INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yan Yu,Na Zhong,Jincan Zheng,Shasha Tang,Xincheng Ye,Tao Zeng,Weiting Yu,Zhiqiao He,Shuang Song
Photoelectrocatalytic (PEC) water splitting provides an alternative to direct solar-to-fuel production. In this study, a novel heterostructure formed between a conjugated polymer [poly-2,6-diaminopyridine (PDAP)] and three-dimensional TiO 2 microspheres was grown in situ on a Ti substrate (PDAP-3DTiO 2 MSs/Ti) and used as photoanode for water oxidation in alkaline media under AM 1.5G illumination. The PDAP-3DTiO 2 MSs/Ti can produce applied bias photon-to-current efficiency of 0.85% at 0.44 V vs. Pt and a photocurrent density of 1.56 mA cm −2 at 1.23 V vs. RHE . Moreover, PDAP-3DTiO 2 MSs/Ti displays impressive photoelectrochemical stability with 93% of its initial photocurrent being retained after 4 h of reaction. Based on physical-chemical characterization and photo-/electro-chemical measurements, the superior PEC water splitting performance of PDAP-3DTiO 2 MSs/Ti should benefit from the coexistence of Ti 3+ and Ti 4+ in 3DTiO 2 MSs, the light harvest capability of PDAP and the type II heterojunction formed between 3DTiO 2 MSs and PDAP, which result in the enhanced generation and separation of photocarriers.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 21
·7060-7071
·
IF 6.119
Kaiyue Zhang,Guilong Lu,Feng Chu,Xiubing Huang
Thermo-enhanced photocatalysis has been reported as a potential strategy for improving the activity, whereas the relationship between thermal energy and the localized surface plasmon resonance (LSPR) effect of noble metal nanoparticles has been rarely investigated. Herein, photocatalytic selective aerobic oxidation of amines to imines is investigated under visible light irradiation over heterostructured TiO2(B)/anatase and Au/TiO2 nanobelts at specific temperatures (20–60 °C). The surface amine substrate complexed on TiO2 could broaden the visible-light absorption region via the ligand-to-metal charge transfer (LMCT) effect. Interestingly, the pristine TiO2 achieves the best photocatalytic performance (>99% benzylamine conversion and >99% N-benzylidenebenzylamine selectivity) at 60 °C after 12 h irradiation while the Au nanoparticles (NPs) are observed to improve the activity of TiO2 only in a low temperature range (<40 °C). Moreover, excessive Au NPs loaded on TiO2 could inhibit the amine conversion and reduce the imine selectivity in the whole temperature range of 20–60 °C, which is attributed to the decreased oxygen vacancies and poor amine adsorption ability on the surface of Au/TiO2. A plausible explanation is finally proposed that the substrate–TiO2 complex, instead of plasmonic Au NPs, plays a vital role in achieving good amine conversion and imine selectivity.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lingling Wang,Yunning Chen,Yuxin Zheng,Xueying Cheng,Jiawei Hao,Qingkun Shang
Eight composite photocatalysts were synthesized. Er- and Fe-doped TiO 2 photocatalysts were prepared first, and their photocatalytic performance for phenol degradation was investigated. Furthermore, three pyridine derivatives and 1,10-phenanthroline were bonded to Er-Fe-TiO 2 , which greatly improved the efficiency and rate of photocatalytic degradation of phenol and chlortetracycline hydrochloride. The absorption spectra, fluorescence spectra, photocurrent density, impedance spectra, and ESR radical measurements of eight different photocatalysts were investigated. On this basis, combined with a discussion on the matching of the molecular orbital energy levels of pyridine derivatives and 1,10-phenanthroline with the band gap of Er-Fe-TiO 2 , a possible mechanism of electron transport was proposed for the photocatalysis process. We studied the degradation of chlortetracycline hydrochloride or a mixture of phenol and four antibiotics using four composite photocatalysts. The possible degradation sites of chlortetracycline hydrochloride were predicted by theoretical calculations, and some results were consistent with those detected by HPLC-MS.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Chuanjin Lin,Guoquan Suo,Jiarong Li,Rongrong Mu,Laraib Habib,Xiaojiang Hou,Shukai Ding,Jianfeng Zhu
Water-induced deterioration poses a significant threat to sandstone cultural heritage, necessitating effective protective measures. This research investigates a fluorine dual-modified nanocomposite coating composed of nanoplate-like TiO 2 and nanoparticle SiO 2 , utilizing 1H, 1H, 2H, 2H-perfluorodecyl triethoxysilane as the modifier. The study aims to optimize the modifier concentration for enhanced hydrophobicity , while also assessing the coating’s penetration depth and its effect on sandstone breathability. An optimal formulation, consisting of a TiO 2 -to-SiO 2 mass ratio of 75:25 combined with 80 µL of the perfluorodecyl triethoxysilane modifier, yielded exceptional water and oil contact angles of 150.1° and 139.3°, respectively. Even after 210 h of UV exposure, the coating exhibited remarkable stability, with only a minor decrease in contact angles. Furthermore, the treatment effectively preserved the air permeability of the sandstone. This F-modified nanoplate TiO 2 /nanoparticle SiO 2 composite coating demonstrates significant potential for the long-term protection of sandstone cultural relics against environmental weathering, offering a balance of high hydrophobicity and breathability.
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产品关联
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chenhui Hu,Chunhong Liu,Kaimin Du,Chengkai Pang,Zuoxi Zhuo,Qiangsheng Gao
An energy-saving catalyst 4%Fe/Ce-Mn-TiO 2 was prepared via a simple one-step impregnation-annealing process and used as a denitration catalyst at low temperature (≤180 °C) and high water content (∼20%). The results show that 4%Fe/Ce-Mn-TiO 2 catalyst exhibits good low-temperature catalytic activity and water resistance attributed to its highly dispersed metal oxide species, more surface-adsorbed oxygen and high stability of particles. The denitrification efficiencies of 4%Fe/Ce-Mn-TiO 2 catalyst are 90% (5% H 2 O) and 70% (20% H 2 O) at 170 ℃ respectively, which are superior to the commercial vanadium catalyst in service usually needs heating up to 220 ℃.
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CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Qi Zhang,Liangyun Yu,Bairen Yang,Chenchen Xu,Wang Zhang,Qi Xu,Guowang Diao
Herein, Fe 3 O 4 @Ru-doped TiO 2 photocatalyst was developed successfully by a facile chemical strategy. The sample with 0.2% doping Ru showed the best photocatalytic activity, which could photodegrade 70.20% of methylene blue after 120 min of simulated sunlight exposure, and kept good degradation efficiency and recovery after 5 cycles. It could be attributed that the Ru-doping alleviated the band gap energy to make the electron-hole pairs easier to generate and enhanced the synergistic effect to increase the carrier separation efficiency. The present work provided a development prospect of simple preparation of recoverable photodegradation catalyst for environmental organic pollutants.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2020
·
IF 4.006
Caiping Huang,Bangzhu Peng
A high-performance nitrogen-doped chitosan-TiO2 nanocomposite to be used as a photocatalyst for patulin degradation in apple juice was successfully prepared by a simple precipitation method. The structure and properties were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy (FT-IR), and UV–Vis diffuse reflectance spectrum. According to XPS and UV–Vis analyses, nitrogen had been successfully doped into the TiO2 nanoparticle crystals and reduced the band gap energy of TiO2 nanoparticles. The synthesized nanocomposite was able to photocatalytically degrade the patulin in apple juice under ultraviolet irradiation. The patulin (500 μg/kg) was completely degraded within 35 min, which exhibited significantly enhanced photocatalytic activities compared with TiO2 nanoparticles or chitosan-TiO2 nanocomposite. Moreover, the photocatalytic treatment significantly reduced the occurrence of juice browning, and had little effects on reducing sugar, pH, titratable acid and soluble solids of the apple juice. The nitrogen-doped chitosan-TiO2 nanocomposite would be an ideal photocatalyst for patulin degradation in apple juice due to its high photocatalytic activity and little effects on the quality of apple juice.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qiuyu Feng,Biyuan Liu,Jian Ji,Kai Li,Boge Zhang,Haibao Huang
Traditional photocatalytic oxidation of volatile organic compounds (VOCs) suffers low oxidation and mineralization capability, the short lifetime of the lamps, etc. The usage of microwave discharge electrodeless lamps (MDELs) is an energetic approach to eliminate pollutants with lamps having a long lifetime. Herein, a novel MDELs-photocatalytic system using MnO x /TiO 2 /activated carbon (AC) as the photocatalyst was explored to degrade toluene. The system displayed a superior toluene removal efficiency (94%) and mineralization rate (91%), and there was nearly no ozone emission. Owing to the formation of MnTiO 3 , the photocatalytic degradation activity over MnO x /TiO 2 /AC was remarkably increased by producing more reactive oxygen species, such as O( 1 D) and OH · . MnO and MnTiO 3 in MnO x /TiO 2 /AC also promoted the decomposition of ozone to further degrade toluene via catalytic ozonation. Moreover, the excellent microwave absorbing property of MnO x /TiO 2 /AC increased the catalyst bed temperature to nearly 150 °C, accelerating the thermal decomposition of toluene due to the “hot spots” effect. The degradation mechanism was proposed tentatively. This work shed new light on the effective removal of VOCs using a novel MDELs photodegradation system over multi-functional catalysts.
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 6
·1-11
·
IF 2.8
Ji Xiaohong,Ji Wenhui,Pourhashem Sepideh,Wang Wei,Duan Jizhou,Hou Baorong
Core-shell nanofibers consisted of chitosan/polyvinyl alcohol as shell and TiO 2 /Ag nanoparticles as core (abbreviated as (TiO 2 @AgNPs)@(CS/PVA)) are synthesized by electrospinning method for improving the functional properties of the epoxy polymer coatings. The agglomeration of the core-shell network is prevented through fabrication on carbon steel surface. Meanwhile, the presence of unique amine and hydroxyl functional groups on the surface of the CS/PVA nanofibers would provide a crosslinking with the epoxy resin molecules with merits of reducing the gaps between epoxy coating and fillers and enhancing the blocking effect of the fibers. The electrochemical impedance spectroscopy reveals that the resistance of the epoxy coating loaded with the core-shell nanofibers is almost 3 times more than that of the blank sample during 30 days of soaking in the 3.5 wt% NaCl electrolyte. Moreover, the (TiO 2 @AgNPs)@(CS/PVA)/epoxy coating has shown high antibacterial activity against S. aureus with the highest antibacterial rate of 87% after 24 h storage in the solution of phosphate buffer salt. The developed core-shell nanofibers embedded within epoxy coating with enhanced anticorrosion and antibacterial properties could provide a promising application in various maritime fields for achieving both anticorrosion and antifouling properties in one coating system.
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RSC Advances
·
2017
·Vol. 7
·期 79
·50027-50034
·
IF 3.108
Huizhen Wang,Wenzhi Li,Jindong Wang,Hou-min Chang,Hasan Jameel,Qi Zhang,Song Li,Lele Jin
The solid, super, acid catalyst S2O82−/ZrO2–TiO2–SiO2, which has both a strong Brønsted acid and Lewis acid, was prepared and applied in lignin depolymerization. The results indicate that S2O82−/ZrO2–TiO2–SiO2 is an effective catalyst for lignin depolymerisation since the liquid product was almost completely dissolved in ethyl acetate, indicating that it was comprised of mostly oligomeric lignin degradation products. The effect of hydrogenation co-catalysts (Pd/C, Pt/C and Ru/C, Rh/C) were also studied and found to improve the yield of aromatic compounds and the petroleum ether soluble fraction, which are mostly monomeric and dimeric products. The resulting yields of aromatic compounds and petroleum ether soluble products were 14.8% and 46%, respectively, when S2O82−/ZrO2–TiO2–SiO2 and Pt/C mixed catalyst was used at 310 °C for 24 hours. These results show that the use of a combination Brønsted and Lewis acid catalyst in combination with a hydrogenation catalyst (S2O82−/ZrO2–TiO2–SiO2 together with a noble metal catalyst) opens a practical route for efficient lignin depolymerization.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jianhua Sha,Yunkai Sun,Haiyan Yu,Zitong Yang,Hongwei Chu,Yan Wang,Qinyan Yue,Weiyan Yin,Shiping Xu
To overcome the recovery challenge of nanoscale photocatalysts, great endeavor has been paid to explore effective nano-TiO 2 immobilization approaches, but comprehensive comparison between these methods is still lacking. Herein, four approaches, namely impregnation-calcination, sol-gel, solvothermal route and click chemistry strategy were fully compared to immobilize nano-TiO 2 onto biochar from the viewpoint of properties characterization, photocatalytic activity, structure stability and pollutant degradation pathway. It was found that, compared to other three methods, product obtained by click chemistry (CC-P25/BC) showed superior adsorption-photocatalysis synergy and persistent long-term stability. These superiorities were not attributed to pore structure, crystallinity or light absorption , but predominated by the robust chemical bonds between TiO 2 and biochar, which served as an effective internal channel for electrons transportation. Besides, with CC-P25/BC as photocatalyst, a unique self-acceleration period was observed during methylene orange (MO) degradation. Via investigating MO degradation pathway and solution environment, we found that it was the strong photocatalytic activity of CC-P25/BC that selectively accelerated MO demethylation, thus leading to solution pH drop and subsequent MO adsorption enhancement and then degradation acceleration. Thus, this study confirmed the superiority of click chemistry in nanoscale photocatalyst immobilization, and affirmed the importance of pollutant degradation process in governing its degradation rate.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Xiaofeng Cui,Guiyuan Jiang,Ming Zhu,Zhen Zhao,Luchao Du,Yuxiang Weng,Chunming Xu,Dekai Zhang,Quanlai Zhang,Yuechang Wei,Aijun Duan,Jian Liu,Jinsen Gao
Solar driven semiconductor photocatalytic water splitting to produce hydrogen is an extremely charming process by storing photon energy in chemical bonds. In the present study, composite semiconductor TiO 2 /CdS was structured into uniform and porous double-shelled hollow sphere with cocatalyst platinum selectively loaded onto the internal wall. The SEM, TEM , STEM , XRD , BET and EDS elemental distribution etc. were employed to evidence the formation of the targeted photocatalyst . It was demonstrated that the material has a high efficiency of visible-light-driven hydrogen evolution (296 μmol·h −1 /10 mg) with an apparent quantum efficiency (QE) of 14.5% at wavelength of 420 nm. Comparative experiment analysis and time-resolved infrared absorption study suggested that the high photocatalytic activity of the catalyst is attributed to the vectorial electron transfer (CdS → TiO 2 → Pt) and the spatial separation of reduction and oxidation active surfaces achieved by the special morphology.
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危险品化学品经营许可证（带存储）