Catalysis Science & Technology
·
2018
·Vol. 8
·期 19
·4934-4944
·
IF 5.365
Jinghua Liu,Tong Ding,Hao Zhang,Guangcheng Li,Jinmeng Cai,Dongyue Zhao,Ye Tian,Hui Xian,Xueqin Bai,Xingang Li
Herein, we report the high performance of thermally reduced Pt/TiO2(B) catalysts for the catalytic oxidation of CO. Our findings show that through hydrogen spillover from Pt to TiO2, surface-engineered defects of oxygen vacancies are “constructed” on the TiO2 support during the reduction process, thus generating active surface-adsorbed oxygen species. With an increase of the reduction temperature, the TiO2(B) phase gradually transforms to the anatase phase, which takes place from the bulk to the surface of TiO2, and is eventually completed at 700 °C. Compared with the anatase phase, the oxygen vacancies are more easily formed on the TiO2(B) phase, and the latter has much stronger interactions with Pt, as well. As the reduction temperature increases, the metal–support interaction between Pt and TiO2(B) is strengthened. Meanwhile, we simultaneously observe an increase in the dispersion of Pt, the proportion of Pt0 and the adsorbed oxygen species on the surface. Our findings reveal that for thermally reduced Pt/TiO2 catalysts, surface-adsorbed oxygen and Pt0 are active species for the catalytic oxidation of CO. Among the thermally reduced catalysts, H-600 shows the highest catalytic activity because it has the largest amount of active Pt0 sites and surface-adsorbed oxygen species. In addition, it shows high water vapor resistance.
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APPLIED CLAY SCIENCE
·
2025
·
IF 5.8
Yan Zhang,Xinhui Huang,Yaxue Zhang,Letian Lv,Chengyuan Su,Shu Gao,Zhi Huang,Menglin Chen,Xianfeng Lin
We prepare CdS-CeO 2 /sepiolite materials in a one-step process and characterize their structural, morphological, and optical properties. CdS-CeO 2 /sepiolite displays enhanced adsorption of the environmentally hazardous dye Rhodamine B (RhB), up to 34.92 mg/g. Harnessing synergy between adsorption and photocatalysis, CdS-CeO 2 /sepiolite removes 98.57 % of RhB from solution after 150 min of visible light illumination and is robust to a wide pH range. Quenching experiments and electron spin resonance (ESR) indicates that singlet oxygen and holes are the main reactive groups during photocatalytic degradation. CdS and CeO 2 hinder the recombination of photogenerated electron-hole pairs, accelerate charge transfer, and enhance visible light absorption. These CdS-CeO 2 /sepiolite materials have potential application in the efficient photodegradation of dye in a wide range of pH.
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ChemPhotoChem
·
2025
·
IF 3
Mengrong Zhang,Sha Ni,Zichao Yang,Min Zhang,Zhongjie Guan,Jianjun Yang
Graphical Cu-modified monoclinic TiO 2 nanoflowers with OVs (Cu 1 TB-1.5) promote the reactivity and selectivity of CO 2 reduction to CO under visible light. CO selectivity is 99.6%, and the cycling stability is excellent. The Cu 1 TB-1.5 facilitates the formation of the intermediate COOH* during the photocatalytic process, thus improving the yield and selectivity of CO. The photoreduction of CO 2 has attracted extensive attention as a promising solution to global warming. In this study, Cu-modified TiO 2 (B) (CuTB) nanoflowers with oxygen vacancies (OVs) are designed and synthesized via hydrothermal treatment and photodeposition to promote the reactivity and selectivity of CO 2 reduction to CO under visible light. The CO and CH 4 yields of sample Cu 1 TB-1.5 under visible light are 5.72 and 0.02 μmol g −1 h −1 , wherein the CO yield was 15.5 times that of sample TB; its selectivity is 99.6%, and the cycling stability is excellent. OVs can broaden the light absorption of TB to the visible light region, and Cu promotes photoinduced electron transfer from TB to the Cu species and act as an active center. The OVs and Cu can synergistically enhance charge separation, CO 2 adsorption, and CO 2 conversion. The Cu 1 TB-1.5 facilitates the formation of the intermediate COOH* during the photocatalytic process, thus improving the yield and selectivity of CO. This research provides a unique idea for the development of novel highly selective photocatalysts.
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NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 36
·15652-15663
·
IF 2.5
Wei Dong,Zhaomeng Wu,Xiaochen Xu,Su Li,Yang Ji
Lithium–sulfur (Li–S) batteries are regarded as one of the best choices for next-generation batteries due to their high energy density and low cost. However, there are three major challenges, namely the low electrical conductivity of sulfur and its products, the volume change during the electrochemical process, and the “shuttle effect” of lithium polysulfide. Carbon materials can alleviate the problems of electrical conductivity and volume change of sulfur. The shuttle of polysulfides can be further inhibited by doping heteroatoms or loading polar compounds. In this work, CoS2/porous boron–nitrogen co-doped carbon (CoS2/BNC) was prepared using a boron–nitrogen co-doped porous carbon precursor. The hollow structure can better adapt to the volume expansion during the sulfur reaction, and the chemisorption and redox kinetics of LiPSs are strengthened from multiple angles to inhibit the shuttle of LiPSs. The CoS2/BNC/S lithium–sulfur battery has a high initial discharge capacity of 1639.1 mAh g−1 under the condition of 0.1C. After 500 cycles at a current density of 2C, the capacity still remains at 752.7 mAh g−1, with a capacity decay of only 0.048% per cycle, and the coulombic efficiency can still be maintained at 97.8%, showing satisfactory electrochemical performance.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Lei Zhang,Yong Shi,Qinyu Xu,Jingbo Yu,Qingya Li,Lirong Huang,Xinxin Kang,Shujun Wang,Jie Qiao
Although a protective shell based on a metal-organic framework (MOF) can effectively improve the remediation of polycyclic aromatic hydrocarbons (PAHs) by microorganisms, the functional characteristics of the shell are often limited by the surface charge, chemical properties and intrinsic strain characteristics. This study explored the potential of mixed organic acids (MA) as an eco-friendly modifier for zeolite imidazolate framework-8 (ZIF-8), facilitating the formation of a biomimetic mineralized shell around Bacillus subtilis ZL09-26. The addition of MA into the ZIF-8 protective shell was found to stimulate growth and bolster cell viability. Notably, adding MA contribute resulted in a 1.98- fold enhancement of the PHE degradation efficiency. After five cycles of reuse, ZIF-8-MA@ B. subtilis ZL09-26 still maintained almost 90 % of the initial PHE degradation ability. Proteomic analysis revealed a coordinated regulation of multiple metabolic pathways that facilitated PHE uptake and degradation, including central carbon metabolism, direct PHE biodegradation, oxidative phosphorylation, aminoacyl-tRNA biosynthesis, fatty acid biosynthesis, ABC transporters, and the biosynthesis of valine, leucine, isoleucine, and lysine. This work broadens the application potential of biomineralized microorganisms, providing novel strategies for the sustainable bioremediation of xenobiotic pollutants in the environment.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yuan Li,Yong Xia,Xinxin Li,Xin Zhou,Dongmei Li,Wei Zhang,Zhiqiang Guo
Dye sensitization has emerged as a promising strategy to enhance the visible-light photocatalytic performance of TiO 2 . However, conventional dye-sensitized photocatalytic systems face significant challenges, such as limited light absorption efficiency and secondary pollution caused by dye desorption and degradation. Herein, pure TiO 2 hollow nanospheres are prepared, and their size is regulated to excite Mie resonance, thereby enhancing the self-sensitized photocatalytic degradation of Rhodamine B (RhB) under visible light without the need for external sensitizers. By optimizing the diameter of the TiO 2 hollow nanospheres to approximately 370 nm (D370), we achieve a strong overlap between the Mie resonance wavelength and the absorption band of RhB. Under visible-light irradiation, D370 exhibits exceptional photocatalytic performance, achieving 94.3% degradation of RhB within 60 min and a reaction rate constant of 46.91×10 -3 min -1 , which significantly outperforms conventional TiO 2 nanoparticles. Using finite element method (FEM) simulations and multipole decomposition method, we reveal that the enhanced performance is driven by size-dependent Mie resonances, predominantly magnetic quadrupole resonances. These resonances localize and amplify the incident light field on and around the spherical shells, leading to a more than 4-fold enhancement in the electric field intensity and a substantial increase in RhB absorption. This work demonstrates the remarkable potential of pure TiO 2 materials for visible-light-induced photocatalytic degradation, achieving high efficiency without additional modification. Furthermore, it highlights the critical role of Mie resonance, particularly magnetic multipole contributions, in enhancing light utilization efficiency. These findings not only advance our understanding of light-matter interactions in photocatalytic systems but also provide a novel framework for designing high-performance photocatalysts, paving the way for broader applications in solar energy conversion and environmental remediation.
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BIOSENSORS & BIOELECTRONICS
·
2024
·
IF 10.7
Jingwei Chen,Tingting Liu,Yule Zhang,Mengnan Duan,Zhijin Yang,Mengya Chen,Yiran Wang,Lulu Zheng,Songlin Zhuang,Dawei Zhang
Home testing technology strategy is critical for early screening of disease. However, current home testing technologies often require complex processes, which limits their application. In this study, a time-resolved cascade logic gate microfluidic chip (TCLMC) was revealed to enable capillary force-based one-step operation without manual intervention or professional equipment. By analogy with logic gates in the circuit, TCLMC could automatically control the fluid flow and regulate the incubation time to optimize the immunoassay . The limit of detection of TCLMC for SARS-CoV-2 and influenza B virus (Flu B) was 134.94 and 79.17 pg mL −1 within 10 min. Additionally, this study tested saliva samples from 12 Flu B patients and 24 healthy controls to verify its clinical application. The results showed that TCLMC had high sensitivity (100%), specificity (100%), and accuracy (100%). This study provides a new one-step strategy for home testing and demonstrates its great potential in the diagnosis field.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Yuan-Bin Chen,Ling Tang,Xiuyuan Su
Low-temperature sintered microwave dielectric ceramics are gaining increasing attention for next-generation wireless communication systems, particularly within the 6 G frequency range. However, materials that simultaneously exhibit ultra-low dielectric loss and low sintering temperatures remain scarce. In this study, Nd 2 [Zr 1-X (Bi 0.5 Ta 0.5 ) X ] 3 (MoO 4 ) 9 ceramics were prepared via a conventional solid-state reaction method and exhibited a single-phase structure with a trigonal symmetry (space group R 3 ¯ C, No. 167). The optimal sample at x = 0.11 sintered at 750 ℃ showed excellent performance: ε r = 11.4, Q×f = 186,300 ± 8900 GHz, and τ f = –42.9 ppm/℃. The elevated Q×f value is chiefly ascribed to increased lattice energy, with its variation more plausibly arising from intrinsic effects within the material. The dielectric constant (εᵣ), analyzed using the Clausius–Mosotti equation, was predominantly influenced by ionic polarizability. According to P–V–L theory, the effective bond strength f iNd–O played a major role in determining εᵣ, while τ f was governed by the bond energy and thermal expansion behavior of Mo–O bonds. Raman spectroscopy further confirmed the structure–property relationships. These results suggest that B-site substitution with (Bi 0.5 Ta 0.5 ) 4+ not only promotes densification and increases lattice energy, but also maintains thermal stability, thereby enhancing Q×f without compromising τ f . This system offers strong potential for integration into future microwave dielectric components.
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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2013
·
IF 3.499
Dacheng Fan,Weizhi Sun,Peiju Qiu,Zhiyong Wu,Yantuan Li,Shengbiao Wan,Tao Jiang,Lijuan Zhang
We synthesized a series of novel 3-indolyl cyclopent[ b ]indoles by trifluoroacetic acid mediated cyclodimerizations . The reaction showed high stereoselectivity and moderate to good yields. The influencing factors for stereoselectivity were systematically analyzed and a stepwise reaction mechanism was proposed. The cell viability tests in two colon and two lung cancer cell lines indicated the 1-benzyl-2-phenyl-group in 3-indolyl cyclopent[ b ]indoles was critical for the observed lower IC 50 s in these compounds. Western blot analysis demonstrated that the compound inhibited the expression and phosphorylation of EGFR through altered HSP90 expression. Further cell cycle and cell cycle check point protein analyses showed expected anti-cellular proliferation and cell cycle arresting properties associated with suppressed EGFR expression and phosphorylation. These data revealed a novel molecular mechanism explaining the observed cytotoxicities for these compounds.
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CNS Neuroscience & Therapeutics
·
2021
·Vol. 28
·期 1
·116-125
·
IF 5.243
Jian-wei Ge,Shi-ji Deng,Zhi-wei Xue,Pin-yi Liu,Lin-jie Yu,Jiang-nan Li,Sheng-nan Xia,Yue Gu,Xin-yu Bao,Zhen Lan,Yun Xu,Xiao-lei Zhu
Aims Microglia-mediated neuroinflammation plays an important role in the pathological process of ischemic stroke, and the effect of imperatorin on post-stroke neuroinflammation is not fully understood. Methods Primary microglia were treated with imperatorin for 2 h followed by LPS (100 ng/ml) for 24 h. The expression of inflammatory cytokines was detected by RT-PCR, ELISA, and Western blot. The activation of MAPK and NF-κB signaling pathways were analyzed by Western blot. The ischemic insult was determined using a transient middle cerebral artery occlusion (tMCAO) model in C57BL/6J mice. Behavior tests were used to assess the neurological deficits of MCAO mice. TTC staining was applied to measure infract volume. Results Imperatorin suppressed LPS-induced activation of microglia and pro-inflammatory cytokines release and attenuated ischemic injury in MCAO mice. The results of transcriptome sequencing and Western blot revealed that downregulation of MAPK and NF-κB pathways might contribute to the protective effects of imperatorin. Conclusions Imperatorin downregulated MAPK and NF-κB signaling pathways and exerted anti-inflammatory effects in ischemic stroke, which indicated that imperatorin might be a potential compound for the treatment of stroke.
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Evidence-based Complementary and Alternative Medicine
·
2022
·
IF 2.65
Haijun Gao,Yan Zhang,Xiaojin Mo,Lele Huo,Yanping Luo,Ting Zhang,Xingming Ma,Wei Hu,Tao Jing
Background. Liver cancer, particularly hepatocellular carcinoma (HCC), is the fourth leading cause of cancer-related death worldwide. Sorafenib is a crucial drug for the treatment of advanced HCC, but it is difficult to meet the challenge of increasing clinical demands due to its severe side effects and drug resistance. Hence, development of novel antitumor drugs is urged. Previous studies showed that pseudolaric acid B (PAB) could reduce the expression of protein kinase B (PKB/Akt), a downstream effector of Notch signaling, facilitating cell apoptosis in HCC. The disruption of Notch signaling was verified to exacerbate malignant progression and drug resistance, however, the antitumor effect of PAB on Notch signaling in HCC remains unclear. Thus, this study aims to investigate the anti-HCC effect of PAB in association with the regulation of Notch1/Akt signaling. Methods. CCK-8 assay and transwell assay were used to examine the cell proliferation and invasion in Huh7 cells after treatment with PAB and a Notch inhibitor DAPT. Moreover, the cell cycle of Huh7 cells after treatment with PAB was analyzed using flow cytometry. Finally, the changes of Notch1, Jagged1, Hes1, and Akt expression at the protein and mRNA level in Notch1/Akt signaling in Huh7 cells after treatment with PAB and DAPT were analyzed using immunofluorescence assay and real-time qPCR. Results. The proliferation rate of Huh7 cells exposed to PAB of 0.5, 1, 2, 4, 8, 10, 20, 40, 80, 100, and 200 μmol/L revealed a time-and dose-dependent decrease in vitro, showing cell cycle arrest at G2/M phase . Furthermore, compared with the untreated group, at the concentration of 40 μmol/L, the proliferation rate and invasion rate of Huh7 cells in PAB, DAPT, and PAB-DAPT combination (PAB + DAPT) group were significantly decreased , but the PAB + DAPT showed no synergistic antiproliferation and anti-invasion effect in comparison with PAB treatment alone . In addition, compared with the untreated group, PAB and DAPT alone significantly downregulated the expression of Notch1, Jagged1, Hes1, Akt mRNA, or/and protein in Huh7 cells , but there was no significant difference in synergistic downregulated effect between the PAB + DAPT group and the PAB group . Conclusion. PAB can suppress proliferation and invasion of HCC cells through downregulating the expression of Notch1/Akt signaling protein and mRNA, and may be a potential novel antitumor drug candidate for the clinical treatment of HCC in the future.
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INORGANICA CHIMICA ACTA
·
2025
·
IF 3.2
Xiaoyu Qiu,Zhimei Li,Jianmei Cen,Hong Tang
Transition metal-based materials have emerged as a promising catalyst for peroxymonosulfate (PMS) activation in pollutant removal. However, challenges such as nano-material agglomeration, high metal ion leaching, and low reactive oxygen species (ROS) yield still hinder their practical application. In this work, the CoP/NF successfully was synthesized to tune PMS activation from a radical pathway to a non-radical dominated pathway for efficient degradation of organic pollutants. The incorporation of phosphorus element modulated the cobalt-based catalyst surface charge state and induced local charge density, facilitating the catalytic activity. Consequently, at optimal conditions (catalyst = 1.5 cm 2 , PMS = 0.3 g/L), CoP/NF achieved nearly complete removal of 40 mg/L rhodamine B (RhB) within 2 min over a wide pH (3.0–9.0), and maintained a strong anti-interference capacity for NO 3 − , PO 4 2− , Cl − . Furthermore, the degradation efficiency of RhB in the CoP/NF + PMS system remained 98 % even after 5 cycles. Impressively, ROS trapping and electron spin resonance (EPR) analyses revealed that the degradation process was dominantly driven by superoxide radicals (O 2 •– ) and singlet oxygen ( 1 O 2 ), which served as the key mechanism for the CoP/NF + PMS system. This work provided further insights into tuning PMS activation pathway via the integration of metal phosphides growth on nickel foam for sustainable water treatment.
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