JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 22
·15474-15486
·
IF 2.993
Jiang Yijie,Chen Dezhi,Yang Wu,Wu Shaolin,Luo Xubiao
Ferrite, as a kind of common magnetic adsorbent, always tend to reuniting and lead to the poor performance for removing contaminant in aqueous. Meanwhile, reduced graphene oxide (rGO), a high-efficiency adsorbent used for water treatment, is hydrophobic and easy to stack because of the Van der Waals force, resulting in the low adsorption capacity. Herein, we prepare the magnetic CoFe 2 O 4 /rGO nanocomposites to solve the reuniting of CoFe 2 O 4 and stacking of rGO simultaneously. The rGO nanosheets can improve the dispersion of CoFe 2 O 4 nanoparticles. As sorbent, the adsorption behaviors of carbamazepine on the nanocomposites can be fitted well by the Langmuir and pseudo-second-order kinetic models. In addition, the CoFe 2 O 4 /rGO nanocomposites show enhanced adsorption performance than that of the pure CoFe 2 O 4 nanoparticles, and the loading of rGO can affect their adsorption performance. The adsorption of carbamazepine on CoFe 2 O 4 /rGO is exothermic and mainly controlled by π–π interaction and hydrogen bond interaction. Furthermore, the CoFe 2 O 4 /rGO can be used to remove other organic pollutants simultaneously. Finally, the nanocomposites can be collected by external magnet, and the regenerated nanocomposites still showed a high adsorption capacity retention (90%) after five cycles.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2015
·Vol. 33
·期 1
·107-113
·
IF 1.166
Zheng Lili,Zhang Weiping,Xiao Xinyan
Titanium dioxide/tungsten disulfide (TiO 2 /WS 2 ) composite photocatalysts were fabricated via a one-step hydrothermal synthesis process, using TiCl 4 as titanium source and bulk WS 2 as sensitizer. The morphology, structure, specific surface area and optical absorption properties of the composite photocatalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), specific surface area analyzer and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), respectively. The photocatalytic activity of as-prepared photocatalysts was evaluated by the degradation of methyl orange (MO) under illumination of 500W Xenon lamp. The results indicated that TiO 2 /WS 2 composite photocatalysts possessed excellent photocatalytic activity, and ∼95% of the degradation rate for MO was reached when molar ratio of WS 2 to TiO 2 was 0.004 and the irradiation time was 60 min. Moreover, the carrier trapping experiment and fluorescence spectra showed that ·O
− 2
was the key component in the photocatalytic degradation process and O 2 was reduced to be ·O
− 2
by the electrons from the conduction band of TiO 2 and WS 2 for the degradation of MO.
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Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 136
·期 1
·449-463
·
IF 1.843
Wang Jiaqi,Cheng Tiexin,Zhou Guangdong
In this work, calcium nitrate and sodium silicate were employed as the sources of calcium and silicon, respectively, to synthesize sheet calcium silicate hydrate (CSH) by simple chemical precipitation. The obtained sheet CSH exhibited fast adsorption rate and large adsorption capacity, the maximum adsorption capacity is 556.3 mg g −1 , for Cu(II) ions. The CSH after adsorption of Cu(II) ions (CSH-Cu) was characterized by XRD, FTIR, SEM, N 2 adsorption and XPS, and which could be converted into a catalyst for rhodamine B (RhB) degradation by a simple high-temperature activation process. The results showed that the catalyst give the excellent reusability, and after four cycles of the catalyst, more than 90% of the RhB could still be degraded within 240 min. The free radical trapping experiments showed that all of the ·OH, ·O 2 − and h + generated on the surface of the catalyst played an essential role in the degradation process, while h + made the largest contribution. Based on this, the degradation mechanism of RhB is also proposed.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2024
·Vol. 416
·期 6
·1417-1425
·
IF 3.8
Ma Xiaofei,Wang Qin,Cai Liangliang,Xiao Mingbing
Recently, deep eutectic solvents (DESs) have attracted considerable interest in analytical chemistry. This work described the enantioseparations of twenty amino alcohol drugs with several DESs based on lactobionic acid (LA) as the sole chiral selector in capillary electrophoresis (CE) firstly. Compared to the single LA system and the ionic liquid/LA synergistic system, the DES system exhibited considerably improved separations. The influences of some key parameters on separations were investigated in detail. This work also experimentally demonstrated that the carboxyl group was indispensable in the process of chiral recognition. The mechanisms of the improvements of DESs on enantioseparations were studied via ultraviolet spectroscopy. Furthermore, the proposed method was used to determine the enantiomeric purity of propranolol hydrochloride successfully. This is the first time that chiral DESs were utilized as the sole chiral selectors in CE, and this strategy has opened up a new prospect for the use of DESs in enantioseparation. Graphical abstract
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 11
·6362-6375
·
IF 2.599
Yang Lili,Jiang Guancheng,Shi Yawei,Lin Xin,Yang Xiao
Bentonite/water-based drilling fluids (BT-WDFs) suffer serious fluid loss particularly at high temperatures, pressure levels, and divalent cation concentrations. The ionic liquid 1-vinyl-3-ethylimidazolium bromide was introduced to synthesize a filtration control additive (PASV) through free radical copolymerization with acrylamide and 2-acrylamido-2-methylpropanesulfonic acid. The effect of the concentration of the ionic liquid on the filtration property of the fluids was determined at high Ca 2+ concentrations and temperatures. BT-WDFs added with 3.0 wt% copolymer exhibited excellent performance for controlling bivalent Ca 2+ -resistant fluid loss and tolerated the influence of Ca 2+ up to 70 wt%, which approaches the saturation at room temperature (25 °C). As the PASV concentration increased to more than 1.0 wt%, the fluid loss volume was less than 10 mL at room temperature, thereby ensuring safe drilling operation. When the formations drilled were at high temperatures, the filtration control performance was obtained by adding PASV additives. The requisite concentration of PASV varied from 1.5 to 3.0% at 80–150 °C. An extremely dense filter cake was produced because of the elimination of the influence of Ca 2+ on bentonite and the stabilization of the bentonite dispersion state by the PASV copolymer. These effects improved the filtration control performance of BT-WDFs. Moreover, the fluids exhibited shear thinning behavior over the shear rate range of 0.1–1000 s −1 , resulting in improved practical drilling process. This study provides a basis for applying ionic liquids in the design of additives for drilling fluids.
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高影响因子
Communications Materials
·
2024
·Vol. 5
·期 1
·1-9
·
IF 7.5
Xu Yuangang,Zhou Jianxin,Li Xinyi,Hou Tianyang,Xu Ze,Wang Pengcheng,Lu Ming
Because of its high energy, aromaticity, and carbon- and hydrogen-free structure, the cyclo -pentazolate anion ( c -N 5 - ) has attracted increased attention as a potential polynitrogen structural unit for the research of next-generation high energy density materials. However, the poor thermal stability of c -N 5 - -based compounds has become an important factor restricting their development. Here, we show that a hydrogen-bonded organic framework (HOF) self-assembles with and stabilizes c -N 5 - , with c -N 5 - situated in the pores of the resulting framework through the formation of symmetrical c -N 5 - hydrogen bonds as the main stabilizing factors. These factors result in an onset decomposition temperature of 153 °C for the c -N 5 - @HOF portion, which exceeds the thermal stabilities generally observed for c -N 5 - -based derivatives of below 135 °C. We envisage that further c -N 5 - -based materials with enhanced stabilities and better performance will be developed in the future.
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高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 1
·223-234
·
IF 6.123
Sun Nan,Wang Zeyu,Wang Zhaofeng,Jiang Dexing,Dai Yaohui,Ma Xi,Guo Zhenyu,Chen Yun,Sun Lihao,Lu Wang,Liu Yang
Abstract Inspired by the spontaneous healing of natural skin wounds, self-healing materials have become the focus of research. The repulsive conflict between mechanical and healing properties makes it challenging to optimize them simultaneously. Without sacrificing the healing properties, cellulose nanofiber (CNF)/polyurea (PU) composite materials with high mechanical strength were prepared using CNFs as filler and polyamine as cross-linking agent. To further improve the healing and repeated processing performance of the materials, dynamic disulfide bonds were also introduced into the CNF/PU composite materials. And the effects of disulfide bonds and cross-linking agents on the properties of CNF/PU composite materials were explored in detail. Among them, the tensile strength of CNF/PU-S-NH 2 is 14.51 MPa, the self-healing efficiency is 95.44%, and the tensile strength is 88.08% of the initial strength after four repeated processing. This research is of great significance for extending the service life of materials, slowing down the generation of waste materials, reducing environmental pollution, and making full use of renewable resources. Graphical abstract
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FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 6
·1963-1973
·
IF 2.5
He Duoduo,Qin Haiming,Qian Liying,Cao Xiuhua,Huang Jun,Li Junrong
The rapid development of wearable electronic raises the requirement of textile electrodes for biosignal acquisition. However, a big concern is the washability of the e-textiles during practical use, especially for the electrocardiogram (ECG) textile electrodes with metal coating on the fabrics. In this study, a conductive cellulosic fabric with high washability was fabricated by simple drop-coating methods. The cellulosic fabric was drop coated with the mixture of silver nanowires (AgNWs) and polyvinyl alcohol (PVA), and further cross-linked with glutaraldehyde (GA) to form a network to hold AgNWs onto the fabric to prevent AgNWs from falling off in washing. Due to the large amount of hydroxyl groups in the cellulose, it is feasible for GA to cross-link cellulose and PVA by reacting between aldehyde groups and hydroxyl groups. The conductive cellulosic fabric with three drop-coating cycles (3-AgNW/CF) showed excellent conductivity and good stability. The electrical resistance of 3-AgNW/CF increased from 0.43 to 7.63 Ω sq −1 after 100 washing hours. The conductive cellulosic fabric was applied in the smart garment as textile electrodes to acquire ECG signals, which could remain basically consistent after 80 washing hours and slightly deformed after 100 washing hours. The antibacterial efficiency of the conductive cellulosic fabric was 99.9% mainly owing to impalement of AgNWs into bacteria. Together with the facile fabrication protocol, the cellulosic textile electrodes with superb washability show great potential of consumer-level applications in ECG wearable electronics. Graphical
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高影响因子
IRANIAN POLYMER JOURNAL
·
2024
·Vol. 33
·期 5
·607-618
·
IF 2.4
Wang Guoqiang,Wu Yifan
Polylactic acid (PLA) is a biodegradable plastic with good tensile strength and can be produced from biomass. But there are some defects, such as poor ductility, low barrier properties and poor-UV resistance, which may limit the application and development of PLA. To increase the ductility of PLA, bio-based poly(butylene succinate-butylene furandicarboxylate) (PBSF) was combined with PLA to obtain the blends with different PBSF contents. The blend’s compatibility, crystallinity, thermal, mechanical and rheological properties were determined. The addition of PBSF inhibited the cold crystallization of PLA. Wide-angle X-ray diffractometry (WAXD) showed that the tensile sample of PBSF was semi-crystalline, and the tensile samples of PLA and the blends were almost amorphous. A substantial shift in the stretching vibration of C=O was observed in the FTIR spectra, indicating that the oxygen atom in the furan ring improves the intermolecular interaction between PLA and PBSF. The fracture surfaces of the blends varied from typical brittle morphology to ductile morphology as a result of the addition of PBSF. At 180 °C, the complex viscosity decreased as the PBSF concentration increased. Tensile strength was 31.5 MPa and elongation-at-break was 390% when the amount of PBSF in the blend reached 30% (by weight). The findings demonstrate that PBSF can improve the ductility and processability of PLA. Graphical Abstract
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高影响因子
Biotechnology for Biofuels and Bioproducts
·
2024
·Vol. 17
·期 1
·1-10
·
IF 3.3
Wang Lijuan,Deng Yongdong,Gao Jianjie,Wang Bo,Han Hongjuan,Li Zhenjun,Zhang Wenhui,Wang Yu,Fu Xiaoyan,Peng Rihe,Yao Quanhong,Tian Yongsheng,Xu Jing
Background The demand for melatonin is increasing due to its health-promoting bioactivities such as antioxidant and sleep benefits. Although melatonin is present in various organisms, its low content and high extraction cost make it unsustainable. Biosynthesis is a promising alternative method for melatonin production. However, the ectopic production of melatonin in microorganisms is very difficult due to the low or insoluble expression of melatonin synthesis genes. Hence, we aim to explore the biosynthesis of melatonin using Escherichia coli as a cell factory and ways to simultaneously coordinated express genes from different melatonin synthesis pathways. Results In this study, the mXcP4H gene from Xanthomonas campestris , as well as the HsAADC , HsAANAT and HIOMT genes from human melatonin synthesis pathway were optimized and introduced into E. coli via a multi-monocistronic vector. The obtained strain BL7992 successfully synthesized 1.13 mg/L melatonin by utilizing L-tryptophan ( l -Trp) as a substrate in a shake flask. It was determined that the rate-limiting enzyme for melatonin synthesis is the arylalkylamine N-acetyltransferase, which is encoded by the HsAANAT gene. Targeted metabolomics analysis of l -Trp revealed that the majority of l -Trp flowed to the indole pathway in BL7992, and knockout of the tnaA gene may be beneficial for increasing melatonin production. Conclusions A metabolic engineering approach was adopted and melatonin was successfully synthesized from low-cost l -Trp in E. coli . This study provides a rapid and economical strategy for the synthesis of melatonin.
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高影响因子
International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 11
·2270-2279
·
IF 4.8
Zhong Tao,Zhang Haoyu,Song Mengchen,Jiang Yiqun,Shang Danhong,Wu Fuying,Zhang Liuting
The catalytic effect of FeCoNiCrMo high entropy alloy nanosheets on the hydrogen storage performance of magnesium hydride (MgH 2 ) was investigated for the first time in this paper. Experimental results demonstrated that 9wt% FeCoNiCrMo doped MgH 2 started to de-hydrogenate at 200°C and discharged up to 5.89wt% hydrogen within 60 min at 325°C. The fully dehydrogenated composite could absorb 3.23wt% hydrogen in 50 min at a temperature as low as 100°C. The calculated de/hydrogenation activation energy values decreased by 44.21%/55.22% compared with MgH 2 , respectively. Moreover, the composite’s hydrogen capacity dropped only 0.28wt% after 20 cycles, demonstrating remarkable cycling stability. The microstructure analysis verified that the five elements, Fe, Co, Ni, Cr, and Mo, remained stable in the form of high entropy alloy during the cycling process, and synergistically serving as a catalytic union to boost the de/hydrogenation reactions of MgH 2 . Besides, the FeCoNiCrMo nanosheets had close contact with MgH 2 , providing numerous non-homogeneous activation sites and diffusion channels for the rapid transfer of hydrogen, thus obtaining a superior catalytic effect.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1023-1030
·
IF 3.1
Zheng Zhiwen,Dai Xin,Li Xueyang,Du Chang
M ore and more concerns about health bring the increasing demand for blood contact tissue engineering alternatives. In this paper, nanoparticles of poly(lactic-co-glycolic acid)/polyethyleneimine mixed with recombinant hirudin(rHNPs) were prepared by a double emulsion solvent volatilization method, which were then loaded onto the polycaprolactone(PCL) with polydopamine(PDA) coating to form the composite nanofibers of PCL/PDA/rHNPs. The hydrophilicity and mechanical properties of the composite nanofibers were improved significantly compared with pure PCL. The morphology kept almost unchanged after 30 d of degradation in phosphate buffer saline (PBS). The anticoagulant molecule of hirudin could be gradually released from the composite scaffolds through the degradation of rHNPs in vitro . When the concentration of rHNPs suspension was 5.0 mg/mL, the composite nanofibers could better promote the growth and proliferation of human umbilical vein endothelial cells(HUVECs). The anticoagulant ability of the composite nanofibers was also significantly improved in comparison with that of pure PCL. The design of controlled release anticoagulant materials would alleviate the sudden release of simple fixed hirudin, which could also provide a new idea for the development of novel blood contact materials.
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高影响因子
危险品化学品经营许可证（带存储）