ACS Applied Materials & Interfaces
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2013
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IF 5.008
Hui Zhang,Ronghua Shi,Anjian Xie,Juchuan Li,Long Chen,Ping Chen,Shikuo Li,Fangzhi Huang,Yuhua Shen
A novel inorganic/organic hybrid hydrogel system containing titanium dioxide (TiO2)/poly(ethylene glycol) double acrylates (PEGDA) was prepared by in situ photopolymerization on tumor cells for photodynamic therapy (PDT). TiO2 nanorods with diameter of ∼5 nm and length of ∼25 nm in this system presented dual functions, as effective photosensitizers for PDT and initiators for causing the in situ formation of hydrogel, under near-infrared (NIR) irradiation. The hybrid hydrogel retained the TiO2 around tumor cell to form a drug-loaded hydrogel shell. This resulted in a high concentration of singlet oxygen (1O2) under NIR irradiation, which induced apoptosis of tumor cell. Also, the hydrogel could reduce the side effects by preventing TiO2 from migrating to normal tissue. Furthermore, the TiO2 nanorods in this hydrogel shell were photochemically recyclable and could be reused in regular treatment. The outcomes of this study provide a new way to exploit multifunction of inorganic semiconductor nanomaterials for a variety of biomedical applications.
研究领域:
生物医学工程
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纳米医学
·
癌症治疗
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DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Juanjuan Liu,Shihui Zou,Linfang Lu,Hongting Zhao,Liping Xiao,Jie Fan
Pt nanoparticles supported on anatase TiO 2 is an efficient and stable catalyst for room-temperature selective oxidation of benzyl alcohol under base-free aqueous conditions with ambient air as the oxidant. The result shows that the anatase content of support has a big influence on the activity of Pt/TiO 2 . Higher anatase content results in better performance, with optimal activity for Pt/anatase TiO 2 of 76.7 ± 1.5% in conversion and nearly 100% in selectivity to aldehyde within 10 h. Moreover, a quasi-linear relationship between anatase content of the support and the activity of Pt/TiO 2 is observed.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Xinyue Wang,Yingnan Sun,Lu Yang,Qingkun Shang,Dan Wang,Tongtong Guo,Yihang Guo
Photocatalysis is one of the effective strategies to eliminate various organic pollutants in water body. In this paper we have prepared a series of new composite photocatalysts to degrade phenol and norfloxacin under visible light irradiation. They were [Fe II (dpbpy) 2 (H 2 O) 2 ]/TiO 2 , [Fe II (dpbpy)(phen) 2 ]/TiO 2 and [Fe II (dpbpy)(bpy) 2 ]/TiO 2 (dpbpy: 2,2′-bipyridine-4,4′-diphosphoric acid, phen: 1,10-phenanthroline, bpy: 2,2-bipyridyl). The results show that their photocatalytic performance and cyclic stability are much better than that of pure TiO 2 or P25. Phenol can be degraded almost completely and the active groups or substituents of norfloxacin (NOR) can be destroyed also, which greatly reduced the biological toxicity of phenol and norfloxacin in water. The possible mechanisms of improving the photocatalytic activity and stability of TiO 2 by using Fe-complex are proposed based on free radical capture test and density functional theory calculation. It is clearly that the interfacial interaction between Fe-complex and titanium dioxide directly affects the photocatalytic activity and stability of the composite photocatalyst. The conjugated structure of the complexes plays a crucial role.
研究领域:
环境科学
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材料科学
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化学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Junli Wang,Shaopeng Li,Tingting Wang,Fan Guan,Lijun Zhao,Longhua Li,Junhao Zhang,Guanjun Qiao
Semiconductor-sensitized TiO2 thin films with long-term air stability are attractive for optoelectronic devices and applications. Herein, we demonstrate the potential of the TiO2 thin film (∼800 nm in thickness) sensitized with a Sb2Se3 layer (∼350 nm) grown from solution spin coating and processed by annealing recrystallization at 300 °C for high-performance optical detection. The type-II band alignment, p-Sb2Se3/n-TiO2 heterojunction, and narrow band gap of Sb2Se3 (∼1.25 eV) endow the film photodetector with a large photocurrent, high switching stability and on/off ratio (>103), and fast response speeds (<20 ms) under the broadband visible–near-infrared irradiation in a zero-bias self-powered photovoltaic mode. In particular, the photodetector shows notable resistance to oxidation and moisture for long-term operation, which is linked to the modest surface oxidation (Sb–O) of Sb2Se3, as verified by X-ray photoelectron spectroscopy. The first-principles calculations show that a low and medium concentration of oxygen substitution for Se (OSe) and oxygen interstitial (Oi) with negative formation energies can lead to such a moderate surface oxidation but do not generate impurity states or just introduce a shallow-level acceptor state in the electronic structures of Sb2Se3 without degrading its optoelectronic performance. Our theoretical results offer a rational explanation for the air-stable and oxidation/moisture-resistant characteristics in moderately oxidized Sb2Se3 and may shed light on the surface oxidation–property relationship studies of other nonoxide semiconductor-sensitized devices.
研究领域:
材料科学
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光电材料
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半导体物理
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 37
·56379-56392
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IF 5.19
Hu Ximin,Han Wenyuan,Zhang Manqi,Li Degang,Sun Hongqi
Carbon quantum dots (CQDs) can be used to modify TiO 2 to extend the light absorption threshold and enhance its photocatalytic efficiency. In this study, different amounts of CQDs modified TiO 2 (CQDs-x/TiO 2 ) were synthesized by a facile, mild, and environmental friendly hydrothermal method at a low temperature. The physicochemical properties were investigated by a variety of advanced characterization techniques. It was found that the anchoring of CQDs endowed the CQDs-x/TiO 2 with a large specific surface area, which is beneficial to adsorb more organic pollutants and promote the rate of photocatalytic oxidation. The XRD results also showed that the in situ formation of CQDs on the surface of TiO 2 made the crystallinity of TiO 2 tend to be complete. Among these photocatalysts, CQDs-20/TiO 2 showed the highest pollutant removal efficiency under visible light irradiations. The classical quenching tests revealed that the O 2 •− , • OH, and hole (h + ) were the oxidizing species. Among them, h + was the primary factor contributing to the degradation. The electrochemical tests showed that the anchoring of CQDs on TiO 2 increased the photocurrent by about four times, as compared with the pure TiO 2 . In particular, the cyclic voltammetry results showed that the photo-generated electrons of CQDs were freer to transfer to TiO 2 under visible light irradiations, promoting the separation of photo-generated electrons and holes. This study explains adequately why the CQDs/TiO 2 system has a good photocatalytic degradation of organic compounds.
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
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yucheng Ou,Gangqiang Zhu,Fei Rao,Jianzhi Gao,Jun Chang,Xiaotao Xie,Weibin Zhang,Yu Huang,Mirabbos Hojamberdiev
Coral-like TiO2−δ microstructures with high surface area were synthesized by a simple hydrothermal method, followed by thermal treatment in a N2 atmosphere. The introduction of oxygen vacancies (OVs) to TiO2 significantly improved light absorption and inhibited the recombination of photogenerated charge carriers. Then, multiwalled carbon nanotubes (CNTs) and N-doped carbon quantum dots (N-CQDs) were decorated on the surface of coral-like TiO2−δ microstructures. The CNTs could greatly improve the separation and transfer efficiency of photogenerated charge carriers, while the N-CQDs could further extend light absorption to longer wavelengths, including the IR region. According to the results of electron spin resonance (ESR) spectroscopy, the introduction of OVs to TiO2−δ and surface modification with CNTs and N-CQDs promoted the generation of •O2– and •OH active species. The formation of •O2– and •OH active species on the surface of TiO2−δ/CNTs/N-CQDs played an important role in the deep oxidation and selective conversion of NO into nitrate. Density functional theory calculations revealed the adsorption and reaction sites for H2O and O2 separately in space over the surface of TiO2−δ/CNTs/N-CQDs. Namely, the reaction sites of H2O and O2 are on the surface of TiO2−δ and CNTs, respectively. The electron transfer from TiO2−δ to CNTs was further verified through the differential charge density. This study demonstrates a straightforward approach for designing full-spectrum-responsive photocatalysts with high efficiency, stability, and selectivity for NO removal.
研究领域:
材料科学
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环境科学
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光催化
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DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·
IF 2.4
Chen Zhuo,Yu Binqi,Yao Tingfeng,Du Weitong,Ma Jianchao
The wettability and reaction behavior of mold flux with different basicity on TiN and TiO 2 substrates were investigated at up to 1400 °C by the sessile drop method, which can provide a theoretical basis for optimizing the composition of the mold flux for high Ti-bearing steel. As the basicity increased, the mold flux exhibited better wettability and a stronger interfacial reaction with TiN. Thus, it was easier to absorb the TiN inclusion in the order of CaO–SiO 2 -based flux (CS) > CaO–SiO 2 –Al 2 O 3 -based flux (CSA) > CaO–Al 2 O 3 -based flux (CA). Scanning electron microscopy coupled with energy-dispersive spectroscopy showed that the interfacial reaction was also related to basicity. There was a visible and regular interfacial reaction layer between TiN and CS and the CSA flux, which was produced by the redox reaction between the SiO 2 in the slag and the TiN substrate, whereas there was no interfacial reaction layer between TiN and the CA flux. As the basicity decreased, the mold flux exhibited better wettability and a stronger interfacial reaction with TiO 2 ; thus, it was easier to absorb the TiO 2 inclusion in the order of CA > CSA > CS. There was also a visible and regular interfacial reaction layer between TiN and the three fluxes, which was produced by the dissolution of TiO 2 and then reacted with CaO to generate CaTiO 3 .
研究领域:
冶金学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Fanyu Meng,Lina Guo,Haocheng Zou,Boming Zhu,Fayang Zhou,Yiqing Zeng,Jiayou Han,Jun Yang,Shule Zhang,Qin Zhong
To achieve high NO oxidation efficiency, excessive O 3 must be used, which would lead to the high cost and escape of ozone. Herein, we adopted low cost and environmental-friendly TiO 2 as the catalyst of low concentration O 3 and H 2 O 2 system for high-efficiency NO x oxidation. The Ti sites on TiO 2 were the deprotonation sites of H 2 O 2 and H 2 O into Ti-OOH and Ti-OH species, respectively. We found that the surface of rutile phase TiO 2 had a low concentration Ti-OOH component but a large amount of Ti-OH after contacting with H 2 O 2 solution, thus lots of ·OH and a few O 2 − radicals formed with introducing O 3 molecules. H 2 O 2 solution induced the formation of a large amount of Ti-OOH and Ti-OH species on the anatase phase TiO 2 surface, thus lots of O 2 − generated in the O 3 /H 2 O 2 system. O 2 − and O H radicals could efficiently oxidize NO, in which O 2 − radicals could oxidize NO to NO 3 − in one step with high selectively. Therefore, anatase TiO 2 had better performance in NO x oxidation than rutile phase TiO 2 . The effect of temperature and SO 2 concentration on NO oxidation was also investigated, the results showed that TiO 2 -A/O 3 /H 2 O 2 system promoted NO oxidation at a low temperature and a low concentration of SO 2 .
研究领域:
环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 23
·8671
·
IF 3.748
Yuan Li,Xirong Lin,Zhanpeng Li,Jinyun Liu
A composite composing of TiO2nanoparticles load on biomass rice husk (RH) is developed by directly growing TiO2nanoparticles on RH. The in-situ growth of the nanocrystals on RH is achieved by a low-cost and one-step homogeneous precipitation. Rapid hydrolysis proceeds at 90 °C by using ammonium fluotitanate and urea to facilitate the selective growth of TiO2. The method provides an easy access to the TiO2-RH composite with a strong interaction between TiO2nanoparticles and the underlying RH. The structure and composition of TiO2-RH are characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and UV-vis absorption spectroscopy. TiO2nanoparticles-RH exhibits a good photocatalytic degradation of methyl orange. The results show that 92% of methyl orange (20 mg L−1) can be degraded within three hours in visible light. The catalytic activity of the composite is not reduced after 6 cycles, and it still reaches 81% after 6 cycles. The enhanced performance is ascribed to the suitable particle size the good dispersibility. It is expected that the high photocatalytical performance and the cost-effective composite presented here will inspire the development of other high-performance photocatalysts.Keywords:TiO2;rice husk;photodegradation;methyl orange;ecological restoration
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2025
·Vol. 54
·期 8
·3467-3477
·
IF 3.3
Wenhui Hu,Zhongxin Song,Lingna Sun,Lei Zhang,Qianling Zhang,Xiangzhong Ren,Yongliang Li
Efficient separation of photogenerated charge carriers is essential for maximizing the photocatalytic efficiency of semiconductor materials in oxygen evolution reactions (OER). This study presents a novel trimetallic photocatalyst, MIL-100(Fe)/TiO2/CoOx, synthesized through a facile microwave-assisted hydrothermal method followed by atomic layer deposition (ALD). The porous MIL-100(Fe) serves as a support for the sequential deposition of TiO2 and CoOx layers via ALD, which enhances electron–hole pair separation and minimizes their recombination. Characterization using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) confirms the uniform deposition of TiO2 and CoOx layers on the MIL-100(Fe) surface. The optimized photocatalyst, processed with 20 deposition cycles of Co, exhibits exceptional photocatalytic OER performance, with an oxygen evolution rate of 558.3 μmol g−1 h−1. This enhancement in activity is attributed to the synergistic interaction between the spatially separated TiO2 and CoOx cocatalysts, which facilitates efficient charge transfer and increases the number of active sites. These findings highlight the potential of ALD-fabricated heterostructures in the development of advanced photocatalysts for sustainable energy production.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Zhiqiang Liu,Jiang Wu,Jianmin Wang,Run Wang,Guolong Liu,Yongfeng Qi,Weixin Xu,Guangqian Luo,Minghou Xu
The morphology of the catalyst is one of the important factors affecting the photocatalytic activity. In this work, fluoride-mediated TiO 2 with different morphologies was successfully prepared based on Ostwald ripening. In particular, the morphology and structure of the TiO 2 sample can be adjusted according to different ionic environments. Combining experiments and characterization, the regulation mechanism of different fluorides on the morphology and structure of TiO 2 was proposed, and the transport behavior of photogenerated carriers was evaluated. The results show that the morphology and structure have a greater impact on the photocatalytic activity of TiO 2 . The hollow structure can promote the separation and transfer of carrier and enhance the light collection ability. The surface fluoride as an electron trap can reduce the carrier recombination rate, which is beneficial to the photocatalytic activity of the as-prepared sample. The hollow structure sample shows a good photocatalytic efficiency in the photocatalytic removal of Hg 0 in the gas phase, reaching about twice the commercial P25. Finally, the photocatalytic mechanism of the catalyst and the electron-hole migration path are proposed. This research provides new ideas for the design of hollow TiO 2 microspheres, which can be widely used in the field of catalysis.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yunxia Bai,Mei Li,Xuemei Liu,Jinyu Han,Xinli Zhu,Qingfeng Ge,Hua Wang
Photocatalytic CO2 reduction is a promising route to simultaneously address two critical issues related to the energy and environment. Herein, a direct Z-scheme photocatalytic system, Ti3+ defective TiO2/CdS nanoflowers, was fabricated to enhance the production of C1–C3 products from CO2 reduction. First, nanoflower-like TiO2 (NF-TiO2) is prepared using a TiB2 precursor to build in Ti3+ defects. Then, the NF-TiO2/CdS heterojunctions are constructed via the sulfurization of TiO2/Cd-MOF. Importantly, the optimal heterojunction photocatalyst NF-TiO2/CdS0.6 exhibits a highly promoted CO2 reduction activity not only for CO and CH4 but also for C2–C3 hydrocarbons. The cumulative yields of CO and CH4 are 1007.0 μmol/g and 83.5 μmol/g (2.5 h), respectively, and a yield of 55.3 μmol/g (2.5 h) of C2–C3 hydrocarbons is obtained. This enhanced yield of C1–C3 products is attributed to the synergistic effects of abundant Ti3+ defects that increase adsorption and activation of CO2, the large surface area that provides sufficient active sites, and a direct Z-scheme heterojunction with a good intimate contact interface that effectively separates charge carriers and accumulates electrons with strong reducibility. Moreover, the photoluminescence analysis of hydroxyl radicals was conducted to provide evidence for the direct Z-scheme mechanism. This work provides a facile method for the construction of a TiO2-based direct Z-scheme photocatalytic system for improving photocatalytic performance toward CO2 reduction.
研究领域:
材料科学
·
环境科学
·
能源科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）