CHEMISTRY OF MATERIALS
·
2012
·
IF 7.286
Wei Sun,Shuxue Zhou,Bo You,Limin Wu
This paper presents the first successful fabrication of hierarchically ordered porous (HOP) TiO2. Poly(styrene-co-acrylic acid) colloidal spheres and triblock copolymer P123 were used as macro- and mesoporous structure-directing agents, and titanium chloride and titanium tetraisopropoxide were used as sources of titania. When the mixture of polymer spheres, P123, and titania precursors were cast on substrates, and conducted for complete solvent evaporation, followed by thermal treatment, large-scale HOP TiO2 can be directly fabricated. The in situ chelate effect between the titania precursors and the poly(styrene-co-acrylic acid) plays a key role in the fabrication of HOP TiO2. The as-obtained HOP TiO2 exhibits 50% and 70% greater the highest photocurrent under UV and visible lights, respectively, and far higher photoelectrocatalytic property than commercial TiO2 (P-25).
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Yuxuan Li,Weixin Li,Lei Zhao,Jing Ge,Xuan He,Wei Fang,Hui Chen
TiO 2 photoanode as the light harvest skeleton and electron transport material plays a critical role in the photovoltaic performance of the quantum dots sensitized solar cells (QDSSCs). In this paper, a bilayer-structured film with micro-flower TiO 2 as an overlayer and hierarchical porous TiO 2 as an underlayer is fabricated. The hierarchical porous TiO 2 film is synthesized by the virtue of foam and the TiO 2 micro-flower is introduced by spin-coating method. This TiO 2 micro-flower supplies more adsorption sites for CdSe quantum dots, thus leading to the enhanced light harvesting efficiency. The staggered structure between the anatase nanoparticle and the rutile micro-flower will facilitate the separation of electron-hole pairs and promote the injection process of electron. Consequently, the photovoltaic performance of QDSSCs based on the TiO 2 micro-flower modified photoanode is about 43% higher than that of the bare porous TiO 2 photoanode.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMPHYSCHEM
·
2015
·Vol. 16
·期 13
·2826-2835
·
IF 3.419
Shiwei Zhou,Yingying Wang,Ming Zhao,Li-Ping Jiang,Jun-Jie Zhu
Graphical Joining the dots: A core–shell–shell CdSeTe@CdS@ZnS quantum-dot-sensitized macroporous TiO 2 plate is built as a photoelectrochemical signal output system, and the film is modified further with biotin–DEVD–peptide, which can be cleaved specifically by caspase-3 and streptavidin-labeled alkaline phosphatase (SA-ALP), to assemble a multisignal-amplified photoelectrochemical platform. A macroporous TiO 2 film (M-TiO 2 ), which was prepared by burning off the polystyrene microsphere (PS) template from a PS/TiO 2 composite film, can provide a large active surface, improve electron-transport performance, and increase the photocurrent. Furthermore, core–shell–shell CdSeTe@CdS@ZnS quantum dots (QDs) were introduced to sensitize the M-TiO 2 film, which can efficiently broaden the absorption spectra range, separate and transfer charge carriers, reduce recombination loss, and improve photovoltaic response, with a sensitization shell of CdS and a passivation shell of ZnS. A multisignal-amplified photoelectrochemical platform was fabricated by further modifying this film with a combination of biotin–DEVD–peptide (Biotin–Gly–Asp–Gly–Asp–Glu–Val–Asp–Gly–Cys) (which is specifically cleaved by caspase-3) and streptavidin-labeled alkaline phosphatase (SA-ALP). Under the enzymatic catalysis of ALP with the substrate 2-phospho- L -ascorbic acid trisodium salt (AAP), ascorbic acid (AA) was generated as a better electron donor, leading to increased photocurrent output. The activity of caspase-3, which depends on the amount of residual peptide on the electrode, was inversely proportional to the amount of AA. By monitoring the variation of photocurrent caused by AA, caspase-3 activity and the therapeutic effect of nilotinib (a special medicine of chronic myeloid leukemia, CML) were indirectly detected and evaluated. The photoelectrochemical platform can be used as a potential evaluation system for monitoring caspase-3 activity and drug effects.
研究领域:
生物医学工程
·
光电化学
✓ 已验证
DOI
PubMed
高影响因子
Acta Biomaterialia
·
2014
·
IF 5.684
Tianyi Wang,Haitao Jiang,Long Wan,Qinfu Zhao,Tongying Jiang,Bing Wang,Siling Wang
Novel multifunctional porous titanium dioxide (TiO 2 ) nanoparticles modified with polyethylenimine (PEI) were developed to explore the feasibility of exploiting the photocatalytic property of titanium dioxide to achieve ultraviolet (UV) light triggered drug release. Additionally, in order to further realize targeting delivery, folic acid , which chemically conjugated to the surface of the functionalized multifunctional porous TiO 2 nanoparticles through amide linkage with free amine groups of PEI, was used as a cancer-targeting agent to effectively promote cancer-cell-specific uptake through receptor-mediated endocytosis . And a typical poorly water-soluble anti-cancer drug, paclitaxel, was encapsulated in multifunctional porous TiO 2 nanoparticles. The PEI on the surface of multifunctional porous TiO 2 nanoparticles could effectively block the channel to prevent premature drug release, thus providing enough circulation time to target cancer cells. Following UV light radiation, PEI molecules on the surface were cut off by the free radicals (OH and O 2 −) that TiO 2 produced, and then the drug loaded in the carrier was released rapidly into the cytoplasm. Importantly, the amount of drug released from multifunctional porous TiO 2 nanoparticles can be regulated by the UV-light radiation time to further control the anti-cancer effect. This multifunctional porous TiO 2 nanoparticle exhibits a combination of stimuli-triggered drug release and cancer cell targeting. The authors believe that the present study will provide important information for the use of porous TiO 2 nanomaterials in light-controlled drug release and targeted therapy.
研究领域:
纳米医学
·
生物材料
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Healthcare Materials
·
2019
·Vol. 8
·期 9
·1801254
·
IF 6.27
Yue He,Jingyuan Wan,Yang Yang,Pei Yuan,Cheng Yang,Zhigang Wang,Liangke Zhang
TiO 2 nanoparticles have emerged as satisfactory sonosensitizers in sonodynamic therapy over the years, but shortcomings such as poor drug loading capability and inadequate techniques to construct suitable TiO 2 nanoparticles, limit their broader applications. Hence, in this paper, versatile nanocomposites that combine mesoporous TiO 2 nanoparticles (mTiO 2 s) with the promising photothermal material, polypyrrole (PPY) to exert synergistic therapeutic effects on tumors are fabricated. The PPY-coated mesoporous TiO 2 nanocomposites (mTiO 2 @PPYs) act as drug delivery vehicles and ultrasonically activated sonosensitizers as well as photothermal agents. Besides, mTiO 2 @PPY may have potential as an ultrasound/photoacoustic (US/PA) imaging contrast agent. The mTiO 2 @PPY shows a favorable drug loading and good photothermal conversion ability. Moreover, intracellular reactive oxygen species generation is verified. The in vitro cell experiments on HepG2 and 4T1 cells demonstrate that honokiol (HNK)-loaded mTiO 2 @PPY has satisfactory cytotoxicity under laser and US irradiation, and the results are further validated by animal experiments. The ability of mTiO 2 @PPY as a contrast agent for US and PA imaging is investigated both in vitro and in vivo. The results indicate that mTiO 2 @PPY-HNK has multitherapeutic effects and bimodal imaging property, which shows great prospect as a novel nanosystem in antitumor applications.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2018
·
IF 2.891
Xing Du,Weixin Li,Lei Zhao,Xuan He,Hui Chen,Wei Fang
A facile in-situ modification of photoanode is proposed to construct a unique hierarchical TiO 2 /ZnO structure with the aim at suppressing charge recombination rate and enhancing light harvest efficiency. Foam is not only employed as the soft template to fabricate hierarchical porous TiO 2 films but also as the carrier to realize in-situ growth of one dimensional ZnO nanowires among the TiO 2 nanoparticles. The results revealed that the hierarchical porous TiO 2 nanoparticles could provide both large surface areas and suitable porosity for the loading of quantum dots. In the meantime, ZnO nanowire can act as scattering centers for light absorption and offer direct pathways for electron transportation, thus decreasing the undesired charge recombination process. Consequently, the novel ZnO nanowires in-situ modified hierarchical porous TiO 2 photoanode are used as photoanode material to boost the performances of CdSe sensitized solar cells by virtue of controlling the moderate growth of ZnO nanowires. As a result, a power conversion efficiency of 3.07% is obtained based on this modified photoanode, which manifests 39.5% improvement compared to that of the cells based on bare TiO 2 hierarchical porous films (2.20%) due to the improved interconnections between TiO 2 nanoparticles and FTO substrate caused by ZnO nanowires.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xinna Gao,Xueyan Wang,Zheng Yang,Yuhua Shen,Anjian Xie
A novel multi-functional yolk-shell SiO 2 @TiO 2 /CDs(y-STCs) nanocomposite with interesting structure of SiO 2 cores, porous TiO 2 shell, and cavities was synthesized by using a simple method. The experimental results indicate that the yolk-shell structure and modification of carbon dots (CDs) play important roles in the enhancement of SERS signals and photocatalytic performance. The y-STCs nanocomposite used as the SERS substrate showed excellent efficiency and reproducibility for the detection of rhodamine 6G (R6G). The detection limit of R6G was shown to be as low as 6 × 10 −8 M. Furthermore, the fabricated y-STCs nanocomposite utilized as the photocatalytst for the degradation of dinitraphenols (DNP) can greatly shorten reaction time to 120 min compared with previous studies, and the DNP degradation rate could reach 96% under simulated sunlight irradiation. The y-STCs nanospheres also possessed excellent cycle stability for the photocatalytic degradation of DNP. Thus, the bi-functional y-STCs nanocomposite may have potential applications in the detection and photocatalytic degradation of organic pollutants.
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
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jimin Du,Mengke Yang,Fangfang Zhang,Xuechun Cheng,Haoran Wu,Huichuang Qin,Qingsong Jian,Xialing Lin,Kaidi Li,Dae Joon Kang
Photoelectrochemical (PEC) water splitting using high-performance catalysts shows considerable promise in generating environment-friendly hydrogen energy. Its practical applications, however, suffer from several shortcomings, such as low photocurrent density, large onset-voltage value, and poor durability. In this study, CuS and CdS quantum-dot-cosensitized porous TiO 2 -based PEC catalysts (CuS-CT) have been successfully synthesized via in situ sulfuration of CuO and CdO coexisting inside a porous TiO 2 monolith by a hydrothermal method . Compared to porous TiO 2 , CuS-sensitized porous TiO 2 (CuS-TiO 2 ), and CdS-sensitized porous TiO 2 (CdS-TiO 2 ) in terms of PEC performance, the CuS-CT photoanode exhibited a significantly high anodic photocurrent for water splitting under simulated sunlight radiation. The photocurrent produced by the optimized sample of 7% CuS-5% CdS-TiO 2 (7% CuS-CT) was nearly 2.7 times higher than that of pure porous TiO 2 at 1.0 V versus a reversible hydrogen electrode (RHE). Porous TiO 2 possesses large surface areas that can drive fast electrolyte transport and afford more surface reaction active sites. On the other hand, CuS and CdS quantum dots not only broaden the visible light absorption range, but also improve photoinduced electron-hole separation efficiency. The co-sensitized multi-nanostructures photoanodes lead to a remarkable and promising application in PEC water splitting reactions.
研究领域:
材料科学
·
光化学
·
能源材料
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2017
·
IF 3.181
Xiaoting Zhang,Shuangshuang Jing,Zehong Chen,Linxin Zhong,Qingzhong Liu,Xinwen Peng,Runcang Sun
3D porous inorganic materials play a vital role in various applications, such as adsorption, catalysis, and electrochemistry, and are an ongoing interest in the synthesis of advanced porous materials. Herein, we aimed to fabricate 3D free-standing hierarchical porous TiO 2 and SiO 2 with tunable porous structure and high specific surface area by using cellulose aerogel as a new biotemplate. The results revealed that the hierarchical porous structure of 3D porous TiO 2 and SiO 2 could be easily tailored by controlling annealing process. The physicochemical structure of the resultant porous materials, such as morphology, specific surface area and phase structure, strongly depended on the thermal stability of the biotemplate. 3D porous TiO 2 and SiO 2 with specific surface areas of high up to 221.1 m 2 /g and 451.3 m 2 /g could be obtained, respectively. In addition, the as-prepared TiO 2 exhibited a high photocatalytic activity, demonstrating their potential application in advanced photocatalysis.
研究领域:
材料科学
·
纳米技术
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2025
·
IF 1.7
Zhang Zhichao,Zhang Jianbo,Li Kangzheng,Tang Binglin,Wang Xiaohui,Tan Ling,Hu Yijie,Luo Qingcheng,Yin Zhe,Yu Guoping,Lv Bo
Natural mineral composite catalysts have attracted much attention due to their great potential in the fields of water treatment, air purification and energy conversion. In this study, porous TiO 2 materials were synthesized from ilmenite by a two-stage calcination and acid leaching process, and porous TiO 2 /CdS composites were prepared by a hydrothermal method. The results of photocatalytic experiments indicate that the porous TiO 2 /CdS composite (PTC-2) with a Ti/Cd molar ratio of 1:1 exhibits the highest photocatalytic activity, with the degradation rate of methylene blue achieving a maximum value of 96.6% at 80 min. Moreover, the composite maintains a degradation efficiency of 88.5% after five cycles. The findings demonstrate that the TiO 2 /CdS heterojunction significantly enhances the photocatalyst's absorption of visible light while facilitating the effective separation and transfer of photogenerated electron–hole (e − /h + ) pairs. The porous architecture of the composite facilitates superior electron transport pathways and effectively mitigates e − /h + recombination. Furthermore, a mechanism for the photocatalytic degradation of organic dyes using porous TiO 2 /CdS composites is proposed, wherein photogenerated superoxide radicals ( · O 2 − ) and hydroxyl radicals ( · OH) serve as the primary reactive species. This study explores the cost-effective synthesis of TiO 2 /CdS heterojunctions and makes a significant contribution to the advancement and utilization of natural minerals for pollution degradation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yiwei Huang,Kunyu Chen,Meina Huang,Renjie Bi,Zhen Li,Yanqiu Zhu,Ming Tang,Zhangfa Tong,Yuanbo Ye,Meiping Zhu
Developing visible-light-responsive TiO 2 -based photocatalysts provides a promising avenue for addressing VOCs pollution. Herein, polydopamine (PDA) template pyrolysis waste was in-situ up-cycled for simultaneous growth of N and C co-doped hollow porous TiO 2 microreactors (H-NT-0.2) in air. The resulting H-NT-0.2 with a highly intact hollow structure, thin spherical shell (∼ 13 nm) and high porosity possesses the highest N and C co-doping ratio and largest oxygen vacancies (OVs) amount, leading to the highest concentration of reactive oxygen species (ROS) among all H-NT- x . A crucial role of OVs in enhancing H 2 O adsorption for the generation of hydroxyl radicals (⋅OH) has been revealed by DFT calculations. As a result, H-NT-0.2 shows the highest photocatalytic oxidation (PCO) efficiency of flowing acetaldehyde gas (90%) under visible light irradiation, which exceeds 3.5 times of commercial TiO 2 (P25)), and outperforms most of the reported photocatalysts. The growth mechanism, as well as the photocatalytic reaction pathways, were analyzed based on TG-MS and in-situ DRIFTS results, respectively. This work provides an economical, green and feasible strategy to develop advanced visible-light-responsive photocatalysts for aldehydes VOCs abatement in practical applications.
研究领域:
环境科学
·
材料科学
·
化学工程
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 8
·082501
·
IF 3.721
Kejia Liu,Yaowu Wang,Yuezhong Di,Jianping Peng,Jing You,Naixiang Feng,Yi Zhang
Diagrams of the equilibrium potential E (relative to the standard chlorine electrode) against the activity of oxide ion ( expressed as its logarithm, pO2−) in systems of Ti-O-Cl-M (M=Li, Na, Mg, Ca, Sr and Ba) were plotted to investigate the electro-deoxidation of porous TiO2 pellets in different chloride molten salts, including LiCl, NaCl, MgCl2, CaCl2, SrCl2 and BaCl2. From the diagrams, the reduction pathways of TiO2 in different molten salts are similar; and the applied potential (vs Cl−/Cl2) on the cathode and O2− ion activity influence greatly on the reduction pathway of TiO2 and the deoxidation limit. To test and verify the results of the thermodynamic analysis, electro-deoxidation experiments in different molten salts were done to determine the actual pathways in the electrochemical reduction of TiO2 and the possible deoxidation limits in the molten salts. The results indicated that the thermodynamic analysis is helpful in predicting and understanding the electrochemical reduction process of titanium oxides though the experimental results differ slightly from the thermodynamic analysis in some systems. Low-oxygen Ti can be obtained only in molten CaCl2.
研究领域:
材料科学
·
电化学
·
冶金学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）