SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yu Zhang,Yuran Li,Yuting Lin,Xingfei Song,Fabing Su,Tingyu Zhu
To improve the activity of COS hydrolysis catalysts in a complex atmosphere is a significant challenge for blast furnace gas purification. Alumina-based hydrolysis catalysts were prepared with four alkali/alkaline earth metals (Na, K, Mg and Ca) respectively by the simple impregnation method to explore the chlorine-resistance mechanism of catalysts. Among four catalysts, Na/Al 2 O 3 and K/Al 2 O 3 catalysts showed a higher hydrolysis conversion of COS reaching 98 % for 12 h in the absence of HCl, due to the higher contents of weak basic sites as active sites for COS adsorption and more migratory oxygen species participating in COS hydrolysis. Especially, K/Al 2 O 3 has the highest catalytic activity in that it is easy to adsorb COS and H 2 O due to their high absolute adsorption energy. The presence of HCl inhibits the hydrolysis of COS owing to the acidification of active components and competitive adsorption with COS and H 2 O. It has been further found that HCl also inhibits the migration of oxygen species and deposition of sulfur species, but HCl still has a stronger inhibitory effect on COS hydrolysis than the deposition of sulfur species. The introduction of alkali metal as sacrificial sites protects the structure of alumina-based catalysts, avoiding the combination of HCl and Al-O to generate Al-Cl. Na/Al 2 O 3 has the best Cl-resistance mainly due to the high content of medium basic sites and great bond energy of Na-O with HCl. This research offers valuable guidance for the rational design and preparation of alumina-based catalysts with a good Cl-resistance and for the applications of blast furnace gas purification.
研究领域:
化学工程
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环境科学
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 8
·5118-5129
·
IF 4.682
Lu Shuangxing,Luo Wenbin,Chao Zisheng,Liu Yanhui,Han Shenghua,Fan Jincheng
Two-dimensional tungsten disulfide (WS 2 ) is a promising anode material for lithium-ion batteries. The further development of WS 2 is restricted by the defects of electrical conductivity and structural stability. Here, a bimetallic sulfide/carbon composite WS 2-X /CoS@C was prepared by a facile one-step MOFs-engaged method. The WS 2 /CoS heterojunctions and sulfur vacancies were introduced into the material, which improved the electronic/ionic diffusion kinetics of the composite. A large number of honeycomb carbon nanotubes were formed on the surface of the composite, which could effectively increase the specific surface area and enhance the conductivity of the composite. The WS 2-X /CoS@C electrode exhibited excellent electrochemical performance used as an anode for lithium-ion battery. The initial discharge capacity of the WS 2-X /CoS@C delivered 936 mAh/g at 100 mA/g and retained high discharge capacity of 600 mAh/g at 200 mA/g after the 100 cycles. Graphical abstract
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiaoyan Wang,Ying Xie,Zhicheng Cai,Ni Xiong,Zhikun Xu,Mingxia Li,Qingmao Feng,Wei Zhou,Kai Pan
In this work, the sesame ball-like CoS/MoS 2 nanospheres were controllably synthesized via a facile hydrothermal and solvothermal consecutive reaction. MoS 2 nanospheres were preferentially formed by assembly of nanosheets during the hydrothermal reaction . And then CoS nanoparticles were grown on the surface of MoS 2 nanosheets during the solvothermal reaction method. Due to the space confinement effect, CoS grew as nanoparticles with size of 5 nm between MoS 2 nanosheets, and the nanosheets assembled into nanospheres to get the sesame ball-like structure. Because this composite possessed two merits, that is, more active sites of CoS nanoparticles and high conductivity of MoS 2 nanospheres, DSSCs based on this sesame ball-like CoS/MoS 2 nanospheres got a higher power conversion efficiency of 7.48%, which was higher than that based on the solo CoS (7.10%) and solo MoS 2 (4.84%). And it was similarly to the DSSCs based on Pt cathode (7.51%). Their excellent electrocatalytic activities for the I 3 − /I − redox reaction was confirmed by cyclic voltammetry , electrochemical impedance spectra and Tafel polarization measurements. Density functional theory was also used to calculate the adsorption of I 3 − on the surface of CoS/MoS 2 , and the adsorption energy and bond length results indicated Co atoms were the main catalytic active site for I 3 − reduction. The hybrid interactions took place between p orbital of I and 3d states of Co, which lead to I 3 − was activated and dissociated easily.
研究领域:
材料科学
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能源科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiang Li,Xueqian Wang,Li Yuan,Langlang Wang,Yixing Ma,You Wu,Yibing Xie,Rui Cao,Yiran Xiong,Ping Ning
The lengthy processes and cumbersome operations for the separate removal of COS and H 2 S have severely limited the development of blast furnace gas recycling process. CuO exhibits excellent H 2 S oxidation performance, but weak COS hydrolysis performance; in contrast, ZrO 2 shows the opposite trend. However, the functional combination of CuO and ZrO 2 has never been used for simultaneous removal of COS and H 2 S. In this study, a Cu/Zr co-doped K@TiO 2 bifunctional catalyst was tailored to simultaneously remove COS and H 2 S. The combined COS and H 2 S capacity of this catalyst reaches 340.5 mg/g at a low temperature of 60 °C, which is much higher than those of other reported bifunctional catalysts. The microcrystal structure formed by Cu/Zr co-doping increases the specific surface area of the catalyst and promotes the adsorption of COS/H 2 S. Specifically, Zr doping increases the content of moderate basic sites and significantly improves the hydrolysis efficiency of COS. Moreover, Cu doping induces lattice distortion of TiO 2 , while CuO captures 4 s valence electrons of K to form Cu 2 O. These two processes lead to the release of lattice oxygen from TiO 2 and CuO, generating oxygen vacancies and ·O 2 − , which promotes H 2 S oxidation. By proposing a simple route for the bifunctionalization of a desulfurization catalyst, this study drives innovation in both the theory and application of simultaneous removal of COS and H 2 S.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 9
·1666
·
IF 4.324
Hui Liu,Ling Li,Guangzhen Cui,Xinxin Wang,Zhi Zhang,Xuliang Lv
As a typical two-dimensional material, MXene possesses excellent conductivity and tunable interlayer space, which makes it have an impressive development potential in the field of electromagnetic (EM) waves absorbing materials. In this work, we fabricated a sandwich structure CoS@Ti3C2Txcomposite using a simple solvothermal process. The CoS nanoparticles are anchored on the Ti3C2TxMXene sheets, forming a heterolayered structure. The results demonstrate that the CoS@Ti3C2Txcomposites with the sandwich-like architecture showed excellent EM absorbing performance due to the synergistic effects of the conductivity loss, interface polarization, and dipole polarization. When the doping ratio was 40 wt %, the maximum reflection loss value of CoS@Ti3C2Txwas up to –59.2 dB at 14.6 GHz, and the corresponding effective absorption bandwidth (below –10 dB) reached 5.0 GHz when the thickness was only 2.0 mm. This work endows a new candidate for the design of MXene-based absorption materials with optimal performance.Keywords:MXene Ti3C2Tx;CoS nanoparticle;dielectric loss;microwave absorption
研究领域:
材料科学
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电磁材料
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Wenqing Lu,Ye Song,Meiling Dou,Jing Ji,Feng Wang
A hierarchically porous MoS 2 on Ni 3 S 2 nanorod array on Ni foam (MoS 2 /Ni 3 S 2 /NF) was firstly fabricated through a simple microwave-assisted hydrothermal method , and then followed by electrochemical deposition approach in which MoS 2 /Ni 3 S 2 /Ni foam is decorated with CoS (CoS MoS 2 /Ni 3 S 2 /NF). In contrast to conventional hydrothermal approach, microwave irradiation accelerates the synthesis of MoS 2 /Ni 3 S 2 /Ni foam from time of >20 h–2 h. The characterization of CoS MoS 2 /Ni 3 S 2 /NF by scanning electron microscope (SEM) and high resolution transmission electron microscope (HRTEM) indicate that a whole scale of 1D the Ni 3 S 2 nanorods were hierarchically integrated with MoS 2 and CoS nanosheets . The as-synthesized CoS MoS 2 /Ni 3 S 2 /NF hybrid not only endows the ease transport of electrons along Ni 3 S 2 nanorods to Ni foam, but also accommodates maximal exposure of active edge sites to the reactants through hierarchically porous CoS doped MoS 2 nanosheets , accomplishing the promoted kinetics and activity for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). By electrochemical measurements such as linear sweep voltammetry (LSV) and electrochemical impedance spectroscope (EIS), we find that the CoS MoS 2 /Ni 3 S 2 /NF hybrid shows markedly enhanced electrochemical performance for both HER and OER. Specifically, the optimal CoS MoS 2 /Ni 3 S 2 /NF 8C possesses the low overpotentials (η 10 ) of 85 and 225 mV at current density (|j|) of 10 mA cm −2 in 1.0 M KOH and the small 62.3 and 46.1 mV dec −1 Tafel slope for HER and OER, respectively, outperforming those of most of the current noble metal-free electrocatalysts . These results highlight the fact that CoS MoS 2 /Ni 3 S 2 /NF is a high-performance, noble-metal-free electro-catalyst, and provide a potential avenue toward achieving an enhanced electrocatalytic activity towards both in HER and OER. Yet the duration of the as prepared catalyst in OER still need to be improved.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 3
·964-977
·
IF 3.5
Zhu Q.,Wei S.,Wang C.,Yang X. B.,Zhou B.,Xie Z. X.,Duan Z. Q.,Hu Y. M.
Unique wool-ball shaped nanocrystalline CoS was synthesized using solvothermal method in which dopamine (DA) was added as carbon source to combine with the CoS. The DA in situ polymerized and coated on the CoS particle surfaces during the solvothermal process. N, S co-doped carbon-encapsulated CoS(Co 9 S 8 ) were achieved after a post carbonization. In the composites, CoS(Co 9 S 8 ) nanocrystals and carbon are tightly bound and embedded into the amorphous carbon layer to form a spherical core–shell structure. Hybrid counter electrodes (CEs) fabricated with the product have good conductivity, dispersion and stability due to the synergetic effect between carbon and nanocrystalline CoS(Co 9 S 8 ). Charge transfer through the CE/electrolyte interfaces is improved by dopamine-carbon combination. In the optimal case, PCE of 8.82% of the dye-sensitized solar cells (DSSCs) with the hybrid CEs was achieved, which is close to that of the cell with Pt (8.86%) CE, and is a 41.12% increase compared with that of CoS CE cell with the structure of photoanode/N719/electrolyte (I − /I 3 − )/CE. Moreover, stability of the cells with the composite CEs was greatly improved. The results demonstrate that the as-prepared composites are promising alternatives to Pt-CEs for high-performance DSSCs. The reported preparation method will guide further developments in highly efficient carbon-based catalysts for electrochemistry and energy related applications.
研究领域:
材料科学
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能源技术
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电化学
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纳米技术
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太阳能电池
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Liyuan Wu,Pengpeng Guo,Xin Wang,Haiyan Li,Xiaoran Zhang,Kaiyu Chen,Peng Zhou
The incorporation of heterostructure and vacancies will bring new strategies to improve the intrinsic activity of catalysts. Herein, the CoS@FeS heterostructure catalyst with sulfur vacancies (SVs) was fabricated by a simple hydrothermal strategy, which can synergistically trigger peroxymonosulfate (PMS) activation toward the efficient degradation of sulfamethoxazole (SMX) ( k obs , 0.3334 min −1 ) through a non-radical/radical oxidized pathway. SO 4 • – , •OH and 1 O 2 were regarded as the main reactive oxygen species (ROSs). Mechanism studies revealed that the synergy of SVs and heterostructure played an electron density adjusting role for the PMS activation into SO 4 • – and •OH, as well as the continuous generation of •O 2 − from O 2 , thereby in favor of 1 O 2 . The SVs availed the adsorption of PMS and dissolved oxygen (DO) on the surface, the continuous electron transmission would be consolidated through the charge transfer efficiency (CTE) of heterostructure. Meanwhile, the integration of SVs with heterostructure reduced the adsorption energy of PMS (-3.82 eV) on the interface of the catalyst according to the density functional theory (DFT) calculations, which overcame the repulsion effect between negatively charged HSO 5 – and CoS@FeS, and enhanced the charge transfer efficiency to accelerate the PMS activation for generating SO 4 • – and •OH. This work will propose a new approach for synergistically stimulating the intrinsic activity of catalysts to improve environmental remediation.
研究领域:
环境科学
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Ocean University of China
·
2022
·Vol. 21
·期 3
·782-788
·
IF 1.179
Zhang Pengpeng,Zhang Miaomiao,Dong Kaiyu,Zhang Yicong,Yang Shuang,Wang Yuanhong,Jiang Tingfu,Yu Mingming,Lv Zhihua
Chito-oligosaccharide (COS) had shown a variety of biological activities and potential biomedical implications. The present study investigated the pharmacokinetics, bioavailability, and in vitro absorption of COS with degrees of polymerization (DPs) 2–7 and explored the influence of DPs on them. From Caco-2 cell permeation studies, COS were low permeability compounds with no directional effects, suggesting a low in vivo absorption mediated by facilitation diffusion and paracellular absorption. After an intragastrical administration to rats, COS2 showed the highest systemic exposure in six oligosaccharides. The bioavailability of COS2–7 was 7.33%, 6.11%, 4.67%, 4.13%, 4.02%, 0.99%, respectively. Differences in bioavailability for each COS correlated to structural variations, with high DPs contributing to a decrease in bioavailability. In conclusion, COS could be absorbed by the intestinal tract both in vitro and in vivo . The very low oral bioavailability of COS could be due to low permeability. DPs can affect absorption and bioavailability of COS2–7. This study provided evidence for the absorption characteristics of COS2–7 to help us better understanding the pharmacological actions.
研究领域:
药理学
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生物医学科学
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药学
✓ 已验证
产品关联
DOI
高影响因子
Food & Function
·
2024
·
IF 5.1
Xuening Yu,Guang Li,Shuling Zhou,Xiaoyang Liu,Fawen Yin,Deyang Li,Dayong Zhou
Zinc is essential for maintaining the integrity and repair of small intestinal epithelial cells while zinc deficiency could induce the inflammatory infiltration and imbalance of intestinal flora in the intestine. In this study, glycosylation between oyster protein hydrolysate (OPH) and chitosan oligosaccharide (COS) was conducted and used as the carrier of zinc ions (OCZn). The results of zeta potential and particle size distribution showed that the OPH-COS successfully bound to zinc ions to form OCZn with a surface zinc content of 0.56% (scanning electron microscopy). In addition, OCZn was found to exhibit good intestinal digestion by in vitro simulated digestion microscopy, while TSQ fluorescence staining revealed the presence of free zinc ions released from OCZn in the intestinal cells. In the zinc deficiency-induced mouse model, a moderate dose of OCZn (zinc: 6.96 mg kg−1) showed significant restorative effects on colonic inflammation (IL-1β: 28.20 pg per mg·protein, IL-6: 27.73 pg per mg·protein), protein expressions of HO-1 and ZO-1, oxidative stress (the liver and kidneys), and imbalance of the gut microbiota, increasing microbial diversity and abundance (ratio of Firmicutes/Bacteroides). Zinc deficiency triggered the abundance of Proteobacteria (risk of diseases), while the dominant bacteria were mainly restored to Bacteroides, Parabacteroides, Alistipes, Alloprevotella, and Muribaculaceae following the administration of OCZn. This study provided a theoretical basis for improving the inflammatory infiltration of the colon and the imbalance of intestinal flora caused by zinc deficiency.
研究领域:
营养学
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微生物学
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免疫学
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胃肠病学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULAR PHARMACEUTICS
·
2020
·
IF 4.321
Lan Cui,Xiayi Feng,Wentao Liu,Hao Liu,Qian Qin,Shuangxia Wu,Suqin He,Xinchang Pang,Dong Men,Chengshen Zhu
The surface charge of nanocarriers inevitably affects drug delivery efficiency; however, the cancer cell specificity, anti-inflammatory effects, and charge-reversal points remain to be further addressed in biomedical applications. The aim of this study was to comprehensively assess the cancer cell specificity of DOX-loaded mesoporous silica-chitosan oligosaccharide-carboxymethyl chitosan nanoparticles (DOX@MSNs-COS-CMC) in MCF-7 and HeLa cells, inhibit the production of inflammatory cytokines, and improve the drug accumulation in the tumor site. Intracellular results reveal that the retention time prolonged to 48 h in both HeLa and MCF-7 cells at pH 7.4. However, DOX@MSNs-COS-CMC exhibited a cell type-dependent cytotoxicity and enhanced intracellular uptake in HeLa cells at pH 6.5, due to the clathrin-mediated endocytosis and macropinocytosis in HeLa cells in comparison with the vesicular transport in MCF-7 cells. Moreover, Pearson’s correlation coefficient value significantly decreased to 0.25 after 8 h, prompting endosomal escape and drug delivery into the HeLa nucleus. After the treatment of MSNs-COS-CMC at 200 μg/mL, the inflammatory cytokines IL-6 and TNF-α level decreased by 70% and 80%, respectively. Tumor inhibition of DOX@MSNs-COS-CMC was 0.4 times higher than free DOX, alleviating cardiotoxicity and inflammation in the HeLa xenograft tumor model. Charge-reversible DOX@MSNs-COS-CMC could be a possible candidate for clinical therapy of cervical carcinoma.
研究领域:
药理学
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肿瘤学
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生物医学工程
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jixu Zhang,Liang Mao,Aihua Yan,Fei Huang,Nan Li,Zigao Su,Huaqi Yuan,Bolei Hui,Heng Wang
The sluggish charge-carrier kinetics for conventional photocatalysts severely limit the photogenerated charge utilization and result in unfavorable hydrogen evolution efficiency. To address these challenges, CoS/S v -ZnIn 2 S 4 /Ni(OH) 2 photocatalysts, containing sulfur vacancy, p-n-type heterojunction and Ohmic contact, were successfully constructed via an in-situ technique. Defect-mediated enrichment of photogenerated electrons at sulfur vacancies achieved fast charge transfer and inhibited the carrier recombination. The interfacial electric field (IEF) due to p-n-type heterojunction enhanced the carrier separation and transfer. Ohmic contact rapidly extracted the photogenerated charges and accelerated the hydrogen reduction reaction dynamics. As expected, CoS/S v -ZnIn 2 S 4 /Ni(OH) 2 catalysts reached an impressive hydrogen evolution rate of 19.45 mmol g −1 h −1 , which was 8.61 times higher than that of pure ZIS. This work demonstrates that the synergistic effect between sulfur vacancies and IEF effects may establish a new paradigm for designing high-efficiency multi-component sulfide-based photocatalysts.
研究领域:
材料科学
·
催化
·
纳米技术
·
物理化学
·
能量转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）