JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Fufeng Cai,Wei Zhu,Jessica Juweriah Ibrahim,Guomin Xiao
This work demonstrated the possibility of hydrophobic ionic liquid tricaprylmethylammonium thiocyanate ([A336][SCN]) as a solvent in the separation by extraction of polyhydric alcohols from their mixtures with water. The knowledge of (liquid + liquid) equilibrium (LLE) of these mixtures is essential for the design of the extraction process. For this reason, the LLE data of the ternary systems {[A336][SCN] + water + glycerol, or ethylene glycol, or 1,2-propanediol, or 1,3-propanediol} were determined at T = 303.2 K and atmospheric pressure. The reliability of the tie-lines data was ascertained by applying the Othmer–Tobias equation, and the non-random two liquid (NRTL) model used to fit the experimental LLE data. The effectiveness of the extraction of polyhydric alcohols from water was evaluated using the solute distribution ratio and the selectivity. The extraction capability of [A336][SCN] was compared with that of other ILs. The results indicated that the [A336][SCN] was suitable for use as a solvent in (liquid + liquid) extraction of polyhydric alcohols from water.
研究领域:
化学工程
·
分离科学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2017
·Vol. 228
·期 6
·1-9
·
IF 1.702
Gan Guojuan,Qiu Lin,Wu Huan,Hong Huachang,Mazumder Asit,Pan Xiangliang,Liang Yan
Occurrence of halonitromethanes (HNMs) in drinking water has been a concern recently due to the potentially high human health risks of HNMs. Mechanisms of formation of HNMs during disinfection has remained controversial. The objective of this study was to investigate the effects of nitrite on the formation of trichloronitromethane (TCNM), a dominant HNM species occurring in chlorinated water. Polyhydroxy-phenols (hydroquinone, catechol, resorcinol, and phloroglucinol) and sugars (glucose, maltose, and lactose) were compared as surrogates/model compounds of common organic precursors of humic and non-humic substances in natural organic matter, respectively. The results showed that TCNM was not detectable after chlorinated sugars with the addition of nitrite. Upon chlorinating the polyhydroxy-phenols, TCNM formation varied greatly among different compounds, i.e., resorcinol > phloroglucinol > catechol >> hydroquinone. The results demonstrated that TCNM formation in the presence of nitrite was a function of aromaticity as well as the position and number of hydroxyl groups on the benzene rings of a compound, and the TCNM formation potential of humic substances was greater than that of non-humic substances. For catechol, resorcinol, and phloroglucinol, TCNM formation varied greatly with pH but generally remained stable with the increase of reaction time and temperature.
研究领域:
环境科学
·
公共卫生
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Songmiao Liang,Zhuyuan Wang,Yan Jin,Ning Zhao,Lijie Hu,Yi Hou,Jian Xu
Designing advanced adsorption materials from molecular structure is significant to separation science and technology. We develop an intriguing strategy to prepare free-standing polyester nanofilms with enhanced polyhydroxyl architectures. The key to this strategy is to manipulate polyphenols on the surface of a thermoreversible hydrogel substrate by a synergetic application of metal–organic coordination, interfacial polymerization, and disassembly. The nanofilms with thicknesses ranging from several nanometers to hundreds of nanometers were successfully prepared and systematically analyzed. Attenuated total reflection infrared spectroscopy and ζ-potential analysis show that the polyester nanofilms have asymmetrically enhanced polyhydroxyl architectures owing to the preprotection of hydroxyl groups by the metal–organic coordination. The adsorption properties of the polyester nanofilms to a variety of metal ions were further investigated with an emphasis on clarifying its potential in water purification. Strikingly, the polyester nanofilms show exceptional properties as sorbents with high adsorption capacity and ultrafast adsorption rates to those tested metal ions. The initial adsorption rates of the polyester nanofilms to boron and lead(II) even reach 6.65 and 149.4 mg·g–1·s–1, respectively, which are 10 to 120 times higher than those of reported membranes and commercial resins. The preparation strategy reported here is universal, which could be used to develop a series of promising adsorption materials through the adoption of different polyphenols and polyamines.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiming Yang,Kai Luo,Xingmei Lu,Wei He,Shuangfei Zhao,Zheng Fang,Yirong Feng,Ning Zhu,Kai Guo
Polyhydroxy compounds such as sugar alcohols /derivatives are high value chemicals with application potential in medicine, materials and other fields. Researches on preparation and selective extraction of polyhydroxy compounds have attracted wide attention in the world. However, the selective extraction of polyhydroxy compounds is still a major challenge. In this paper, hydrophobic ionic liquids (ILs) 1-butyl-3-methylimidazole bis(trifluoromethanesulfon)imide salt ([Bmim][Ntf 2 ]), 1-ethyl-3-methylimidazole bis(trifluoromethanesulfon)imide salt ([Emim][Ntf 2 ]) and 1-allyl-3-methylimidazole bis(trifluoromethanesulfon)imide salt ([Amim][Ntf 2 ])) were used for the dissolution and selective extraction of polyhydroxy compounds. In addition, the interaction between ionic liquids and polyhydroxy compounds was characterized and analyzed by NMR and contact angle analysis. The partition coefficients of polyhydroxy compounds in water and hydrophobic ionic liquids were also investigated. It was shown that among the ILs used, the solubility of polyhydroxy compounds fluctuated strongly (from 0 wt% to 19.50 wt%), and the solubility in [Amim][Ntf 2 ] was the highest. These hydrophobic ionic liquids showed strong selective extraction ability when fractionating mixtures composed of sugar alcohols and their dehydrated derivatives (1:1, w / w). The results showed that the purities of isosorbide and isomannide separated were more than 99.60 wt% and 99.99 wt% respectively. Polyhydroxy compounds dissolved in hydrophobic ionic liquids could be directly extracted by water without chemical modification. The regeneration rate of ionic liquids reached 93.22%−97.04%. The NMR characterization of the regenerated ionic liquid showed that water could fully extract polyhydroxy compounds dissolved in the ionic liquids and the structure of the regenerated ionic liquid did not change. It was promising to construct a green and efficient method for fractionating such polyhydroxy compounds based on hydrophobic ionic liquids, and it is suggested to further strengthen the research in this field.
研究领域:
化学工程
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材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
METABOLIC ENGINEERING
·
2017
·
IF 8.142
Lu Dai,Fei Tao,Hongzhi Tang,Yali Guo,Yaling Shen,Ping Xu
Primordial enzymes are proposed to possess broad specificities. Through divergence and evolution, enzymes have been refined to exhibit specificity towards one reaction or substrate, and are thus commonly assumed as “specialists”. However, some enzymes are “generalists” that catalyze a range of substrates and reactions. This property has been defined as enzyme promiscuity and is of great importance for the evolution of new functions. The promiscuities of two enzymes, namely glycerol dehydratase and diol dehydratase, were herein exploited for catalyzing long-chain polyols , including 1,2-butanediol, 1,2,4-butanetriol, erythritol , 1,2-pentanediol, 1,2,5-pentanetriol, and 1,2,6-hexanetriol. The specific activities required for catalyzing these six long-chain polyols were studied via in vitro enzyme assays , and the catalytic efficiencies were increased through protein engineering. The promiscuous functions were subsequently applied in vivo to establish 1,4-butanediol pathways from lignocellulose derived compounds, including xylose and erythritol. In addition, a pathway for 1-pentanol production from 1,2-pentanediol was also constructed. The results suggest that exploiting enzyme promiscuity is promising for exploring new catalysts, which would expand the repertoire of genetic elements available to synthetic biology and may provide a starting point for designing and engineering novel pathways for valuable chemicals.
研究领域:
生物化学
·
合成生物学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Detao Li,Wenqian Chen,Limin Zhou,Li Xu,Feiqiang He,Jerry Y Y Heng,Hamza Shehzad,Jinbo Ouyang
Understanding drug cocrystal formation and its competitive mechanism is important for improving the physicochemical properties of drugs. In this article, the cocrystal formation of polyhydroxy natural products and their competitive mechanisms are discussed through experimental screening and theoretical calculations. The formation conditions and types of cocrystals were determined based on efficient screening experiments of polyhydroxy natural product cocrystals. To investigate the difficulty and stability of cocrystal formation, competitive cocrystal experiments of polyhydroxy natural products were carried out simultaneously. By simulation of the electrostatic potential surface of molecules and the Hirshfeld surface of crystals, the mode of hydrogen bonding within the crystals was determined. The strength of hydrogen bonding was assessed based on the intermolecular interactions and energy framework within the crystal structure. A “substitution model” was constructed based on experimental results and theoretical calculations, which is of great significance for the prediction and design of natural product cocrystals and provides a feasible solution for improving the physicochemical properties of drugs.
研究领域:
药学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Lin Han,Tingting Wang,Jianchao Gong,Xin Li,Yaxiong Ji,Shifeng Wang
To address the competitive adsorption of complex wastewater components on organo-vermiculites (organo-Vts), multi-hydroxy containing gemini surfactants varying in alkyl chain length (G 12 , G 14 and G 16 ) are designed and applied for modifying Na-vermiculite (Na-Vt) targeted to the removal of co-existing MB and Pb(II). Organo-Vts exhibit enhanced hydrophobicity and enlarged interlayer spacing compared with Na-Vt, with the saturated modifier dosage reaching as low as 0.4 CEC of Na-Vt. Shorter alkyl chain induces suitable packing density and interlayer environment, endowing G 12 -Vt the highest adsorption capacity towards MB/Pb(II) compared with G 14 -Vt and G 16 -Vt (178.3/63.0 mg/g compared with 143.7/38.1 and 88.6/36.6 mg/g, respectively). Freundlich isotherm and PSO kinetic model are agreeable (the values of R 2 are higher than 0.98) with the endothermic adsorption processes . Notably, a simultaneous effect in binary-component system is obtained, and the maximum adsorption capacities of G 12 -Vt towards MB/Pb(II) reaching 349.9 and 124.5 mg/g, which are 1.96 and 1.95 times higher than single-component system, respectively. Combination of theoretical fitting and molecular simulation co-reveals the adsorption mechanism: the simultaneous effect is due to the providing of additional active sites by the adsorbed MB, which is stronger than that between Pb(II) and the modifier. Existence of π-ion interaction enhances the retention of Pb(II) for a further step. This work broadens a new research perspective for complex wastewater treatment and provides a deep understanding of the stimulative adsorption mechanism between dyes and metal ions .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2024
·
IF 3.3
Chenyang Gong,Lingling Cui,Dangsheng Xiong,Yan Ding
Osteoarthritis is a degenerative disease that is widely found in the elderly population, with a trend towards a younger age group in recent years. In the early stages of arthritis, patients are treated with hyaluronic acid injections and anti-inflammatory drugs. However, it has been found that hyaluronic acid can only play a supportive role and does not have a lubricating effect, and due to the absence of blood vessels, nerves, and lymphatic vessels in the articular cartilage, the oral anti-inflammatory drugs cannot reach the interface of the inflammatory joints adequately, and the drug utilisation rate is low. Herein, we designed and prepared a brush-like bionic lubricant for joint lubrication and drug loading. The poly(2-methyl-2-oxazoline) branched chain was grafted onto the hyaluronic acid main chain by ring-opening polymerisation and graft polymerisation to form a brush-like bionic lubricin containing multiple hydrophilic groups, which was self-assembled to encapsulate the drug by using its multi-branched special structure for drug loading. The friction behaviour tests on the articular cartilage surface showed that the prepared bionic lubricin has excellent lubrication effect, with a minimum friction coefficient of 0.036 close to the lubrication effect of natural synovial fluid, which is mainly due to the hydrophilic groups on its molecular chain that can adsorb the water molecules and form a hydration layer at the cartilage interface, which plays the role of hydration lubrication. In addition, in vitro drug release studies showed that the synthesised drug-loading biomimetic lubricin had a certain drug release capacity, and the maximum drug release rate could reach 77.8 % at 72 h. The synthesis of this bionic lubricant with dual functions of lubrication and drug release provides a new idea for the treatment of osteoarthritis.
研究领域:
生物材料学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2016
·
IF 3.586
Qinzhuo Zhou,Anqi Wang,Lu Dai,Suyun Jie,Bo-Geng Li
A series of hydroxyl functionalized polybutadienes has been prepared by combining the oxidolysis and reduction of cis -polybutadiene rubber (BR). For the first time, multi-hydroxyl polybutadiene (MHPB) with α,ω- and intrachain hydroxyl groups was synthesized through the simultaneous reduction of –CHO and epoxy groups in epoxidized aldehyde group terminated polybutadiene (EATPB) by sodium dihydro-bis-(2-methoxyethoxy) aluminate (Red-Al). The corresponding hydroxyl functionalized polyethylenes , including hydroxyl-terminated polyethylene (HTPE), multi-hydroxyl polyethylene (MHPE) and hydroxyl-terminated polyethylene with ethyl branches (FHTPE), were readily obtained via the hydrogenation of C=C double bonds in the functionalized polybutadienes with TSH/TPA regents. The microstructures of all the products were confirmed by 1 H NMR, 13 C NMR and FT-IR, and their thermal properties were determined by TGA and DSC . It has been indicated that the linear HTPE and MHPE possessed high initial thermal degradation temperature, high degree of crystallinity , and high melting temperature due to their stereoregular microstructure. However, the FHTPE obtained through the hydrogenation of HTPB from free radical polymerization had much lower degree of crystallinity and melting temperature due to the presence of more ethyl branches.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1857-1872
·
IF 5.044
Zhang Chao,Jiang Zhiming,Zhu Shaotong,Zhu Ping
Abstract A kind of multi-hydroxyl containing hyperbranched phosphoramidate (HPAE) was successfully synthesized and characterized by FT-IR, 1 H-NMR, 31 P-NMR, and GPC. With the crosslinking of butane tetracarboxylic acid (BTCA), the flame-retardant cotton fabrics were prepared, and the combustion behavior and thermal degradation properties were investigated by limiting oxygen index (LOI), vertical flammability test, cone calorimetry test and thermogravimetric analysis. After treating with 300 g/L HPAE, good flame retardancy was obtained with LOI value of 29.0% and treated cotton fabrics can pass the vertical flammability test without afterflame and afterglow. The peak heat release rate was decreased from 255 to 93 kW/m 2 and the total heat release after treatment was reduced by 37%. The thermal stability was greatly improved and over 40% of char residues maintained at 800 °C in N 2 . The washing durability of HPAE-BTCA treated cotton fabrics was also investigated and LOI value decreased from 29.0 to 25.2% after 25 washing cycles. Besides, the tensile strength, wrinkle recovery angle, and whiteness of cotton fabric after treatment were examined. Overall, our research provides a facile and effective approach to prepare durable flame-retardant cotton fabric, which has great potential in friendly flame-retardant textiles. Graphic abstract
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.799
Yaxun Sun,Xin Li,Tingting Wang,Yaxiong Ji,Yihang Yue,Yong Li,Shifeng Wang
In this study, a multi-hydroxyl-containing gemini surfactant 1,4-bis(hexadecyldimethylammonio)-2,3-dihydroxylbutane dibromide (BHHB) is firstly introduced to modify vermiculite (Na-Vt) for 2-naphthol adsorption. Successful functionalization is verified from the enhanced hydrophobicity, increased organic carbon content, enlarged interlayer spacing and decreased surface area of BHHB-Vt over Na-Vt, constructing favorable structural microenvironments for 2-naphthol retention. Effective adsorptivity and excellent reusability are obtained from the comparison of BHHB-Vt (198.16 mg/g) over Na-Vt (43.26 mg/g C0 = 300 mg/L, V = 30 mL, m = 0.03 g, t = 3 h). Partition process, hydrogen bond, OH-π interaction and electrostatic attraction are responsible for the adsorption, where OH-π interaction is stronger than hydrogen bond. The agreement of pseudo-second order and Langmuir models indicate a chemical adsorption feature on homogeneous surface. Notably, hydrogen groups connected at different carbon atoms exhibit less steric hindrance and wider molecule orbitals, providing stronger interactions between the adsorbent and targeted organic pollutant.
研究领域:
环境科学
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Lili Ma,Hui Liu,Xin Wen,Karolina Szymańska,Ewa Mijowska,Chuncheng Hao,Tao Tang,Qingquan Lei
It is still a great challenge to develop epoxy resin/glass fabric (EP/GF) composites with well-balanced enhancements on flame retardancy and mechanical properties . Herein, a novel strategy that polyhydric SiO 2 coating assistant to graft organophosphorus (DOPO) onto GF was developed for simultaneously improving flame retardancy and mechanical properties of EP composites. The grafting amount of DOPO could reach to 43.64 wt% via the helpful bridging of polyhydric SiO 2 , so that EP composites displayed excellent flame retardancy with the LOI of 37.2%, the V0 rating on UL-94 and a 63.3% decrease on PHRR in cone calorimeter test. According to the analysis of char morphology and structure, the flame retarded mechanism was mainly ascribed to the enhanced barrier effect of a continuous and intergrow char layer, which was composed of GF@SiO 2 as framework and P-containing condensed carbon as stuffing. Meanwhile, EP composites exhibited outstanding mechanical performances with 35% and 60% increases on tensile strength and impact strength respectively, which resulted from the special molecular structure of GF@SiO 2 - g -DOPO with strong interfacial adhesion with EP chains via hydrogen bond and chemical bond. In summary, this work will be favorable to design multifunctional polymer composites with well-balanced comprehensive performances, and expand their widespread applications in high-end fields.
研究领域:
材料科学
·
化学工程
✓ 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）