Materials Today Communications
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2025
·
IF 4.5
Zhi Qi,Chunlai Liu,Peihang Shen,Zelong Liu,De Sun,Jianglei Hu,Yibo Zhang
With the accelerated consumption of fossil fuels driven by societal development and population growth, acid-catalyzed biodiesel serves as an eco-friendly alternative that effectively enhances reaction processes and reduces pollutant emissions. This study developed a novel dual-acid catalyst, H 3 PW 12 O 40 (PW) and titanium-incorporated phenolic resin (PR) functionalized mesoporous silica (PW/Ti-SiO 2 -PR), via a one-pot hydrothermal method for efficient biodiesel production via oleic acid esterification. The composite’s structure, acidity, and hydrophobicity were systematically characterized using FT-IR, XRD, N 2 physisorption, SEM/TEM, and XPS. Results confirmed the successful integration of PW and Ti into the silica framework, creating synergistic Brønsted (PW) and Lewis (Ti 4 + ) acid sites. The inclusion of low-molecular-weight PR enhanced mesopore formation and hydrophobicity, critical for inhibiting water-induced deactivation. The optimized 0.2PW/Ti0.05-SiO 2 -PR0.25 catalyst achieved 95.2 % methyl oleate yield at 100 °C within 8 h, outperforming conventional solid acids. Notably, the catalyst retained > 90 % activity over five cycles without PW leaching or structural degradation, demonstrating exceptional stability. This work highlights the strategic design of hydrophobic, dual-acid mesoporous catalysts for sustainable biodiesel synthesis.
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高影响因子
APPLIED ENERGY
·
2025
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IF 11
Zhuofan Han,Dengjie Zhong,Yunlan Xu,Haixing Chang,Lin Dong,Yi Liu
In this study, N-doped carbon quantum dots (N-CQDs)/ZnIn 2 S 4 /tubular g-C 3 N 4 (TCN)/Ti photoanode was successfully prepared by a simple one-pot solvothermal method and silica sol drop coating method, which was assembled with Cu x O/Cu cathode to construct photocatalytic fuel cell (PFC) to degrade organic pollutants and generate electricity. The photoanode material aims to promote the separation and uniform transfer of photogenerated electron through the synergistic effect of Schottky junction and S-type heterojunction of 0D quantum dots. The PFC with N-CQDs-doped photoanode possessed strong power generation capacity (71.10·μW-cm −2 ) and high photoelectric conversion efficiency (0.098 %), which were 1.72 and 1.94 times that of the PFC with ZnIn 2 S 4 /tubular g-C 3 N 4 /Ti photoanode. It degraded more than 95 % of rhodamine B, 83.44 % of tetracycline and 50.66 % of bisphenol A within 30 min. The excellent performance of the developed PFC is attributed to the synergistic effect of different heterojunction in photoanode, and the improvement of absorption and utilization of visible light by doping N-CQDs. Both free radicals (•OH, •O 2 − ) and non-free radicals (h + , 1 O 2 ) were involved in the degradation process of pollutants. It is noteworthy that, due to the Schottky junction, the N-CQDs could act as electron warehouses to promote the production of H 2 O 2 , which could enhance the degradation effect. We believe that this research provides a new direction for the development and research work on efficient photoanodes. Synopsis N-CQDs was introduced into PFC photoanode to construct the synergistic effect of Schottky junction and S heterojunction to simultaneously realize efficient pollutants degradation and power generation.
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高影响因子
Sustainable Energy & Fuels
·
2024
·Vol. 8
·期 13
·2889-2899
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IF 5
Jiaqi Wang,Hongyang Huo,Guozhe Sui,Shuang Meng,Dongxuan Guo,Shanshan Fu,Dantong Zhang,Xue Yang,Jinlong Li
The development of visible-light-active photocatalysts with high performance has been regarded as a promising way to address environmental wastewater issues. In this work, a highly efficient g-C3N4/CdS/TiO2 ternary Z-type heterojunction photocatalyst with a hollow structure has been fabricated using a step-by-step self-assembly strategy, which demonstrates excellent photocatalytic performance under visible light and removes various water-soluble organic pollutants effectively. The photocatalytic degradation efficiency of 20-g-C3N4/CdS/TiO2-10 against rhodamine B (RhB) is found to be 29.8 times higher than that of the pristine g-C3N4 within 90 minutes of visible light irradiation attributed to the active species of ˙O2− and h+. Liquid chromatography mass spectrometry results suggest that the degradation pathway of RhB involves main steps such as N-de-ethylation, chromophore cleavage, ring opening, and mineralization. A series of characterization analyses, combined with the observed enhanced photocatalytic performance, indicate that the g-C3N4/CdS/TiO2 ternary heterojunction benefits from the rapid transport and separation of photogenerated carriers facilitated by the formation of a heterointerface. Furthermore, the g-C3N4/CdS/TiO2 ternary heterojunction exhibits favorable stability, with 88.1% degradation efficiency after five cycles of degradation experiments. This work provides novel insights into the preparation and application of ternary heterojunctions with superior photocatalytic performance for eliminating organic pollutants from wastewater.
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高影响因子
Acta Biomaterialia
·
2021
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IF 8.947
Xian Tong,Quanxiang Sun,Dechuang Zhang,Kun Wang,Yilong Dai,Zimu Shi,Yuncang Li,Matthew Dargusch,Shengbin Huang,Jianfeng Ma,Cuie Wen,Jixing Lin
β -type titanium (Ti) alloys have been extensively investigated as orthopedic implant materials due to their unique combination of low elastic modulus , high specific strength , corrosion resistance , and biocompatibility. In this study the mechanical properties , corrosion behavior, friction and wear performance, and cytotoxicity of β -type Ti–24Nb–38Zr–2Mo (TNZM) and Ti–24Nb–38Zr–2Mo–0.1Sc (TNZMS) have been comparatively investigated for orthopedic applications. Cold-rolling (CR) and cold-rolling plus solution-treatment (CR+ST) were performed on the as-cast (AC) alloys and their microstructures and material properties were characterized. The impact of Sc addition on the mechanical and corrosion properties, friction and wear behavior, and in vitro cytocompatibility of the TNZMS alloy was assessed. The CR+ST TNZMS alloy exhibited the best combination of properties among all the alloy samples, with a yield strength of 780 MPa, ultimate strength of 809 MPa, elongation of 19%, Young's modulus of 65.4 GPa, and hardness of 265 HV. Electrochemical testing in Hanks’ Solution indicated that the CR+ST TNZMS sample also showed the highest corrosion resistance with a corrosion potential of -0.234 V, corrosion current density of 0.07 µA/cm 2 , and corrosion rate of 1.2 µm/y. Friction and wear testing revealed that the TNZMS alloy showed higher wear resistance compared to the TNZM alloy and the wear resistance of the different samples was ranked CR > CR+ST > AC. Finally, both the CR+ST TNZM and TNZMS showed no-cytotoxicity towards MG-63 cells and the TNZMS exhibited slightly higher cytocompatibility than the TNZM alloy. Statement of significance This work reports the β -type Ti–24Nb–38Zr–2Mo (TNZM) and Ti–24Nb–38Zr–2Mo–0.1Sc (TNZMS) alloys fabricated by as-cast (AC), cold-rolling (CR), and cold-rolling plus solution-treatment (CR+ST) for potential orthopedic applications. The experimental results showed that the TNZMS alloy exhibited significantly enhanced mechanical, wear, and corrosion properties than those of TNZM alloy; and the CR+ST TNZMS possess a unique combination of the best mechanical and corrosion properties including a yield strength of 780 MPa, ultimate strength of 809 MPa, elongation of 19%, Young's modulus of 65.4 GPa, and corrosion rate of 1.2 µm/y in Hanks’ Solution. Both the CR+ST TNZM and TNZMS alloys exhibited non-cytotoxicity towards MG-63 cells and TNZMS showed a higher cytocompatibility than that of TNZM.
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高影响因子
FUEL
·
2025
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IF 7.5
Yongpeng Ma,Jianghui Du,Yifei Wu,Haobing Yan,Ruiqi Liu,Xiaojing Zhang,Hongzhong Zhang,Liming Zhou,Wenjun Huang
Among the diverse pollutants emitted from coal-fired and non-ferrous metal smelting flue gas, Hg 0 and CO have emerged as globally concerning environmental pollutants. However, the simultaneous abatement of multiple pollutants remains a critical challenge to be addressed. In this study, cobalt nanoclusters (Co NCs) were anchored on the terminal oxygen of Ti-O on Ti 3 C 2 MXene and formed asymmetric oxygen vacancies Co-Ov-Ti via a one-step hydrothermal method, yielding Co NCs/Ti 3 C 2 MXene with a morphology of hierarchical nanosheet-assembled spheres for Hg 0 and CO catalytic oxidation. Co NCs/Ti 3 C 2 MXene exhibited excellent 44 % and 52 % of Hg 0 and CO simultaneous removal efficiency at the optimal temperature of 250 °C, respectively. DFT calculations combined with energy barrier modeling were employed to investigate the reaction pathways and energy variations during the catalytic oxidation of Hg 0 and CO. Specifically, Hg 0 oxidation follows the Eley-Rideal mechanism, with a rate-determining energy barrier of 2.11 eV, while CO oxidation adheres to the Langmuir-Hinshelwood mechanism, featuring a rate-determining barrier of 0.17 eV. In the co-catalytic oxidation process, competitive adsorption between Hg 0 and CO was observed, primarily manifested as competition for Ov on the catalyst surface. This study provides a novel strategy for the synergistic control of multi-pollutants in industrial flue gas.
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高影响因子
OPTICAL MATERIALS
·
2022
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IF 3.754
Yang Wang,Sheng Feng,Changchang Ma,Yun Zhou,Zhiwei Ye,Xiaojun Dai,Xun Cao
In this paper, a novel Mn-doped CdS@NH 2 -MIL-125(Ti) (MC@NT) photocatalytic composites was synthetized through hydrothermal method . Hydrogen desorption and tetracycline and oxytetracycline degradation were performed under visible light to test their photocatalytic activities . The composites were characterized by XRD , FTIR, SEM, TEM, XPS , UV–Vis diffuse reflectance spectroscopy (DRS), EPR , EIS, and transient photocurrent response. From the characterization consequence, it could be seen that Mn-doped CdS was tightly attached to the surface of tetragonal NT in the form of nanoparticles . The MC@NT composites exhibited more promising catalytic activity than pristine monomeric materials. The photocatalytic hydrogen evolution rate reached 3.61 mmol g −1 h −1 . Within 110 min, the degradation efficiencies of TC and OTC were 90% and 88%, respectively. The free radical trapping experiments proved that ·O 2 − and h + were decisive role for degrading pollutants in the degradation catalysis process. Radical trapping experiments and electron spin resonance (ESR) indicated that the Z-scheme heterojunction was formed between Mn-doped CdS and NT, leading to facilitate the migration and shift of photogenerated carriers and holes. Cycling experiments showed that the as-prepared composites have good stability and have good prospects for practical applications. We believe this work will offer new ideas on the future development of efficient heterojunction catalysts for light energy conversion and other applications.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 31
·期 9
·2009610
·
IF 16.836
Yong Yan,Chunyue Liu,Hanwen Jian,Xing Cheng,Ting Hu,Dong Wang,Lu Shang,Ge Chen,Peter Schaaf,Xiayan Wang,Erjun Kan,Tierui Zhang
The development of economical, highly active, and robust electrocatalysts for oxygen evolution reaction (OER) is one of the major obstacles for producing affordable water splitting systems and metal-air batteries. Herein, it is reported that the subnanometric CoO x clusters with high oxidation state substitutionally dispersed in the lattice of rutile TiO 2 support (Co-TiO 2 ) can be prepared by a thermally induced phase segregation process. Owing to the strong interaction of CoO x clusters and TiO 2 support, Co-TiO 2 exhibits both excellent intrinsic activity and durability for OER. The turnover frequency of Co-TiO 2 is up to 3.250 s −1 at overpotentials of 350 mV; this value is one of the highest in terms of OER performance among the current Co-based active materials under similar testing conditions; moreover, the OER current density loss is only 6.5% at a constant overpotential of 400 mV for 30 000 s, which is superior to the benchmark Co 3 O 4 and RuO 2 catalysts. Mechanism analysis demonstrates that charge transfer occurs between Co sites and their neighboring Ti atoms, triggering the efficient Co Ti cooperative catalytic centers, in which OH* and O* are preferred to be adsorbed on the bridging sites of Co and Ti with favorable adsorption energy, inducing a lower energy barrier for O 2 generation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Yanlei Liu,Mengbo Shan,Lange Du,Weihao Sun,Dapeng Wu,Qing Bi,Hongju Wang,Yufang Liu
A scalable strategy with commercial feasibility was developed to in situ generate TiO 2 nanowires/amorphous CuS@TiO 2 nanolayer (TiO 2 /CuS@TiO 2 ) composites on the surface of titanium mesh through a sequent hydrothermal method, successive ionic layer adsorption and reaction (SILAR), and atomic layer deposition (ALD) techniques. The TiO 2 /CuS@TiO 2 composites could respectively harness the incident light with different spectra at the photothermal center (CuS, visible and near-infrared light) and photocatalytic center (TiO 2 , UV and visible light), which leads to the effective utilization of the solar energy. Benefiting from the CuS photothermal-induced local heating effect of CuS, the adjacent micro-zone temperature could be elevated and the activation energy barrier could be reduced by 10.5 kJ mol −1 , which promotes the activation of surface lattice oxygen and dissolved oxygen in the photocatalytic process. Meanwhile, the ALD generated TiO 2 nanolayer could both serve as reactive centers but also protecting armor for the CuS, which prohibited the peeling and oxidation of the thermal centers, leading to a high stability of the photocatalyst, which exhibits no obvious fading after 20-cycle reuse. A flow reactor was conceived and made by 3D print and the Ti-mesh based photocatalyst was integrated, which demonstrates high photocatlytic performances, manifesting its great potential for large-scale water treatment.
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高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Xianrui Zhao,Mengxian Zhang,Zhanjiang Li,Yangyang Zhao,Xunbai Du,Yunsong Cui,Qiangyong Zhang,Serhiy Serbin
TiB 2 -reinforced ultrafine Ti(C,N)-based cermets are fabricated via reactive spark plasma sintering. This study investigates the effect of carbon sources on the sintering processes, microstructures, and mechanical properties of cermets derived from a Co-Ni-Y-Ti-BN-WC-VC-Mo 2 C-TaC-C system. Results reveal that the sintering process involves both solid-state reactions and liquid-phase sintering stages. Compared to graphitic graphite and graphene, amorphous carbon black and nanocarbon exhibit higher reactivity and smaller particle sizes. This characteristic inhibits the Co Ti and Ti Ni reactions but promotes the Ti-BN reaction, thereby reducing the shrinkage rate during the solid-state reaction stage. During the liquid-phase sintering stage, carbon dissolves into the molten metal and subsequently diffuses into preformed TiN to create Ti(C,N). The use of carbon black and nanocarbon facilitates greater consumption of carbon. Consequently, there is an increase in shrinkage rate during this stage, a reduction in residual carbon within the final sintered samples, and an enhancement in relative density. Moreover, C atoms present in the liquid phase would promote the diffusion of heavy metals into Ti(C,N). When graphite or graphene is used as a source of carbon, Ti(C,N) with a black core/Gy rim structure is obtained. In contrast, employing carbon black or nanocarbon encourages the diffusion of heavy metals toward the center of Ti(C,N). This behavior contributes to the achievement of weak core/rim-structured Ti(C,N) and coreless solid solution particles with finer particle sizes, respectively. As a result of these processes, the synthesized cermet attains an optimal hardness of 2145 HV and K IC of 7.67 MPa·m -1/2 , along with a minimal wear depth of 8.19 μm.
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高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Zhicheng Xu,Jin Xiong,Yuran Li,Junxiang Guo,Bin Wang,Tingyu Zhu
For industrial flue gas purification at medium and low temperatures, it is highly necessary to promote the denitrification activity of V-based catalysts in a SO2 atmosphere. Transition metals (Ce, Co, Fe, and Mn) are used to modify V/Ti catalysts to improve SO2 resistance with ammonium bisulfate deposition on the catalysts. Sulfation on Ce with less ammonium bisulfate deposition considerably improves the SO2 resistance of V1Ce5/Ti, and stable sulfation on TiO2 promoted by Co provides additional Brønsted acid sites for V1Co5/Ti to reduce the deactivation. Serious sulfation on V1Mn5/Ti with large ammonium bisulfate deposition on V1Fe5/Ti causes deeper deactivation. The formation mechanism of ammonium bisulfate on active metal sites and TiO2 carriers has been clarified. SO2 is adsorbed on V sites and transition metal sites followed by oxidation and ammoniation or adsorbed on TiO2 carriers followed by ammoniation and oxidation. The first pathway is more dominant than the second pathway in the presence of O2 with the co-oxidation of SO2 by O2 and lattice oxygen. The initial formation temperature and stable temperature of dominant intermediates were determined by in situ DRIFTS. SO2 adsorbed on TiO2 carriers is oxidized by V sites above 170 °C to form a tridentate sulfate, while SO2 adsorbed on transition metal sites is initially oxidized by transition metal sites above 50 °C to form monodentate and bidentate sulfates, as well as competitively oxidized by V sites above 170 °C to form tridentate sulfates. The selective adsorption of SO2 on transition metal sites or TiO2 carriers and the competitive oxidation of SO2 by transition metal sites and V sites provide a synergistic effect between V sites and transition metal sites to reduce ammonium sulfate deposition and release more active sites. These findings provide theoretical guidance to design and prepare V-based catalysts with high denitrification activity in the presence of SO2.
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高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Yiqing Zeng,Zihua Wu,Lina Guo,Yanan Wang,Shule Zhang,Qin Zhong
The problems of easily inactivated by SO 2 poisoning and high N 2 O formation for MnO x based catalysts hinder its application in selective catalytic reduction (SCR) of NO x with NH 3 . The SO 2 poisoning mechanism has been well demonstrated, but the N 2 O formation mechanism was still controversial due to previous limited study. Herein, MnO 2 supported on MO x (Mn/M, M = Al, Si and Ti) were prepared by wet impregnation method to investigate the carrier effect on the formation of N 2 O. Although all of selected supports had a large amount of surface acid sites, only forming strong active-support interaction can separate the activation sites of NH 3 and NO + O 2 . Accordingly, the activation of NH 3 and NO + O 2 on MnTi was respectively occurred on TiO 2 and MnO 2 , but both NH 3 and NO + O 2 was activated on MnO 2 over MnAl and MnSi samples. The over-activation (NH 2 dissociated into NH) of NH 3 would be effectively inhibited when NH 3 activation was occurred on TiO 2 , thus it can significantly suppress the formation of N 2 O. In contrast, the NH 3 species would sharply decompose into NH on MnO 2 and then lead to the high amount of N 2 O. Finally, we proposed some methods that might effectively improve the selectivity of MnO x- based catalysts.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ruirui Zhang,Shugui Hua,Yuan Dang,Bing Zhang,Xiaoqin Sun,Sha Yu,Yingying He,Shuangli Chen,Yuanzhen Zhou
In this paper, the electrocatalytic performance of Ti/β-PbO 2 anode was improved by doping Cs into SnO 2 intermediate layer (Ti/Cs-SnO 2 /β-PbO 2 ) for the efficient degradation of fluoroquinolone wastewater. Compared with the conventional Ti/Sb-SnO 2 /β-PbO 2 anode, Cs-SnO 2 with the rougher surface increased the deposition amount and the thickness of β-PbO 2 active layer, thus forming the denser PbO 2 coating with smaller particle size and exposing more active sites. The partial replacement of Sn by Cs with the smaller ion radius induced the deformation of crystal lattice of SnO 2 , which further led the outer β-PbO 2 active layer grew along the advantageous (200) crystal plane and formed more point defects in the crystal lattice of β-PbO 2 . Thereby, the electron transfer rate at the anode interface was accelerated and the electrocatalytic performance of Ti/β-PbO 2 was significantly improved. To verify the practical application of the improved Ti/Cs-SnO 2 /β-PbO 2 electrode, levofloxacin (LFX) and ciprofloxacin (CIP) were selected as the typical target fluoroquinolones to evaluate the degradation efficiency of Ti/Cs-SnO 2 /β-PbO 2 anode. The removal rate exceeded more than 90% for the single and mixed fluoroquinolones wastewater. Moreover, after 5 times’ recycle, the degradation efficiency of LFX on Ti/Cs-SnO 2 /β-PbO 2 anode still remained over 90%. The potential mechanism of the enhanced electrocatalytic performance of Ti/Cs-SnO 2 /β-PbO 2 and the degradation pathways of fluoroquinolones were also inferred. It’s the first time to enhance the electrocatalytic performance of the Ti/β-PbO 2 anode by introducing monovalent alkali metal (C S ) into the SnO 2 intermediate layer and the proposed Ti/Cs-SnO 2 /β-PbO 2 anode would be a promising candidate to realize the efficient removal of the practical fluoroquinolones antibiotic wastewater.
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高影响因子
危险品化学品经营许可证（带存储）