JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 4
·1385-1393
·
IF 2.6
Qiao Jian,Shi Renqiang
Highly porous ceramics are of interest for various industrial applications, including filtration, supports for catalysts and biomedical applications, and insulating materials. In this study, porous mullite materials were fabricated utilizing the direct foaming-gelcasting approach with industrial-grade mullite powder and different sintering additives as the main starting materials. The phase compositions, pore microstructures, mechanical, thermal and dielectric properties were investigated in order to elucidate the relationships between the structure and performance of the porous materials. The results indicated that the porous mullite materials contained a hierarchical pore structure including interconnected and approximately spherical cells (40–230 μm) with no preferred orientation, along with small pores (5–40 μm) within the skeleton structure. The developed porous ceramics showed thin struts, large cells and internal windows, and a higher degree of total porosity. The porous mullite materials prepared with the addition of sintering aids (1 wt% SiO 2 and 2 wt% TiO 2 ) exhibited high porosity (~ 83%), good compressive strength (4.6–5.3 MPa) and low dielectric constant (1.5–2.0). Good thermal insulation and low dielectric loss are also available. These porous mullite materials are particularly applied for broadband microwave-transparent radome structures.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 1
·1-12
·
IF 2.8
Liang Xuan,Xue Suting,Wu Wangchen,Feng Qin,Zheng Xudong,Zhang Yakang,Xu Song,Zhou Man,Li Zhongyu
Herein, a series of CuS particles anchored three-dimensional ordered macroporous TiO 2 (CuS/3DOM-TiO 2 ) composites were fabricated by a biocompatible and environmental-friendly biomolecule-assisted route. For the first time in the macroporous 3DOM-TiO 2 , L-cysteine acted as multiple roles including sulfur source and chelating agent for anchoring of CuS particles. During the regulation by Cu/Ti molar ratios from 0.3 to 2, the average size of CuS particle which anchored on inner surface of 3DOM-TiO 2 was well-controlled from about 50 to 20 nm. The photocatalytic activities were investigated by visible-light degradation of methylene blue (MB). The highest activity of CuS/3DOM-TiO 2 was emerged when Cu/Ti equaled to 1. This optimized CuS/3DOM-TiO 2 -1 reached 99% in 180 min, which was 60% higher than that of pure TiO 2 . After four cycles, the photocatalytic activity of CuS/3DOM-TiO 2 retains more than 80% of its original performance. L-cysteine highly promoted the adhesion between CuS and TiO 2 which provided good cycling ability.
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JOURNAL OF FLUORESCENCE
·
2023
·Vol. 33
·期 4
·1593-1602
·
IF 2.7
Yu Caili,Lu Guangjie,Yan Chengfei,Xu Jianben,Zhang Faai
Rosin-based fluorescent polyurethane emulsion (FPU) was prepared using isophorone diisocyanate, ester of acrylic rosin and glycidyl methacrylate, 1,5-dihydroxy naphthalene (1,5-DN), and 1,4-butanediol as the raw materials. Then, rosin-based fluorescent polyurethane microspheres (FPUMs) were successfully prepared by suspension polymerization method using FPU as the main material, azodiisobutyronitrile as the initiator, and gelatin as the dispersant. FPUMs were characterized by Fourier transform infrared spectra, thermogravimetric analysis, optical microscopy, scanning electron microscopy and fluorescence spectra, and the response performance of FPUMs to pH was studied. The results showed that FPUMs were successfully prepared. With the increase of the level of 1,5-DN, the particle size of FPUMs increased gradually, and the fluorescence intensity increased first and then decreased. When the level of 1,5-DN was 3 wt.%, the average particle size was 49.3 μm, the particle distribution index ( PDI ) was 1.05, and the fluorescence intensity was the largest (3662 a.u.). The fluorescence intensity of FPUMs increased linearly with the decrease of pH, which can be used for pH detection in solution. Furthermore, the FPUMs exhibited good thermal stability, anti-interference and recoverability.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 4
·1-19
·
IF 2.8
Yao Bingdong,Zheng Guangwei,Luan Yina,Wang Lingxu,Xing Xuemin,Wang Yangyang,Liu Yan,He Jingxian,Zhang Fengqing
The morphology-controlled synthesis of nanostructured photocatalysts by an environmentally friendly and low-cost method provides a feasible way to realize practical applications of photocatalysts. Herein, Bi 2 WO 6 (BWO) nanophotocatalysts with mulberry shape, sheet-like, and round-cake morphologies have been successfully synthesized through a highly facile solvothermal process by simply adjusting the solvothermal temperature or utilizing selective addition of ethylene glycol as an orientation agent without using strong acids and bases and/or hazardous chemicals. The ratio of ethylene glycol and glacial acetic acid can affect the morphology and oxygen vacancy content of BWO, thereby influencing the photocatalytic performance. The photocatalytic activity of the as-prepared samples was evaluated by degradation of rhodamine B (RhB) and tetracycline under visible-light irradiation. The results indicated that all the BWO samples exhibited morphology-associated photocatalytic activity, and the sheet-like structure of BWO obtained via solvothermal treatment at 120 °C with ethylene glycol and glacial acetic acid ratio of 1:3 achieved the maximum specific surface area and possessed abundant oxygen vacancies, exhibiting outstanding photocatalytic activity for degradation of RhB and tetracycline. The degradation rate of RhB reached 100% within 20 min. To the best of our knowledge, this value is one of the most remarkable values for pristine BWO photocatalysts. Radical capture experiments demonstrated that hydroxyl radicals (·OH) play major roles compared with electrons (e − ) and holes (h + ) in the photocatalytic degradation process. A possible mechanism for the photocatalytic degradation of pollutants was proposed to better understand the reaction process. We believe that the more economical, efficient and greener methodology can provide guidance to develop highly efficient photocatalysts with favourable morphology and structure.
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Biomass Conversion and Biorefinery
·
2023
·
IF 4
Li Heng,Gao Song,Xie Wei-Hang,He Liang-Nian,Li Hong-Ru
As a kind of non-edible vegetable oil, castor oil has attracted considerable interest in developing bio-based products due to its unique structure, among which polyol ricinoleates are considered as promising alternatives to mineral oil-based lubricants. In this article, a Brønsted acid-functionalized silica-coated magnetic catalyst (Fe 3 O 4 @SiO 2 -IM-SO 3 H) was developed as the efficient heterogeneous catalyst for the preparation of polyol ricinoleates via the esterification of ricinoleic acid with trimethylolpropane (TMP), neopentyl glycol (NPG), and pentaerythritol (PE), respectively. The structure and magnetic property of the catalyst were characterized by Fourier infrared spectroscopy (FT-IR), X-ray diffractometer technology (XRD), element analysis (CHN), and vibrating sample magnetometer (VSM). As a result, the sulfonic group was proposed to promote the esterification and the magnetism facilitated the catalyst separation. Notably, the yield of polyol ricinoleates attained successfully up to 99.5%, and the catalyst was recycled for at least five times without obvious activity reduction. This work about the utilization of magnetic nanoparticles supported acid catalysts in polyol ricinoleates preparation features clean and sustainability, providing an example of developing green products.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 4
·1-12
·
IF 2.8
Wang He,Li Sirui,Zhu Hang,Yu Shaoyuan,Yang Tianye,Zhao Hongwei
For the rapid and accurate detection of trimethylamine (TMA) hazardous gases, a metal organic framework (MOF) derived bayberry-like In 2 O 3 architectures gas sensor was successfully prepared by a rapid and facile hydrothermal synthesis (30 min) and subsequent precise annealing process. The gas sensitivity test results show that the MOF-derived bayberry-like In 2 O 3 sensor has a low operating temperature of 120 °C, a response value of 23.2 to 20 ppm trimethylamine, a fast response speed of 1.4 s, and good selectivity and stability. In addition, the gas-sensing mechanism of the sample is discussed. It is considered that the unique MOF-derived bayberry-like architectures and the abundance of oxygen vacancies are the main reasons for its excellent gas-sensing performance. A possible growth mechanism is proposed by observing the morphological evolution of the samples at different stages. With excellent gas sensitivity, the MOF-derived bayberry-like In 2 O 3 architectures sensor will be an outstanding candidate for TMA gas detection application, seafood freshness detection, and renal disease detection.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-10
·
IF 2.8
Zhou Jintao,Zang Yue,Wang Yu,Chu Liang,Li Guodong,Xu Rui,Yan Wensheng
Silver nanowires have great development potential in the field of transparent electrodes, and their optoelectronic properties are closely related to the morphology and composition. During the synthesis of polyol method, the aspect ratio of AgNWs can be tailored using PVP with different molecular weights, and the diameter of AgNWs can be tuned by incorporating halides. Here, the synergistic effect of Cl − and Br − in the mixed PVP system were deeply investigated by adjusting the concentration ratio of Cl − and Br − . The growth mechanism of silver nanowires was studied by monitoring the acidity of the reaction process. It was found that under the assistance of PVP with different molecular weights, the coordination of Cl − and Br − greatly increased the activation energy of the reaction, which played a key role in the nucleation and growth of AgNWs. As a result, high-quality AgNWs with an average length of 35.7 μm and an average diameter of 67 nm were synthesized at the optimized concentration ratio of Cl − and Br − . Finally, the synthesized silver nanowires were deposited as conductive films on glass to obtain high-performance transparent electrode with a sheet resistance of 22.38 Ω/sq and transmittance of 83.95%.
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CHEMICAL PAPERS
·
2023
·Vol. 77
·期 6
·2967-2976
·
IF 2.2
Ma Mingming,Liang Juanli
The voltammetric behavior of 2-aminoazotoluene (2-AMAT) is studied at pencil electrode (PEC) modified by electropolymerization of β-cyclodextrin (P-β-CD-PEC) in different supporting electrolyte at various pH values using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). At the scan rate of 0.1 V s −1 , 2-AMAT exhibits an irreversible oxidation peak at 0.67 V in phosphate buffer solution (PBS) with the pH value of 6.64. The electrochemical data suggest that the oxidation reaction of 2-AMAT at the surface of P−β−CD−PEC involves one electron and one proton. 2−AMAT has a significantly higher oxidation peak current on P−β−CD−PEC than pristine PEC, which is ascribed to the presence of cavities in polymer of β−CD on the surface of PEC. Under the optimized DPV conditions, the oxidation peak current is linear with 2-AMAT concentration in the range of 0.3 μM to 30.0 μM with a low limit of detection (LOD = 0.14 μM) and high sensitivity (1.45 μA /μM). The same 2-AMAT concentration was measured every two days in 20 days using the same P−β−CD−PEC. The results show that the relative standard deviation (RSD) of the peak current was 3.36%, indicating that the stability of P−β−CD−PEC is good. Five different bitches P−β−CD−PEC was used to determine the same 2-AMAT concentration and 4.29% RSD is obtained, which suggests that the reproducibility of this modified electrode is excellent. In addition to some metal ions, the structural substances such as 2,4-diaminotoluene and 4-chloroaniline do not interfere the determination of 2-AMAT, suggesting that P−β−CD−PEC has fine selectivity. Therefore, a new method for detecting 2-AMAT based on P−β−CD−PEC is developed. This method is successfully used to determine 2−AMAT in rose lotion cosmetics with satisfied results.
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Nature Catalysis
·
2022
·Vol. 6
·期 1
·6-15
·
IF 40.706
Kong Shuyi,Lv Ximeng,Wang Xin,Liu Zhengzheng,Li Zichuang,Jia Bingquan,Sun Du,Yang Chao,Liu Lijia,Guan Anxiang,Wang Jiacheng,Zheng Gengfeng,Huang Fuqiang
Methanol manufacturing by CO 2 electrolysis is a potential near-zero-emission route to carbon neutrality, but most of the previous studies in aqueous electrolytes have achieved poor methanol selectivity and yield. Inspired by hard–soft acid–base theory, we proposed that the CO 2 electroreduction pathways towards methanol or methane could be switched by tuning the electron delocalization state of Cu catalytic sites. On the basis of this hypothesis, we have designed and synthesized a cuprous cyanamide (Cu 2 NCN) crystal in which isolated Cu(I) ions strongly conjugated with NCN 2− exhibit highly delocalized electrons. Theoretical calculations showed that Cu 2 NCN substantially reduces the Cu–O interaction of the adsorbed *OCH 3 intermediate so that it is weaker than the O–C interaction at the critical reaction bifurcation point of Cu‒*O‒CH 3 , thus switching the pathway to release *OCH 3 and form methanol. The Cu 2 NCN catalyst exhibits one of the highest recorded CO 2 -to-CH 3 OH selectivities (70%) and an outstanding partial current density of −92.3 mA cm −2 in aqueous electrolyte, corresponding to a CH 3 OH electroproduction rate of 0.160 μmol s −1 cm −2 .
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 8
·3381-3393
·
IF 3.134
Yang Haoguo,Guo Yijun,Han Shitong,Xi Hailing,Lin Huaxiang,Yuan Rusheng,Ding Zhengxin,Long Jinlin,Lin Qun
Mustard gas is a kind of erosive poison with great harm and used as a chemical weapon since World War. It has suggested that the photocatalytic technology is an effective method to eliminate it. Because the small difference in molecular structure between 2-CEES and Mustard gas, and the less toxic of 2-CEES, 2-CEES is often used as a simulator to evaluate the photocatalytic activity of catalysts. In this work, symbiotic mixture of Bi 2 WO 6 and Bi 6 O 6 (OH) 3 (NO 3 ) 3 ·1.5H 2 O nanosheets doped with Mo (Mo-B-B) have been synthesized by a facile hydrothermal treatment. The samples were characterized by XRD, DRS, XPS, SEM, TEM, Raman, and PL. The photocatalytic activity of the samples was evaluated by measuring the degradation of 2-CEES under visible light irradiation. The results showed that the doped Mo reduce the Eg of bare symbiotic mixture and improve the separation efficiency of photo-generated carriers that is beneficial to photocatalytic activity. The optimum amount of doped Mo is 5% that exhibits the best activity for degradation for 2-CEES.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 58
·期 1
·383-396
·
IF 4.682
Luo Lan,Lv Chengkai,Xing Yukun,Ma Fen,Kong Jie,Chen Fangfang
Abstract Molecular imprinting materials can successfully improve the efficacy and safety of drugs, thus showing good potential in the field of drug delivery. However, some difficulties in imprinted materials, such as the deep embedding of imprinting sites and poor accessibility, limit their application. Herein, we have developed porous designed molecularly imprinted polymers (MIPs) based on cleavage hyperbranched polymers for thiamine hydrochloride controlled release. By introducing hyperbranched polymers with terminal double bonds and sensitive disulfide bonds, the resulting porous MIPs (PMIPs) can expose more effective recognition sites and improve the drug-controlled release behavior, where significantly improved the drug loading (101.25 mg g −1 ) compared with the porous non-imprinted polymers (PNIPs, 16.57 mg g −1 ). Moreover, under the optimized conditions of pH 1.7 and 25 °C, the whole drug release time was increased from 16 h (PNIPs) to 32 h (PMIPs). As a result, this porous structure of MIPs designed approach provides an insight to fabricating improved imprinted constituents with higher adsorption capacity and faster recognition kinetics, which not only inspires more brilliant work in the future but also paves the way for the application of MIPs in the field of drug delivery. Graphical abstract
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ARCHIVES OF MICROBIOLOGY
·
2022
·Vol. 205
·期 1
·1-14
·
IF 2.667
Mei Jinfei,Zhao Fengbei,Hou Yumei,Ahmad Sajjad,Cao Yujie,Yang Zheng,Ai Hongqi,Sheng Liangquan
For effective utilization of corncob residue to realize green circular production, using composting to obtain a high-quality and low-cost biomass fertilizer has become a very important transformation avenue. In this paper, two novel phosphorus/potassium-degradation bacterial strains were isolated from tobacco straw and identified as Bacillus aerophilus SD-1/Bacillus altitudinis SD-3 (abbreviated as SD-1/SD-3). These identified two novel bacteria SD-1/SD-3 show that the soluble phosphorus content of SD-1/SD-3 reached 360.89 mg L −1 /403.56 mg L −1 in the shake flask test, and the mass concentration of soluble potassium is 136.56 mg L −1 /139.89 mg L −1 . In addition, the Laccase (Lac), Lignin peroxidase (LiP), and Manganese peroxidase (MnP) activities of SD-1 and SD-3 are 54.45 U L −1 /394.84 U L −1 /222.79 U L −1 and 46.27 U L −1 /395.26 U L −1 /203.98 U L −1 respectively, with the carboxy-methyl cellulase (CMCase) of 72.07 U mL −1 and 52.69 U mL −1 . Meanwhile, the effects of three different combinations of cultures, i.e., no inoculation (K1), inoculation of SD-1/SD-3 on day 21 (K2) and on day 0 (G) are investigated to understand the influence on the degradation degree of corncob residue compost. The results of K2 compost treatment showed that the effective P/K content increased nearly 3.1/2.4 times, the degradation of cellulose/lignin was 49.1/68.0%, and the germination rate was 110.23%, which were higher than other experiment groups K1/G. In conclusion, knowledge of this paper will be very useful for the industrial sector for the treatment of complex corncob residue. Graphical Abstract
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