MRS Communications
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2023
·Vol. 13
·期 4
·538-545
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IF 1.9
Yin Jinkun,Chu Yaoqing,Tan Lianjiang
Cu/N co-doped TiO 2 nanopowder was prepared with a facile sol–gel method. In the absence of stabilizing agents, the co-doped nanopowder with nanoscaled particle sizes was obtained. Doping didn’t change the anatase crystal structure of TiO 2 . Cuprite Cu 2 Cl(OH) 3 formed in the co-doped nanopowder. Based on ultraviolet–visible (UV–vis) spectroscopy and X-ray photoelectron spectroscopy (XPS) data, the mechanisms of significantly improved photocatalytic activity of the co-doped nanopowder were discussed. The antibacterial evaluation and cytotoxicity test suggested the nanopowder inhibited bacteria significantly under visible light and had ultralow cytotoxicity. This work provided a promising antibacterial agent with potential biomedical applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Haitao Shi,Jiajia Yang,Zia Ahmad,Haijun Zhang,Jiping Chen
Solid amine materials have emerged as a class of adsorbent with promising potential for CO 2 capture from gas mixtures, such as biogas and flue gas. In this work, we developed a novel CO 2 capture material via co-grafting of polyethyleneimine (PEI) on mesocellular silica foam (MCF), and (3-glycidyloxypropyl)triethoxysilane (GPTES) was first used as a bridging medium. In the fabrication procedure of MCF@G-35.6 %PEI, a simple impregration of PEI in MCF modified with epoxy groups was conducted. In this procedure, the co-grafting of PEI was realized in terms of a portion of PEI (21.3 wt%) was anchored on the pore surface of MCF via the epoxy/amine reaction and the rest of PEI (14.3 wt%) could be stably attached to the pore surface of MCF via its interaction with anchored PEI. After systematic evaluation, the MCF@G-35.6 %PEI exhibited a maximum CO 2 adsorption capacity of 2.78 mmol/g at 50 °C and 50 %RH and fast adsorption kinetics with equilibrium time (break through from C/C 0 = 5 % to 95 %) is 22.85 min. Meanwhile, outstanding CO 2 adsorption capabilities within a wide temperature range of 30–90 °C and a large concentration range of 5–30 % vol. CO 2 were obtained by the use of MCF@G-35.6 %PEI. More importantly, the MCF@G-35.6 %PEI also exhibited an excellent long-term stability over 50 consecutive cycles. CO 2 adsorption kinetics of the sorbent was found to follow Avrami’s fractional order model and intraparticle diffusion model. Furthermore, temperature-programmed desorption was conducted to investigate the desorption kneitics and adsorption mechanism. All these findings demonstrate the great potential of MCF@G-35.6 %PEI for carbon capture and sequestration (CCS) technology.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Zheng-Xue Wu,Le-Qing Fan,Jiao-Juan Chen,Xu-Geng Deng,Tao Tang,Yun-Fang Huang,Ji-Huai Wu
Ternary metal sulfides employed in supercapacitors exhibit better electrochemical performances than their counterpart oxides due to their superior conductivity. However, the insertion/extraction of electrolyte ions can lead to a significant volume change in electrode materials , which can result in poor cycling stability. Herein, novel amorphous Co-Mo-S nanospheres were fabricated through a facile room-temperature vulcanization method. It involves the conversion of crystalline CoMoO 4 by reacting it with Na 2 S at room temperature . In addition to the conversion of the crystalline state into an amorphous structure with more grain boundaries, which is beneficial for the transport of electron/ion and can accommodate the volume change generated by the insertion/extraction of electrolyte ions, the production of more pores led to an increased specific surface area. The electrochemical results indicate that the as-prepared amorphous Co-Mo-S nanospheres had a specific capacitance of up to 2049.7F/g@1 A/g together with good rate capability. The amorphous Co-Mo-S nanospheres can be used as the cathode of supercapacitors and assembled with an activated carbon anode into an asymmetric supercapacitor possessing a satisfactory energy density of 47.6 Wh kg −1 @1012.9 W kg −1 . One of the prominent features exhibited by this asymmetric device is its remarkable cyclic stability, with a capacitance retention of 107% after 10,000 cycles.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
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IF 6.1
Yun Xue,Yue-Lin Wang,Yu Li,Wen-Da Xu,Fu-Qiu Ma,Yang-Hai Zheng,Qing-Guo Zhang,Zhi Zhang,Mi-Lin Zhang,Yong-De Yan
Cation exchange resins (CERs) are widely applied to purify waste liquids generated during the operation of nuclear reactors. The radioactive nuclides 60 Co and 58 Co are important corrosion activation products in reactor cooling water. In this study, the simulated Co doped CERs were oxidized with ternary carbonate. According to the thermogravimetric analysis (TG), the decomposition of Co doped CERs includes three processes: 1. Elimination of the osmotic water; 2. Pyrolysis of sulfonic acid group; 3. Destruction of styrene–divinylbenzene copolymer . The X-Ray Diffraction (XRD) patterns indicate that sulfur mainly exists in the form of sulfate in waste salt. The Co 2+ undergoes the path of CoS 2 → Co 3 O 4 with the increase of temperature and the transition point is 650 °C. Combined with Fourier Transform Infrared Spectrometer (FT-IR) spectra and X-ray Photoelectron Spectroscopy (XPS) analysis, sulfonic acid groups begin to decompose at 350 °C. During the molten salt oxidation process , most of the sulfur in sulfonic acid groups is entrapped by carbonate as the form of sulfate, and a little of which remains as sulfone group, sulfoxide group and sulfur bridge in residue. When the resins are oxidized at 800 °C, the retention rate of Co 2+ is 97.3%, indicating that the molten salt oxidation can effectively remain Co 2+ and convert it into a more stable substance.
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ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Zhiren Wang,Kexia Jin,Khak Ho Lim,Pingwei Liu,Dan Lu,Xuan Yang,Wen-jun Wang
The enhancement of mechanical properties is highly required for the expanded applications of biodegradable polymers like poly(butylene adipate-co-terephthalate) (PBAT). The use of nanocellulose as reinforcing fillers is one of the effective approaches while preserving the biodegradability of polymers, but the dispersion of nanofibers in polymer matrixes is a great challenge. Here, we report an in situ fibrillation method to prepare nanocellulose-reinforced PBAT composite films with superior mechanical properties and enhanced degradability while promoting the easy dispersion of natural plant fibers in the polymer matrix, which overcome the limitation of natural fiber composites for thin film applications. A hemicellulose-rich holocellulose fiber was selected and silanized prior to melt compounding with PBAT, in which in situ fibrillation of fibers and the dispersion of in situ fibrillated cellulose nanofibrils (CNFs) occurred simultaneously. The nanostructure, mechanical properties, and degradability of the resulting composite films were characterized. Compared with pristine PBAT, the incorporation of 1 wt % CNF fillers increased the tensile modulus by 82% while possessing a tensile strength of 26 MPa, an elongation of 372%, and a toughness of 75 MJ/m3, surpassing most reported data. Moreover, the degradability of PBAT was enhanced as well. Altogether, this study paves a new way of making biodegradable nanocomposites, which expand the application areas, especially where films are required.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Qian Ma,Rong Qiang,Yulong Shao,Xiao Yang,Rui Xue,Bowen Chen,Yi Chen,Shijiang Feng
The demand of microwave absorption materials (MAMs) with unique morphologies and electromagnetic (EM) balance has become necessary in recent years. Due to the ease of synthesis and tunable structure, metal–organic frameworks (MOFs) are widely used for this special MAMs. In this study, a new three-dimensional hybrid MOF is proposed that is co-doped with six equally branched star morphologies. The Co-C composite has the same six-branched morphology as that of the precursor. When the EM wave is incident, this special structure makes it easier for the EM wave to enter the material vertically due to the expansion of the incident surface, which is effective in adjusting the transmission path of the electron and the reflection and distribution of the EM wave. Because of the special morphology and magneto-dielectric synergy, the Co-C composite shows a minimum reflection loss ( R Lmin ) of −48.5 dB at 11.0 GHz at an absorption thickness of 3.0 mm, with a microwave absorption bandwidth (EAB) of 6.1 GHz. This research provides a practical guidance for preparing the MAMs of special star structure.
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POLYMER BULLETIN
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2023
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IF 3.2
Wang Guoqiang,Dong Yakun
Poly(propylene 2,5-furandicarboxylate) is a kind of bio-based polyester, but the raw material (2,5-furandicarboxylic acid) is expensive. The purpose of this study is to investigate the effect of cheap 2,5-thiophenedicarboxylic acid on the synthesis and properties of poly(propylene 2,5-furandicarboxylate). 2,5-Furandicarboxylic acid, 2,5-thiophenedicarboxylic acid, and 1,3-propanediol were used to synthesize poly(propylene 2,5-furandicarboxylate), poly(propylene 2,5-thiophenedicarboxylate), and poly(propylene 2,5-furandicarboxylate-co-propylene 2,5-thiophenedicarboxylate). The thermal properties, dynamic mechanical properties, and rheological properties were characterized. The structures and properties of the copolymers were compared with those of two homopolymers. Fourier transform infrared spectroscopy and nuclear magnetic resonance spectra suggested that the copolymers were successfully synthesized. Differential scanning calorimetry and wide-angle X-ray diffraction results showed that poly(propylene 2,5-thiophenedicarboxylate) exhibited better crystallization ability. Compared with poly(propylene 2,5-furandicarboxylate), poly(propylene 2,5-thiophenedicarboxylate) is more prone to βrelaxation due to the larger angle between the two carbonyl groups connected to the thiophene ring and sulfur atom with weaker electronegativity.
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Nano Research
·
2023
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IF 9.9
Yue Meng,He Xun,Sun Shengjun,Sun Yuntong,Hamdy Mohamed S.,Benaissa Mhamed,Salih Alsamani A. M.,Liu Jun,Sun Xuping
Developing efficient and durable oxygen evolution reaction (OER) catalysts holds great promise for green hydrogen production via seawater electrolysis, but remains a challenge. Herein, we report a Co-doped Ni 3 S 2 nanosheet array on Ni foam (Co-Ni 3 S 2 /NF) as a high-efficiency OER electrocatalyst for seawater. In alkaline conditions, Co-Ni 3 S 2 /NF requires an overpotential of only 368 mV to drive 100 mA·cm −2 , superior to Ni 3 S 2 /NF (385 mV). Besides, it exhibits at least 50-h continuous electrolysis.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2023
·
IF 5.2
Hongmei Yang,Menglu Xu,Lili Zhang,Weiwei Fang,E. Liu,Huaxin Zhang
A benzotrizole-based hyper-crosslinked polymer (HCP) was employed to load cobalt and prepare a novel metal-containing nitrogen-doped carbon catalyst for the selective hydrogenation of quinoline . The high porosity, large surface area and nitrogen-containing monomer of HCP made a positive contribution to metal loading. Owing to the excellent thermostability of HCP, the original porous texture of HCP was partially reserved during pyrolysis , which resulted in highly dispersive Co species in the N-doped carbon material. The remaining mesopores in Co@CN catalyst during thermal decomposition provided available diffusion channels for substrates, which facilitated their full contact with catalytic active sites and their effective conversion. The prepared Co@CN catalyst achieved a conversion rate of 100% and a selectivity of 100% in the hydrogenation of quinoline into 1, 2, 3, 4-tetra-hydroquinoline in water at 100 °C under 3 MPa H 2 . The as-synthesized catalyst had good reuse performance, exhibiting >95% conversion rate and >99% selectivity even after 12 cycles. Moreover, the catalyst could also be applied to the selective hydrogenation of a serial of quinoline derivatives. The study provided a useful strategy for constructing metal-doped carbon materials which might be applicable for other metals and other reactions.
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EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
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2022
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IF 5.589
Zhe Wang,Xin Chen,Duanxiu Li,Enhe Bai,Hailu Zhang,Yanwen Duan,Yong Huang
Co-amorphous technology is an emerging approach for pharmaceutical engineering of drugs and drug leads with improved physicochemical properties and bioavailability. Platensimycin (PTM) is a promising natural antibiotic lead that acts on bacterial fatty acid synthase and exhibits excellent antibacterial activity . Despite great strides to improve its poor pharmacokinetics by medicinal chemistry and nanotechnology, there are no convenient oral delivery systems developed. Here, a co-amorphous system of PTM and berberine chloride (BCL) was developed for oral delivery of PTM. Co-amorphous PTM-BCL was prepared by rotary vacuum evaporation method, and systematically characterized by powder X-ray diffraction, temperature modulated differential scanning calorimetry , Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Compared with PTM or BCL alone, the equilibrium solubility and dissolution rate of both of them in the co-amorphous systems decreased significantly, showing the characteristics of sustained release . The molecular interactions between PTM and BCL were mediated by strong charged-mediated hydrogen bonds , based on FTIR, XPS, and NMR-based techniques. The co-amorphous PTM-BCL system showed excellent physiochemical stability at room and elevated (40 °C) temperature under dry conditions. The combination of PTM and BCL showed increased killing of a clinical isolated methicillin-resistant Staphylococcus aureus strain in killing checkerboard assays. Finally, co-amorphous PTM-BCL exhibited 2- or 3-fold longer half-life in rats than that of crystalline and amorphous PTM upon oral administration, respectively. Our study suggests a rational approach to realize the full potential of potent antibiotic PTM, which may be conveniently adapted for engineering of other important pharmaceutics.
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MATERIALS SCIENCE AND TECHNOLOGY
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2022
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IF 2.06
Hong Zeng,Wenbin Liu,Chongbin Wei
This study investigated the microstructure and properties of cemented carbides before and after the addition of Ru. The hardness and elastic modulus of the binder phase of Ru-containing cemented carbides were higher, and the hardness at room temperature and high temperature were also high. In particular, the oxidation resistance of Ru-containing cemented carbides was enhanced at high temperatures. Therefore, the solid solution-strengthening effect of the binder phase containing Ru was significant, which was conducive to the improvement of the high-temperature hardness and enhancement of the high-temperature characteristics of the alloy.
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JOURNAL OF FOOD ENGINEERING
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2022
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IF 6.203
Zhongyu Yang,David Julian McClements,Xinwen Peng,Zhenlin Xu,Man Meng,Long Chen,Zhengyu Jin
Composite nanoparticles composed of zein and carboxymethyl cellulose (CMC) designed for the co-delivery of resveratrol and quercetin were prepared using antisolvent precipitation. At a mass ratio of zein-to-CMC of 2:1, composite nanoparticles with small average diameters (217 nm) could be formed. These nanoparticles had good thermal stability and did not aggregate or sediment when stored at pH 3.0–6.0. Encapsulation of quercetin and resveratrol simultaneously within the composite nanoparticles significantly improved their antioxidant activities . This study suggests that composite nanoparticles may have good physical and chemical stability, which may increase their application as co-delivery systems for bioactive components. As a result, they may be useful for personalized nutritional applications where combinations of bioactive compounds need to be orally administered.
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