JOURNAL OF POLYMER ENGINEERING
·
2016
·Vol. 37
·期 4
·391-399
·
IF 0.631
Chun-yu Wang,Yu-huan Bu,Hua-jie Liu,Sheng-lai Guo
The core-shell oil absorption material (OAM) with fumed silica shell was achieved from Pickering polymerization. The modified fumed silica wall could well stabilize both Pickering emulsion and Pickering polymerization. The particle size of encapsulated OAMs decreased with the increasing concentration of fumed silica and remained unchanged when the concentration was more than 1 wt.%. This fumed silica shell had little effect on the oil absorption rate of OAM. The importance was that the shell reversed the surface property and improved the alkali resistance of OAM. We believe that our core-shell OAMs could reach the self-healing ability of the oil well cement.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2021
·
IF 5.485
Wenyi Ma,Wanzheng Ren,Xiaoyu Bai,Jian Pan,Lilan Huang,Qinglin Huang,Zengge Guo,Xinyan Wang
Poly (vinylidene fluoride) (PVDF) has been widely implemented in fabricating membranes, but pure PVDF membrane need to be modified by blending or copolymerization to cope with its weak alkali resistance. In this work, the function of chlorotrifluoroethylene (CTFE) chain segment was studied, PVDF/ECTFE blending membranes and poly (vinylidene difluoride- co -chlorotrifluoroethylene) (PVDF-CTFE) membranes were prepared via non-solvent induced phase separation (NIPS) method. The effect of modification methods and solvents on the membrane morphology, micropore and physicochemical structure, permeability, ultrafiltration performance, anti-fouling property and alkali resistance were investigated systematically. More than that, the surface charge and roughness of membrane prepared by different solvents were determined in the varying environment to better understand the anti-fouling property. The result presented that the comprehensive properties of PVDF-CTFE copolymerization membrane were better than that of PVDF/ECTFE blending membrane. The microporous structure of PVDF-CTFE membrane surface and sublayer was optimized by adjusting the solvent. The effect of solvent on the rate of L-L de-mixing during phase inversion was investigated from thermodynamic and kinetic factors. The prepared PVDF-CTFE membrane using N -methylpyrrolidone (NMP) as solvent broke the trade-off between the permeability and selectivity, so it was simultaneously possessed superior pure water flux (306.5 L·m −2 ·h −1 ) and higher BSA rejection rate (98.4%). The combination of NMP and PVP significantly decreased the rate of phase inversion without changing the polymer content, and provided a simple and feasible improvement idea for non-solvent-induced phase separation. In addition, the PVDF-CTFE membranes possessed better alkali resistance compared to PVDF membranes, demonstrating its promising potential in harsh environment.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuan Xia,Daojiang Zhu,Chang Huang,Tingting Xu,Fangmeng Sheng,Xingya Li,Tongwen Xu
Alkali holds a pivotal role in the chemical industry, however, the substantial discharge of alkaline wastewater causes a severe waste of resources and environmental pollution. Conventional polymer membranes have ether bonded backbones and form randomly assembled nanochannels, suffering from a weak alkali resistance and a low hydroxide ion selectivity. Covalent organic frameworks (COFs), known for their robust framework structure, highly ordered channels, and tunable channel chemistry, have been considered as the competent candidate for alkaline-resistant membranes for selective hydroxide ion separation. Herein, we fabricate a β-ketoenamine COF (TpTAPB) membrane with a high alkaline resistance via the interfacial growth strategy. After post-sulfonation, the negatively charged channels of sulfonated TpTAPB membrane allows OH - with smaller size and lower charges to pass through while repulsing WO 4 2- ions, achieving a selectivity of OH - /WO 4 2- up to ∼ 60 and surpassing commercial and most reported polymeric membranes. This work expands the application scope of COF membranes in selective alkali separation.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
RADIOCHIMICA ACTA
·
2018
·Vol. 106
·期 9
·719-731
·
IF 1.202
Kun Tian,Jinling Wu,Jianlong Wang
The adsorptive extraction of uranium (VI) was investigated using multiwalled carbon nanotubes functionalized with dihydroimidazole (DIM-MWCNTs). Dihydroimidazole was grafted onto the surface of MWCNTs via silane coupling agent, N-(3-triethoxysilylpropyl)-4,5-dihydroimidazole. The new adsorbent was characterized using Fourier transform infrared, scanning electron microscope and X-ray Photoelectron Spectroscopy. DIM-MWCNTs were compared with MWCNTs and amidoxime modified MWCNTs (AO-MWCNTs) for uranium adsorption under seawater conditions. The adsorption capacity of uranium onto DIM-MWCNTs was 54.9 mg g −1 at 298 K, which was about 4 times of MWCNTs and similar to that of AO-MWCNTs. Compared with AO-MWCNTs, DIM-MWCNTs were more suitable for seawater pH, and less affected by vanadium. Although DIM-MWCNTs were more affected by carbonate than AO-MWCNTs, DIM-MWCNTs maintained a higher adsorption capacity than AO-MWCNTs due to its alkali resistance. Pyridine-like nitrogen (CH=N–CH) contributed to the adsorption of uranium. The results suggested that DIM-MWCNTs were a potential effective adsorbent for the separation of uranium under seawater condition.
研究领域:
环境科学
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材料科学
·
核工程
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 11
·2973-2983
·
IF 2.372
Luo Wei,Du Hui-Jun,Bonku Emmanuel Mintah,Hou Ya-Li,Li Ling-Ling,Wang Xiao-Qiang,Yang Zhong-Hua
Abstract Enantiopure alcohols have received much attention due to their widespread use as pharmaceutical intermediates. In the asymmetric biosynthesis of enantiopure alcohols, the excellent performance of carbonyl reductase makes it be the best choice as the biocatalysts. In this work, an alkali-tolerant carbonyl reductase ( Bs CR, encoded by yueD ) from Bacillus subtilis (strain 168) was obtained through gene mining, and successfully heterologously expressed in Escherichia coli with pET-32a. Bs CR showed excellent alkali resistance and even can keep more than 70% of its peak activity after incubation in Tris–HCl buffer at pH 9.0 for 40 h. The Michaelis constants and maximal velocity of the Bs CR to NADPH (A) and ethyl 4-chloroacetoacetate (B) are \(K_{m}^{A}\) = 5.390 × 10 −2 mmol/L, \(K_{m}^{B}\) = 1.855 mmol/L, and \(V_{max}\) = 147.3 μmol·min −1 ·mg −1 , respectively. Applying the E. coli BL21(DE3)/pET-32a-yueD to catalyze asymmetric reduction of ethyl 4-chloroacetoacetate and acetophenone, the yield of S -CHBE reached 89.9% and S -1-phenyl ethanol reached 66.7%, and e.e. of both products reached more than 99%. This work provides a novel CR for asymmetric reduction. Graphic Abstract A carbonyl reductase ( Bs CR) and its gene were identified through gene mining, and overexpressed in Escherichia coli BL21(DE3) for whole-cell biocatalytic asymmetric reduction
研究领域:
生物技术
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生物化学
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药物科学
·
酶学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Kaifeng Gu,Kaizhen Wang,Yong Zhou,Congjie Gao
Lignin is a widely used biomass material and has great application potential in papermaking, textile, petrochemical industry, etc. However, the traditional separation and extraction method for the lignin system has some disadvantages in energy consumption and separation effect, which greatly limited the application of lignin. The rapid development of nanofiltration (NF) membranes provides new ideas for solving this problem. The PEI/TGIC membrane with great alkali resistance (pH 7–14) by cross-linking polyethyleneimine (PEI) and triglycidyl isocyanurate (TGIC) was developed in this work. The influencing factors of membrane surface characteristics were discussed and membrane preparation parameters were optimized. The optimized PEI/TGIC membrane (prepared with 0.02% TGIC and 0.8% PEI) had the characteristics of high permeability and selectivity under low pressure (2 bar). The PEI/TGIC membrane was stable to the removal of PEG 1500 in an alkaline environment (pH 7–14). For lignin lye, the PEI/TGIC membrane could intercept the lignin (rejection>95%) while allowing the sodium hydroxide to almost completely penetrate. Under the operating pressure of 2 bar, the lye permeation flux could be maintained at 22 L m −2 h −1 . This work provided new ideas for the application of nanofiltration membranes and the treatment of lignin lye.
研究领域:
化学工程
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材料科学
·
环境工程
·
生物技术
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zejun Zhang,Zhansheng Wang,Qingji Wang,Hua Zhang,Yuqi Tang,Qian Qu,Liwei Shen,Dong Xiang,Yuanzhu Mi,Xuemin Yan
A multi-branched trinuclear ionic liquid demulsifier (EDHBr-IL) was synthesized using glycerol triglycidyl ether, di- n -hexylamine and 1-bromododecane as raw materials using a simple “one-pot” method. Its structure was characterized by FT-IR, 1 H NMR and 13 C NMR spectra. EDHBr-IL exhibited a favorable demulsifying performance in W/O emulsions at lower temperature. The demulsifying efficiency (DE) of 300 mg/L of EDHBr-IL at 50 °C reached 90 % with for 2 h. It showed an excellent acid, alkaline and salt resistance. A relatively high DE was achieved at a pH range of 4–12 and a salinity of 10,000 mg/L. In addition, the demulsification mechanism was explored based on interfacial properties and micro examination. EDHBr-IL has substantial potential for the demulsification of W/O emulsions due to its simple and safe preparation, and performance comparable to that of with commercial demulsifiers.
研究领域:
化学工程
·
材料科学
·
胶体与表面化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hailiang Liu,Yonghui Wang,Yang Qin,Qinglin Huang,Kaikai Chen,Wei Shu,Changfa Xiao
In this study, we proposed a novel interfacial polymerization (IP) method for porous graphene-based sheets (PGS) with 2D structure by recombining of amino graphene quantum dots (AGQDs) at the two phases interface, and then a large-area ultrathin composite films with excellent permeability and high selectivity were prepared by in-situ sealing technology with polyamide (PA) for the first time. Adjusting the pH of AGQDs solution could promote and regulate the formation of PGS with a lamella diameter of 2 μm, an ultrathin thickness of 3.2 nm and pore size of 2.71 nm, which showed a willow-leaf-like shape with a typical 2D porous structure. Then, the PGS at the interface was sealed in-situ by PA layer generated by injecting piperazine (PIP) in the IP process to form PGS/PA composite membrane. When the PGS synthesis time and PIP concentration were reached to 60 s and 0.02 w/v% respectively, the prepared PGS/PA composite membrane exhibited the best comprehensive properties, with an ultrathin thickness of 18.6 nm, super hydrophilic surface, excellent stability and strong alkali resistance. At this condition, the permeation flux of PGS/PA composite membrane could reach 28.4 L·m −2 ·h −1 ·bar −1 , which was over 300% of the original PA composite membrane (9.1 L·m −2 ·h −1 ·bar −1 ), while the rejection of Congo red was maintained more than 99.4%, which successfully overcame the “trade-off” effect.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
膜科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）