ENERGY & FUELS
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2023
·
IF 5.3
Cunshi Wang,Qiuzi Zhu,Zhimin Gao,Jianzhong Zhu,Liang Chen,Jianlong Liu,Wangjun Bai
The chemical absorption of CO2 using amine aqueous solutions is the most well-established and efficient approach to CCUS technology. However, these solutions can corrode carbon steel infrastructure, impacting production safety and cost-effectiveness. This study identifies a high CO2 loading (1.2561 mol mol–1) ternary system of 1,4-butanediamine (BDA), ethylene glycol (EG), and 70 wt % H2O (BE70H). The corrosion behavior and mechanism of BE70H on 20# carbon steel (20CS) were studied by weight loss test, ICP-OES analysis, electrochemical experiment, and various characterization techniques, with 30 wt % MEA solution was selected as a reference. The results show that the CO2-loaded amine solution is more corrosive to 20CS than the fresh solution. Fresh and CO2-saturated BE70H solutions (BE70HS) exhibited lower corrosion rates and lower iron concentrations. The characterization results showed that the surface of 20CS corroded by BE70HS formed a dense siderite (FeCO3) film. This film is believed to provide better corrosion inhibition than the chukanovite (Fe2CO3(OH)2) film formed in MEA-saturated solutions. The quantum chemical parameters, such as EHOMO, ELUMO, and ΔE, indicate that BDA molecules exhibit stronger adsorption on the surface of 20CS compared to MEA, effectively inhibiting the penetration of corrosive agents. The FeCO3 film and the adsorbed BDA layer on the 20CS surface are considered the major and minor pathways of corrosion inhibition, respectively. Furthermore, the phase separation behavior of the BE70H solution can potentially lead to differences in corrosiveness, making it a critical factor to consider in equipment anticorrosion design.
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REACTIVE & FUNCTIONAL POLYMERS
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2023
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IF 5.1
Haoran Tian,Zhifei Zhu,Feng Ma,Junying Li,Jian Li,Yingzhou Li,Pengfei Yang
The treatment of dye pollutants in wastewater was a serious environmental issue. In this paper, freezing radical polymerization was used to prepare poly (polyethylene gly co l diacrylate - co - maleic anhydride) (p(PEGDA- co -MA)) cryogels with redox initiators of ammonium persulfate / tetramethylethylene diamine in aqueous solution. The mechanical property and chemical structure of cryogels were characterized compression tests, IR, and XPS. After that, adsorption performance of p(PEGDA- co -MA) cryogels for cationic dyes was measured and the maximum adsorption capacity for methylene blue and crystal violet was 447.7 mg·g −1 and 329.5 mg·g −1 (pH = 7.0), respectively. Adsorption isotherm , adsorption kinetics and adsorption thermodynamics were investigated to reveal adsorption mechanism of cryogel materials, which showed that monolayer chemical adsorption was dominant and the adsorption capacity decreased with the increase of temperature. This p(PEGDA- co -MA) cryogels would not only partly developed the polymerization method of vinyl monomers but also strongly expanded the field of dye adsorption materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Chaowu Wang,Qibo Zhang
Efficiently recovering critical metals from secondary resources is crucial to decreasing the environmental impact of mineral-resource mining and reducing production costs and process energy consumption. Herein, we propose a simple and comprehensive approach to recycle Co 3 O 4 from waste choline chloride/ethylene glycol (named Ethaline) electrolyte containing Co(II) ions along with solvent regeneration. Through the rational coordination adjustment using water, [CoCl 4 ] 2− complex in the Ethaline-based electrolyte is transformed to [CoCl 2 (H 2 O) 4 ] 0 and [CoCl 2 (H 2 O) 5 ] + to facilitate precipitation separation. Adding oxalic acid (OA) as a precipitator can reach 97.1% cobalt recovery efficiency with a high value-added Co 3 O 4 rod-like structure obtained by calcining the oxalate precipitate. In addition, the water-containing solvent can be regenerated via reduced pressure distillation with a high recovery efficiency of up to 98.0%. FT-IR and 1 H NMR characterizations verify that the regenerated Ethaline exhibits good structural stability. Impressively, the proposed recovery path shows high recovery efficiencies for both cobalt and Ethaline in various practical Co(II) ion-containing electrolytes. This study establishes a novel technical pathway for the resource utilization of metal-bearing waste Ethaline electrolytes, which shows an excellent prospect in solvent recycling after metal processing.
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FUEL PROCESSING TECHNOLOGY
·
2023
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IF 7.5
Mengting Gao,Zelin Li,Baozheng Zhao,Shitao Yu,Lang Huang,Qiong Wu
Nickel‑tungsten co-doped spherical carbon-based catalysts (m%Ni-n%W-GC T ) are prepared by one-pot hydrothermal‑carbonization using glucose as carbon host. Structural composition of tungsten transforms from WOx → W → WCx when increasing carbonization temperature and tungsten loading content at the presence of Ni during hydrogen reduction , attributed to the occurrence of carburizing reaction. The carbon-based catalysts exhibit developed porous structures with weak and moderately strong acidity, and the Brønsted acid and total acid contents increase with promoting tungsten loading content. Investigation of m%Ni-n%W-GC T activity on catalyzing cellulose hydrogenolysis shows that the porous structure provides abundant reaction sites and facilitates reactant transportation, where the Brønsted acid sites promote hydrolyzing cellulose, and WC x is beneficial for hydrogenolysis of glucose other than direct hydrogenation and then Retro-Aldol condensation for ethylene glycol (EG). The optimized reaction condition (2 h at 230 °C and 5 MPa with 9%Ni-13.5%W-GC 850 as the catalyst) delivers a cellulose conversion of 100%, with 69.2% selectivity for EG. The study provides an effective method for preparing EG from cellulose employing biomass-based carbon as the catalyst support.
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Polymers
·
2023
·Vol. 15
·期 10
·2363
·
IF 5
Di Wang,Ren Zhang,Jin Liu,Bibi Ji,Wenping Wang,Mengyuan Peng,Chen Huang,Lizhuoran Cheng,Yi Ding
A novel one-dimensional malleable spin-crossover (SCO) complex {[Fe(MPEG-trz)3](BF4)2} has been successfully synthesized by molecular self-assembly between 4-amino-1,2,4-triazoles (MPEG-trz) grafted with a long flexible chain methoxy polyethylene glycol (MPEG) and metallic complex Fe(BF4)2•6H2O. The detailed structure information was illustrated by using FT-IR and1H NMR measurements, while the physical behaviors of the malleable SCO complexes were systematically investigated by using magnetic susceptibility measurements using superconductivity quantum interference device (SQUID) and differential scanning calorimetry (DSC). This new metallopolymer exhibits a remarkable spin crossover transition behavior, between two spin quantum states (Fe2+ions): high spin (HS) state (quintet state) and low spin (LS) state (singlet state), at a specific critical temperature with a slender hysteresis loop of 1 K. DFT computations revealed the partial rules of HOMO-LUMO energy levels and spin density distributions of different four-position substituted [Fe(1,2,4-triazole)3]2+derivatives with different length of repeat units in polymer complexes. This can go a step further to depict the spin and magnetic transition behaviors of SCO polymer complexes. Furthermore, the coordination polymers possess an excellent processability due to an outstanding malleability, which can be easily shaped into a polymer film with spin magnetic switching properties.Keywords:spin crossover (SCO) complex;malleable;magnetic transition polymer;modification;MPEG films
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Luping Chen,Shixiang Liu,Fengyuan Gao,Hailin Cong,Bing Yu,Youqing Shen
Transcatheter arterial chemoembolization (TACE) is one of the common methods of treating tumors and usually requires an accompanying injection of an exogenous contrast agent, but the exogenous contrast agent is highly susceptible to removal by blood flow , which greatly reduces the efficiency of the operation. Here, we developed a uniformly sized Ag 2 S/BaSO 4 /DOX@PEGDAMS that integrates embolization, drug loading, and visualization with a microfluidic device . The microspheres can be imaged stably under NIR-II/X-ray for a long time, and the luminescence of NIR-II is better than that of X-ray. This breaks the limitations of conventional X-ray-only imaging of embolic microspheres . The microscope images and scanning electron microscope EDS results showed that the microspheres were regularly spherical with uniform particle size, and the signature elements such as Ag, S, and Ba were uniformly distributed in the microspheres. In vitro cytotoxicity assays and apoptosis assays have demonstrated that the microspheres have good biocompatibility and can effectively inhibit tumor cell growth due to the presence of DOX. The ability of microspheres to aggregate in blood vessels and block blood flow was verified by modeling and embolizing in rabbit ear tumors. In conclusion, Ag 2 S/BaSO 4 /DOX@PEGDAMS shows excellent embolization, drug loading, and imaging capabilities, and has the potential to be used for TACE and other diseases requiring interventional embolization therapy.
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RSC Advances
·
2023
·Vol. 13
·期 13
·8901-8914
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IF 3.9
Xinkuai He,Zhousi Hu,Qingtian Zou,Jingjing Yang,Ruqing Guo,Luye Wu
The preparation of active, stable and low-cost non-noble electrocatalysts for the hydrogen evolution reaction (HER) using the electrochemical water splitting process is crucial for the promotion of sustainable energy. In this study, Co–Ni alloys with various Co contents are prepared using a galvanostatic method and the co-deposition behavior of Co2+ and Ni2+ in ethylene glycol (EG) is reported. These results indicate that the presence of additional Ni2+ species can accelerate the Co–Ni co-deposition process and Co2+ species in the system can inhibit the reduction of Ni2+. Moreover, the two effects are improved with an increase in Ni2+ or Co2+ species concentration in the EG system, respectively. Chronoamperometry records show that the Co–Ni electro-crystallization mechanism is one of 3D instantaneous nucleation and growth. Moreover, the Co–Ni alloy with 59.46 wt% Co exhibits high electrocatalytic activity for HER with an overpotential of 133 mV at 10 mA cm−2 in 1 M KOH due to a high value of electrochemical active surface area (ECSA) (955.0 cm2). Therefore, the Co–Ni alloy electrocatalyst obtained from the EG system could be a promising candidate for practical hydrogen production.
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THERMOCHIMICA ACTA
·
2022
·
IF 3.378
Lili Feng,Runxiang Yu,Yang Li,Yushen Huang,Lei Zhao
Aiming at the problems of easy leakage and low thermal conductivity of solid–liquid phase change materials (PCM), and the recycle of fly ash, ordered mesoporous silica (OMS) was synthesized from fly ash to prepare the shape–stabilized PCM (SSPCM) with various polyethylene glycol (PEG) mass fractions. Aminoated multi–walled carbon nanotubes (MWNT–NH 2 ) were added into SSPCM for enhancing the heat transfer rate. The structure of PEG remains intact after blending with OMS. The shape–stabilization capacity of OMS to PEG was up to 90 wt%. The leakage problem of solid–liquid PCM can be effectively solved owing to the interactions between OMS and PEG, such as surface adsorption, mesoporous confinement and hydrogen bonding. The melting enthalpy of PEG/OMS SSPCM with 90 wt% PEG reaches up to 133.7 J g −1 , and its heat storage efficiency is 90%. SSPCM exhibits excellent thermal stability and reliability. Its thermal conductivity is increased by 191.3% upon the addition of 5 wt% MWNT–NH 2 comparing with PEG.
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DYES AND PIGMENTS
·
2019
·
IF 4.018
Mingguang Yu,Songjing Zhong,Yusi Quan,Houhe Liu,Junyang Zhong,Xinlin Jiang,Yisi Wang,Guodong Ye,Chunping Ma,Yugang Huang
A synthetic polypeptide-based bioconjugate bearing tetraphenylethylene (TPE) at the polypeptide side chains, named mPEG-PPLGgTPE, was synthesized by ring-opening polymerization (ROP) of α -amino acid- N -carboxyanhydride (NCA) along with post-polymerization modification method. Interestingly, the bioconjugate enabled both the aggregation induced emission (AIE) effect at 469 nm and the aggregation caused quenching (ACQ) effect around 365 nm depending on water fraction in the tetrahydrofuran/water (THF/H 2 O) mixed solution, and this feature was very different from the commonly used TPE-based AIE polymers. The strong emission at the 365 nm was a rarely seen monomeric emission for the TPE units. Further studies on the fluorescence spectra indicated that the monomeric emission was not related with the secondary structure of polypeptides, but caused by the TPE unit itself. The mPEG-PPLGgTPE could self-assemble to AIE nanoparticles (NPs) in water in a mean size of 253 nm with polyethylene glycol (PEG) as the shells in surface. In addition, HeLa cell uptake level of the NPs was unsatisfactory according to the cell imaging results, which was independent of the polypeptides conformation, the PEG length and the size of NPs.
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POLYMER ENGINEERING AND SCIENCE
·
2019
·Vol. 59
·期 5
·1043-1050
·
IF 1.92
Yi-Kai Zhan,Shuai Du,Min He,Dao-Hai Zhang,Yu-Fei Liu,Li-Ping Li
In this study, a carboxy esterification reaction was used to graft the hydrophilic polymers polyethylene glycol (PEG) and polyvinyl alcohol (PVA) onto the surface of carbon fibers (CFs). The properties of the grafted CFs were investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TG) and through the measurement of interlaminar shear strength (ILSS). SEM enabled the graft morphology on CF surfaces to be determined. In comparisons of grafted and non-grafted CFs, AFM indicated that the roughness was significantly improved; XPS showed that the concentration of oxygen-containing functional groups increased by 186.1%; TG showed that the grafting rate of CF -grafted PEG ( CF -g-PEG) was 0.5%, and that of CF -grafted PVA ( CF -g-PVA) was 2.0%; and the ILSS of CF -g-PEG and CF -g-PVA increased by 22.7% and 43.0%, respectively. We conclude that esterification grafting is an effective method for modifying the physicochemical properties of CFs and improving the interfacial adhesion of composites. POLYM. ENG. SCI., 59:1043–1050, 2019. © 2019 Society of Plastics Engineers
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POLYMER SCIENCE SERIES B
·
2019
·Vol. 61
·期 3
·240-246
·
IF 0.907
Xian Rong Shen,Xiang Yi Xin,Gao Jian Gang
Abstract Supplemental activator and reducing agent atom transfer radical polymerization (SARA ATRP) of methyl acrylate was successfully performed in inexpensive, eco-friendly polyethylene glycol solvents and catalyzed by a mixed sulfite/CuBr 2 system at room temperature. The presence of polyethylene glycol in the reaction mixtures allowed fast and controlled polymerizations throughout the whole reaction time. Remarkably, a fast polymerization can be achieved with a monomer conversion reaching 90% in only 50 min using PEG 200 as the reaction solvent. The controlled character of the ATRP of methyl acrylate was confirmed by the linear increase in molecular weight with monomer conversion, the narrow molecular weight distributions ( M w / M n = 1.15) and the results of chain extension experiments. 1 H NMR analysis also confirmed the molecular structure and chain-end functionality of the obtained polymers, and the effects of PEG molecular weight and inorganic sulfites on the polymerization behavior were investigated.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Phongphat Prawang,Yongqiang Zhang,Ying Zhang,Hui Wang
Poly(ethylene glycol) (PEG), a kind of “green” medium, was used to extract artemisinin from the Chinese herb Artemisia annua L. to replace the traditional volatile and explosive solvents like petroleum ether, diethyl ether, etc. PEGs, with different molecular weights, show excellent ability for artemisinin extraction, and the extraction efficiency decreased with the increase of molecular weight. It was also demonstrated that ultrasonic irradiation could further enhance extraction efficiency compared with conventional water bath heating. Results indicate that the extraction amount of artemisinin from one gram of the leaves could reach 15.8 mg/g under the optimal conditions with ultrasonic power of 100 W, the temperature of 50 °C, time of 1 h in PEG-200, which were optimized by response surface method. Compared with Soxhlet extraction using petroleum ether (PE), the method developed here shows higher extraction efficiency (15.8 mg/g for PEG vs. 14.9 mg/g for PE process) and shorter extraction time (1 h vs. ca. 12 h). Additionally, artemisinin in the PEG solution can be recovered using resin adsorber. The results show that the recovery of artemisinin could reach almost 100% by D101 or H103 porous resin, and then the drug could be desorbed from the resin by ethanol or ethyl acetate. Moreover, the kinetic and mechanism studies of the extraction process revealed that ultrasonic irradiation could enhance mass transfer and the hydrogen bonding interactions between artemisinin and PEG further facilitate the separation of artemisinin from the leaves. This work provides an alternative process for efficient artemisinin extraction by using an environmentally benign medium with outfield intensification, which could be potentially extended to the production of other natural drugs.
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