NANO
·
2021
·
IF 1.556
Ye Shang,Manfei Lv,Songtian Li
A new type of pure organic 5,10,15,20-tetra (4-hydroxyphenyl) porphyrin (TPPH)/ g -C 3 N 4 nanohybrid was prepared to expand the light absorption range of graphitic carbon nitride materials. The morphology and structure of the composites were systematically characterized by scanning electron microscope, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Results show that after the introduction of TPPH, the visible light area optical absorption of the composite sample increased significantly under the noncovalent interaction of TPPH and g -C 3 N 4 , and the electrochemical impedance spectroscopy and I – T measurements confirmed the improved charge separation efficiency of the sample and showed excellent photocatalytic hydrogen production capacity. Under full spectrum irradiation, the hydrogen production of 1.67% TPPH/ g -C 3 N 4 without adding co-catalyst reached 10.87 mmol ⋅ g − 1 ⋅ h − 1 , about 2.68 times that of pure g -C 3 N 4 (4.06 mmol ⋅ g − 1 ⋅ h − 1 ), which showed effective promotion of the electron transfer between TPPH and g -C 3 N 4 .
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 50
·期 1
·799-809
·
IF 5.2
Huan Zhong,Yunzhong Liu,Zhiguang Zhou,Zhenhua Fan,Zhiheng Shu,Lidong Wu
High fracture toughness and excellent hydrothermal aging resistance are the characteristics required for dental ceramic materials, but the widely used dental ceramic currently (3Y-TZP) does not exhibit. Aiming to solve this problem, a ternary rare earth co-stable zirconia ceramic (1.5Y5.5Ce0.3La-ZrO 2 ) was prepared by a coating method based on a co-doping strategy. The sintering process, densification evolution, mechanical properties, resistance to hydrothermal aging and biocompatibility of 1.5Y5.5Ce0.3La-ZrO 2 ceramic were studied. The results show that 1200 °C is the best pre-sintering temperature, and the machinability and controllability of shrinkage can meet the needs. When the final sintering temperature is 1600 °C, it has the best performance. Compared with 3Y-TZP, the bending strength is about 8.7% higher (912.48 MPa), and the fracture toughness is about 76.6% higher (10.49 MPa m 1/2 ). Furthermore, its resistance to hydrothermal aging is significantly enhanced, greatly extending the service life of the material. The biosafety of 1.5Y5.5Ce0.3La-ZrO 2 ceramics was evaluated, and the results showed that the material had no cytotoxicity. To sum up, 1.5Y5.5Ce0.3La-ZrO 2 ceramics is a promising dental biomaterial, which has a broad application prospect in oral restoration.
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Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 38
·9885-9893
·
IF 4.696
Quan Xu,Yao Liu,Chun Gao,Jianfei Wei,Hongjun Zhou,Yusheng Chen,Chenbo Dong,Theruvakkattil Sreenivasan Sreeprasad,Neng Li,Zhenhai Xia
Heteroatom doped carbon dots (CDs) with consummate photoluminescence quantum yield (PLQY) are of great interest in various applications such as trace element detection, biomolecule markers, and chemical sensing. However, due to the low doping efficiency of the reaction, a high precursor ratio is routinely used to obtain CDs with considerable photoluminescence quantum yield (PLQY). In this contribution, we report a single-step hydrothermal method having the highest doping efficiency to synthesize sulfur and nitrogen co-doped semi-crystalline carbon dots (S,N-CDs) with superior quantum yield (QY). Here, the unprecedented doping efficiency of the reaction enables an order of magnitude reduction in the starting precursor ratio, in comparison with previous reports. Moreover, for the first time, complementary theoretical and comprehensive spectroscopic techniques were employed to derive deep insight into the photoluminescence mechanism and the shifting of specific energy levels in doped CDs was identified as the reason behind the enhanced photoluminescence of doped CDs. The PLQY and luminescent characteristics of the S,N-CDs can be tuned by controlling the precursor molar ratio, the extent of surface oxidation, and chemical status of S in the CDs. While most methods report high PLQY for amorphous CDs, our technique produces semi-crystalline CDs with more than 55% QY. Another unique attribute of the S,N-CDs is the high monodispersity and defined surface chemistry and the resultant highly robust excitation-independent luminescence that is stable over a broad range of pH values and in an extremely reactive environment. The detailed structural and chemical investigations using spectroscopic and microscopic techniques combining molecular simulation revealed that the superior PLQY and luminescence of S,N-CDs are due to the heteroatom directed, oxidized carbon-based surface passivation. The remarkable, robust fluorescence properties of S,N-CDs were applied for the ultra-trace detection of Hg2+ with a detection limit of 100 pM. The novel insights into the photoluminescence of doped CDs, the robust luminescence, and enhanced doping reaction efficiency reported here are envisaged to drive transformative changes in the design of CDs with peerless properties for futuristic applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Teng Lu,Zhaomin Li,Liping Du
Inherent obstacles of hydrogen injection encompass preferential channeling through larger pathways, hampering microscopic sweep efficiency within porous media. This work pioneers hydrogen foam generation via co-injection with aqueous sodium dodecyl sulfate (SDS) to enhance subsurface hydrogen trapping capacity. SDS addition substantially reduces hydrogen-water interfacial tension and enhances viscoelasticity. In contrast to robust hydrogen foam stability, CO 2 foams display compromised integrity, stemming from surfactant aggregation and ensuing infiltration channels that permit aqueous phase CO 2 dissolution. Hydrogen foams conversely sustain uniform surfactant films, forestalling hydrogen ingress into water. Synergetic microfluidic and pore-scale simulations visualise mechanisms underlying intensified hydrogen capture and mobility reduction attributed to deformation and flow resistance when traversing constricted pores. Introducing the amphiphilic SDS surfactant considerably promotes hydrogen adsorption through its hydrophobic tail. Core flooding experiments quantify over 2 times hydrogen storage ratio amplification with SDS relative to sole hydrogen injection. The framework contributes pragmatic strategies to harness high-efficiency hydrogen foam for scalable clean energy storage.
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Zhitong Zhou,Weixiang Guan,Xiaoli Pan,Shengxin Zhang,Yang Su,Aiqin Wang,Tao Zhang
Synthesis of primary amines from alcohols is an economical and green route to access high-value N-compounds. However, challenges remain to develop both cost-effective and efficient catalysts. In this study, we developed a Ru-Co/ZrO 2 single-atom alloy catalyst which afforded diverse primary amines from alcohols in the presence of ammonia and hydrogen with exceptional conversion (up to 90%) and selectivity (80%) under mild conditions (0.7 MPa NH 3 , 0.3 MPa H 2 , 160 °C) and exhibited satisfactory stability upon regeneration. The turnover rate was approximately 8.4 times higher than that observed over the Co/ZrO 2 catalyst. Characterizations indicated that the alloyed Ru facilitated the reduction of Co, strengthened the interaction with H 2 and mitigated the over-strong adsorption of aldehyde intermediates. These combined effects contributed significantly to the enhanced catalytic performances. This work presents a promising strategy for the development of advanced catalysts in the amination of alcohols.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yu Zhang,Yangang Sun,Luyao Pan,Zhaoxia Wen,Min Shi,Hao Li
Aiming at the bottleneck problems of limited visible light response range and high carrier recombination rate of Bi 2 O 2 CO 3 (BOC) photocatalyst, Ca 2+ /Ce 3+ co-doped Bi 2 O 2 CO 3 composite photocatalyst was constructed by hydrothermal method. The analysis of different characterization techniques shows that double doping can lead to lattice distortion and induce oxygen defects. Under visible light irradiation, the degradation efficiency of ciprofloxacin (CIP) and levofloxacin (LVX) by BOC-Ca-Ce4 reached 92.56 % and 90.39 %, respectively, and maintained a certain degradation efficiency in complex water bodies such as tap water and lake water. ESR and capture experiments confirmed that •O 2 − and h + were the dominant active species. Mechanism analysis showed that the valence cycle of Ce 3+ /Ce 4+ and the local electric field of Ca 2+ synergistically promoted the spatial separation of carriers. Through intermediate product analysis, CIP was finally mineralized to CO 2 /H 2 O, and the ECOSAR toxicity assessment showed that the ecological toxicity was reduced. This study provides a new design strategy for energy band engineering of two-component doped photocatalysts.
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PubMed
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Yuhan Yuan,Ruijuan Wang,Xuefeng Wu,Dongdong Mu,Li Guo,Xingjiang Li
Corn silk, an agricultural by-product rich in bioactive compounds, has long remained underutilized. In this study, we systematically examined how probiotic co-fermentation influences the bioactivity, flavor profile, and metabolic landscape of corn silk. The results demonstrated that fermentation significantly enhanced the total phenolic content by 73.31 % and flavonoid content by 80.20 %, along with a substantial improvement in antioxidant capacity. Volatile compound analysis identified 36 key aroma-related substances. Notably, 4-methylguaiacol and 4-ethylguaiacol contributed to both improved flavor and antioxidant function, highlighting a synergistic relationship between sensory quality and bioactivity during fermentation. Non-targeted metabolomics further revealed substantial changes in the metabolic profile post-fermentation, with 110 differential metabolites identified—75 upregulated and 35 downregulated. These metabolites were primarily enriched in the TCA cycle, phenylpropanoid biosynthesis, and amino acid metabolism pathways. Together, these findings uncover the molecular mechanisms by which probiotic fermentation remodels metabolic networks to enhance both the functional and sensory attributes of corn silk. This work offers a theoretical foundation and technical guidance for the high-value utilization of agricultural by-products and the development of functional foods.
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Advanced Science
·
2022
·Vol. 9
·期 17
·2200518
·
IF 17.521
Juan Meng,Zhihan Tong,Haixin Sun,Yongzhuang Liu,Suqing Zeng,Jianing Xu,Qinqin Xia,Qingjiang Pan,Shuo Dou,Haipeng Yu
An in-depth understanding of the electronic structures of catalytically active centers and their surrounding vicinity is key to clarifying the structure–activity relationship, and thus enabling the design and development of novel metal-free carbon-based materials with desired catalytic performance. In this study, boron atoms are introduced into phosphorus-doped nanoporous carbon via an efficient strategy, so that the resulting material delivers better catalytic performance. The doped B atoms alter the electronic structures of active sites and cause the adjacent C atoms to act as additional active sites that catalyze the reaction. The B/P co-doped nanoporous carbon shows remarkable catalytic performance for benzyl alcohol oxidation, achieving high yield (over 91% within 2 h) and selectivity (95%), as well as low activation energy (32.2 kJ mol −1 ). Moreover, both the conversion and selectivity remain above 90% after five reaction cycles. Density functional theory calculations indicate that the introduction of B to P-doped nanoporous carbon significantly increases the electron density at the Fermi level and that the oxidation of benzyl alcohol occurs via a different reaction pathway with a very low energy barrier. These findings provide important insights into the relationship between catalytic performance and electronic structure for the design of dual-doped metal-free carbon catalysts.
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Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Chen Zeng,Wei Chaochao,Li Shengjun,Diao Chunli,Li Wei,Kong Wenping,Zhang Zhenlong,Zhang Weifeng
SnO 2 nanosheet-structured films were prepared on a fluorine-doped tin oxide (FTO) substrate using ZnO nanosheet as template. The as-prepared SnO 2 nanosheets contained plenty of nano-voids and were generally vertical to the substrate. TiO 2 nanoparticles were homogeneously deposited into the intervals between the SnO 2 nanosheets to prepare a hierarchically structured SnO 2 /TiO 2 hybrid film. The hybrid films were co-sensitized with CdS and CdSe quantum dots. The sensitized solar cells assembled with the SnO 2 /TiO 2 hybrid film showed much higher photoelectricity conversion efficiency than the cells assembled with pure TiO 2 films. The lifetime of photoinduced electron was also investigated through electrochemical impedance spectroscopy, which showed that the SnO 2 /TiO 2 hybrid film electrode is as long as the TiO 2 film electrode.
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PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Xiaodong Yang,Zhiyong Hou,Xuefei Yang,Minghui Li,Yuanxia Guo,Kai Wang,Shuaiqi Luo,Jin Zhao,Pengkai Sun,Qiang Yang,Rui Chen,Yan Yan,Lulu Liu,Lili Wang,Ye Han,Fanming Zeng,Andrew R. Zimmerman,Bin Gao
New efficient and sustainable methods for the removal of malachite green (MG) from environmental media are needed. In this study, corn straw was co-pyrolyzed with montmorillonite under a variety of conditions (400, 500, 600, and 700 °C and 10–40 wt% montmorillonite), without any use of toxic chemicals, to produce a series of biochar-clay composites. Characteristics of the composites that make them promising contaminant sorbents include a uniform lamellar-particle micromorphology, enhanced mesoporous structure and surface area (53.0 m 2 g −1 ), and abundant and diverse oxygen/carbon-containing functional groups (i.e., O-H, C-O, C=C, and C-H). The composite produced at 600 °C and 10 wt% montmorillonite had the highest observed MG removal from aqueous solution (6572.1 mg g −1 , 99.6% removal rate). Adsorption of MG by the sorbent was attributed to multiple sorption mechanisms, including physical interaction, cation exchange, and π-π bonding interactions, and was modulated by intra-particle diffusion. This work highlights the potential of corn straw biochar-montmorillonite composites as a favorable adsorbent for environment remediation and water treatment.
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PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·5773-5785
·
IF 3.5
Qu Ai,Shi-Kuan Sun,Peng-Wei Hao,Yuan-Bin Chen,Yi Zhao,Sheng-Heng Tan,Wei-Ming Guo,Hua-Tay Lin
The aqueous reprocessing of spent nuclear fuel generates a considerable amount of plutonium alongside contaminated stainless steel, necessitating meticulous handling for safe decommission and long-term management. The present work investigated the co-immobilization of CeO 2 (as an inactive surrogate for PuO 2 ) with metallic Fe and Cr (representing a simplified stainless steel) within a zirconolite ceramic wasteform, nominally targeting Ca 1− x Ce x ZrTi 2−2 x Fe x Cr x O 7 . After sintering at 1400°C under an air atmosphere, the zirconolite phase constituted 90.8–95.1 wt.% of the product across the solid solution range of 0.05 ≤ x ≤ 0.25, alongside perovskite and baddeleyite secondary phases in varying proportion; no evidence of the unincorporated CeO 2 or metallic and oxidized Fe or Cr were identified. Above x = 0.30 CeO 2 was detected inferring, the solubility limit was reached. A polytype transformation from zirconolite 2M to 3T was confirmed by X -ray diffraction and selected area electron diffraction results, with the relative fraction of the 3T phase gradually increasing to 49.5 wt.% at x = 0.30. Deconvolution of X-ray photoelectron spectroscopy data revealed the partial reduction of Ce 4+ –Ce 3+ , whereas Fe and Cr species maintained trivalent, in agreement with the targeted substitution scheme. Benefitting from the excellent chemical flexibility of zirconolite structured compounds, the co-immobilization approach may be an effective disposal pathway for Pu-containing wastes and contaminated stainless steel residues.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Yao Tong,Tianhua Yang,Jian Wang,Bingshuo Li,Haijun Zhang,Rundong Li
Hydrodeoxygenation (HDO) of lignin-derived phenolic compounds plays a crucial role in the production of renewable biofuels. In this regard, a series of different Co@NC catalysts were prepared with ZIF-67 as a sacrificial template by modulating the catalyst pyrolysis temperature and used for the catalytic hydrodeoxygenation of lignin-derived phenolic model compound 4-ethylphenol for the preparation of cyclohexanols/ cyclohexanes. The results showed that the low-temperature pyrolysis will retain a large number of CoO x compounds, which led to a high dispersion of Co. For Co@NC catalysts, the uniformly dispersed Co component facilitated the adsorption and transfer of hydrogen, and the exposed surface of the carrier promoted the adsorption of reactants. The pyrolysis temperature also played a crucial role in the differences in catalyst crystal surface, specific surface area, acid strength distribution and oxygen vacancies. Co@NC catalyst prepared at 600 °C has a stronger hydrogen absorption capacity, the largest specific surface area and a higher number of oxygen vacancies. Therefore, the Co@NC-600 catalyst showed the best HDO activity. Under the mild conditions (220 °C, 2.5 h and 3 MPa H 2 ), the conversion of 4-ethylphenol was close to 100 %, and the selectivities of 4-ethylcyclohexanol and ethylcyclohexane were 62.7 % and 10.8 %, respectively.
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