Environmental Chemistry Letters
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2021
·Vol. 19
·期 4
·3511-3515
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IF 9.027
Si Huimin,Che Mingda,Chen Zhiguo,Qiu Sha,Cui Mei,Huang Renliang,Qi Wei,He Zhimin,Su Rongxin
Chloroform is an harmful chlorinated hydrocarbon which is hardly degraded using actual dechlorination methods. Alternatively, carboxymethyl cellulose/zero-valent iron appears promising to degrade chlorinated hydrocarbons in water, yet actually carboxymethyl cellulose cannot inhibit the oxidation and sedimentation of iron ions under alkaline condition. Here, polyethylene glycol, a green and low-cost non-ionic polymer, was used as a stabilizer to synthesize polyethylene glycol-stabilized Fe/Ni nanoparticles (PEG-Fe/Ni) for removing chloroform from water in a wide range of pH, from 3 to 11. PEG-Fe/Ni was prepared by a stepwise liquid-phase chemical reduction, then added into groundwater to remove chloroform. Results show that polyethylene glycol can both reduce the particle size from 106.9 to 79.6 nm and prevent the oxidation and sedimentation of iron ions under alkaline condition. The removal efficiency of chloroform increased from 86.3 to 100% at pH 6 in the presence of polyethylene glycol, and slightly decreased to 95.4% at pH 11. The calculated rate constant ( k ) indicates that chloroform removal follows pseudo-first-order kinetics. Furthermore, the PEG-Fe/Ni also removed chloroform from real groundwater at pH 8 with an efficiency of 90.1% in 4 h, which is higher than that for Fe/Ni nanoparticles, of 41.7%.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Qianghua Xin,Shitao Yu,Long Jiang,Defu Yin,Lu Li,Congxia Xie,Qiong Wu,Hailong Yu,Yuxiang Liu,Yue Liu,Shiwei Liu
The preparation of small molecule compounds with a high value from biomass has always been the focus of research, and catalysts with high activity and stability are an essential part of biomass conversion. In this work, yolk–shell nanospheres (YSNSs) with the high hydrogenation activity metal Pd as the core and mesoporous silica as the shell were prepared firstly, and then the bifunctional catalyst Pd@WOx–MSiO2 YSNSs was obtained by loading tungsten oxide on the surface of yolk–shell nanospheres. The structure characterization showed that the prepared Pd@WOx–MSiO2 YSNSs had a good shell–void–core structure, the amorphous WOx species was uniformly dispersed on the surface and channel of the mesoporous silica shell, and there were no bulky WO3 crystals. A series of Pd@WOx–MSiO2 YSNSs catalysts with different tungsten contents were used to catalyze the directional preparation of ethylene glycol (EG) from glucose. The conversion of glucose was 99.3% and the selectivity of EG was 59.4%. According to the analysis of the acidity of the catalyst and the valence state of the metal, the catalyst had weak Lewis acidity, which could promote the cleavage of the C–C bond in glucose, and W5+ could produce oxygen vacancy to adsorb oxygen into glucose, so that the tungsten species can effectively promote the selectivity of EG. Pd@WOx–MSiO2 YSNSs were very different from other supported catalysts in structure and the distribution of active sites. Compared with traditional supported catalysts, Pd@WOx–MSiO2 YSNSs had higher activity and stability due to their unique yolk–shell structures and the protection of the inner Pd nanoparticles by the mesoporous silica shell.
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HEAT AND MASS TRANSFER
·
2021
·
IF 2.464
Liu Changhui,Jiang Pan,Huo Yixuan,Zhang Tianjian,Rao Zhonghao
With the continuing development in the electric industry, highly efficient heat dissipation is of great significance due to the shrinkage of electric elements and increase in energy input. Working fluid, acting as a heat transfer medium, plays a core role in the thermal management. While, traditionally used working fluids suffer from either low thermal conductivity or relatively narrow liquid range that are unable to meet the growing demands for highly efficient thermal management. In this work, a silica decorated graphene (SDG) was fabricated using a sol-gel method and dispersed in a deep eutectic solvent (DES) system with the aim at addressing the poor thermal conductivity, stability and narrow working temperature range simultaneously. It is verified that the stability of nanofluids can be significantly improved since it could be kept for one week without obvious precipitation and aggregation due to the presence of silica coating on the layer of graphene. On the other hand, an 11.26% thermal conductivity enhancement was obtained by filling only 3.0 wt. % of the SDG. Moreover, viscosity study reveals that the presence of SDG has a slight influence on the rheological property of the nanofluids.
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 6
·1055-1062
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IF 1.931
LYu Zijian,Wang Fei,Liu Peng,Zhang Kai,Sun Qian,Bai Xiaoyu,Li Aixiang,Song Xinhua
Lutein-b-methoxy polyethylene glycol (Lutein-b-mPEG) encapsulated lutein nanoemulsion was prepared. First, mercapto-terminated mPEG (mPEG-SH) was prepared. Then, vinyl-terminated lutein was prepared by the esterification reaction of lutein and allyl chloroformate. Finally, Lutein-b-mPEG was synthesized by the thiol-ene reaction of the vinyl-terminated intermediate and mPEG-SH. Lutein-b-mPEG was self-assembled in water to form spherical micelles, and the unreacted lutein was directly loaded in the micelles. The synthesis of the block copolymer and loading of unreacted lutein are completed in one pot. The results of IR, 1 H NMR, GPC, and surface tension showed that the Lutein-b-mPEG was prepared. The TEM results showed that Lutein-b-mPEG loaded lutein self-assembled in water to form spherical micelles, and the average size is larger than that of Lutein-b-mPEG micelles. The chemical stability of lutein loaded by Lutein-b-mPEG micelles is greatly enhanced. Moreover, due to the water solubility and micellization of lutein, it is possible to greatly increase its bioavailability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Fangfang Ren,Xuanrong Chen,Rong Xing,Yukou Du
Anode catalyst is one of the core components of fuel cell, but its poor catalytic activity, short lifespan, and high price are tricky problems to the commercialization of fuel cell. Herein, a novel rod-like MnO 2 decorated reduced graphene oxide (RGO) supported Pd hybrid (Pd/RGO-MnO 2 ) has been designed, which manifests more negative onset oxidation potential, higher peak current density, and better long-term stability relative to Pd/RGO and pure Pd catalysts when serving for ethylene glycol electrooxidation . This enhancement may be due to the addition of MnO 2 , which can effectively promote the adsorption of hydroxyl at a lower potential and produce a strong electronic interaction with Pd, as confirmed by X-ray photoelectron spectroscopy (XPS) technique. In view of its excellent performance and low cost, Pd/RGO-MnO 2 is considered to be a potential and effective anode catalyst for DEGFCs.
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高影响因子
Biomaterials Science
·
2020
·Vol. 8
·期 24
·6969-6977
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IF 6.183
Bo Zhang,Min Li,Min Lin,Xuan Yang,Jing Sun
Bioinspired polypeptoids show great potential in many applications. Here, we report a convenient approach to synthesize a novel type of polypeptoid containing both sulfonium and oligo(ethylene glycol) (OEG) moieties by ring-opening polymerization (ROP) and a post-modification strategy. Three types of epoxides with (OEG)n (n = 1–3) groups are involved to offer various functionalities. The obtained polypeptoid sulfonium salts show positive ζ potential, irrespective of the solution pH and the degree of polymerization (DP). We demonstrate that the polypeptoids exhibit excellent antibacterial activity against Staphylococcus aureus (S. aureus) with MIC (minimal inhibitory concentration) in the range of 3.9–7.8 μg mL−1. In addition, the polypeptoids have a low hemolysis property and good in vitro biocompatibility. Remarkably, the as-prepared polypeptoids show rapid and potent antibacterial activity within 5 min. These features suggest that the obtained polypeptoids offer great potential for antimicrobial agents.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
·
IF 3.408
Huimin Guo,Chao Li,Hongxin Hu,Xiaoyan Yu,Kimiyoshi Naito,Qingxin Zhang
Nanodiamonds are novel carbon nanoparticles , which have wide application prospect around various fields owing to the excellent properties. However, nanodiamonds exhibit great tendency to aggregate and this phenomenon extremely limits the application of nanodiamonds. Two simple and green approaches of “grafting from” and “grafting to” are conducted to modify nanodiamonds covalently with copolymer of poly(ϵ-caprolactone) and polyethylene glycol . The characterizations of FT-IR, Raman spectra and TGA indicate that the copolymers are covalently linked on nanodiamonds surface through “grafting from” and “grafting to” methods successfully and the grafting rates are 13.35% and 20.87%, respectively. Moreover, the modified nanodiamonds present smaller particle diameter, less aggregation and better dispersion in organic solvent according to the dynamic light scattering particle size analyzer, transmission electron microscopic analysis and natural sedimentation experiment, which may have potential application at many fields.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Mingxin Lv,Qianghua Xin,Defu Yin,Zhen Jia,Chunyan Yu,Teng Wang,Shitao Yu,Shiwei Liu,Lu Li,Yue Liu
The use of cellulose instead of oil to produce 1,2-propylene glycol (1,2-PG) is of great significance for building a sustainable world. Herein, we synthesize Fe3O4@SiO2/Ru-WOx core–shell magnetically recoverable catalysts containing both Lewis acid and metal active sites using well-shaped Fe3O4@SiO2 core–shell magnetic nanospheres as the substrate. We investigated the catalytic performances of the bimetallic catalysts with various metals as well as different metal contents and WOx loadings for the conversion of cellulose to 1,2-PG. The results showed that Fe3O4@SiO2/10%Ru-20%WOx was more favorable for 1,2-PG production, with a 1,2-PG selectivity of 32.4% and a cellulose conversion of 96.8%. Our characterization and activity tests suggested that WOx on the Fe3O4@SiO2 nanospheres produced abundant Lewis acid sites to effectively promote glucose isomerization to fructose before glucose undergoes the retro-aldol condensation reaction. Moreover, the Ru further hydrogenated the C3 intermediate to 1,2-PG. It was notable that the catalyst can be separated through a simple magnetic separation after the end of the reaction, and it still maintained high catalytic activity after 5 uses.
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ACS Applied Bio Materials
·
2019
·
IF 0
Yinlei Lin,Deliu He,Huawen Hu,Peng Yi,Xiaoting Liu,Jianhui Huang,Shaozhen Wu,Guangji Li
Amphiphilic polyurethane elastomers (APUE) were synthesized using a two-step polyaddition reaction based on the hydroxyl-terminated polydimethylsiloxane (PDMS) and polyethylene glycol (PEG) soft segments with the molecular weights (Mw’s) of 2000 and 1000, respectively. The effects of the PDMS/PEG contents on the properties and structures of the APUE were investigated. It was found that the APUE possessed high elongation, moderate tensile strength, and good thermal properties. In addition, the APUE showed tunable oxygen permeability (Dk) and water vapor transmission rate (WVTR), and a similar WVTR to that of skin could be obtained for the optimized sample (APUE2). Importantly, APUE also exhibited excellent antibacterial efficacy against two kinds of bacteria along with impressive cytocompatibility. All of the results demonstrated that the synthesized APUE will hold substantial potential for biomaterial applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Hui Li,Shufeng Shen
Kinetics of the reaction of carbon dioxide (CO2) with potassium prolinate (ProK) in water-lean ethylene glycol was measured using a stirred cell reactor at temperatures from 283.2 to 313.2 K with ProK concentrations ranging from 0.5 to 2.0 M. Physicochemical properties including Henry’s constant of N2O and CO2 were measured or estimated for the investigated solutions. A proposed correlation was used to calculate the liquid-side physical mass transfer coefficient. The observed reaction rate constants (kobs) were obtained from the measured absorption flux against CO2 partial pressure under the pseudo-first-order regime conditions. Results show that the overall pseudo-first-order rate constant kov increases remarkably as the increasing ProK concentration and temperature. The reaction order with respect to ProK is found to vary between 1.76 and 1.91 over the temperature range, which is quite different from that observed in aqueous ProK systems. The kinetic results were also nonlinearly regressed to fit the models based on zwitterion mechanism and termolecular mechanism. The expression for the rate of CO2 absorption was proposed as a function of the temperature and ProK concentration for the experimental conditions studied.
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FUEL
·
2018
·
IF 4.908
Jiajun Gao,Shuang Zhu,Yafen Dai,Chunyan Xiong,Chunxi Li,Weimin Yang,Xingmao Jiang
Polyethylene glycol (PEG) is not satisfactory for the removal performance of thiophenic sulfurs, e.g., low S-partition coefficient K N (S). The unsatisfactory K N may be due to relatively low content of active O atom on PEG. Modification replacing – OH group with – OCH 3 group can produce modified PEGs that have the higher active O-content. Polyethylene glycol dimethyl ether, which was commonly known as NHD, showed the higher K N than PEG. Its K N for dibenzothiophene (DBT) can reach as high as 3.99. The higher K N was dominantly ascribed to the contribution of the active O atom: (1) H-bonding with DBT; (2) group similarity between C-O-C and C-S-C. Further, methoxy polyethylene glycol (mPEG) showed the best selectivity for DBT to toluene, compared with NHD and PEG. The best selectivity of mPEG may be attributed to its higher active O-content than PEG’s and its stronger polarity than NHD’s. Moreover, NHD and mPEG can be regenerated and recycled for several times without significantly decreasing the desulfurization performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Chunyan Chen,Liujun Jin,Hongyuan Shang,Tongxin Song,Fei Gao,Yangping Zhang,Caiqin Wang,Cheng Wang,Yukou Du
Designing and fabricating highly active and efficient catalysts are of vital importance for the practical applications of direct ethylene glycol fuel cells (DEGFCs). In this study, we employ a feasible one-pot synthetic method to construct highly monodispersed PtCu nanospheres (NSs) as high-efficiency anode electrocatalysts for DEGFCs. Interestingly, the optimized carbon supported Pt 1 Cu 1 NSs can display the highest mass activity of 2146.9 mA mg −1 in 1 M KOH + 1 M EG solution under the scan rate of 50 mV s −1 , which is 1.9 times higher than that of commercial Pt/C catalysts. This is ascribed to the favorable electronic effect between Pt and Cu, which is beneficial for ethylene glycol oxidation reaction (EGOR) in fuel cells. Meanwhile, such monodispersed Pt 1 Cu 1 NSs can also exhibit excellent durability, where the Pt 1 Cu 1 catalyst retains 62.6% of the initial value after the cyclic voltammetry of 500 cycles. This work not only provides a significant approach for designing catalysts for fuel cells, but also constructs a novel class of active and stable electrocatalysts for EGOR.
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