Materials Today Communications
·
2024
·
IF 3.7
Yudong Xu,Saisai Chen,Mengru Xu,Yaran Wen,Zhenyu Yan,Yuanyuan Yan,Tianyu Zhang,Tong Zhu,Zhixu Qin,Fabao Zhang
A lead-free double perovskite material is being considered as a substitute for lead-based perovskites due to its promising benefits in the photocatalytic degradation of organic dyes. In this study, Cs 2 AgBiCl 6 , a A 2 BB’X 6 -structured halide double perovskite, was prepared by one-step grinding method and hydrochloric acid precipitation method, respectively, and was used to degrade organic dyes in an ethanol solution under visible light. It is shown that the nano-sized Cs 2 AgBiCl 6 sample prepared by the one-step grinding method (Cs 2 AgBiCl 6 -G) can degrade 98 % of Sudan Red III within 10 min, which is highly comparable with the sample prepared using the hydrochloric acid precipitation method (Cs 2 AgBiCl 6 -P). Cyclic experiments demonstrated that Cs 2 AgBiCl 6 -G exhibited superior cyclic catalytic performance compared to the Cs 2 AgBiCl 6 -P samples. In addition, the former also exhibited better photocatalytic degradation for methyl orange, rhodamine B, and methylene blue. This indicates that this facile one-step grinding method can be utilized a large-scale effective preparation technique for producing high yield, eco-friendly, highly efficient and stable Cs 2 AgBiCl 6 photocatalyst.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Ying Xiong,Xinwei Du,Peng Wang,Xiaogeng Feng,Junshuo Cui,Zhenning Lou,Weijun Shan,Haibiao Yu
This work aimed at elucidating the beneficial effect of the solid-phase grinding method on the catalytic performance of K- x Al for catalyzing γ-valerolactone to butene. Research indicated that a part of Al species was successfully introduced into the framework of KIT-6 support without destroying its original ordered mesoporous structure by the solid-phase grinding treatment method. Hence, Lewis and Brønsted acid sites were formed on the surface of the catalyst. By adjusting the amount of Al species, the content of weak acid sites (100-300 °C) on the catalyst surface can reach as much as 0.31 mmol·g −1 . Through the catalytic activity tested, the K-4Al catalyst exhibited optimum catalytic performance. The GVL conversion rate and butene yield can reach 96.2% and 90.1% at 300 °C, respectively. In addition, the K-4Al catalyst also showed satisfactory renewable performance in cycle tests. These findings will provide useful guidelines for further catalyst design for the preparation of butene from γ-valerolactone.
研究领域:
催化化学
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生物质转化
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材料科学
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产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 134
·期 2
·837-849
·
IF 2.081
Zhao Xinhong,Niu Li,Hao Zongyi,Long Xuefeng,Wang Dongliang,Li Guixian
SSZ-13 has been widely used in catalysis and adsorption due to its excellent hydrothermal stability and large specific surface area. It was reported that the long crystallization time was one of the primary challenges limiting its industrial progress. In this paper, we reported a novel solid-state grinding route of synthesizing SSZ-13 zeolite, which was based on interzeolite transformation strategy and promoted by sodium persulfate (Na 2 S 2 O 8 ). The effects of the amount of Na 2 S 2 O 8 and crystallization time on the purity and crystallinity of SSZ-13 zeolite were studied by XRD measurements in detail. The results indicated that the crystallization time could be significantly shortened from 72 to 24 h when the molar ratio of Na 2 S 2 O 8 /SiO 2 was changed from 0 to 0.01, proving that Na 2 S 2 O 8 has the ability of accelerating the crystallization of SSZ-13 as a hydroxyl radical reagent. Three typical SSZ-13 materials and a reference sample were used as the catalysts for methanol-to-olefins reaction (MTO) and their physicochemical properties were analyzed by SEM, N 2 physisorption and NH 3 –TPD techniques. The SEM characterization results showed that the crystal size of SSZ-13 synthesized in the presence of Na 2 S 2 O 8 was larger than that of the one in the absence of it. The NH 3 –TPD results showed that the introduction of Na 2 S 2 O 8 could modulate the acid properties of SSZ-13 zeolites. The MTO tests revealed that the catalytic lifetime of one sample with Na 2 S 2 O 8 promoter (SSZ-13-0.01M-24h) was much longer than that of the other three samples. The observed difference in catalytic stability was mainly attributed to their various concentrations of medium strong acid sites.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 12
·7312-7319
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IF 9.3
Hao-Cheng Wang,Xiao Liu,Jian-Gong Ma,Peng Cheng
Green and economical synthetic approaches for metal–organic frameworks (MOFs) and incorporating multiple functionalities into MOF matrixes are of great interest for wide applications. Herein, we developed a rapid, high-throughput and universal centrifuge tube grinding (CTG) synthetic strategy for the synthesis of a series of popular MOFs in centrifuge tubes. Significantly, a variety of catalytic and optically active organic, biological and complex molecules were incorporated into the in situ formed defects of MOF skeletons by one-pot CTG synthesis to achieve various novel MOF-encapsulated composite materials. Types of MOFs as well as different composites can be rapidly and greenly synthesized simultaneously in centrifuge tubes with different sizes on a single vortex mixer even on a gram scale. Our strategy provides a facile route for the incorporation of multiple functionalities, especially large active molecules, into MOFs and for greenly affording various MOF-based materials towards various applications in diverse areas.
研究领域:
材料科学
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化学工程
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催化与光学材料
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
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2024
·
IF 1.3
Rusi Hao,Wenliang Sun
Lithium iron phosphate (LiFePO 4 , LFP) is a frequently utilized cathode material for lithium-ion batteries. However, its practical applications are constrained by its relatively low ionic and electronic conductivities. To address this issue, it is possible to utilize highly conductive metallic coatings to enhance the material's electronic conductivity. Herein, LiFePO 4 with Cu composites (LFP/Cu) as cathode was synthesized by a simple solid-state process via one-step grinding in the presence of CuNO 3 and ascorbic acid. The discharge capacity of the LFP/Cu cathode with 0.75 wt% Cu was found to be 160.9 mA h g −1 at 0.1 C, representing a close approximation of its theoretical capacity and a notable enhancement compared to pure LFP (145.9 mA h g −1 ). Furthermore, it demonstrates excellent stability with a capacity retention of 136.5 mA h g −1 after 100 cycles at 2 C, as well as good rate performance. The electrochemical impedance spectra demonstrate that the incorporation of copper results in a further reduction in the resistance of LFP/Cu compared to pure LFP. The incorporation of copper particles into lithium iron phosphate has been shown to enhance its electronic conductivity, thereby further enhancing its electrochemical performance. In this study, we present a facile and cost-effective room-temperature synthesis method for the preparation of LiFePO 4 /Cu composites with improved electrochemical properties. This work provides a promising avenue for the design of cathode materials in lithium-ion batteries.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
MOLECULES
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2022
·Vol. 27
·期 3
·741
·
IF 4.927
Zhengqi Dong,Rui Wang,Mingyue Wang,Zheng Meng,Xiaotong Wang,Meihua Han,Yifei Guo,Xiangtao Wang
Naringenin (NRG) is a natural flavonoid compound abundantly present in citrus fruits and has the potential to treat respiratory disorders. However, the clinical therapeutic effect of NRG is limited by its low bioavailability due to poor solubility. To enhance the solubility, naringenin nanosuspensions (NRG-NSps) were prepared by applying tocopherol polyethylene glycol succinate (TPGS) as the nanocarrier via the media-milling method. The particle size, morphology, and drug-loading content of NRG-NSps were examined, and the stability was evaluated by detecting particle size changes in different physiological media. NRG-NSps exhibited a flaky appearance with a mean diameter of 216.9 nm, and the drug-loading content was 66.7%. NRG-NSps exhibited good storage stability and media stability. NRG-NSps presented a sustainable release profile, and the cumulative drug-release rate approached approximately 95% within 7 d. NRG-NSps improved the antitussive effect significantly compared with the original NRG, the cough frequency was decreased from 22 to 15 times, and the cough incubation period was prolonged from 85.3 to 121.6 s. Besides, NRG-NSps also enhanced expectorant effects significantly, and phenol red secretion was increased from 1.02 to 1.45 μg/mL. These results indicate that NRG-NSps could enhance the bioavailability of NRG significantly and possess a potential clinical application.Keywords:naringenin nanosuspension;media-milling method;bioavailability;antitussive effect;expectorant effect
研究领域:
药剂学
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呼吸系统疾病
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药物递送
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2020
·
IF 2.678
Ting Zhang,Chunli Jiang,Rong Luo,Ruijuan Qi,Mengqin Liu,Chunhua Luo,Hechun Lin,Hui Peng
Luminescent (trimethylbromomethyl) ammonium lead tribromide ((TMBM)PbBr 3 ) nanocrystals are synthesized by a green single-step mechano-grinding method in large scale. The photoluminescence quantum yield (PL QY) of the obtained (TMBM)PbBr 3 nanocrystals is 2.61 %. The luminescence of the nanocrystals can be significantly enhanced by introducing water or methanol during the grinding process. The maximum PL QYs of 7.65 % and 4.69 % are obtained for the nanocrystals prepared by the addition of water and methanol, respectively. The emission light of (TMBM)PbBr 3 nanocrystals can be tuned by the doping of chloride ion.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
PETROLEUM CHEMISTRY
·
2022
·Vol. 62
·期 8
·962-971
·
IF 1.258
Hao Zongyi,Niu Li,Long Xuefeng,Li Hongwei,Wang Dongliang,Ji Dong,Zhao Xinhong
Abstract Two different seed crystals (K–CHA and nano-scaled SAPO-34) were used to promote the rapid interzeolite conversion of USY and fumed silica to pure SSZ-13 zeolite phase via a grinding route. The results show that both seeds can shorten the crystallization time of SSZ-13 zeolite to 24h, which is much shorter than the syntheses in the absence of seeds. The phase purity, morphology, textural parameters, elemental compositions and acid properties of two typical H–SSZ-13 samples with seeds were analyzed by XRD, SEM, N 2 physisorption, EDS and NH 3 –TPD techniques in detail, and compared with the sample without seeds and a reference sample. The results indicate that the introduction of seeds can effectively modify the acid properties of H–SSZ-13, especially their medium strong acid sites. The methanol-to-olefins (MTO) reaction was employed as a probe to evaluate the catalytic stability of above four H–SSZ-13 catalysts. The results reveal that the catalytic lifetime of the two catalysts using seeds is much longer than that of the one without seeds and the reference sample H–SSZ-13–RS. It was speculated that the appropriate concentration of medium strong acid sites may play a pivotal role in prolonging their catalytic lifetime. Here our findings may throw light on the rational design of long-lifetime H-SSZ-13 catalysts in the MTO reaction.
研究领域:
化学工程
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催化
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材料科学
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产品关联
DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 21
·4752-4763
·
IF 8.928
Zhiqiang Li,Wei Zhou,Yuan Tang,Xin Tan,Yizhong Zhang,Zikang Geng,Yuchen Guo,Lequan Liu,Tao Yu,Jinhua Ye
Graphical The schottky heterojunction is constructed based on the Fermi energy level difference between the metal phase 1T-WS 2 and Zn 0.5 Cd 0.5 S. Under visible light irradiation, the tight interfacial contact leads to strong electronic interactions and facilitates the transfer of photogenerated carriers from Zn 0.5 Cd 0.5 S to 1T-WS 2 , further enhancing photocatalytic hydrogen production. Due to inefficient charge separation and low surface catalytic conversion efficiencies, cocatalysts are required for achieving photocatalytic hydrogen evolution. Being a noble-metal-free cocatalyst, metallic 1T-WS 2 with excellent conductivity can function for this reaction. Herein, 1T-WS 2 /Zn 0.5 Cd 0.5 S is constructed via a simple and feasible grinding approach. The composite containing 7.5 % 1T-WS 2 in 1T-WS 2 /Zn 0.5 Cd 0.5 S achieves a hydrogen evolution rate of 61.65 mmol g −1 h −1 and an external quantum efficiency of 8.04 % at 420 nm, which is 37 times that of bare Zn 0.5 Cd 0.5 S (1.67 mmol g −1 h −1 ). The electrical conductivity of metallic 1T-WS 2 reduces the transfer impedance at the interface and thus accelerates the non-radiative energy transfer and electron transport rate. The different Fermi levels of 1T-WS 2 and Zn 0.5 Cd 0.5 S form a Schottky junction, which promotes the transfer of photogenerated electrons from Zn 0.5 Cd 0.5 S to 1T-WS 2 . More importantly, the close interface contact between 1T-WS 2 and Zn 0.5 Cd 0.5 S results in strong electron interactions, which is conducive to the spatial separation of photogenerated electrons and holes. This work will further expand the application of 1T-WS 2 in the photocatalytic hydrogen evolution process.
研究领域:
材料科学
·
催化
·
光催化
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）