Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 38
·20195-20201
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IF 8.867
Jiuwang Gu,Qitong Huang,Yufei Yuan,Kai-Hang Ye,Zilong Wang,Wenjie Mai
Unfavorable interfacial electron back-injection, sluggish surface kinetics, and poor bulk conductivity leading to remarkable recombination are the key issues which significantly hinder the solar-to-hydrogen efficiency of PEC photoanodes. In this study, Ti foil is employed as the substrate for fabricating BiVO4 photoanodes. Surface passivation of TiO2 is sophisticatedly designed to block interface recombination in solar water splitting for the first time, so that a significant two-fold increase in photocurrent and a large decrease in dark current are observed. In addition, to address the other two issues, CoOx oxygen evolution catalysts (OECs) and Mo/N doping are applied to increase the photocurrent density and applied bias photon-to-current efficiency to 5.04 mA cm−2 at 1.23 VRHE and 1.41% at 0.75 VRHE, respectively, under AM 1.5 G illumination, which suggests the great potential of integrating strategies to target specific issues in BiVO4 photoanodes.
研究领域:
材料科学
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能源科学
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光电化学
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高影响因子
CERAMICS INTERNATIONAL
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2017
·
IF 2.986
Yong Huang,Wendong Wang,Xuejiao Zhang,Xiaoting Liu,Zhiwei Xu,Shuguang Han,Zhuobin Su,Huiying Liu,Yuan Gao,Hejie Yang
Orthopedic implants need to be coated with biomedical coatings that can facilitate osseointegration and mitigate bacterial biofilm formation. Using anodisation and electrodeposition techniques, we modified Ti implants with a double-layer coating made of TiO 2 nanotubes (TNT) and hydroxyapatite that was codoped with silver and manganese (AgMnHA). The silver incorporation into hydroxyapatite improves its antimicrobial properties, and the manganese doping offsets the potential cytotoxicity of the incorporated silver. The AgMnHA and the TNT films were characterized with X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The results highlight that the manganese and silver ions were evenly incorporated into the AgMnHA/TiO 2 coating. Its adhesion strength significantly increased because of the interlocking of the rough TiO 2 layer with the bioceramic particles that entered into the voids of the TiO 2 nanotubes. The coating decreases the corrosion current density of titanium from 3.71 μA to 0.19 μA, and increases its corrosion resistance by almost two orders of magnitude. The coating can continuously release silver ions into the bacterial suspension, resulting in excellent antimicrobial efficacy with a 100% reduction in viable cells. Both hydroxyapatite and the AgMnHA/TiO 2 coating are super-hydrophilic; meanwhile, if immersed in a simulated body fluid, they could induce the deposition of typical spherical apatite . In-vitro cell culture tests demonstrated that hydroxyapatite and the AgMnHA/TiO 2 coating considerably improved the cell viability and the alkaline phosphatase (ALP) activity. Therefore, the AgMnHA coating has no significant cytotoxicity on osteoblasts, and could generate sufficient osteoblast differentiation for osseointegration. We therefore find that a bilayer AgMnHA/TiO 2 coating on Ti implants improves antibiofilm properties that does not offset the hydroxyapatite biocompatibility that is needed for successful osseointegration and bone healing.
研究领域:
生物材料学
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医学工程
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表面科学
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SOLAR ENERGY
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2019
·
IF 4.674
Han Song,Zhenxiao Pan,Huashang Rao,Xinhua Zhong
The time-consuming transport of photo-generated electrons across conventional photoanode film, composed of disordered P25 TiO 2 nanoparticulates, is one of the main bottlenecks to improve the performance of quantum dot-sensitized solar cells (QDSCs). A convenient and effective method was developed for the preparation of high performance photoanodes based on composite paste composed of conventional P25 TiO 2 nanoparticulates and TiO 2 hierarchical nanowires (HNW) for QDSCs. The shortened transport path in the composite photoanode brings forward suppressed charge recombination processes at the interfaces between photoanode and electrolyte, and improved photovoltaic performance of the resulting solar cells. Through optimizing the composite photoanode and the adoption of N-doped mesoporous carbon/Ti counter electrodes, average power conversion efficiency of Zn-Cu-In-Se (ZCISe) QDSCs was increased from 12.77% corresponding to conventional P25 photoanodes to 13.43% ( J sc = 27.38 mA cm −2 , V oc = 0.764 V, and FF = 0.642) corresponding to photoanodes with HNW/P25 weight ratio of 0.1%. Furthermore, this composite photoanode is also effective in improving the photovoltaic performance of QDSCs under different QD sensitizers (such as Zn-Cu-In-S (ZCIS) QDs) as well as different counter electrodes (such as Cu 2 S/brass).
研究领域:
材料科学
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能源技术
·
光电化学
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Xiangqian Ren,Lianyan Zhu,Bin Guo,Wenting Liu,Shuang Yu,Xingfu Zhou
Ti/TiO 2 NTs/SnO 2 –Sb–Mo anode was prepared by adding intermediate layers and elemental doping and GF/Cu–C 3 N 4 cathode was prepared by impregnation method. The electrode was characterized by SEM, XRD, LSV, CV, and EIS, which show that a more uniform and finer-grained surface structure with higher electrocatalytic activity can be prepared by doping and the addition of TiO 2 -NTs interlayer. In addition, the cathode demonstrate the successful loading of Cu–C 3 N 4 on graphite felts (GFs) by SEM and EDS. The electrochemical test shows the high electrochemical activity. The high activity of the two-electrode system was verified according to the hydroxyl radical test, and then the two electrodes were applied to the degradation of 50 mg/L methylene blue wastewater at the same time, and the results showed that the degradation rate was 98.09% in 20 min, and the COD removal was as high as 80.11%, which is 1.33 times and 2.83 times of the single-anode and single-cathode systems, respectively. In addition, the system could show excellent degradation performance in a wide pH range. At the same time, the energy consumption of the two-electrode system is only 110.9 KWh/Kg. Finally, after ten consecutive decolorization experiments, the decolorization rate of methylene blue and the removal rate of COD could still reach 90.5% and 68.7% in 20 min, which indicated that the dual-electrode system had excellent reusability. The study opens a door to the practical application of electrochemical treatment of wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Ji Shu,Kanming Wang,Virender K. Sharma,Xiping Xu,Nasri Nesnas,Hongyu Wang
This paper presents Fe(VI) combined with Ti/Zn layered double hydroxide (Fe(VI)-Ti/Zn LDH) as a composite to degrade organic pollutants (pesticides and pharmaceuticals) under visible light (VL). The Fe(VI)-LDH/VL system was shown to effectively activate Fe(VI) and simultaneously enhance separation and migration of electrons-holes on the Ti/Zn LDH surface. Furthermore, the Fe(III) particles resulting from the Fe(VI) reduction were adsorbed and coordinated onto the LDH surface to form an in-situ heterojunction photocatalyst which narrowed the wide bandgap from 3.08 eV to 1.44 eV of the LDH and achieved further oxidation of pollutants. Detailed kinetic and mechanistic investigations using the pesticide, imidacloprid (IMI), revealed multi-oxidant intermediate species (Fe V /Fe IV , OH, h VB + and O 2 − ) involved in degrading the parent micropollutant and yielding oxidized products. This study also assessed the application of Fe(VI)-Ti/Zn LDH composite to other pesticides and pharmaceuticals (carbaryl (CAB) and metribuzin (MBZ), trimethoprim (TMP) and carbamazepine (CBZ)), and exhibited satisfactory micropollutants removal. The newly reported VL-induced Fe(VI) activation system, based on Fe(VI)-Ti/Zn LDH composite, may be an effective multi-oxidant strategy to oxidize pollutants in water.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Ruolan Li,Xingyan Liu,Yacen Tang,Jianning Yu,Ya Chen,Min Fu,Siqi Li,Youzhou He
In this study, a highly efficient bifunctional porphyrin-based MOFs with uniformly in-situ generated g-C 3 N 4 quantum dots (g-CNQDs) was fabricated for photocatalytic hydrogen evolution and NO removal, in which PtTCPP as the organic ligand and mixed Zr/Ti-oxo clusters as the metal nodes. Compared with most reported Zr-based porphyrin MOFs, the g-CNQDs@Zr-MOFs(Pt)(Zr/Ti) exhibited outstanding hydrogen evolution activity (14511.57 μmol g −1 ) and NO removal rate (31.9 %) under visible light irradiation. The obviously improved photocatalytic performance could be attributed to the significantly enhanced charge separation and transfer rates by the mixed Zr/Ti-oxo clusters via the rapid Ti 3+ /Ti 4+ process. Moreover, the uniformly in-situ generated g-CNQDs via confinement effect in the cavity of MOFs could also improve the utilization of visible light especially through the up-conversion effect, and promote charge carriers separation. This work provides an idea for us to expand the scope of light utilization and promote charge transfer and separation rates of MOFs via functionalizing host MOFs matrix and coupling guest active species to improve photocatalytic performance further.
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Yundong Zeng,Yunlan Xu,Dengjie Zhong,Jiaxin Mou,Haoyang Yao,Nianbing Zhong
The development of photocatalytic fuel cell (PFC) with visible-light response is usually limited by the low efficiency of electron-hole separation in photoanode . In this work, 20%-PTh/Ag 3 PO 4 /BiOI/Ti photoanode was prepared for the first time to construct a PFC with Cu 2 O/Cu cathode to degrade rhodamine B. With visible-light stimulation, the rhodamine B degradation rate, maximum photocurrent density and maximum power density of the PFC were respectively 96.33% (2 h), 0.39 mA cm −2 and 82.20 μW cm −2 . The main active species in the PFC were proved by quenching experiments to be h + , ∙OH and ∙O − 2 . The satisfactory performance of the PFC was due to that a double Z-scheme heterojunction was formed in the photocatalyst of 20%-PTh/Ag 3 PO 4 /BiOI/Ti photoanode, which made the photogenerated electrons of Ag 3 PO 4 and BiOI directly combine with the photogenerated holes of PTh , so that the photogenerated holes of Ag 3 PO 4 and BiOI and the photogenerated electrons of PTh directly or indirectly participated in the degradation reaction of RhB. In this way, the separation efficiency of electron-hole pairs in the photoanode was improved, and the performance of the PFC was significantly enhanced.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Jian Wang,Changchun Chen,Zhihao Zhao,Cheng Cheng,Zhonghai Tang,Zhou Du,Yifeng Wang,Lin Pan
Considerable attentions are currently paid to water pollution, which seriously threats human health. Semiconductor catalysts with step-like (S-scheme) heterojunction are often used for degrading organic pollutants in water bodies due to their high carrier separation efficiency, high redox capacity, and broad light absorption capacity. In this paper, a novel S-scheme N-doped g-C 3 N 4 /NH 2 -MIL-125(Ti) heterojunction composite is synthesized for photodegradation of organic pollutants. The structural measurements indicate that the NH 2 -MIL-125(Ti) nanoparticles are intimately anchored on the surface of porous N-doped g-C 3 N 4 nanosheets . The experimental characterizations as well as the DFT theoretical calculation for samples demonstrate that the N-doped g-C 3 N 4 /NH 2 -MIL-125(Ti) composites not only bear larger specific surface area providing abundant reactive sites, but also improve the separation efficiency of photogenerated carriers during photodegradation. In addition, the degradation rate of RhB solution catalyzed by 25 wt% N-doped g-C 3 N 4 /NH 2 -MIL-125(Ti) (25 wt% NCM) attains the highest degradation rate (96.4%) under visible light irradiation. Moreover, the mineralization of RhB solution and intermediates produced in the degradation process are analyzed by total organic carbon (TOC) and high- performance liquid chromatography (HPLC) tests, respectively. Electron paramagnetic resonance (EPR) with free radical capture measurements show that the photodegradation of RhB is mainly ascribed to the superoxide radicals (·O 2 - ) and hole (h + ). This study provides an effective method to construct S-scheme heterojunction photocatalysts and apply them to wastewater treatment.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sheng Pang,Liangwei Cong,Youpeng Xu,Yiwei Sun,Dong Wang,Guoyu Qian,Zhi Wang
Typically, the X-ray diffraction spectrum of a highly oriented structure (HOS) MAX phase displays a prominent (002) characteristic peak. Surprisingly, this principle does not hold true for Ti 2 SC. Instead, the synthesized Ti 2 SC consistently exhibits a polyhedral structure (PS). Furthermore, even with hot-pressing sintering, the purity of Ti 2 SC remains relatively low. The primary factors contributing to anomalous crystal structures and low purity are insufficient crystal growth and limited reactant contact. In this study, we successfully achieved dual regulation of the crystal structure and purity of Ti 2 SC within the Ti/TiC/FeS 2 system, which was accomplished by enhancing reactant contact and controlling the growth rates of crystal planes. Notably, the intermediate products FeS and Fe, existing in a liquid phase at varying temperatures, played a crucial role in both the formation of Ti 2 SC and the growth of Ti 2 SC crystals. As a result, PS-Ti 2 SC and HOS–Ti 2 SC with purity greater than 99 wt% were successfully prepared. The formation of PS-Ti 2 SC can be attributed to the inadequate growth of each crystal plane at relatively lower temperatures (1500 °C). While the synthesis of HOS–Ti 2 SC necessitates the utilization of both a liquid phase and high temperature, as the epitaxial growth mechanism followed by vertical growth has been demonstrated to facilitate the generation of highly oriented crystals. The liquid phase facilitates the swift growth of Ti 2 SC crystals along the (001) crystal plane, while the (002) crystal plane necessitates a higher temperature (1760 °C) for relatively rapid growth. This work will open a new pathway for the development of the MAX phase from the perspective of crystal structure regulation and high purification preparation.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-10
·
IF 6.232
Zhen Deshuai,Shi Sisi,Gao Chan,Kang Qing,Xiao Xilin,Grimes Craig A.,Cai Qingyun
Bi, Fe, and Ti ternary co-doped ZrO 2 (BFT-ZrO 2 ) nanocomposites have been prepared by a sol-gel process and used as both adsorbent and matrix for the enrichment and determination of small molecules by surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF MS). The BFT-ZrO 2 nanocomposites not only can selectively enrich a wide variety of low-mass toxic pollutants but can also be used as an excellent matrix to enhance the laser desorption/ionization efficiency with low background noise and uniform co-crystalline film. Low limits of detection (LODs) (0.1 pg mL −1 for bisphenol A (BPA), 2 pg mL −1 for tetrabromobisphenol A (TBBPA), 0.1 pg mL −1 for alizarin (AZ), 0.001 pg mL −1 for bisphenol S (BPS), 0.01 pg mL −1 for indigo blue (ID), 0.01 pg mL −1 for pentachlorophenol (PCP), 100 pg mL −1 for estradiol (E2), 0.001 pg mL −1 for cetyltrimethylammonium bromide (CTAB), 0.1 pg mL −1 for crystal violet (CV), 1 pg mL −1 for malachite green (MG), 0.01 pg mL −1 for rhodamine B (RhB), and 0.01 pg mL −1 for perfluorooctane sulfonate (PFOS) were achieved. The relative standard deviations (RSDs) of shot-to-shot are 9.4–24% and of sample-to-sample 5.2–17%. The BFT-ZrO 2 matrix was successfully applied to the determination of TBBPA and BPA in tea samples. This method shows a new strategy for determination of toxic compounds in tea.
Graphical abstract
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DOI
PubMed
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Yi Yu,Fanfan Li,Zhouxuan Zang,Li Xu,Guoji Liu
Catalytic oxidation of 2-methylnaphthalene to 2-methyl-1,4-naphthoquinone (vitamin K 3 ) is a significant pathway to produce vitamin groups K. High pollution and low-productivity of the traditional method require a greener catalyst and process. In this work, Al/Ti-SBA-15 with different n Si /n Al and n Si /n Ti ratios were hydrothermally prepared in mild acidic condition and tested in partial oxidation of 2-methylnaphthalene. Commercial zeolites NaY, β and ZSM-5 were applied to investigate the influence of mass transfer resistance and acidity on catalytic performance. Catalysts were characterized by XRD, N 2 adsorption-desorption, TEM, NH 3 -TPD, FTIR and Py -FTIR. We have found that the 2-methylnaphthalene conversion and vitamin K 3 selectivity depend strongly on the mesoporous structure as well as Brönsted acid concentration and strength. Irregular micropores and strong acidity will accelerate the cleavage of C = C in aromatic rings, leading to the production of phthalic anhydride. DFT calculation reveals that incorporation of aluminum in SBA-15 can reduce the energy gap, facilitating the electron transfer. And as a consequence of the substitution of Al in tetrahedral positions in SBA-15, Al-SBA-15 (10) gives the best result with 72% yield to vitamin K 3 . This catalyst markedly reduces the activation energy due to the modified activated center. Repeated experiments recommend that Al-SBA-15 is a steady and high-efficiency catalyst for the production of vitamin K 3 .
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Huizhen Deng,Juanjuan Yin,Jinming Ma,Jingxin Zhou,Lexin Zhang,Lili Gao,Tifeng Jiao
A novel catalyst composed of Ag 3 PO 4 bridged by Ni/Ti LDH-graphene heterojunction structure was successfully prepared by a simple in-situ deposition method, which has excellent catalytic performance for 4-NP and 2-NA. Various characterizations to the samples such as XRD, SEM, TEM, STEM-EDS, XPS, TG–DSC, and UV–vis DRS were adopted. Because the ternary structure is mixed with each other to form more heterojunctions and higher specific surface area, the ternary composite Ag 3 PO 4 /Ni-Ti LDH/GO has excellent catalytic and cycle performance. Compared to the precursors Ag 3 PO 4 /GO and Ni-Ti LDH/GO, the finally as-obtained nanocomposite Ag 3 PO 4 /Ni-Ti LDH/GO degraded 4-NP and 2-NA solutions represented more dominant degradation efficiency. In addition, the pseudo-first-order rate constants of the composite catalyst for 4-NP and 2-NA are 0.178 min −1 and 0.089 min −1 , respectively. The complex and irregular surfaces of Ni-Ti LDH/GO provided an ideal carrier with abundant active sites for in-situ depositing and stabilizing of Ag 3 PO 4 NPs, formed the Ag 3 PO 4 /Ni-Ti LDH/GO hybrid possessed an acceptable catalytic performance on the degradation of azo dyes, which could be applied in the efficient treatment of wastewater from industries.
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