RSC Advances
·
2017
·Vol. 7
·期 14
·8567-8574
·
IF 3.108
Jiachun Chai,Shanhui Zhu,Youliang Cen,Jing Guo,Jianguo Wang,Weibin Fan
One-pot hydrogenolysis of cellulose to ethylene glycol (EG) was carried out on WO3-based catalysts combined with Ru/C. To probe the active catalytic site for breaking the C–C bond of cellulose, a series of WO3–ZrO2 (WZr) catalysts were synthesized and systematically characterized with XRD, Raman, UV-Vis, H2-TPR, DRIFS and XPS techniques and N2 physisorption experiment. It was found that the WO3 crystallites became more easily reduced to W5+–OH species with increasing crystallite size or tungsten surface density of the WZr catalyst owing to the decrease of their absorption edge energy (AEE) originating from weakening their interaction with ZrO2 support. This, as a result, gave higher EG yield at higher tungsten surface density. The structure–activity relationship of the WZr catalyst reveals that the active catalytic site for cleaving the C2–C3 bond of the glucose molecule is the W5+–OH species.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2016
·Vol. 301
·期 11
·1374-1382
·
IF 2.834
Ke Wen Li,Lian Cen,Chao Zhou,Ao Kai Zhang,Fang Yao,Lin Hua Tan,Li Qun Xu,Guo Dong Fu
Poly(ethylene glycol) (PEG)-based hydrogels have attracted increasing attention in recent years due to their good biocompatibility and low cost. However, the PEG-based hydrogels prepared by traditional methods exhibit a poor machinability due to their disordered network structure. Herein, the preparation of well-defined PEG-based hydrogel via a facile thermally induced copper-catalyzed azide–alkyne cycloaddition (CuAAC) reaction is demonstrated. To accomplish this, thermochemically reduced Cu(I) catalyst is adopted to trigger “click” cross-linking, resulting in a well-defined PEG network. The as-synthesized PEG-based hydrogel exhibits good mechanical performance with a tensile strength of 2.51 MPa, which is higher than the traditional PEG-based hydrogels prepared from CuSO 4 /NaSac-mediated or CuBr/ligand-catalyzed CuAAC. Moreover, in vitro cytotoxicity and in vivo porcine subcutaneous implantation tests demonstrate that the as-synthesized PEG-based hydrogel has a good biocompatibility and low toxicity, making it a promising candidate for the applications in biomedical devices and tissue engineering.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Mengyao Luo,Longli Bo,Sining Huang,Haiguang Wang,Zhiyun Yang,Danjun Wang,Ying Yang,Zhe Li,Lu Wang
Adding polyethylene glycol (PEG) can lessen the shedding of coating and improve the dispersion of active particles for monolithic catalysts. In this study, a series of Cu-Mn-Ce-O x (P x )/TiO 2 (P x )/CH catalysts were prepared with different PEG molecular weights (P x , x = 200, 1000, and 2000) to explore the effect of P x addition on the structure and activity of the catalysts in microwave catalytic combustion of toluene. The research showed that P x addition (1 wt% dosage to titanium sol) to coating reduced the particle size of titanium sol and decreased the shedding rate of TiO 2 coating 0.9–0.93 %, and P x addition (3 wt% dosage to CH's water absorption) to active components further lessened the shedding rate of the catalysts 1.93–2.04 %. Under an initial toluene concentration of 1500 mg/m 3 and a gas hourly space velocity of 2260 h −1 , Cu-Mn-Ce-O x (P 1000 )/TiO 2 (P 1000 )/CH owned the highest catalytic activity and its complete removal temperature (T R100 ) and mineralization temperature (T M100 ) to toluene were 180℃ and 218℃, respectively, which were lower 33℃ and 16℃, 56℃ and 58℃ than Cu-Mn-Ce-O x /TiO 2 (P 1000 )/CH and Cu-Mn-Ce-O x /TiO 2 /CH catalysts separately, and its activity maintained steadily with toluene removal efficiencies of 99–91 % over 12 h. The improved activity is attributed to the uniform dispersion of active particles, larger specific surface area, and increased adsorbed oxygen, facilitated by pore-forming and steric-hindrance effects of P x . Electron transfer among Mn 4+ /Mn 3+ /Mn 2+ , Cu 2+ /Cu + , and Ce 4+ /Ce 3+ promoted the oxidation of toluene under microwave irradiation. Therefore, the research provides technological support for developing transition metals-based catalysts for industrial VOC waste gas treatment.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 2
·020547
·
IF 3.1
Weida Li,Haoyan Gu,Hao Yang,Quanchen Li,Xinran Li,Yaping Wang,Guangchuan Liang
High volumetric energy density LiFePO4/C cathode materials were synthesized by wet ball milling, spray drying, and carbothermal reduction method using glucose and polyethylene glycol (PEG) as composite carbon sources and dodecyl polyglucoside (C12APG) as a milling aid. With the introduction of C12APG during the ball milling process, the prepared cathode materials have uniform particle size (100–200 nm in diameter) and regular primary particle morphology. In addition, PEG substitutes part of glucose as a carbon source, resulting in low carbon content and high graphitization of residual carbon after high-temperature calcination. The prepared LiFePO4/C cathode materials have a high powder compaction density (2.68 g cm−3) and excellent electrochemical performance (discharged capacities of 161.2 and 141.7 mAh g−1 at 0.2 C and 5 C, and cycle retention of 98.6% for 100 cycles at 1 C/1 C). This LiFePO4/C composite was assembled into 14500-type cylindrical batteries with a compaction density of 2.62 g cm−3 for the positive electrode. The volumetric energy densities of the positive electrode were 1135.18 Wh L−1 and 918.16 Wh L−1 at 0.2 C and 5 C, respectively.
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FUEL
·
2017
·
IF 4.601
Zhuqian Xiao,Yu Fan,Yongjie Cheng,Qiang Zhang,Qing Ge,Ruyi Sha,Jianbing Ji,Jianwei Mao
The catalytic transformation of cellulose to polyols is one of the significant strategies to overcome the shortage of fossil fuels. Here we report a simple but effective preparation method for Ni-W/SiO 2 catalysts by introduction of chelating agents (ammonium hydroxide and ethanediamine) coupled with organic reducing agent (ethylene glycol). The ethylene glycol (EG) yield from microcrystalline cellulose could reach up to 63.3% at 240 °C, 5.0 MPa H 2 for 2.0 h over 15%Ni-20%W/SiO 2 -EEG catalyst. Moreover, some key parameters of process conditions including calcining temperature, reaction temperature and time, H 2 pressure and the recycling use of catalysts were investigated. Both theoretical and experimental studies suggested that 15%Ni-20%W/SiO 2 -EEG catalyst showed the best activity and stability for cascading steps for EG formation at this reaction condition. By the detailed analysis of Ni-W/SiO 2 catalysts after calcination via FT-IR, XRD , XPS , thermogravimetry (TG), TEM and element mapping, it could be concluded that on the surface of 15%Ni-20%W/SiO 2 -EEG catalyst, the particles showed less agglomeration and more homogeneous on the surface of SiO 2 . Some Ni x W y alloys (NiW, Ni 2 W 4 C) were also formed. Furthermore, it was found that the introduction of ethanediamine could promote the actual loading of nickel and tungsten species slightly according to the analysis of ICP-OES test.
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JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2018
·
IF 2.382
Jian-gen Xu,Zheng-song Qiu,Xin Zhao,Han-yi Zhong,Gong-rang Li,Wei-an Huang
In order to solve wellbore instability problems in the drilling process, high-performance shale stabilizers in water-based drilling fluids are essential. In this paper, a novel shale stabilizer based on polyethylene glycol grafted nano-silica composite (PEG-NS) was successfully synthesized. Conventional techniques were used to characterize PEG-NS including Flourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), transmission electron microscopy (TEM), particle size distribution (PSD) and thermogravimetric analysis (TGA). The results showed that the structure of PEG-NS was in agreement with the design objective. The particle size of PEG-NS ranged from 110 to 434 nm, and PEG-NS had good thermal stability. Pressure transmission test, pore structure characterization of shale, rolling recovery test were applied to evaluate the comprehensive performance of PEG-NS as a novel shale stabilizer. The experimental data indicated that PEG-NS could effectively retard the pore pressure transmission and reduce the permeability of shale sample. PEG-NS could adsorb onto the shale surface and a dense plugging film could finally coat on it. Moreover, PEG-NS also exhibited better inhibition performance compared with that of potassium chloride (KCl) and polymeric alcohol (JHC) at the same concentration. Hence, PEG-NS could be a good shale stabilizer in water-based drilling fluids for drilling reactive shale formations.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Guangkai Jin,Yuhong Cui,Tiantian Wang,Sha Liu,Shenghua Xue,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
The dispersion stability of nanomaterials in lubricants significantly influences tribological performance, yet their addition as lubricant additives often presents challenges in secondary dispersion. Here, we present a straightforward method for in situ preparation of N,S-codoped CDs (N,S-CDs)-based lubricants using heterocyclic aromatic hydrocarbons containing N/S elements in poly(ethylene glycol) (PEG) base oil by a directional ultrasound strategy. Two types of N,S-CDs were successfully prepared via the directional ultrasound treatment of PEG with benzothiazole (BTA) and benzothiadiazole (BTH) separately. The resultant N,S-CDs have a uniform distribution of N and S elements and maintain good colloidal dispersion stability in PEG even after 9 months of storage. The N,S-CDs can enter the surface gap of the friction pairs and then induce a tribochemical reaction. Benefiting from the synergistic effect of N and S activating elements, a robust and stable protective film consisting of iron sulfides, iron oxides, carbon nitrides, and amorphous carbonaceous compounds is formed, thus endowing N,S-CDs-based lubricants with improved antiwear and friction-reducing performance. Compared with pure PEG, the coefficient of friction (COF) of the N,S-CDs(BTH)-based lubricant decreased to 0.108 from 0.292, accompanied by a 91.2% reduction in wear volume, and the maximum load carrying capacity increased to 450 from 150 N.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Haifeng Jiang,Chen Yang,Jiaxing Song,Peng Cao,Jie Chen,Jiaxin Wang,Wenpeng Hong
The development of low-cost energy storage materials and the high-value utilization of fly ash are two major challenges that need to be addressed in the field of renewable energy. This work proposes an alkaline hydrothermal treatment method suitable for fly ash modification and prepares a porous bamboo leaf-like structured supporting material for encapsulating polyethylene glycol (PEG) phase change components. The results show that the prepared modified fly ash-based thermal storage material has an excellent latent heat performance, reaching 103.9 J/g, which is 2.24 times that encapsulated by ordinary fly ash. Meanwhile, the thermal conductivity of the modified composites is increased by 48.6%. After 100 heat storage/release cycles, the latent heat value of PEG/MFA decreases by only 0.028%. The reason is that the bamboo leaf-like structure of the modified fly ash support material provides a larger specific surface area. At the same time, the interaction between the support material and PEG promotes the effective adsorption and filling of the PEG phase change material. Leakage tests show that the maximum filling amount of PEG in the composite is 65 wt %. Furthermore, the prepared phase change heat storage material shows a good temperature regulation ability in simulated environment applications. This work sheds light on developing effective disposal of solid waste in power plants and its applications in the field of energy storage.
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ChemistrySelect
·
2024
·Vol. 9
·期 11
·e202400114
·
IF 1.9
Jin Liang,Xiaoxin Wang,Dongsheng Yu,XiTao Luo,Xiangfeng Liang,Zhongliang Su,Qinghui Shou
Graphical Self-supported osmotic membranes were prepared by blending PIM-1-mPEG, which was obtained by modifying PIM-1 with polyethylene glycol monomethyl ether (mPEG), and hydrophilic Tröger's base polymer (DMBP-TB). The membranes utilized microporous molecular sieves and the differences in solute-membrane interactions to achieve high pentose/hexose selectivity in aqueous solutions. Monosaccharides are vital building blocks in bioengineering applications; however, their extraction from intricate mixtures is challenging and uses substantial amounts of energy. Polymers of intrinsic microporosity (PIMs) offer an innovative avenue for separating monosaccharides. We modified PIM-1membranes to improve the glucose/xylose separation by incorporating polyethylene glycol monomethyl ether (mPEG). The optimal mPEG (molecular weight: 1000 Da; mass fraction: 2.5 %; solvent: methanol) delivered a xylose separation coefficient of 2.62. With the hybrid membrane of PIM-1-mPEG (50 w.t.%) and hydrophilic Tröger's base polymerer (DMBP-TB, 50 w.t.%), the separation factor for xylose/glucose in an aqueous solution was 2.51 for single-stage running and 11.32 after five-stage running. There are large fractions of micropores for PIM-1-mPEG, and there is difference on solute-membrane interactions for pentose/hexose, which are regarded to be the main driving force for the high pentose/hexose selectivity in methanol. The blending of PIM-1-mPEG and DMBP-TB, integrates the microporosity and hydrophilicity, finally endues the high pentose/hexose selectivity in aqueous solution. These microporous membranes are promising materials for efficiently separating monosaccharides and jnl> small organic molecules while minimizing energy consumption. We established a solid foundation for further exploring microporous membranes for various applications, notably in bioengineering.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Chong Ouyang,Xinyao Quan,Zhanglian Hong,Kehan Wang,Zi Ang Chen,Mingjia Zhi
In this work, polyethylene glycol is adopted as the solvent for the synthesis of ZnIn 2 S4 photocatalyst by the solvothermal method . Compared with the pristine ZnIn 2 S 4 synthesized in H 2 O solvent, those ones prepared in the polyethylene glycol solvent possess several unique features that are beneficial for photocatalytic CO 2 reduction, such as the increased Zinc vacancy level, the enlarged band gap, and the enhanced built-in internal electric field . These features allow for better charge separation efficiency, thereby improving the photocatalytic activity . The optimized ZnIn 2 S 4 can achieve a CO yield rate of 20.14 µmol/g/h at the gas-solid interface, which is 8.36 times that of the pristine ZnIn 2 S 4 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chun-Miao Zhang,Yun-Ze Qiu,Hao Wu,Jing Guan,Shu-Guang Wang,Xue-Fei Sun
Capacitive deionization (CDI) is flourishing as an energy-efficient and cost-effective water desalination method. However, challenges such as electrode degradation and fouling have hindered the practical deployment of CDI technology. To address these challenges, the key point of our strategy is applying a hydrophilic coating composed of polyethylene glycol (PEG)-functionalized nano-TiO 2 /polyvinylidene fluoride (PVDF) to the electrode interface (labeled as APPT electrode). The PEG/PVDF/TiO 2 layer not only mitigates the co-ion depletion, but also imparts the activated carbon (AC) electrode hydrophilicity. As anticipated, the APPT electrode possessed an enhanced desalination capacity of 83.54 μmol g −1 and a low energy consumption of 17.99 Wh m −3 in 10 mM sodium chloride solution compared with the bare AC electrode. Notably, the APPT maintained about 93.19 % of its desalination capacity after 50 consecutive adsorption–desorption cycles in the presence of bovine serum albumin (BSA). During the trial, moreover, no obvious overall performance decline was noted in concentration reduction (Δc), water recovery (WR) and productivity (P) over 50 cycles. This strategy realizes energy-efficient, antifouling and stable brackish water desalination and has great promise for practical applications.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Xiaobin Zhang,Suling Zhang,Ting Lü,Wenfei Huang,Hongting Zhao,Hui Wang,Dong Zhang,Weixuan Yao
Anabolic steroids and β-agonists are commonly prohibited substances found in doping control studies; therefore, the determination of anabolic substances in biological samples is crucial. To analyze the anabolic compounds in urine, an adsorbent, polyethylene glycol (PEG)-grafted magnetic nanoparticle material (Fe 3 O 4 @SiO 2 -PEG), with low toxicity and strong biocompatibility was prepared in this investigation. Compared to those of Fe 3 O 4 and Fe 3 O 4 @SiO 2 , the grafted PEG chains (approximately 5.4 wt.%) on the magnetic nanoparticles improved the extraction efficiencies by factors of 3.9–17.0 and 2.5–2.9, respectively, likely due to the electrostatic attraction and hydrogen bonding. To achieve maximum extraction efficiency, several extraction parameters were optimized, including the kind and volume of desorption solvent, pH, and the extraction and desorption time. The standard curves were linear within the range of 0.5–20 μg/L for methyltestosterone and trenbolone, and 0.02–5 μg/L for clenbuterol. The limits of detection for the three drugs were 0.01–0.12 μg/L. The limits of quantification were 0.02–0.40 μg/L. The levels of precision of the optimized method were assessed based on the respective intra- and inter-day and batch-to-batch relative standard deviations in the ranges of 3.2–5.2 % ( n = 5), 5.9–11.3 % ( n = 4), and 6.7–9.2 % ( n = 3). The Fe 3 O 4 @SiO 2 -PEG nanoparticles could exclude urine matrix interferences (matrix effect of 91.8–98.1 %) and achieve satisfactory recoveries (75.5–116.1 %), affording sensitive and accurate determination of trace anabolic substances in urine.
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