TRIBOLOGY INTERNATIONAL
·
2018
·
IF 3.246
Ziyan Lu,Zhenzhen Cao,Enzhu Hu,Kunhong Hu,Xianguo Hu
A method was developed to prepare WS 2 and WS 2 /TiO 2 nanoparticles . A blue tungsten oxide precursor was synthesized from Na 2 WO 4 , CH 3 CSNH 2 , and HCl. WS 2 nanoplatelets was produced after sulfurizing the precursor at 300 °C. Nano-TiO 2 could be activated by HCl and provide active sites for the deposition of the precursor to produce WS 2 /TiO 2 nanoparticles after sulfurization. The as-prepared two nano-additives slightly affected the friction reduction of diisooctyl sebacate (DOS), but they, especially WS 2 /TiO 2 , remarkably improved the wear resistance of DOS. Compared with the pure DOS, the 0.75% WS 2 /TiO 2 -containing DOS decreased the wear volume by ∼81%. The anti-wear performance of WS 2 /TiO 2 is ascribed to the formation of a lubricating film and the synergistic lubrication effect of WS 2 and TiO 2 .
研究领域:
材料科学
·
摩擦学
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产品关联
DOI
高影响因子
Colloid and Interface Science Communications
·
2021
·
IF 4.914
Xueqin Wang,Helong Xu,Xiaohang Luo,Ming Li,Man Dai,Qihui Chen,Hua Song
Herein, CeO 2 /TiO 2 heterostructures are synthesized adopt a simple and profitable sol-gel technique. The nanostructures comprised of ultrafine and well-distributed CeO 2 nanoparticles on the TiO 2 surface. The obtained catalysts were characterized via X-ray diffraction, nitrogen adsorption , Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy , photoluminescence spectroscopy, and ultraviolet (UV)-visible spectroscopy tests. The as-prepared heterostructures exhibited a visibly enhanced photodegradation performance using phenol(38 ppm) as the model of organic pollutants . The achieved degradation efficiency was 99.1% under UV-light irradiation for 120 min and the TOC removal was 81.31% when using CeO 2 /TiO 2 as catalyst with the CeO 2 loading of 0.5%. The enhanced property was ascribed to the formation of a heterojunction after coupling CeO 2 with TiO 2 , which could capture the phenol molecules and improve the adsorption properties of the materials. Meanwhile, the heterostructures inhibited photogenic carriers recombination, thereby extending the optical response range. Furthermore, the as-prepared catalysts possessed favorable cycle performances and were reutilized for four cycles with insignificantly reduced property, the degradation rate were decreased slightly to 94.0% with a inappreciable decline in Ce and Ti leaching, suggesting it's preeminent stability and recyclability in the process of photocatalytic .
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Chunhong Gao,Jinjia Liu,Meilin Jia,Gala Sa,Aiju Xu
Photocatalytic technology has broad prospects in the degradation of organic pollutants due to its green, energy-saving and high-efficiency characteristics. In this study, TiO 2 and V–TiO 2 were prepared by hydrothermal method , and the catalysts were tested by experimental and theoretical calculations under a 400 W metal halide lamp degradation efficiency for aniline (30 mg/L). The synthetic photocatalysts were characterized by XRD , HRTEM , FT-IR, XPS , UV–Vis DRS , PL , EIS , and photocurrent , the results showed that the edges of the V-doped TiO 2 absorption band were redshifted, the band gap value were reduced, the photocatalytic activity were improved, and the PL showed e − /h + had the lowest composite rate for 1.5 mol%V–TiO 2 and broadens the optical response range. 1.5 mol% V was the optimal value for photodegrading aniline, and moderate V modification can significantly inhibit the complexation of e − /h + pairs. Finally, stability measurements performed over 5 cycles show that 1.5 mol%V–TiO 2 has excellent stability. The calculation results show that the optical band gap of V–TiO 2 were significantly reduced, the photocatalytic performance of V–TiO 2 were greatly enhanced.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Chengzhuo Yu,Jin Xu,Li Xiong,Yarui Wang,Silong Wang,Fanglan Geng,Zesen Shang,Huasheng Wu,Lixia Zhao,Yawei Wang
Luminol-based chemiluminescence (CL) systems, as a powerful tool for bioanalysis, are limited owing to their weak CL intensity and self-decomposition of the classic oxidant H2O2. Herein, we introduced a new luminol CL enhancer, the natural light-driven photocatalyst MIL-100(Fe)/TiO2, for the selective determination of dopamine (DA). By employing MIL-100(Fe)/TiO2 for the first time as an efficient enhancer, the MIL-100(Fe)/TiO2-luminol CL intensity was 100 times higher than that of the classical H2O2-luminol system. The CL spectrum, UV–vis absorption spectroscopy, radical scavenger experiments, and electron spin resonance spectroscopy were utilized to investigate the possible CL mechanism of the MIL-100(Fe)/TiO2-luminol system. All of the results indicated that MIL-100(Fe)/TiO2 can generate reactive oxygen species under mild natural light, which could react rapidly with the luminol anion radical and result in direct CL emission. The sensitive plate for DA was developed based on its inhibiting effect on CL intensity, and the linear range between CL intensity and DA concentration was 100 nM–1000 μM with a detection limit of 16.7 μM (S/N = 3). This study successfully achieved a stable reactant that can directly trigger the CL of luminol without the need for additional oxidizing agents under mild natural light and offers new possibilities for photoinduced amplification technology.
研究领域:
分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
SENSORS
·
2024
·Vol. 24
·期 13
·4142
·
IF 3.4
Ling Zhang,Chu Chen,Hongyan Zhang
TiO2is a typical semiconductor material, and it has attracted much attention in the field of humidity sensors. Doping is an efficient way to enhance the humidity response of TiO2. Eu-doped TiO2material was investigated in both theoretical simulations and experiments. In a simulation based on density functional theory, a doped Eu atom can increase the performance of humidity sensors by producing more oxygen vacancies than undoped TiO2. In these experiments, Eu-doped TiO2nanorods were prepared by hydrothermal synthesis, and the results also confirm the theoretical prediction. When the doping mole ratio is 5 mol%, the response of the humidity sensor reaches 23,997.0, the wet hysteresis is 2.3% and the response/recovery time is 3/13.1 s. This study not only improves the basis for preparation of high-performance TiO2humidity sensors, but also fills the research gap on rare earth Eu-doped TiO2as a humidity-sensitive material.
研究领域:
材料科学
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半导体技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ping Li,Huanhuan Wu,Chengming Zhang,Quangui Liang,Huihui Ding,Haibao Zhu,Jun Ma,Xiang Li,Shuangshuang Huai,Congliang Cheng,Xiufang Wang
The lack of active sites and the low availability of photoelectrons severely limit the photocatalytic reduction of nitrogen to ammonia in semiconductor materials. Here, we successfully designed a BiOBr/O v -TiO 2 -Cu heterojunction catalyst toward N 2 fixation into NH 3 . The optimized BiOBr/O v -TiO 2 -Cu heterojunction has a promising photocatalytic performance and stability with the highest NH 3 yield of 259.82 μmol·g −1 ·h −1 . The combination of detailed theoretical simulation calculations and comprehensive characterizations indicates the BiOBr/O v -TiO 2 -Cu heterojunction with oxygen vacancy (O v ) stabilized Cu nanoparticles (NPs) as active sites can effectively adsorb and activate N 2 molecules. The close contact between BiOBr and Ov-TiO 2 elevates the quick transmission of photogenerated electrons at the interface and the enrichment on Cu NPs. This work not only provides an efficient photocatalyst for the N 2 reduction, but also supplies theoretical support for identifying the active sites and charge transfer kinetics of the nitrogen reduction reaction.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 24
·5981
·
IF 4.2
Lizhe Ma,Zhiyong Fang,Jieli Duan,Jin Li,Kefu Zhu,Yinlong Jiang,Bang Ji,Zhou Yang
TiO2has broad prospects in reducing the safety risks posed by emerging pollutants in water environments. However, the high recombination rate of photogenerated carriers limits the activity and photon utilization efficiency of TiO2. In this study, mesoporous TiO2(m-TiO2) and ultra-thin g-C3N4nanosheets were composited using a hydrothermal method, with the m-TiO2tightly and uniformly wrapped by g-C3N4. The chemical structure, elemental composition, and optical properties of the heterojunction were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis-DRS). The activity of the m-TiO2@g-C3N4was evaluated by the degradation of tetracycline hydrochloride (TCH). Results showed that the heterojunction exhibited significantly enhanced reactivity compared to pure m-TiO2and g-C3N4, with kinetic rates of TCH being 1.48 and 6.84 times that of pure m-TiO2and g-C3N4, respectively. The TCH degradation kinetic rate varied from 0.194 min−1to 0.026 min−1and then decreased to 0.015 min−1on the scale of the bandgap and the number of absorbed photons in m-TiO2@g-C3N4. Concurrently, a 10wt% doping amount of g-C3N4significantly increased the reaction rate of photogenerated carriers in the system compared to the recombination rate, corresponding to excellent photon efficiency. Reproducibility was evaluated, and a possible degradation mechanism is proposed. This study opens new perspectives for the optimization of catalyst preparation processes aimed at enhancing photon efficiency.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 76
·72659-72669
·
IF 3.289
Chao Li,Weiyi Yang,Lingmei Liu,Wuzhu Sun,Qi Li
Plasmonic photocatalysis could provide a promising solution to the two fundamental problems of current TiO2-based visible-light photocatalysis on low photocatalytic efficiency and low usage of solar illumination. But till now, most plasmonic photocatalysts have relied on noble metal nanostructures of Au or Ag due to their easy synthesis and efficient absorption of visible light. In this study, a TiN/TiO2 nanocomposite photocatalyst was synthesized by the in situ growth of TiO2 nanoparticles on TiN nanoparticles with a fluorine-free, vapor-phase hydrothermal process. In this composite photocatalyst system, the desirable visible light absorption could be attributed to the LSPR effect of a nanostructured TiN phase. Thus, a plasmonic photocatalyst without noble-metal components was developed, and its good visible light photocatalytic activity was demonstrated by both the photodegradation of organic pollutants of RhB and 4-NP and the disinfection of microorganisms of E. coli. From the energy alignment analysis, hot electrons were expected to be completely injected from TiN to TiO2 once they were excited above the Fermi energy level of TiN because no barrier existed, resulting in better electron injection efficiency than previous reported noble-metal-based plasmonic photocatalysts.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 97
·期 5
·1267-1274
·
IF 3.174
Ganning Zeng,Chunxian Hong,Yuan Ma,Mingming Du,Yan Zhang,Hongwei Luo,Bing Chen,Xiangliang Pan
BACKGROUND During the past two decades, aquatic polycyclic aromatic hydrocarbon (PAH) contamination has gained more and more attention, because of carcinogenicity or mutagenicity, toxicity, persistence and bioaccumulation, and a huge threat posed to entire ecosystems. RESULTS Sargassum horneri ( SH )-based carbon was pretreated with ethanol and formaldehyde, and obtained after pre-carbonization using H 2 SO 4 . The SH carbon powder was used to immobilize nano-TiO 2 in aquatic environment by a facile sol–gel method. The resulting C/TiO 2 catalyst was applied to photocatalytic aquatic naphthalene degradation under sunlight and showed the best naphthalene degradation performance of 83.77% under simulated sunlight, which could be attributed to the shape and structure contribution originating from SH . C/TiO 2 served as both adsorbent and catalyst in the degradation process of naphthalene, and the photodegradation process conformed to a double-exponential kinetic model, indicating that there are physical and chemical processes involved in the degradation. The mechanism for enhanced photocatalytic activity was verified as a synergistic mechanism resulting from SH -based carbon and TiO 2 , and showed industrial potential for removal aquatic PAH pollutants. CONCLUSIONS This study verifies that the synergistic effect resulting from SH -based carbon and TiO 2 enhanced the photocatalytic performance. © 2021 Society of Chemical Industry (SCI).
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xinwei Li,Haiwei Li,Yu Huang,Junji Cao,Tingting Huang,Rong Li,Qian Zhang,Shun-cheng Lee,Wingkei Ho
To understand the conversion mechanism of photocatalytic gaseous formaldehyde (HCHO) degradation, strontium (Sr)-doped TiO 2– x –OV catalysts was designed and synthesized in this study, with comparable HCHO removal performance. Our results proved that foreign-element doping reduced Ti 4+ to the lower oxidation state Ti (4– x )+ , and that the internal charge kinetics was largely facilitated by the unbalanced electron distribution . Oxygen vacancies (OVs) were developed spontaneously to realize an electron-localized phenomenon in TiO 2– x –OV, thereby boosting O 2 adsorption and activation for the enhanced generation of reactive oxygen species (ROS). At the chemisorption stage, in-situ DRIFTS spectra and density functional theory calculation results revealed that surface adsorbed O 2 (O ads ) and lattice O (O lat ) engaged in the isomerisation of HCHO to dioxymethylene (DOM) on TiO 2– x –OV and TiO 2 , respectively. Time-resolved DRIFTS spectra under light irradiation revealed that the DOM was then converted to formate and thoroughly oxidized to CO 2 and H 2 O in TiO 2– x –OV. While bicarbonate byproducts were detected from DOM hydroxylation or possible side conversion of CO 2 in TiO 2 , owing to insufficient consumption of surface hydroxyl. Our study enhances the understanding on the photocatalytic oxidation of HCHO, thereby promoting the practical application in indoor air purification .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 2
·882
·
IF 4.6
Mingjun Wang,Che Li,Bingfang Liu,Wenzhen Qin,Yu Xie
Photocatalysis is a hopeful technology to solve various environmental problems, but it is still a technical task to produce large-scale photocatalysts in a simple and sustainable way. Here, nano-flower β-Bi2O3/TiO2composites were prepared via a facile solvothermal method, and the photocatalytic performances of β-Bi2O3/TiO2composites with different Bi/Ti molar ratios were studied. The nano-flower Bi2O3/TiO2composites were studied by SEM, XRD, XPS, BET, and PL. The PL result proved that the construction of staggered heterojunction enhanced the separation efficiency of carriers. The degradation RhB was applied to study the photocatalytic performances of prepared materials. The results showed that the degradation efficiency of RhB increased from 61.2% to 99.6% when the molar ratio of Bi/Ti was 2.1%. It is a mesoporous approach to enhance photocatalytic properties by forming heterojunction in Bi2O3/TiO2composites, which increases the separation efficiency of the generated carriers and improves photocatalytic properties. The photoactivity of the Bi2O3/TiO2has no evident changes after the fifth recovery, indicating that the Bi2O3/TiO2composite has distinguished stability.Keywords:Bi2O3/TiO2;heterojunction;photocatalysts;degradation RhB
研究领域:
环境科学
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材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiaoqi Jiang,Qing Li,Wenjie Xia,Zhiwei Huang,Xiaomin Wu,Huawang Zhao,Zhilei Guo,Weixin Kong,Chung-shin Yuan,Guohua Jing,Huazhen Shen
Elemental mercury (Hg 0 ) is the most difficult mercury species to remove from the flue gas. Photocatalysts of transition metal oxide modified TiO 2 can effectively remove Hg 0 . However, the metal oxide easily aggregates into large nanoparticles, reducing the atom utilization efficiency and photocatalytic activity. We presented a facile strategy of employing g-C 3 N 4 as an anchor to successfully load highly dispersed ultrasmall CeO 2 clusters on g-C 3 N 4 /TiO 2 . Moreover, the mechanism of anchoring CeO 2 clusters and charge transfer of the ternary photocatalyst were explored in-depth. The results demonstrated that at 250 °C, the photooxidation efficiency of Hg 0 by CeO 2 -g-C 3 N 4 /TiO 2 was several times higher than that of CeO 2 /TiO 2 , TiO 2 , and g-C 3 N 4 . The cavity of the tri-s-triazine ring anchored small CeO 2 clusters via strong Ce-N coordination bonds. A combined type II and Z-scheme transport paths accelerated the separation of photogenerated electron holes. This research offers valuable surface engineering strategy for highly dispersed ultrasmall cluster decorated TiO 2 .
研究领域:
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）