CATALYSIS SURVEYS FROM ASIA
·
2023
·Vol. 27
·期 3
·207-216
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IF 3
Li Shuying,Huang Bin,Jin Changzi,Wang Rui,Jiang Heng,Yang Guang-Sheng,Huang Shengjun
The conversion of ethanol and acetaldehyde to 1,3-butadiene has been an emerging process to produce key chemicals. The preparation of highly efficient catalysts and the understanding of reaction mechanism are current research priority. Herein, mesoporous silica framework confining zirconia (Zr-HMS) was prepared and act as catalyst for 1,3-butadiene production from ethanol and acetaldehyde. The prepared catalysts were characterized by Low-angle X-ray powder diffraction, transmission electron microscopy, N 2 physical adsorption-desorption, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and UV–vis spectra. It has been shown that the Zr-HMS exhibits similar textural properties to supported catalyst (ZrO 2 /HMS). However, regardless of their comparable activities, higher 1,3-butadiene selectivity is obtained over Zr–HMS, which can be due to the different active zirconia species in two catalysts. Mesoporous framework confining character of Zr-HMS can achieve uniformly dispersed zirconia species. Further investigation toward the reaction process has presented new viewpoints for formation and consumption of some typical intermediates and byproducts, which will help to understand the reaction mechanism and construct efficient catalysts for conversion of ethanol and acetaldehyde to 1,3-butadiene.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hongling Fang,Yi Li,Hua Li,Songwei Zhang,Qi Ding,Wei Yu,Litian Hu
The various forms of friction and wear present in mechanical systems consume a huge amount of the world’s energy sources. Ionic liquids (ILs) have drawn great attention as emerging lubricant materials and currently increasing efforts to drive their commercialization and engineering. Herein, one oil-soluble IL lubricant additive, 2-N-undecylimidazolium bis(2-ethylhexyl) phosphate ([C 11 -IM][DEHP]), has been prepared by “bottom-up” structural design. Compared to the commercially available lubricant additive zinc dialkyl dithiophosphates (ZDDPs) and existing oil-soluble ILs, [C 11 -IM][DEHP] shows significantly superior lubrication performance even at high normal loads (400 N). Its minimum effective concentration (0.1 wt%) is at least tenfold smaller than conventional additives. This extremely low effective concentration is vital to lower the total phosphorus content in the lubricating compounds for environmental protection and cost reduction. Furthermore, the lubrication mechanism was studied in detail by examining the electron transfer at the frictional interface and tribofilm analysis, which further reveal the lubrication nature at electronic scales for ILs.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 15
·6710-6726
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IF 4.5
Li Shengyu,Mao Weiye,Xia Linying,Wu Xijin,Guo Yingxue,Wang Jingwei,Huang Jie,Xiang Hai,Jin Lu,Fu Huiying,Shou Qiyang
Injectable hydrogels derived from natural extracellular matrices exhibit excellent adhesion to endothelial cells in vitro and are ideal for many biomedical applications. However, their applicability in vivo is limited by the risk of infection or immunogenicity, and the current injectables also suffer from degradation, viscosity, and drug release. In this study, a multifunctional hydrogel scaffold (COB hydrogels) was constructed by incorporating bioactive glass nanoparticles with a Schiff base crosslinking-based hydrogel composed of carboxymethyl chitosan and oxidized cellulose. The incorporation of nanoparticles not only shortened the gelation time of the COB hydrogels, but also enhanced the performance of the hydrogel in terms of function, such as drug loading capacity. The prepared hydrogels also have self-healing ability, injectability, drug loading and sustained release, antibacterial properties and biocompatibility. In addition, given their no cytotoxicity and mild inflammation in vivo, the hydrogel scaffolds will be important for tissue engineering and drug delivery applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ming Lei,Hua Huang,Junliang Liu,Feng Peng
In the demulsification process of crude oil emulsions, the temperatures of above 60 °C are most commonly required. In this work, a gemini ionic liquid (PGE-TFA) with amphipathy and interfacial activity was prepared by a simple and safe method, which could be used at the temperature of 40 °C for the effective demulsification of crude oil emulsions. The chemical structure and thermostability was investigated by FTIR, 1 HNMR and TGA . The demulsification tests of PGE-TFA showed that it had higher demulsification efficiency (DE) and faster demulsification rate than common commercial demulsifiers. PGE-TFA could be used at a low temperature of 40 °C, a wide pH range and high salinity. The DE reached as high as 95.53 % in water-in-oil emulsions with the concentration of 500 mg/L at 40 °C for 90 min. The temperature of 70 °C could slightly increase the DE and significantly improve the demulsification rate, and the DE of 97.72 % was obtained with the same concentration for 30 min. In addition, the demulsification mechanism was investigated by dynamic interfacial tension, competitive adsorption and zeta potential . The results displayed that PGE-TFA had amphipathy and interfacial activity, which promoted it quickly diffuse to the oil-water interface and displace asphaltenes at the interface. Therefore, an unstable composite film could be formed at the interface and the interfacial tension was lowered, which induced the demulsification of the emulsions.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Baolin Chang,Tiannan Cao,Zhizhang Shen,Yipu Zhang,Zhenyu Wang,Ji Li,Jinze Lyu
Obtaining high removal rate of chlorinated volatile organic compounds (CVOCs) and CO 2 selectivity with a low ratio of O 3 /CVOC and energy consumption is challenging. Dodecylamine was used in this study to create active sites on Co 3 O 4 for photo-ozone catalytic mineralization of dichloromethane (DCM). Amine-Co 3 O 4 -450 is a dodecylamine-modified sample with high density of Co 3+ , Co 2+ , and hydroxyl due to its nanosheet structure and exposed (112) facets. The optimized surface significantly enhanced the cleavage of the C–Cl bond at low temperatures. Photocatalysis primarily participated in the oxidation of intermediates following DCM dichlorination and significantly improved CO 2 selectivity. The respective DCM removal rate and mineralization efficiency of Amine-Co 3 O 4 -450 with an O 3 /DCM molar ratio of 1.27 and one-sun irradiation were 14.9 and 15.0 times higher than the sum of those in the presence of light irradiation or O 3 alone. This finding indicated that a strong synergistic effect exists between O 3 and light.
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Huan Xie,Ruikuan Xie,Zhiyuan Zhang,Yongyu Pang,Yuting Luo,Jiong Li,Bilu Liu,Maria-Magdalena Titirici,Guoliang Chai
The conversion of CO 2 into value-added chemicals coupled with the storage of intermittent renewable electricity is attractive. CuO nanosheets with an average size and thickness of ∼ 30 and ∼ 20 nm have been developed, which are in situ reduced into Cu nanosheets during electrochemical CO 2 reduction reaction (ECO 2 RR). The derived Cu nanosheets demonstrate much higher selectivity for C 2 H 4 production than commercial CuO derived Cu powder, with an optimum Faradaic efficiency of 56.2% and a partial current density of C 2 H 4 as large as 171.0 mA cm −2 in a gas diffusion flow cell. The operando attenuated total reflectance-Fourier transform infrared spectra measurements and density functional theory simulations illustrate that the high activity and selectivity of Cu nanosheets originate from the edge sites on Cu nanosheets with a coordinate number around 5 (4–6), which facilitates the formation of *CHO rather than *COH intermediate, meanwhile boosting the C C coupling reaction of *CO and *CHO intermediates, which are the critical steps for C 2 H 4 formation.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Zejun Zhang,Zhansheng Wang,Hua Zhang,Qingji Wang,Yuqi Tang,Qian Qu,Liwei Shen,Yuanzhu Mi,Xuemin Yan
In this paper, an ionic liquid demulsifier (MDBr-IL) with double cationic centers and multiple hydrophobic chains was synthesized with N,N,N,N,-tetraglycidyl- 4,4-diaminodiphenylmethane as starting materials. The structure of MDBr-IL was characterized by Fourier transform infrared spectrometer (FT-IR) and 1 H nuclear magnetic resonance spectrometer ( 1 H NMR). Effect of a few key factors such as concentration, demulsifying time, demulsifying temperature, salinity and pH value on the demulsifying efficiency (DE) was detailly researched in a water-in-crude oil emulsion. When the concentration of MDBr-IL was 500 mg/L, the DE reached 95.24% at 60 °C for 180 min. Also, the DE could increase to 98.64% when the demulsifying temperature was 70 °C. In addition, MDBr-IL had an eminent resistance to acid, alkali and salt. Also, the salinity could further improve the demulsification performance. Interfacial properties and wettability were employed to investigate the possible demulsification mechanism. It demonstrated that MDBr-IL is a viable demulsifier for the separation of oil-water emulsions.
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Mengyao Qi,Weijun Peng,Wei Wang,Yijun Cao,Guixia Fan,Yukun Huang
A simple and efficient approach of high-speed stirring scrubbing, reverse flotation and direct flotation was adopted to the purification of phosphogypsum (PG), and KH and dodecylamine hydrochloride (DH) were first used as the collectors of reverse and direct flotation, respectively. X-ray diffractometer (XRD), thermal gravimetric analyser (TGA), X-ray photoelectron spectrometry (XPS), and Fourier transform infrared spectroscopy (FT-IR) were used to characterise the samples and analyse the mechanism. KH selectively reactes with organic matter, slime, quartz and pyrite via hydrogen bond and dehydration condensation between the –OH in silanol hydrolyzed by KH and –OH on the surface of quartz and pyrite, and –COOH in the organic matter. Furthermore, the direct flotation collector of DH exhibited superior selectivity of gypsum via electrostatic attraction, and increased the whiteness and purity of the gypsum concentrate to 69.2% and 97.24%, respectively, and the soluble phosphorus and fluorine contents decreased to 0.046% and 0.024%, respectively. The gypsum concentrate reached the first-grade national standard of PG in China (GB/T 23456-2018). Therefore, this study provided a new approach for the purification of PG, which has an important guiding significance for the resource utilisation of PG.
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Biomaterials Science
·
2023
·Vol. 11
·期 6
·2056-2064
·
IF 6.6
Fen Yang,Xuan Wang,Jie Sun,Sijia Tan,Shizhe Zhou,Wenlong Tu,Xuexue Dong,Qicai Xiao,Fu Yang,Liqian Gao
Autophagy induced by nanomaterials is one of the intracellular catabolic pathways that degrade and recycle the biomacromolecules and damaged organelles in cells and has emerged as a very promising pharmacological target critical to future drug development and anti-cancer therapy. Herein, we developed mesopore-encaged highly-dispersed active cluster-like MnOx in nanosilica entitled MnO-MS, with a size of around 130 nm. Our studies show that MnO-MS could not only obviously induce autophagy in both stable GFP-LC3 HeLa cells and GFP-LC3-mCherry HeLa cells but also could selectively inhibit lung cancer A549 cell growth at 11.19 μg mL−1 (IC50) while exhibiting little cytotoxicity in normal cells. Encouraged by these interesting results, a further mechanistic study reveals that reactive oxygen species (ROS) were excited by the active MnOx in nanosilica, leading to the disruption of mitochondrial membrane potential (MMP), enhancement of ATG5A/ATG16L/ATG4B/Beclin1, and finally, inhibition of the mTOR signaling pathways. Collectively, these findings indicate that MnO-MS-induced cell death via autophagy pathways in cancer cells. Furthermore, MnO-MS significantly inhibited tumor growth with minimal side effects in vivo, and it is envisioned that MnO-MS can be further developed as a potential autophagy inducer for the treatment of lung cancers.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Lei Zeng,Wenbo Xie,Lijuan Jiang,Xingdong Yao,Hao Li,Boan Shi,Fuhou Lei
As green, less toxic, and abundant ligands with rich functional groups, natural products are widely used in synthesis of chromatographic stationary phases. In this work, dodecyl imide maleopimaric acid glycidyl methacrylate ester (C12-MPAGN) was prepared from maleopimaric acid through the imidization and ring-opening based esterification reaction. By using “thiol-ene” click chemistry, it was chemically bonded to the silica and (3-mercaptopropyl) trimethoxysilane (γ-MPS) was used as the coupling agent to obtain dodecyl imide maleopimaric acid glycidyl methacrylate ester bonded silica stationary phase (Sil-C12-MPAGN). Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopies (SEM), and elemental analysis (EA) were utilized to verify that the Sil-C12-MPAGN stationary phase was successfully prepared with C12-MPAGN immobilized on the silica surface. In order to evaluate the chromatographic performance and retention mechanisms of the Sil-C12-MPAGN column and compared with C18 column, a variety of compounds were used, including stander mixture of Tanaka, alkylbenzenes, polycyclic aromatic hydrocarbons (PAHs), phenols and flavonoids. Based on these multiple interactions, including hydrophobic, hydrogen-bonding, and π-π interactions, high selectivity and superior separation performance were demonstrated by the Sil-C12-MPAGN column for probe molecules what had previously been mentioned. In addition, the quantitative determination of paclitaxel content in Yew bark extract was conducted with this column, which was found that the concentration was 83.67 mg/L, respectively. In short, the present study proposes a new strategy for introducing rosin to liquid chromatography with high selectivity and separation performance.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Wenli Song,Bing Zhang,Wenli Zhou,Jilin Zhang,Liping Yu,Shixun Lian
All-inorganic perovskite quantum dots (PQDs, CsPbX3, X = Cl, Br, and I) show outstanding application prospects in the field of photoelectric devices. In recent years, the development of PQDs has greatly improved their stability to water, oxygen, and light. However, thermal quenching of PQDs greatly limits their practical application. Herein, we embed PQDs into ATiO3 (A = Ca, Ba, and Sr) of three different mesoporous spherical structures to explore the effect on thermal quenching of PQDs. Because of the unique mesoporous hollow microsphere structure and low thermal conductivity of SrTiO3, it can effectively block the heat transfer and improve the thermal quenching of PQDs. The photoluminescence (PL) intensity of CsPbBr3@SrTiO3 composites is 72.6% of the initial intensity after heating to 120 °C. Moreover, the PL intensity of CsPbBr3@SrTiO3 composites remains about 80% of the initial value even when stored in air for 20 days or irradiated by 365 nm UV light for 48 h. A neutral white light-emitting diode is assembled by a blue chip, CsPbBr3@SrTiO3 composites, and red phosphor of K2SiF6:Mn4+, which has a color temperature of 5389 K and a color gamut covered 133% of National Television Standards Committee (NTSC).
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Arabian Journal of Chemistry
·
2023
·
IF 6
Ruifeng Liao,Liangliang Shi.,Yi Zhou,Chenyue Jia,Jiangtao Feng,Weinong Zhang,Junbo He
Four novel nonionic 1-alkylaminoglycerol Gemini surfactants, represented by m-s-m ( m = C 8 and C 12 , s = 3 and 4), were synthesized through a two-step reaction in high yields, and confirmed by 1 H NMR, 13 C NMR, and HRMS. The synthesized Gemini surfactants exhibited low CMC (1.41–5.25 mmol/L), excellent surface-tension-reducing ability (25.45–26.83 mN/m), and wetting ability on hydrophobic interface. Gemini surfactants in aqueous solutions were in stable nanoscale dispersion, and exhibited strong and long-lasting foaming ability and emulsifying abilities for benzene/water and triacylglyceride/water systems. Especially, 12 – 4-12 solution displayed excellent tolerance to wide pH range and high salinity. Biological evaluation demonstrated that these Gemini surfactants, except for 8 – 4-8 , showed significant antibacterial activities against Staphylococcus aureus and Escherichia coli at 25 and 50 µg/mL. Hence, these Gemini surfactants have the potential to be used in a varieties of fields as highly efficient agents.
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