-BWT were well fitted by the Langmuir equation and the Elovich model, respectively. The negative values of ΔG for UO22+adsorption on PA-BWT indicated that adsorption is a spontaneous and favorable process. These facts indicate that PA-BWT can be used as a low-cost adsorbent for effective removal of UO22+from aqueous solutions.Keywords:plant tannins;microporous membranes;immobilized tannins;membrane adsorption
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Dongqing Zhao,Lijuan Zhang,Yao Lu,Haotian Li,Saiqi Wang,Haikuan Yuan,Xijian Liu,Chengyin Wang,Xueyan Zhu,Jie Lu
A tetraethylenepentamine modified magnetic cellulose nanocrystal composites (Fe3O4@CNC-TEPA) was prepared by the coprecipitation method and Schiff base reaction, which could adsorb Congo red (CR) efficiently. The morphology and structure of the nanoparticles were characterized by atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), zeta potential (ZETA), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET). Subsequently, the Fe3O4@CNC-TEPA adsorbed CR was investigated by comparative experiments, selective adsorption experiments, effect of pH, effect of adsorbent dosage, adsorption isotherms, thermodynamics parameters, adsorption kinetics, leaching experiments, desorption and reusability experiments. Results revealed the fact that the nanoparticles showed excellent adsorption capacity of CR (1049 mg g−1) due to the abundant hydroxyl and amino groups on the surface of the Fe3O4@CNC-TEPA. The adsorption process was best described by the the Langmuir equation and pseudo-second-order kinetic model. Moreover, the Fe3O4@CNC-TEPA loaded with CR can be recycled with NaOH solution easily, which can be used repeatedly for CR adsorption. After six cycles, the adsorption capacity was still about 81.5% of the original particles’. The environmentally friendly nanoparticles have great application prospects as adsorbents for removing CR.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Lingyuan Chen,Jiali Tang,Xinyue Zhang,Shixing Wang,Zhaogang Ren
A novel benzothiazole modified chitosan ( BCS ) with excellent Au(III) adsorption performance and selectivity was prepared as adsorbents. The structure and morphology of the adsorbents were characterized by FTIR, SEM, XRD and XPS. The adsorption property of the adsorbents for Au(III) were investigated under different reaction time, initial concentration of Au(III), temperature, pH and coexisting ions. The maximum adsorption capacity of BCS for Au(III) was 1072.22 mg/g at 298 K and optimal pH = 4, which was better than that of other adsorbents reported in literature. The adsorption kinetics and isotherm models fit the pseudo-second-order and Langmuir equations. This shows that the adsorption process of Au(III) is a monolayer chemical adsorption. The adsorption process can proceed spontaneously and belong to the endothermic reaction according to the thermodynamic results. The excellent adsorption performance is mainly attributed to the ion exchange and chelation of the nitrogen, sulfur and oxygen groups on the adsorbent with gold ions. Significantly, BCS has excellent selectivity toward Au(III) and remarkable recycle performance. With the high adsorption capacity, excellent selectivity and outstanding reusability, the BCS adsorbent could be a promising candidate to adsorb Au(III) from wastewater.
研究领域:
材料科学
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环境化学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2015
·
IF 0.669
Wenming Yang,Yang Cao,Xiaoni Ni,Weihong Hunag,Wanzhen Xu
We herein report the successful synthesis of molecularly imprinted polymers (MIPs) by surface imprinting methods. The synthesized MIPs were subsequently used to selectively adsorb indole from fuel oil. A new polymerization method (SR&NI ATRP), which combines the atom transfer radical polymerization (ATRP) and reverse atom transfer radical polymerization methods, is applied for the preparation of indole–MIPs. The indole–MIPs prepared have large specific surface area and porosity, as revealed by a series of morphology characterization studies. Static adsorption data indicate that the adsorption capacity of indole–MIPs was 55.8 mg g−1, and the adsorption equilibrium is achieved in 120 minutes. According to the results of thermodynamic analysis, the adsorption process is spontaneous. In addition, results of kinetics analysis indicated that the adsorption performances of indole–MIPs obey pseudo-second-order model. The Sips and Langmuir equations better fitted with the experimental isothermal data than the Freundlich equation. The selectivity of indole–MIPs was significant and the adsorbent could be reused even after five regeneration cycles.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）