HYDROMETALLURGY
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2023
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IF 4.7
Lianghong Duan,Shenghai Yang,Yongming Chen,Changhong Wang
Ammonia system shows great potential in the treatment of zinc secondary resource, and electrodeposition has been confirmed as a vital process to extract zinc from the ammonia leachate. However, the ammonia system-based zinc electrodeposition is either inefficient or the zinc deposit in of undesired quality. This study proposes a polyethylene glycol 20,000 (PEG20000 polymer of formula H(OCH 2 CH 2 ) n OH)-assisted ammonia system to conduct high-quality and efficient zinc electrodeposition. The practical operation achieved a low electrical energy consumption of 2391 kW h t −1 Zn and a high current efficiency of 99%, with a smooth and compact zinc deposit of fine (30.2 nm) grains. Further investigation of electrodeposition behavior revealed the following: (i) deposition principle, (ii) diffusion property, and (iii) three-dimensional (3D) instantaneous nucleation mode, and provided a useful reference for guiding the process design and conditions of the practical operation. In general, PEG20000-assisted ammonia system turns out to be a technically and economically viable option to electro-deposit zinc, for its high energy competitiveness and high-quality Zn products.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Jianguo Yu,Zehui Yu,Yunling Jia,Ting Ran,Ming Song,Yanshuang Zhang,Qing Wang,Yuning Qu,Lili Wang
Direct alcohol fuel cells' performance is significantly affected by the phase and composition of the catalyst, thereby the development of high-performance alcohol oxidation catalysts is essential. In this study, PVA preparation was used for the first time to create PdCu core-shell nanoflowers with a high electrochemically active surface area and a potent synergistic effect. Notably, the presence of PVA causes Pd and Cu nanoparticles with different reduction rates to form a core-shell structure, and the Pd nanoparticles continue to migrate regularly under the action of PVA, forming a flower-like morphology with a high degree of branching. Cu@Pd 22.3 catalyst exhibited 13 times higher catalytic performance (4353.04 mA mg Pd −1 ) than Pd/C (334.09 mA mg Pd −1 ) in ethylene glycol oxidation reaction. The Cu@Pd 22.3 catalyst also exhibits higher stability than commercial Pd/C in stability tests lasting up to 20,000 s. This core-shell combination and highly branched structural design result in more active sites for fast ion adsorption/desorption,offering an original method to improving the activity and endurance of polyol oxidation.
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Journal of Energy Storage
·
2023
·
IF 9.4
Tingjun Wang,Chaoming Wang,Zheng Huang,Jiahao Liu,Huibin Yin,Peng Zhu
Due to the insulating nature of organic phase change materials , it is impossible to directly trigger latent heat thermal energy storage via an electrical way. In this work, through crosslinking, freeze-drying and pyrolysis , the interconnected carboxymethylcellulose sodium-derived carbon aerogel (abbreviated as CCA) with high porosity, good solar-thermal conversion capability, electrical conductivity , and mechanic strength is firstly fabricated successfully. The organic phase change material of polyethylene glycol (PEG) is then infiltrated into the CCA via vacuum infiltration to obtain the PEG/CCA15 composite phase change materials that melt at 52.1 °C with latent heat of 173.4 J/g. Electro-thermal test results display that PEG/CCA15 composite present low resistance (1.64 Ω), high electrical conductivity (4.201 S/cm) and excellent electro-thermal energy conversion efficiency (55.6 % under applying 1.4 V). Further results also show that PEG/CCA composites exhibit good photo-thermal energy storage and release abilities. Our results indicate that the as-prepared PEG/CCA15 is a potential candidate to be applied in electrical/solar energy utilization.
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MACROMOLECULAR RESEARCH
·
2023
·Vol. 31
·期 3
·233-243
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IF 2.4
Liu Peng,Bai Xiaoyu,Gao Xingtong,Liu Kai,Li Aixiang,Lyu Zijian,Li Qiuhong
In this paper, lutein block polyethylene glycol (lutein-b-PEG) copolymers were synthesized by hydrophilic modification of lutein with carboxylated polyethylene glycol (CT-PEG). The unreacted lutein was loaded into micelles formed by self-assembly of block copolymers to prepare composite nanoparticles. The results of FT-IR, 1 H NMR, gel permeation chromatography (GPC), UV–vis and critical micellar concentration (CMC) showed that the double terminal carboxyl group ratio of CT-PEG reached 50.31%, and lutein-b-PEG was successfully synthesized without destroying the structure of lutein. Compared with lutein, the retention rate of lutein composite nanoparticles increased from 4.32 to 81.3% after 30 days of storage in the dark. In addition, the saturation solubility and bioaccessibility of lutein nanoparticles were increased 35 times and 5.2 times, respectively, due to micellar formation and improved water solubility. These findings indicated that the lutein composite nanoparticles modified with PEG significantly improved the chemical stability, water solubility, and bioaccessibility of lutein.
Graphical abstract
Preparation and properties of lutein block polyethylene glycol copolymer loading with lutein nanoparticles
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2019
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IF 1.911
Hao Yang,Jiemei Zhou,Zhaogen Wang,Xiansong Shi,Yong Wang
Fouling resistance of ultrafiltration (UF) membranes is critical for their long-term usages in terms of stable performance, so convenient approaches to prepare fouling-resistant membranes are always anticipated. Herein, we demonstrate the facile fabrication of antifouling polysulfone- block -poly(ethylene glycol) (PSF- b -PEG, SFEG) composite membranes. SFEG layer was coated onto macroporous supports and cavitated by immerging them in acetone/ n -propanol following the mechanism of selective swelling induced pore generation. Thus-produced SFEG membranes possessed high permeance and excellent mechanical strength. Meanwhile, the structures and separation performances of the SFEG layers can be continuously tuned through simply changing swelling durations. More importantly, the hydrophilic PEG chains were spontaneously enriched onto the pore walls through swelling treatment, endowing intrinsic antifouling property to the SFEG membranes. Bovine serum albumin (BSA)/humic acid (HA) fouling tests proved the prominent fouling resistance of SFEG membranes, and the fouling resistance is expected to be long-standing because of the firm connection between PEG chains and PSF matrix by covalent bonding.
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PHYSICS AND CHEMISTRY OF LIQUIDS
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2019
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IF 1.526
Huihu Shi,Yunyun Fan,Xianshu Qiao,Chang Liu,Shuai Zhang,Zhaojun Wu
The gas-liquid equilibrium (GLE) data were determined for the mixture SO2 + N2 in the binary system of tetraethylene glycol (TeEG) + dimethyl sulfoxide (DMSO) at T = 298.15–313.15 K and p = 123.15 kPa with the SO2 partial pressures of 0.4–150 Pa. From GLE data, Henry’s law constants (HLCs) were obtained. When the SO2 concentration in the gas phase was designed at ySO2 = 500 ppmv, the SO2 solubility in the binary system is located in a minimum of 9.36 mol m−3 in TeEG and a maximum of 80.34 mol m−3 in DMSO. The SO2 absorption process was reversible from the five absorption–desorption cycles, and the solvents could repeat utilisation without obvious loss of absorption capacity and the homologous SO2 desorption efficiency was nearby 98.7%. Furthermore, the spectral consequences illustrated that H-bonding was formed among TeEG, DMSO and SO2.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2018
·
IF 1.911
Shida Li,Wenxiu Wei,Weiping Jia,Lechen Zhao,Hongmei Xu,Feilong Zhou,Li Zhu,Zhimei Song,Sijia Feng,Runliang Feng
A copolymeric micelle formulation of itraconazole (ITR-M) was prepared using linear-dendritic monoallyloxy poly (ethylene glycol)-b-poly (ε-caprolactone) (APEG-PCL) as drug carrier materials. DL and EE values of ITR-M were 5.70 ± 0.12% and 91.30 ± 1.90%, respectively. The micelle formulation enhanced the ITR solubility up to 30.42 μg/mL. In vitro release of ITR from the ITR-M was mainly drug diffusion process followed by the copolymer’s degradation. ITR-M showed similar anti-Candida albicans activity to that of crude ITR although its release of ITR was slow and continuous. The in vivo pharmacokinetic study demonstrated that the ITR-M could improve tissue distribution of ITR. In conclusion, APEG-PCL could be a potential carrier in the development of antifungal drug delivery system.
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PubMed
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 35
·4789-4800
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IF 4.76
Zongke He,Hui Niu,Nan Zheng,Shuhui Liu,Yang Li
A series of elastomeric hydrogels with repeated processability were prepared in this work. These hydrogels were obtained by cross-linking of two common polymers, poly(ethylene-co-propylene) (ethylene-propylene rubber, EPR) and poly(ethylene glycol) (PEG), via dynamic covalent bonds, specifically, through firstly furyl functionalization of EPR at the side groups and maleimide modification of PEG at the chain ends, and followed by the Diels–Alder reaction between furan and maleimide to construct thermoreversible EPR–PEG networks. The composition and microstructure of the network were adjustable in a wide range by facilely tuning the PEG feeding ratios and molecular weights (as the cross-linking agent). In the network the crystalline PEG and the elastic EPR endowed the material with strength and toughness respectively in the dry state, giving a fracture strength of 4–6 MPa and elongation at break of up to 380%; meanwhile, due to the hydrophilicity of PEG, the network could absorb water and form hydrogels, in which the hydrophobic EPR elastomer enhanced the hydrogels effectively. By tailoring the amount and the chain structure of the PEG moiety, the water absorption of the copolymer could reach as high as 356% in 1 hour, and the hydrogel elongation at break could achieve ∼400%, which was comparable to that of pristine cross-linked EPR. The material displayed low cytotoxicity in MC3T3-L1 cells and was biocompatible.
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INDUSTRIAL CROPS AND PRODUCTS
·
2018
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IF 3.849
He Yang,Weiqi Wei,Shubin Wu,Junping Zhuang
During the upgrading into biorefinery factories, the traditional pulp and paper mills urgently need to broaden the applications of pulp to achieve higher economic benefits. The conversion of pulp into high value-added bulk chemicals is considered as a potential approach. The pulp was previously treated by HCl and spray drying to decrease its particle size to 71.4 μm as the catalytic raw material. Mesoporous WO 3 with the specific surface area of 58.6 m 2 /g was then synthesized via KIT-6 silica template and it shown high performance in catalytic conversion of pretreated pulp into ethylene glycol. The feedstock conversion was 100% and the yield of ethylene glycol was 62.7% under the optimum condition. In comparison tests, the pretreated pulp and mesoporous WO 3 both displayed better catalytic performance than untreated pulp and nano-sized WO 3 without porous structure. However, the catalytic performance of mesoporous WO 3 decreased in recycling test and the reasons were analyzed preliminarily. This work demonstrated that the ordered mesoporous WO 3 was a high-performance catalyst and had potential for producing ethylene glycol in good cooperation with acid pretreated pulp.
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Soft Matter
·
2018
·Vol. 14
·期 22
·4495-4504
·
IF 3.709
Afeng Yang,Xia Dong,Jie Liang,Yan Zhang,Wenzhi Yang,Tianjun Liu,Jun Yang,Deling Kong,Feng Lv
The real-time tracking and adjustment of the disassembly and status of hydrogels in vivo are important challenges to accurate and precise assessment. In this article, a photothermally controllable, visible, dual fluorescent thermosensitive hydrogel was designed and developed based on a porphyrin–poly(ethylene glycol)/IR-820–α-cyclodextrin hydrogel. Due to the photothermal effect and fluorescence emission of IR-820, it can exert the dual functions of photothermal control and fluorescence imaging tracking. The IR-820 conjugated hydrogel can regulate the hydrogel disassembly by the photothermal effect of IR-820. Furthermore, each component of the hydrogel can be tracked by the fluorescence of IR-820 and porphyrin. Fluorescence imaging tracking and remote photothermal control were merged into the visible and controlled hydrogel disassembly after subcutaneous injection using mice as models. The dual fluorescence imaging visualization of cyclodextrin/poly(ethylene glycol) hydrogels revealed the disassembly process by tracking each component, and the hydrogel disassembly can be efficiently accelerated under laser irradiation with the photothermal effect of IR-820. This affords an important basis for understanding the disassembly process of the poly(ethylene glycol)/α-cyclodextrin hydrogel.
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BIORESOURCE TECHNOLOGY
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2012
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IF 4.98
Long Lin,Shang-Ru Zhai,Zuo-Yi Xiao,Na Liu,Yu Song,Bin Zhai,Qing-Da An
A simple method to the preparation of SiO 2 microspheres from rice husks (RH) was developed. The rice husks were extracted with 2 M NaOH solution to obtain a extract contained silica and lignin, and silica spheres were obtained after addition of distilled water, ethanol, 1 M H 2 SO 4 and PEG (W silica :W PEG = 2:1) to the extract in a controllable sol–gel process and calcination at 550 °C. The optimum synthesis conditions were, adjustment of the extract to pH 3, a volume ratio of 1:1:2 of ethanol, water, and extract, respectively and a silica to polyethylene glycol weight ratio of 2:1. The SiO 2 microspheres produced under these conditions exhibited a relatively uniform particle size distribution around 500 nm as determined by LPSA, which indicated a cooperative function of added PEG and extracted lignin towards the formation of SiO 2 microspheres.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Dongsheng Zhao,Shuili Yu,Guicai Liu,Qingbin Yuan,Haicheng Guo
We report a facile approach to prepare antifouling nanofiltration (NF) membrane to treat electrodialysis (ED) concentrate which contained anionic polyacrylamide (APAM). The NF membrane was fabricated through trimesoyl chloride (TMC) reacting with the hydrophilic poly(ethylene glycol) (PEG) derivative (i.e. Jeffamine) in piperazine (PIP) aqueous solution by means of interfacial polymerization (IP). The membrane surface characterization, performance of permeation flux and antifouling property were throughly investigated in this paper. The presence of Jeffamine in the polyamide matrix was verified by the Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The salts and APAM rejection was raised up and the permeation flux decline was slowed down for the ED concentrate treatment, which indicated that the antifouling performance was improved through adding Jeffamine. The optimized Jeffamine addition amount was 15 wt% (in the piperazine solution) at which the largest pure water flux enhancement and the best antifouling performance were achieved. In addition, scanning electron microscopy (SEM) and atomic force microscopy (AFM) of the polypiperazine-amide NF membrane exhibited that the surface smoothness was improved. Accordingly, it could be concluded that the addition of Jeffamine improved the NF membrane hydrophilicity and surface smoothness which could lead to the permeation flux enhancement and the antifouling property improvement.
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