CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Yafeng Wang,Xian Luo,Wenjie Lu,Bin Huang,Yanqing Yang
Since Pt- and Pd-based catalysts, as the most common anode catalysts, usually suffer from CO poisoning issue during the electro oxidation of ethylene glycol, it is essential to explore more high-efficiency Pt- and Pd-free ethylene glycol oxidation reaction (EGOR) catalysts for better service in direct ethylene glycol fuel cells (DEGFCs). In this work, RhCo alloyed nanodendritic catalysts applied on EGOR in alkaline solution are designed and synthesized by a solvothermal method. The RhCo nanodendrites consist of radially distributed pine tree shaped flakes and rod-like crystals. The mass activity for the as-prepared Rh 3 Co 1 nanodendrites during the EGOR reaches up to 3018.7 mA mg −1 , which is 2.2-folds higher than that of commercial Pt/C. Moreover, the Rh 3 Co 1 nanodendrites exhibit better stability and CO tolerance toward the EGOR than pure Rh nanodendrites and commercial Pt/C. Experimental observations in combination with density functional theory (DFT) calculations reveal that the notably promoted catalytic performances of Rh 3 Co 1 nanodendrites are mainly attributed to the distinct nanodendritic morphology and the synergistic effect of Rh and Co. This work provides a valuable insight for developing efficient electrocatalysts for DEGFCs.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2024
·
IF 2.1
Yu Wei,Yingxia Wu,Xuejin Li,Juan Zhang,Honghong Chang,Wenchao Gao,Fanhui Meng,Peng Yang
This paper report a cost-effective, green, and acceptorless dehydrogenative one-pot synthesis of indole derivatives from ethylene glycol and aniline derivatives using an acidic alumina-supported Pt nanoparticle catalyst (Pt/Al 2 O 3 ) with 3 wt% Pt loading. The indole yield could reach more than 50 %, which was further expanded to synthesize eight indole derivatives including 5-methoxyindole. Catalyst characterisation showed that Pt/Al 2 O 3 was weakly acidic catalyst, the Pt particles were highly dispersed in nano-size on the surface of the Al 2 O 3 . The mechanistic studies shows that the indoles proceeded via successive dehydrogenation, condensation and dehydration steps with high showed atomic efficiency, with N -(2-Hydroxyethyl) aniline as the key intermediate, and N,N' -diphenylethylenediamine and 1,4-diphenylpiperazine as the main by-products.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2025
·
IF 3.7
Jia Cheng,Yang Xiang,Xun Huang,Zidong Wei
Electrocatalytic oxidation of surplus ethylene glycol (EG) to high-value glycolic acid (GA) represents a promising approach for sustainable resource utilization, though critical challenges persist in developing durable electrocatalysts and achieving effective recovery of the free acid product from its salt derivatives in alkaline electrolytes. In this work, a PdNi/NF catalyst was rationally synthesized via a one-step electrodeposition method. Systematic characterization revealed that the electron transfer from Ni to Pd modulates *OH adsorption to accelerate EG oxidation reaction (EGOR) while preventing Pd deactivation through oxidation. The optimized system demonstrated exceptional alkaline performance with a glycolic acid Faraday efficiency of 95% and a current density of 666 mA cm -2 . When implemented in an asymmetric EGOR||HER flow cell configuration where only the cathodic electrolyte contains alkaline, the system demonstrated exceptional operational stability by sustaining 70 mA cm -2 current density at a low cell voltage of 0.9 V in neutral media for over 100 h, with product glycolic acid requiring no further acidification. This investigation provides a practical framework for designing efficient electrocatalytic systems that simplifies product separation steps.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Wei Liu,Bo Wang,Haifeng Dong,Mengyu Ren,Zongxu Wang,Dan Li,Yi Nie,Xiangping Zhang
Efficient CO₂/CH₄ separation is crucial for the value-added utilization of natural gas, shale gas, and biomethane. This work developed a series of tetramethylammonium-based ionic liquids (ILs) containing ethylene glycol (EG) as high-performance absorbents. Among them, the [N₁₁₁₁][1,2,4-Tz]/EG (1:1) system exhibited a high CO₂ capacity of 0.205 g/g at 40 °C and 100 kPa, together with exceptional CO₂/CH₄ selectivity (574). The separation performance was finely tuned by varying the EG content, which regulated the hydrogen-bond network within the hybrid system, leading to a remarkably low regeneration energy of 1.13 GJ·t −1 CO₂, superior to conventional ILs and amine solvents. Mechanistic studies unveiled that the hydrogen bonds between EG and IL anions not only promoted CO₂ activation but also directed the reaction pathway toward the formation of thermodynamically stable carbonate species (RCO₃ − ) rather than carbamates, thus facilitating the low-energy regeneration process. This study demonstrates that hydrogen bond modulation in EG-IL systems provides a sustainable and efficient strategy for CO₂ capture.
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ChemistrySelect
·
2025
·Vol. 10
·期 46
·e04751
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IF 2
Zhiyan Ma,Like Dou,Hai Liang,Weifang Han
Phase change materials (PCMs) typically exhibit low thermal conductivity (TC) and limited light absorption, which restrict their application in solar thermal utilization. In this study, boron nitride microrod-supported copper (Cu@BNR) was developed as a multifunctional filler and incorporated into polyethene glycol (PEG) to fabricate PEG-based composite PCMs. The incorporation of Cu promotes the formation of a continuous thermal network and enhances photothermal conversion capability. Due to this unique structure, the PEG/Cu@BNRs composite containing 10 wt% Cu@BNRs achieves a TC of 1.344 W·m −1 K −1 , representing 5.1-fold and 2.2-fold increase compared to pure PEG and PEG/BNRs, respectively. Under simulated sunlight (100 mW cm −2 ), the PEG/Cu@BNRs composite reaches a photothermal conversion efficiency of 91.2% and demonstrates excellent shape stability and cycling reliability. As a thermal interface material in LED systems, the PEG/Cu@BNRs composite significantly reduces operating temperatures, confirming its practical thermal management capabilities. Consequently, the prepared composite PCMs integrate solar energy conversion, efficient heat conduction, and thermal storage functions, making them suitable for sustainable energy applications. Graphical Boron nitride microrod-supported copper (Cu@BNR) was developed as a multifunctional filler and incorporated into polyethene glycol (PEG) to fabricate PEG-based composite PCMs. The PEG/Cu@BNRs composite PCMs exhibit excellent heat transfer performance and high photothermal conversion efficiency.
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Yongfang Zhang,Xiaoxia Yang,Zhenning Lu,Haiping Li,Xiuli Guo,Wanguo Hou
A PEGylated 10-hydroxycamptothecin (HCPT) conjugate, an amphiphilic prodrug, in which two hydrophobic HCPT molecules were conjugated to the two ends of a hydrophilic poly(ethylene glycol) bis(carboxymethyl) ether (PEG-biCOOH) molecule, was synthesized by esterification of the terminal carboxylic groups of PEG-biCOOH and the 10-OH groups of HCPT molecules. The obtained conjugate, denoted as PEG-bi(COO-HCPT), was characterized using NMR, MALDI-TOF MS, HPLC, elemental analyses, FT-IR, and UV–Vis spectroscopy. Especially, the surface activity and self-assembly behavior of the amphiphilic conjugate in water were examined using equilibrium surface tension and fluorescence techniques. The prodrug exhibits a high drug content of ∼52.7 wt% and the significantly enhanced water-solubility of HCPT from ∼1.41 μmol/L to ∼2.04 mmol/L. The PEG-bi(COO-HCPT) in water can self-assemble into vesicles with ∼130 nm in size at a concentration higher than ∼23 μmol/L, as evidenced using negative-staining, freeze-fracture, and cryogenic TEM, AFM, conductivity, fluorescence, and dynamic light scattering techniques. Furthermore, the cytotoxicity of the prodrug was evaluated against A549 non-small cell lung cancer (NSCLC) cells (Sensitive cells), human hepatoma (HepG2) cells (Non-sensitive cells), human umbilical vein endothelial cells (HUVEC, Normal cells), showing excellently improved cytotoxicity in comparison with pristine HCPT. This work provides a better understanding of self-assembly behavior of amphiphilic prodrugs in solutions and demonstrates that PEGylation of HCPT might be one of the promising strategies to improve its therapeutic efficacy.
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INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2019
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IF 1.426
Yan Zhang,Qihang Zhou,Yujian Liu
Polymethylene-b-poly(ethylene glycol) (PM-b-PEG) with different block length ratio was synthesized by a combination of polyhomologation and coupling reaction. The effect of hydrophilic and hydrophobic block length on the crystallization process and self-assembly behavior of PM-b-PEG was self-assembled were investigated. The results showed that with the increase of methylene units, the crystallization temperature of PM block raised from 54.59 °C to 70.93 °C gradually, while that of the PEG block reduced from 17.54 °C to 15.23 °C. In addition, the amphiphilic PM-b-PEG was self-assembled into star-like micelles in water, and its diameter extended from 98.2 nm to 151.9 nm as the block length of hydrophobic PM increased from 30 to 70. And the micelles also exhibit super stability when the concentration of copolymer precursor is 0.50 ∼ 0.90 mg/ml and the storage temperature lies in the range of 25 ∼ 60 °C.
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Desalination and Water Treatment
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2024
·
IF 1
Jia-Ying Yang,Bao-Yu Yue,Jie Teng,Xia Xu,Xiao-Ru Zhao,Xin-Yu Jiang,Jin-Gang Yu,Fang-Liang Zhou
ABSTRACT To investigate the effects of oxygen contents and surface area of the adsorbents on their removal efficiencies, poly(ethylene glycol) (PEG) with various molecular masses (200, 2,000, and 20,000) modified graphene oxide (GO-PEG) composites were fabricated and used for the removal of Pb(II) from aqueous solutions. The morphologies, specific surface area, and surface functional groups of the GO-PEG composites were characterized by field-emission scanning electron microscopy, Brunauer–Emmett– Teller method, thermogravimetric and differential thermogravimetric analyses, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Batch experiments were conducted to evaluate the effects of contact time, initial concentration, adsorbent dosage, and temperature on the adsorption efficiencies of the adsorbents. The experimental data indicated that the adsorption of Pb(II) onto GO-PEG composites fitted well to the pseudo-second-order kinetic model and the Langmuir isotherm model. Thermodynamic studies indicated that the adsorption was a spontaneous and endothermic process. The obtained GO-PEG (200), GO-PEG (2000), and GO-PEG (20000) composites exhibited the maximum adsorption capacities of 204.50, 72.73, and 196.46 mg g –1 toward Pb(II), respectively. The higher adsorption capability of GO-PEG (200) toward Pb(II) could be attributed to its relatively higher oxygen content and larger SSA. The adsorption capacities of GO-PEG (200) toward other metal ions including Cu(II), Cd(II), Mn(II), Er(III), and Y(III) were 48.04, 80.48, 36.1, 23.1, and 12.2 mg g –1 , respectively.
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Materials Research Express
·
2020
·Vol. 7
·期 9
·095503
·
IF 1.929
Xianxian Lin,Shifang Jia,Jingyi Liu,Wenbin Wang,Huimin Cao,Xi Guo,Weisheng Sun
Thermal energy storage wood (TESW) was fabricated by using graphene aerogel encapsulated polyethylene glycol (PEG) as phase change material and wood as the matrix. The microstructure of TESW was investigated by scanning electron microscope (SEM), the thermal properties of TESW was determined by differential scanning calorimetry (DSC), thermal gravimetric analysis (TG) and laser flash diffusivity apparatus (LFA). The results showed that: (1) graphene aerogel (GA) encapsulated PEG composite was founded in the lumens of wood, there was no apparent interface between PEG and graphene aerogel; (2) the melting and freezing enthalpy of TESW were 11.81 and 27.91 J g−1, respectively. The melting and freezing point were 20 °C and 15 °C, respectively, which were suitable for human comfortable temperature; (3) incorporation of graphene aerogel improved the thermal conductivity of TESW apparently. Thermal conductivity of TESW was 0.374 W (m*K)−1, which increased about 274% compared to pure wood; (4) TG and hygroscopicity test indicated that the TESW had excellent thermal and dimensional stability. The TESW was suggested as energy conservation building material for indoor temperature regulating due to its comfortable phase change temperature and prior latent heat.
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ORGANIC ELECTRONICS
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2020
·
IF 3.31
Shaowei Wang,Hongyuan Li,Bowen Zhang,Zu-an Guo,Hari Bala,Shujuan Yao,Jingyi Zhang,Can Chen,Wuyou Fu,Jianliang Cao,Guang Sun,Zhanying Zhang
The quality of the photoactive layer gravely affects the characteristics and stabilities of photovoltaic device . Here, by introducing polyethylene glycol (PEG) into the methylammonium lead trihalide (MAPbI 3 ) precursor solution, we fabricate high-quality MAPbI 3 perovskite film with high coverage and large grain size . By adjusting the PEG concentration into the perovskite film, the hole-conductor-free mesoporous perovskite solar cell with carbon electrode exhibits a boosted power conversion efficiency of 11.62%, which originates primarily from the enhancements of light absorption and acceleration of carriers transfer. Meanwhile, hygroscopic PEG protects the perovskite film from moisture, which leads to the perovskite film and corresponding device exhibit superior stability. This work confirms a high-efficiency and feasible strategy using polymer materials to enhance the performance in power conversion efficiency and stability of perovskite solar cells.
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Desalination and Water Treatment
·
2024
·
IF 1
Huchuan Wang,Jianjun Yang,Chenchen Fang,Chuanrun Li,Guochen Zhong,Chengjun Peng
A new scale inhibitor maleic anhydride-modified sodium carboxymethyl cellulose(CMCMA), acrylic acid (AA) and polyethylene glycol ester (PEGMA maleic anhydride-modified polyethylene glycol) were synthesized by aqueous solution free radical and evaluated as scale inhibitor against the growth of calcium carbonate(CaCO 3 ) scale through the static test experiments. When the reaction ratio is m(CMCMA):m(PEGMA):m(AA) = 1:3:5, the reaction condition is 80°C, the ratio of the initiator (ammonium persulfate) is 6%, the test temperature is 70°C, and the heat retention time is 8 h can get optimal scale inhibition results. The resistance rate of CaCO 3 scales up to 89%. The copolymer structure and CaCO 3 scale crystal were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance ( 1 H-NMR) and scanning electron microscope. The performance of CaCO 3 scale crystallization and morphology data was found to be suitable for the conditions found in the cooling water system.
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Energy Storage Materials
·
2021
·
IF 17.789
Jiawei Wang,Yuan Huang,Binbin Liu,Zixuan Li,Jiyan Zhang,Guoshen Yang,Pritesh Hiralal,Shunyu Jin,Hang Zhou
Natural polymer hydrogels are promising candidates for solid-state electrolytes in zinc-ion batteries. They are safe, biocompatible, and mechanically robust. However, the ionic conductivity of most natural polymer-based hydrogels is unsatisfactory, and they are particularly problematic at sub-zero temperatures because freezing severely limits their functionality. In this study, we fabricate composite hydrogels with high ionic conductivity (25.37 mS cm −1 ). This is done by blending two kinds of natural polymers, guar gum (GG) and sodium alginate (SA). The zinc-ion batteries with GG/SA hydrogel electrolytes show a superior electrochemical performance (354.9 mAh g −1 at 0.15 A g −1 , 137.0 mAh g −1 at 6 A g −1 and capacity retention of 91.52% over 1000 cycles) than the zinc-ion batteries with the pure GG hydrogel electrolyte. In addition, to extend the application range of GG/SA hydrogels into the sub-zero temperature region, we introduce ethylene glycol (EG) into GG/SA to form GG/SA/EG anti-freeze hydrogel. Below -20 °C, the GG/SA/EG hydrogel maintains a high ionic-conductivity (6.19 mS cm −1 ), and the zinc-ion batteries, which were made of GG/SA/EG hydrogel electrolyte, showed an excellent low-temperature discharge performance, for a specific capacity of 181.5 mAh g −1 at 0.1 A g −1 . This study describes a new approach for the development of natural polymer-based hydrogel electrolytes with high ionic-conductivity and good anti-freeze capability.
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