CHEMOSPHERE
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2021
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IF 7.086
Fenglei Liu,Shan Hua,Chao Wang,Baowei Hu
Herein, using dialdehyde waste paper (DAWP) as a cross-linking agent to immobilize persimmon tannin (PT) was first used to remove the U(VI) and Cr(VI) via the “waste control by waste” concept. The microscopic and macroscopic surface properties of the as-prepared adsorbent was characterized by the advanced characterization techniques. Factors that affected the elimination process such as variable pH, coexistence ions and equilibrium time were investigated by batch techniques. The results showed that the maximal removal capacities of U(VI) and Cr(VI) on DAWP-PT were 242.3 mg/g (pH = 6.0) and 178.7 mg/g (pH = 2.0) at 298 K, which exhibited competitiveness with most of the reported solid materials. Meanwhile, adsorption data were fitted perfectly to the Langmuir and Pseudo-second-order equations, which indicated that the monolayer and homogenous chemisorption dominated the removal process. The SEM-EDX, DFT and XPS analysis conformed that adsorption of U(VI) was mainly via surface complexation, while the elimination of Cr(VI) was a redox reaction process, and about 65.33% of Cr(III) and 34.67% of Cr(VI) co-existed onto the surface of DAWP-PT. Thus, this study would provide a high-efficiency and low-cost adsorbent for radionuclide and heavy metal treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
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2020
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IF 3.104
Lin Gao,Zhongmin Wang,Chaoke Qin,Zhenming Chen,Mingmin Gao,Na He,Xi Qian,Zhide Zhou,Guiyin Li
Rare earth elements (REEs) are used for the development of new energy materials owing to their intrinsic physicochemical property. However, excess REEs in water threaten the safety of animals, plants and humans. An efficient way to separate REEs from the water is therefore needed. In this study, a biosorbent consisting of iron oxide (Fe 3 O 4 ), persimmon tannin (PT), and graphene oxide (GO) as Fe 3 O 4 /PT/GO was prepared, and the adsorption of trivalent erbium (Er 3+ ) ions from aqueous solution was investigated. The adsorption process for Er 3+ ions conforms to pseudo-second order kinetic and the Langmuir isotherm model behavior. Thermodynamic studies indicate that the adsorption process is spontaneous and endothermic. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier-transform infrared (FT-IR) spectroscopy, Brunauer-Emmett-Teller (BET) analysis, and vibrating sample magnetometer (VSM) were used to assess the adsorption mechanism of Er 3+ ions onto the Fe 3 O 4 /PT/GO biosorbent. A combination of electrostatic interactions , redox reactivity and chelation are responsible for adsorption of Er 3+ ions on the Fe 3 O 4 /PT/GO biosorbent. The magnetic Fe 3 O 4 /PT/GO biosorbent can be easily separated under the magnetic field for effective recycle of Er 3+ ions from aqueous solution. Therefore, this new biomass composite holds great promise for wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52012
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IF 3.125
Yongxian Shen,Hongjun Zhou,Qingbing Guo,Hongchao Hu
In this study, the persimmon tannin powder modified polyurethane foam (PTP-PUF) was synthesized. The morphology of the foam was observed by SEM, the thermodynamic stability and mechanical properties of PTP-PUF were discussed for application. The effect of persimmon tannin powder content and initial pH on Cu(II) and Pb(II) biosorption on PTP-PUF was investigated. The adsorption equilibrium data for Cu(II) and Pb(II) fitted the Freundlich model and Langmuir model well, respectively. And the maximum adsorption capacity of PTP-PUFs for Cu(II) and Pb(II) ions were 96.06 and 112.2 mg/g at pH 5 and 323 K. The kinetic data was tested using pseudo-first-order and pseudo-second-order models. The results suggested that the pseudo-second-order model was the best one to describe the adsorption behavior of Cu(II) ( R 2 > 0.997) and Pb(II) ( R 2 > 0.985) onto PTP-PUF.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
TOXICON
·
2013
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IF 2.924
Ying Zhang,Li Zhong,Bin Zhou,Jin-yu Chen,Chun-mei Li
To more fully understand the mechanism by which persimmon tannin (PT) inhibited phospholipase A 2 (PLA 2 ) and the structural requirements of PT for the inhibition, the interactions between PLA 2 and seven characteristic structural elements of PT including epigallocatechin-3-gallate (EGCG), myricetin, epicatechin-3-gallate (ECG), epicatechin-3-gallate-(4β → 8, 2β → O → 7)-epicatechin-3-gallate (A-type ECG dimer), epigallocatechin-3-gallate-(4β → 8, 2β → O → 7)-epigallocatechin-3-gallate (A-type EGCG dimer), epicatechin-(4β → 8, 2β → O → 7)-epicatechin (A-type EC dimer) and epicatechin-(4β → 8)-epicatechin (B-type EC dimer) were studied by enzymatic and spectroscopic methods. Molecular docking was also used to explore the possible residues involved in the interactions. The results revealed that A-type EGCG dimer and A-type ECG dimer showed higher inhibitory effects on the catalytic activity of PLA 2 than monomers and B-type dimer. They induced greater conformational changes in PLA 2 than other structural elements. In addition, molecular docking studies revealed that expect for lysine residues, other residues such as Trp18, Try27, Gly29, His47 and Tyr63 were involved in the interactions. We propose that A-type EGCG and ECG dimer units may be structural requirements for the interaction between PT and PLA 2 . Our data provide an additional structural basis for anti-PLA 2 activity of persimmon tannin.
研究领域:
生物化学
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药理学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）