JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Lixian Xu,Hao Jia,Dongao Zhu,Fengkang Huan,Ruihong Liu,Wei Jiang,Wenshuai Zhu,Huaming Li
Deep eutectic solvents, as the novel and green solvents, are widely applied in various fields because of its unique and excellent quality, such as simple synthesis, non-toxic, biodegradable, wide range of liquids and strong solvation ability. In this work, a series of ternary deep eutectic solvents were synthesized using ZnCl 2 , boric acid (BA) and polyethylene glycol (PEG) with appropriate molar ratios by hydrogen bonds. Compared with binary DESs, ZnCl 2 /2BA/2PEG showed a better desulfurization performance, and 98.7 % sulfur removal was achieved. The hydrogen bonding interaction is considered as the key factor to the formation of DES and to promote the desulfurization reaction. In addition, BA and ZnCl 2 play a synergistic and positive role in the desulfurization system. The DES was immiscible with fuel and could be reused for six cycles without a significant reduction in activity. The possible mechanism of the positive effect of hydrogen bonding interaction and O 2 •− free radicals was proposed. This work offers more possibility for designing new types of DESs for deep desulfurization of fuel oils and other applications in relation to extraction or catalysis.
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BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Rongxin Ling,Weiqi Wei,Yongcan Jin
In this work, HCl catalyzed ethylene glycol–water pretreatment (HCl/EG-H 2 O) of sugarcane bagasse (SCB) was explored with response surface methodology (RSM) and single factor analysis, which aim to investigate the influence of pretreatment variable on pretreated solid cellulose enzymatic conversion. The result showed that HCl/EG-H 2 O pretreatment could selectively extract ∼89.9 % xylan and ∼61.2 % lignin in SCB, meanwhile maintain a relatively high cellulose retention (∼86.8 %). Pretreatment of SCB at 120 °C for 60 min with 1.00 % HCl and 90 % EG obtained the pretreated solid having maximum cellulose enzymatic conversion of 88.7 % under 10 FPU/g enzyme dosage, this enhancement of cellulose enzymatic conversion mainly attributed to structure change of SCB in pretreatment. The adding of enzymatic additives into the hydrolysis process could not only improve hydrolysis efficiency but also lower the enzyme dosage. Besides, the linear relationship between substrate characteristic parameters (such cellulose content, lignin removal rate etc.) and cellulose conversion were observed.
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THIN SOLID FILMS
·
2023
·
IF 2.1
Xinkuai He,Ruqing Guo,Qingtian Zou,Jingjing Yang,Zhousi Hu,Luye Wu
The co-deposition behavior of Co +2 and Fe +2 in ethylene glycol (EG) are investigated using cyclic voltammetry (CV) techniques. These results imply that Co +2 species can accelerate the Co-Fe co-deposition, while Fe +2 can inhibit the reduction of Co +2 . Moreover, the two effects can be improved as Co +2 or Fe +2 concentration increases. Microstructural and compositional characteristics of the samples show that Co-Fe deposits with various Fe content can be obtained from anhydrous FeCl 2 and CoCl 2 in EG. Scanning electron microscopy imaging of the surfaces of these Co-Fe alloy coatings shows that they present a dense structure with spherical “nodules”, the size of which is related to the Fe content. The electrocatalytic activity for hydrogen evolution reaction (HER) on the Co-Fe coatings is also investigated. These results indicate that its electrocatalytic activity can be improved as Fe contents increase from 2.2 to 9.8 wt.% and the Co-Fe alloy with 9.8 wt.% Fe exhibits the high electrocatalytic activity for HER with an overpotential of 124 mV at 10 mA cm −2 in 1 M KOH.
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JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Yuting Wang,Xiaoyu Wang,Liming Chai,Enna Wang,Xionghui Wei,Zhaojun Wu,Jianbin Zhang
Density ( ρ ) and viscosity ( η ) data of polyethylene glycol 300 (PEG300) + N-methyldiethanolamine (MDEA) binary system at T = (298.15–318.15) K with a step of 5 K were measured at P = 1005 hPa. After that, the experimental ρ and η values were correlated and predicted by several semi-empirical models. Meanwhile, the Jouyban-Acree model presented a better fitting for the density, and the McAllister four-body equation presented a better fitting for the kinematic viscosity. Based on the ρ and η values, excess molar volume ( V m E ), partial molar volume ( V 1 ¯ and V 2 ¯ ), viscosity deviation ( Δη ), and excess Gibbs energy of activation of viscous flow ( Δ G ∗ E ) of PEG300 (1) + MDEA (2) binary system were systematically calculated and analyzed. These excess properties showed the predominance of intermolecular self-conjugation in PEG300 (1) + MDEA (2) binary system, and it was further demonstrated by various spectral characterizations. Importantly, the PEG300 + MDEA aqueous system was used for 5 CO 2 absorption (room temperature)-desorption (371.15 K) cycles at a CO 2 flow rate of 200 mL/min, with the average CO 2 capture performance of 0.65 mol CO 2 /mol MDEA of per cycle, demonstrating excellent absorption capability, and remained stable throughout the entire cycle.
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Journal of the Mechanical Behavior of Biomedical Materials
·
2021
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IF 3.902
Feng Hu,Hailin Lu,Zishuo Ye,Shoujing Zhang,Wenbo Wang,Li Gao
New fabrication methods and lubrication materials must be developed to improve the lubrication performance of artificial joints and increase the lubrication duration. Herein, a novel polyvinyl alcohol/polyethylene glycol/graphene oxide (PVA/PEG/GO) hydrogel was prepared by a physical cross-linking method, and then the hydrogel and its sustained-release solution were used as lubricant for friction evaluation. The results demonstrated that the slow-release gel solution has good lubrication performance, and coefficient of friction (COF) is only 0.04, which is much lower than the COF of distilled water (about 0.08) under the same conditions. The structure characterization results revealed that no new materials are formed in the gel. The results of thermogravimetric analyses and differential scanning calorimetry demonstrated that the addition of GO may improve the network crosslinking structure of the PVA/PEG hydrogel and improve its mechanical strength . In addition, PVA/PEG/GO hydrogel has superior self-healing function. The self-healing hydrogel did not break again after being pulled under 200 G of weights. The PVA/PEG/GO hydrogel with excellent slow-release lubricating performance and self-healing properties provides a novel candidate for design of long-term lubricating artificial joints, and is expected to promote the progress of artificial joint lubrication applications.
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JOURNAL OF CHROMATOGRAPHY A
·
2021
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IF 4.759
Xinying Zheng,Yang Qin,Xiaobing Meng,Zhengyu Jin,Liuping Fan,Jinpeng Wang
In this work, we for the first time synthesized the polyethylene glycol (PEG) bonded silica gel via KH-560 as a silane coupling reagent for column chromatography by a solid/liquid surface continuous reaction method. The molecular interaction, structure, morphology, and thermostability was characterized by fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), scanning electronic microscope (SEM) and thermogravimetric analysis (TGA). Given that PEG is capable to self-assemble with α-CD, the PEG bonded silica gel was used as packing of column chromatography to achieve the selective separation of α-cyclodextrin (α-CD) at room temperature and atmospheric pressure. The bonded silica gel column could realize the effective separation of α-CD in the enzymatic hydrolysis mixture, which provides support for industrial separation of α-CD.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 46
·20458-20469
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IF 3.288
Jiaqi Chen,Chunhui Xiang,Nana He,Junhao Zhang,Lili Li,Shujun Dong
Chitosan (CS) based nanofibrous membranes were fabricated via hybrid electrospinning of chitosan (CS) and poly(ε-caprolactone) (PCL) or poly(ε-caprolactone)-block-poly(ethylene glycol) (PCL-b-PEG) copolymers for the adsorption of dyes from aqueous solution. The amphiphilic block polymers were obtained by polymerization of PCL and different molecular weights of PEG. It was observed that the secondary fiber and core–shell structure could be controlled by PEG segments. The results of XPS showed that as the molecular weight of the PEG segments increased, the content of CS on the fiber surface increased. The parameters of adsorption time, initial concentration and pH values on the adsorption capacity were studied. The adsorption experiments showed that the adsorption process toward Congo red (CR) on CS-based membranes fitted well with the pseudo-second-order model and Langmuir isotherm model. The CS-based membranes with PEG molecular weight of 5 kDa possessed good reusability and the maximum adsorption capacity calculated from the Langmuir model was 291.55 mg g−1. The existence of intermolecular hydrogen bonds between CS and PCL-b-PEG copolymer reduced the loss of CS. Therefore, CS-based membranes would be promising materials for water remediation.
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ELECTROCHIMICA ACTA
·
2020
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IF 6.215
M.W. Guo,C.B. Sun,W.Q. Yang,L. Chen,H. Lei,Q.B. Zhang
Deep eutectic solvents with the advantages of being less expensive, non-toxic, renewable, and biodegradable are emerging as versatile solvent systems for the electrochemical synthesis of advanced functional materials. Herein, we study the electrochemical deposition of Mn nanoflake arrays grown on Cu foam and the morphology evolution of Mn crystals in the early stages of nucleation and growth in a choline chloride/ethylene glycol-based deep eutectic solvent (Ethaline-based DES). Thiourea (TU) is an efficient additive that is found to promote the electrochemical reduction of Mn(II) species in Ethaline-based DES and induce the formation of Mn nanoflake architectures with a nanoporous configuration. Investigation of the nucleation and growth processes with chronoamperometric transients reveals that the presence of TU can accelerate the generation of homogeneous Mn nuclei and dramatically enhanced the nucleation rate by modifying the corresponding nucleation and growth model from 3D progressive to 3D instantaneous. TU is found to play an important role in the crystallization kinetics of Mn crystals and manipulate the shapes, sizes, and growth morphologies of the formed Mn films. Our work highlights the importance of additives for controlling the microtopography of nanostructured Mn in Ethaline-based DES for potential electrochemical applications.
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CHEMOSPHERE
·
2020
·
IF 5.778
Cong Ma,Jian Hu,Wenjing Sun,Zhigang Ma,Weiqin Yang,Liang Wang,Zhilin Ran,Bin Zhao,Zhaohui Zhang,Hongwei Zhang
The novel highly hydrophilic composite additive, graphene oxide-polyethylene glycol (GO-PEG, further abbreviated as P-GO), was synthesized from GO and PEG by the esterification reaction. Then, P-GO was blended into a polyvinylidene fluoride (PVDF) casting solution as an additive, and the effects of P-GO on the performance of the PVDF ultrafiltration (UF) membrane were researched. When amount of added P-GO was 0.5 wt%, the flux of the resultant modified membrane (denoted as P/0.5P-GO) reached as high as 93 L m −2 ·h −1 , that is twice than that of the pure PVDF membrane (45 L m −2 ·h −1 ). Furthermore, water contact angle results confirmed significantly improved hydrophilicity of the P/0.5P-GO membrane. Results of antifouling tests revealed that the P/0.5P-GO membrane showed the lowest total resistance and irreversible resistance among all the membranes prepared in this study, and after physical cleaning, its flux recovery ratio was the highest—78%. These results demonstrated improved antifouling performance of the P/0.5P-GO membrane. Therefore, it can be concluded that P-GO as an additive material for the PVDF membrane has satisfactory performance in improving the membrane hydrophilicity, permeability, and antifouling performance in practical applications.
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FUEL
·
2021
·
IF 6.609
Xin Yu,Lincai Peng,Jun Dai,Hui Li,Chaonan Tao,Fa Yang,Junhua Zhang
Conversion of carbohydrates at concentrated feeds represents highly desirable for the industrial deployment of biobased fuels and chemicals but challenging. One key bottleneck is that the excessive formation of polymeric humins greatly diminishes the utilization rate of feedstocks and the destination product yield. We report that the use of ethylene glycol as co-solvent for acid-catalyzed conversion of concentrated sugars enhances desirable alkyl levulinate (AL) production compared to reactions carried out in single monohydric alcohols (e.g., methanol, ethanol). Ethylene glycol served not only as a solubilizer of sugars in the reaction medium to lessen their tendency to polymerize by protecting reactive hydroxyl groups in sugars with alcohols, but also as a supporter to restrain the condensation of furan intermediates. With 10 vol% ethylene glycol as the co-solvent of ethanol, an improved yield of ethyl levulinate (EL) from 45% to 56% was accomplished from concentrated feeds of glucose (200 g/L). In particular, high space time yield and EL concentration respectively up to 30 kg/m 3 ·h and 90 g/L were obtained in a batch reactor. The solvents and catalyst could be isolated from the products, and showed good reusability. This contribution opens a reliable avenue for converting highly concentrated feeds of biomass-related sugars to oxygenated liquid fuels and versatile chemicals.
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SEPARATION SCIENCE AND TECHNOLOGY
·
2021
·
IF 2.475
Chunyao Zheng,Ke Li,Chao Zhang,Dongshun Deng
Weak basic guanidinium acetylacetonate ([TMG][acac]) was synthesized and blended with PEG200 to construct hybrid absorbent for SO2. The composition was optimized on the basis of viscosity and SO2 absorption performance. For the preferred 20% [TMG][acac]-PEG200 mixture, the effect of various parameters were systematically investigated. Results showed that the maximum mass ratio of SO2 to [TMG][acac] was 0.838 and 0.331 at 30°C for pure and 10% SO2, respectively. The mixture was easily recycled five times. The present SO2 capture process using [TMG][acac]-PEG200 mixtures was a promising method for SO2 removal with both good reversibility and high absorption capacity.
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JOURNAL OF BIOMATERIALS APPLICATIONS
·
2021
·
IF 2.646
Xiang Zhang,Zhenhao Yan,Guotao Guan,Zijing Lu,Shujie Yan,Azhen Du,Lixia Wang,Qian Li
Natural cartilage tissue has excellent mechanical properties and has certain cellular components. At this stage, it is a great challenge to produce cartilage scaffolds with excellent mechanical properties, biocompatibility, and biodegradability. Hydrogels are commonly used in tissue engineering because of their excellent biocompatibility; however, the mechanical properties of commonly used hydrogels are difficult to meet the requirements of making cartilage scaffolds. The mechanical properties of high concentration polyethylene glycol diacrylate (PEGDA) hydrogel are similar to those of natural cartilage, but its biocompatibility is poor. Low concentration hydrogel has better biocompatibility, but its mechanical properties are poor. In this study, two different hydrogels were combined to produce cartilage scaffolds with good mechanical properties and strong biocompatibility. First, the PEGDA grid scaffold was printed with light curing 3D printing technology, and then the low concentration GelMA/Alginate hydrogel with chondral cells was filled into the PEGDA grid scaffold. After a series of cell experiments, the filling hydrogel with the best biocompatibility was screened out, and finally the filled hydrogel with cells and excellent biocompatibility was obtained. Cartilage tissue engineering scaffolds with certain mechanical properties were found to have a tendency of cartilage formation in in vitro culture. Compared with the scaffold obtained by using a single hydrogel, this molding method can produce a tissue engineering scaffold with excellent mechanical properties on the premise of ensuring biocompatibility, which has a certain potential application value in the field of cartilage tissue engineering.
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