Materials Today Chemistry
·
2025
·
IF 6.7
Yuansen Xiao,Huimin Li,Zheng Wang,Zhihan Liu,Chenyang Li,Bin Wu,Longfei Yan,Huidong Zheng,Fuweng Zhang
Borneol synthesis faces challenges from co-generated impurities (isoborneol/camphor) and competing dehydration/dehydrogenation during isomerization. Here, Co/TiO 2 is demonstrated as a selective catalyst for isoborneol-to-borneol isomerization, effectively suppressing structural degradation. Controlled acidity and cobalt dispersion are identified as critical factors: TiO 2 's moderate acidity promotes isomerization, while strongly acidic supports (e.g., Mordenite) favor dehydration to camphene. Reduced cobalt particle size enhances active-site accessibility, lowering activation energy and boosting borneol yield. A one-pot two-step process achieves >62 % borneol content with <0.5 % camphor, meeting ChPC purity standards. This strategy bypasses traditional purification bottlenecks, offering a scalable route for high-purity borneol synthesis. The mechanistic insights into acid strength and metal dispersion provide a framework for rational catalyst design in industrial isomerization applications.
研究领域:
催化
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有机化学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2017
·Vol. 24
·期 5
·1227-1235
·
IF 1.624
Su Huanhuan,Lv Xiang,Zhang Zhengyi,Yu Jiajie,Wang Tianhe
Fe 2 O 3 –TiO 2 porous ceramic (Fe/TiPC) beads with photo-catalytic performances and high adsorption capacities were prepared by a simple high temperature solid reaction and were applied for arsenic removal from drinking water. The microstructure and morphology of Fe/TiPC were characterized by X-ray diffraction and scanning electron microscopy. More than 90% removal ratio for As (III) and As (V) were respectively achieved by Fe/TiPC within 2 h under UV irradiation. The Langmuir capacity values of Fe/TiPC for As (III) and As (V) were 13.86 and 15.73 mg/g, respectively. In addition, Fe/TiPC could be reused for up to five times without significant reduction in the photocatalytic sensitivity and adsorption capacity aspects. Good catalytic oxidation performances and high adsorption capacities as well as a sample preparation for Fe/TiPC suggest that the composites may have practical prospects for the As (III) and As (V) removal from contaminated water.
研究领域:
环境科学
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材料科学
·
水处理
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Lili Yang,Yusi Peng,Yong Yang,Jianjun Liu,Zhiyuan Li,Yunfeng Ma,Zhang Zhang,Yuquan Wei,Shuai Li,Zhengren Huang,Nguyen Viet Long
Hydrogenation was discovered to be an effective method to improve the surfaced-enhanced Raman scattering (SERS) performance of semiconductor TiO2 and enhance its enhancement factor (EF) by at least 3 orders of magnitude. The TiO2 substrate hydrogenated for 3 h showed the most remarkable SERS activity with a detection limit of 1 × 10–7 M for R6G and an EF of 1.20 × 106, which can be comparable to the Ag substrate. The remarkable SERS activities can be attributed to the chemical enhancement mechanism dominated by the enhanced photoinduced charge transfer (PICT) process between R6G and the oxygen vacancy-containing partly amorphous black TiO2 NWs substrate, as well as the electromagnetic enhancement (EM) derived from the metal-like local surface plasma resonance (LSPR) of the hydrogenated randomly oriented TiO2 nanowires. The first principle based on the density functional theory has been applied to demonstrate the appearance of tailed electron energy state produced by hydrogenation and provide the reasonable explanation for an easier PICT process, a stronger light absorption, and the enhanced SERS performance of our hydrogenated TiO2 substrates. Another impressive fact was that the photodegradation capability of TiO2 was also evidently improved. After 14 cycles of detection-and-degradation of R6G molecules, the substrates can still maintain regenerative and remarkable SERS activity. Ultrasensitive SERS activity and self-cleaning performance were successfully integrated on the black TiO2 NWs substrate by hydrogenation. Moreover, our substrate exhibited the excellent signal reproducibility and the outstanding stability of antioxidation in atmosphere thanks to the protection of the surface amorphous layer.
研究领域:
材料科学
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光催化
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分析化学
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产品关联
DOI
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Fengquan Gao,Yong Yang,Tianhe Wang
TiO 2 /Ag nanostructured porous films were prepared by spin coating of P25 TiO 2 /colloidal silica on glass substrate and subsequent photochemical deposition of silver nanoparticles (AgNPs). The adhesion strength of the film on glass substrate was evaluated and the result indicated that porous films formed on the glass substrates were robust and durable. The porous structure of TiO 2 /SiO 2 film facilitated the implantation of uniformly dispersed AgNPs having sizes generally less than 10 nm. By acting as electron scavengers, AgNPs effectively provided an alternative electron transfer route, thus enhancing the photocatalytic efficiency for degradation of methylene blue (MB). Compared with the bare TiO 2 film derived from P25, TiO 2 /Ag porous films showed an improved photocatalytic activity. This conclusion was further supported by photocurrent density measurements on the films. The study also demonstrated experimentally that TiO 2 /Ag porous films had sustained stability with the photocatalysis maintaining its original activity after at least four consecutive reaction cycles.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 5
·3009-3023
·
IF 3.9
Jia-Qi Li,Qing-Meng Zhao,Yong-Dong Zhou,Zong-Yan Zhao
Effective separation and fast transport of photogenerated carriers are vital links determining the photocatalytic performance. Heterostructure constructed by two complementary semiconductors is a feasible strategy to achieve this goal. By one-pot hydrothermal method, 0D-TiO 2 nanoparticles are loaded onto 2D-CuGaO 2 nanosheets, forming a mixed dimension, closely combined heterostructure. The photocurrent density of CuGaO 2 /TiO 2 heterostructure is ∼16.6 μA/cm 2 , which is 1.24 times higher than that of pristine CuGaO 2 nanosheets (∼13.4 μA/cm 2 ) and 15 times higher than that of TiO 2 (∼1.1 μA/cm 2 ). In the tetracycline hydrochloride degradation experiment, the degradation efficiency of tetracycline hydrochloride by CuGaO 2 /TiO 2 heterostructure reached 99% within 90 min, which was 1.2 times the degradation efficiency of CuGaO 2 nanoparticles (82%) and 20.2 times the degradation rate of TiO 2 (4.9%). A series of experimental characterizations combined with density functional theory calculations revealed that it is the built-in electric field in the CuGaO 2 /TiO 2 interface region that drives the photogenerated electron–hole pairs to travel in the opposite direction, thus inhibiting their recombination. Furthermore, the energy band offset of the CuGaO 2 /TiO 2 interface makes it easier for the photogenerated holes and electrons to gather onto the valence band of the CuGaO 2 nanosheets and the conduction band of the TiO 2 nanoparticles, respectively. Therefore, appropriate interface lattice matching, suitable configuration of band gap and band edge positions, and strong opposite drive of interface electric field enable CuGaO 2 /TiO 2 heterostructure to achieve wide spectral response and effective separation of photogenerated electron–hole pairs at the same time.
研究领域:
材料科学
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环境科学
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理论计算化学
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产品关联
DOI
高影响因子
Micro & Nano Letters
·
2020
·Vol. 15
·期 8
·535-539
·
IF 0.975
Hongguang Zhang,Meng Wang,Feng Xu
Developing cheap photocatalysts with highly visible-light activity is greatly desired for environmental pollution treatment. In this work, the authors designed and synthesised Cu 2+ -doped TiO 2 (Cu-TiO 2 ) hollow spheres with enhanced photocatalytic activity and antimicrobial activity using a simple hydrothermal process. The X-ray powder diffraction (XRD) results revealed that Cu-TiO 2 hollow spheres were anatase crystal phase. The Cu 2+ -doped into TiO 2 can be confirmed by XRD, Raman spectra, and UV–Vis spectrum. The photocatalytic activity of Cu-TiO 2 samples was evaluated by the degradation of methyl orange. Comparing to the undoped TiO 2 , 6% Cu-TiO 2 sample exhibited remarkably high photocatalytic towards methyl orange under simulated sunlight irradiation, which was attributed to the fact that copper ion doping produced numerous oxygen vacancies (V O ) in the material. In addition, it also showed improved antibacterial properties against both Gram-positive Staphylococcus aureus ( S.aureus ) and Gram-negative Escherichia coli ( E.coli ) bacteria. These results establish that Cu 2+ doping can obviously improve the photocatalytic performance of TiO 2 under simulated sunlight.
研究领域:
材料科学
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环境科学
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微生物学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Juan Wang,Aoxiong He,Hao Li,Yi Yang,Zhengguang Wen,Yutong Wang,Zixue Shao,Yuan Chen,Jan-Michael Albina
The development of high-performance lithium-ion battery (LIB) anode materials is essential for addressing growing energy demands. Traditional graphite anodes, limited by a theoretical capacity of 372 mAh/g. In this study, we synthesized core-shell TiO 2 @Mn 2 O 3 microspheres by coating Mn 2 O 3 onto anatase TiO 2 microspheres. The TiO 2 @Mn 2 O 3 anode exhibited an increased specific capacity of 486 mAh/g after 100 cycles and retained 204.8 mAh/g even after 500 cycles at a current density of 2 C. Furthermore, first-principles calculations revealed that the TiO 2 @Mn 2 O 3 heterostructure narrowed the band gap, improved electronic conductivity, and enhanced lithium-ion storage and transport properties. The synergistic effects between TiO 2 and Mn 2 O 3 contributed to superior cycling stability, higher capacity retention, and enhanced rate capabilities. Our work establishes a promising strategy for developing high-capacity, durable anode materials to advance the performance of next-generation LIBs, catering to the ever-growing demand for efficient energy storage solutions.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Zhengjiang Liu,Dan Zhou,Huiyan Ma,Lei Xing,Qiancheng Zhang,Juming Liu
SO 4 2− /CeO 2 /TiO 2 composite oxides are successfully fabricated via sol-gel method and impregnation process for photocatalytic H 2 production. The characterization results from XRD, FTIR and TEM revealed that the heterojunctions were formed by the formation of Ti-O-Ce bond across the SO 4 2− /CeO 2 /TiO 2 interface, which was contributed significantly to separation of photo-generated carriers. Py-FTIR spectra and XPS results indicated that Lewis acid and Brønsted acid sites were formed over the surface of SO 4 2− /CeO 2 /TiO 2 composite, which was owing to SO 4 2− coordinated to the metal on the sample surface. The induced Lewis acid sites could enhance the separation of photogenerated carriers, and Brønsted acid sites could provide protons for photocatalytic H 2 production. In addition, the Lewis acidity could facilitate the shift of conduction band minimum to a more negative value, which improves the photocatalytic H 2 production capacity of SO 4 2− /CeO 2 /TiO 2 . The results of photocatalytic H 2 production revealed that SO 4 2− /CeO 2 /TiO 2 composite exhibits superior photocatalytic activity compared to bare CeO 2 , TiO 2 and CeO 2 -TiO 2 composite. Notably, it achieves the average H 2 yield rate of 6295.2 μmol· g −1 h −1 over a period of 5 h. Combine the results of spectra analysis and photocatalytic activity H 2 evolution, it can be concluded that the synergetic effects of heterojunction structure of CeO 2 /TiO 2 composite and acid impregnation promoted the photocatalyst activity.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Limin Guo,Runze Hu,Caifu Zhong,Xinxin Wang,Jiaming Liu,Xiaohui Wang
An elegant templating method has been developed for the rational design and synthesis of hierarchical SnS 2 nanoclusters composed of ultrathin nanosheets and embedded inside TiO 2 nanoporous arrays. Herein, benefiting from their unique structural merits and metal-like plasmonic activity, the TiO 2 @SnS 2 heterostructures exhibit enhanced photocatalytic H 2 evolution properties in terms of good cycling performance. S vacancies and N-doping are proved to be vitally important to the electronic structures and bandgap of SnS 2 , thus influence the plasmonic property and separation of photo-carriers. The optimized TiO 2 @6nmSnS 2 /N nanoporous arrays give an ultra-high H 2 yield rate of 285 μmol h −1 cm −2 under a low catalyst loading mass, that comparable to most noble metal catalysts . Remarkable cycling performance with a capability retention of 90% is achieved after 30 h under solar light illumination. As an innovative exploration, this study demonstrates that the photocatalytic activities of nonmetal, earth-abundant SnS 2 can be enhanced with plasmonic effect, which may serve as an excellent catalytic agent for solar energy conversion to chemical fuel.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Xu,Zhiwen He,Shuili Yu,Lei Li,Luyang Cai,Peng Yi
Recently, the heterogeneous advanced reduction processes (ARPs) for bromate (BrO 3 - ) degradation have attracted considerable attention due to its stable performance and easy combination with UV disinfection. In this study, a UV/TiO 2 -Bi advanced reduction process (ARP) was established for BrO 3 - removal without adding external sacrificial agents. In the UV/TiO 2 -Bi ARP, Bi nanoparticles (NPs) doped on the TiO 2 acted as hole trapping centers, while TiO 2 NPs were used as reduction centers for the reduction of BrO 3 - , which enhanced the charge carrier separation. The UV/TiO 2 -Bi-1% ARP exhibited the highest BrO 3 - removal rate without the addition of sacrificial agents in the reaction solution compared to UV/TiO 2 ARP and the UV/TiO 2 -Bi ARP at other Bi/Ti ratios. The result of 72% removal of 200 µg/L BrO 3 - at 60 min by 0.2 g/L TiO 2 -Bi-1% in tap water at pH 6.8 and 7.71 mg/L dissolved oxygen (DO) demonstrates the promising potential of the UV/TiO 2 -Bi ARP for the removal of BrO 3 - in practical applications. Compared to the 99.5% removal in deionized (DI) water at 60 min, lower BrO 3 - reduction in tap water was likely attributed to the consumption of photo-generated electrons by NO 3 – and the adsorption of natural organic matter on the surface of TiO 2 -Bi-1% nanocomposites. The study provides not only a novel BrO 3 - removal system with good photo-reduction performance, but also some guidance for the influence of constituents in raw water on the treatment of BrO 3 - .
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2018
·Vol. 5
·期 4
·045051
·
IF 1.151
Shuai Mao,Rui Bao,Dong Fang,Jianhong Yi
Amorphous-TiO2/Cu2Cl(OH)3 (am-TiO2/Cu2Cl(OH)3) composite photocatalyst was synthesized by a facile and novel spray pyrolysis method. The morphology, crystal structure, chemical composition, optical properties, and photocatalytic activity of the composite were characterized and investigated. It was noted that heating temperature played a fundamental role in determining the morphology of the composite photocatalyst as well as the crystallinity of TiO2. Am-TiO2 was firmly anchored on Cu2Cl(OH)3 with well dispersibility and served as the main sunlight absorber. Meanwhile, Cu2Cl(OH)3 acted as not only a carrier, but also a chemical catalyst of H2O2 to produce O2 (electron acceptor). Compared with commercially available P25 specie, the composite with the addition of H2O2 exhibited higher photocatalytic performances for methyl orange (MO) degradation under simulated solar light irradiation. By considering the mechanism, the excellent performance was awarded to uniform dispersion of am-TiO2 in the unique Cu2Cl(OH)3 and superfluous electron acceptor.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 39
·395602
·
IF 3.551
Hongchao Geng,Ning Jiang,Chenyi Li,Xingqi Zhu,Yan Qiao,Qingyun Cai
A novel visible light-driven photocatalyst (represented as Mn-CdS/ZCISe/CIS/TiO2) for the passivation of E. coli was prepared with TiO2 nanowires as support and using CuInS2 (CIS) and ZnCuInSe (ZCISe) quantum dots (QDs), as well as Mn-doped CdS (Mn-CdS) nanoparticles (NPs) as sensitizers. The use of CIS and ZCISe QDs and Mn-CdS NPs extends the light harvest region to visible light. The photoelectric conversion efficiency was consequently improved, with a photocurrent density of 12.5 mA cm−2, about 60 times that of pure TiO2 nanowires. The germicidal efficiency of the photocatalyst was assessed by passivation of E. coli, 96% bacteria in 50 ml 105 colony forming units (CFU) ml−1 solution were killed within 50 min. Besides the high efficiency, the composite has good stability and satisfactory recycling performance. The antibiotic mechanism was also performed by using photoluminescence and a scavenging agent of different active matter, revealing that the photo-generated holes play a major role in the sterilization process.
研究领域:
微生物学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）