Nanoscale
·
2017
·Vol. 9
·期 46
·18194-18201
·
IF 7.367
Qianyu Wang,Peng Yu,Lu Bai,Ruiying Bao,Ning Wang,Chuanbing Cheng,Zhengying Liu,Mingbo Yang,Wei Yang,Zhanhu Guo
Inspired by the leaf/vein structure of leaves which effectively supports the photosynthesis of green plants, a nano-leaf/vein bionic structure of self-assembled TiO2/MoS2 composites is applied to induce the reversible photochromic reactions of methylene blue (MB) for the first time. This reversible photochromic phenomenon gives a novel performance for the TiO2/MoS2 composites and expands their applications. Similar to the case where the natural vein network in leaves ensures the efficient material transfer and energy exchange for photosynthesis, the bionic internal MoS2 vein network in the composites ensures the efficient separation and directional transfer of photo-generated carriers to restrain the photocatalytic degradation reactions and to enhance the reversible photochromic reactions. Furthermore, the photosensitive applications of the TiO2/MoS2/MB systems with such a self-assembled nano-leaf/vein bionic structure are discussed with two typical photoelectric sensory models for both controllers and detectors.
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Nanomaterials
·
2017
·Vol. 7
·期 10
·338
·
IF 3.553
Xiaobo Pan,Xinyue Liang,Longfang Yao,Xinyi Wang,Yueyue Jing,Jiong Ma,Yiyan Fei,Li Chen,Lan Mi
TiO2nanoparticles modified with phthalocyanines (Pc) have been proven to be a potential photosensitizer in the application of photodynamic therapy (PDT). However, the generation of reactive oxygen species (ROS) by TiO2nanoparticles modified with Pc has not been demonstrated clearly. In this study, nitrogen-doped TiO2conjugated with Pc (N-TiO2-Pc) were studied by means of monitoring the generation of ROS. The absorbance and photokilling effect on HeLa cells upon visible light of different regions were also studied and compared with non-doped TiO2-Pc and Pc. Both N-TiO2-Pc and TiO2-Pc can be activated by visible light and exhibited much higher photokilling effect on HeLa cells than Pc. In addition, nitrogen-doping can greatly enhance the formation of1O2and •O2−, while it suppresses the generation of OH•. This resulted in significant photodynamic activity. Therefore, N-TiO2-Pc can be an excellent candidate for a photosensitizer in PDT with wide-spectrum visible irradiation.Keywords:titanium dioxide;phthalocyanine;reactive oxygen species;photodynamic therapy
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TEXTILE RESEARCH JOURNAL
·
2017
·
IF 1.443
Fengxiang Chen,Huiyu Yang,Ke Li,Xin Liu,Bo Deng,Xinfang Xiao,Xiaojie Yang,Binhai Dong,Shimin Wang,Weilin Xu
Ultraviolet (UV)-protective textiles have attracted significant attention because of their wide applicability. However, the anti-UV coatings of such textiles have an adverse effect on their wearing comfort, and other properties related to luster, softness and handle were also ignored. In this study, TiO2-coated silk fabric with controllable UV-protection properties was successfully fabricated via atomic layer deposition (ALD). The luster, bending properties, crease recovery, mechanical properties, air permeability and anti-UV properties of the TiO2-coated silk fabric were investigated. The results showed that the thickness, whiteness, bendability, tensile strength and anti-UV properties of the silk fabric increased progressively while its air permeability, wet crease recovery angle and dry crease recovery angle decreased with an increase in the thickness of the TiO2 coating. However, the coating did not have a negative effect on the usability of the fabric. Thus, the proposed ALD method is a promising one for modifying the surfaces of elastic textile materials in order to accord them with UV-protection properties.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 22
·期 2
·347-353
·
IF 2.316
Lan Zhang,Chen Xin,Zhang Sheng,Wu Jihuai
Three-dimensional TiO 2 hierarchical nanostructures (3D-TiO 2 -HNs) containing TiO 2 nanotrees and nest-like hollow spheres were synthesized and used as backbones for CdSe
x
S 1− x
quantum dot (QD) loading. These CdSe
x
S 1− x
QD-sensitized 3D-TiO 2 -HNs were then used as photoelectrodes in the preparation of quantum-dot-sensitized solar cells. As revealed by TEM images, the highly porous 3D-TiO 2 -HNs represent an excellent framework on which to deposit a large number of CdSe
x
S 1− x
QDs in order to form homogeneous and compact CdSe
x
S 1− x
-sensitized layers in photoelectrodes using a spin-assisted successive ionic layer adsorption and reaction method (spin-SILAR). Following careful adjustment of the molar ratio of Se 2− to S 2− , the number of spin-SILAR cycles, and the thickness of the CdS passivation layer used, the best-performing QDSC was shown to yield a short-circuit current density of 18.22 mA cm −2 , an open-circuit voltage of 0.520 V, a fill factor of 0.510, and a power conversion efficiency of 4.83%. This high performance is possible because the device is able to absorb a relatively broad range of wavelengths and because charge recombination is suppressed in the device.
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FOOD AND CHEMICAL TOXICOLOGY
·
2024
·
IF 3.9
Canyang Wang,Yanxin Liu,Yayu He,Juan Li,Yi Cao
Oral exposure to nanoparticles (NPs) may affect intestinal microbiota, and this effect may be further changed by co-contaminates. In the present study, we investigated the combined effects of TiO 2 NPs and fipronil (FPN) on microbiota in mouse intestines. Mice were intragastric exposed to 5.74 mg/kg TiO 2 NPs, 2.5 mg/kg FPN, or both of them, once a day, for 30 days. The results showed that individual exposure to TiO 2 NPs or FPN decreased body weight and induced pathological changes in intestines. The exposure was also associated with increased cleaved caspase-3 protein, oxidative stress and decreased tight junction protein expression. Furthermore, the levels of diamine oxidase (DAO), lipopolysaccharide (LPS) and inflammatory cytokines in serum were also elevated, indicating increased intestinal barrier permeability. As expected, both TiO 2 NPs and FPN decreased the diversity and altered the composition of microbiota. However, the observed effects were not further enhanced after the co-exposure to TiO 2 NPs and FPN, except that Romboutsia was only significantly increased after the co-exposure to TiO 2 NPs + FPN. We concluded that oral exposure to TiO 2 NPs and FPN showed minimal synergistic effects on microbiota in mouse intestine.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Mingtao Wang,Shijie Wang,Zhenzi Li,Xuepeng Wang,Liping Guo,Haixia Liu,Lijun Liao,Wei Zhou
Photocatalysis is an alternative for antibiotics removal from wastewater for the sustainable development of human society. However, applying photocatalysts for antibiotics (e.g., tetracycline) degradation under practical conditions is highly restricted by the low reaction efficiency due to the prompt charge recombination. Constructing porous heterojunctions is an efficient way to regulate the electron transfer path and accelerate charge migration efficiency. Herein, TiO 2 /defective UiO-66 porous octahedral S-scheme heterojunctions are successfully fabricated through an in-situ growth strategy. The strong interaction and charge migration behavior between TiO 2 and defective UiO-66 have been studied using X-ray photoelectron spectroscopy and electron paramagnetic resonance measurements. The photocatalytic removal efficiency of tetracycline is notably improved by forming TiO 2 /defective UiO-66 porous heterojunctions. The promoted photocatalytic performance can be ascribed to the strong interaction between TiO 2 and defective UiO-66, and the accelerated charge separation and transfer efficiency due to the formation of S-scheme heterojunctions, thus generating abundant reactive oxygen species, including O 2 − and OH. The optimized 38-TiO 2 /UiO-66-300 can eliminate 97.9 % of tetracycline in 60 min with a reaction constant rate of 0.0425 min −1 , which is approximately 4 and 10 times that of pristine TiO 2 and UiO-66-300, respectively. This work provides an alternate strategy for preparing highly active heterojunction photocatalysts for environmental applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xiaodi Jiang,Yaoning Bai,Xu Wang,Weiyao Wang,Yuxian Duan,Yingnan Liu,Xinru Li,Zichen Wang,Jinming Cai,Xiaoming Cai,Honglin Tan
Bimetallic nanostructures are currently a hot pot material among many hydrogen generation co-catalysts. In this study, CuCo bimetallic nanostructures were formed by introducing Co into Cu as the co-catalyst for TiO 2 . Characterization results from XRD , XPS , and TEM indicated the successful preparation of the high-crystallinity, impurity-free CuCo/TiO 2 photocatalyst , with CuCo bimetallic nanoparticles uniformly dispersed on TiO 2 . After the addition of Co, density functional theory (DFT) calculations showed that the free energy of H adsorption on the Cu site was optimized from 0.27 eV to −0.56 eV, which was beneficial for hydrogen production from TiO 2 . Electrochemical characterization, photoluminescence (PL) spectroscopy, infrared (IR) thermography, and finite difference in time domain (FDTD) results showed that the bimetallic CuCo acted as the co-catalyst, which increased the temperature of the reaction system, facilitated the separation of light-generated electron-hole pairs, and accelerated the charge transfer, thus promoting the photocatalytic hydrogen generation. The findings of the photocatalytic performance demonstrate that the photocatalyst exhibits the H 2 generation rate of 1933.8 μmol/g/h, which is approximately 9 times greater than that of pure TiO 2 (213.4 μmol/g/h), when the bimetallic CuCo is loaded in the molar ratio of 5:5 and at the loading amount of 2 wt%. Additionally, the photocatalyst demonstrated excellent catalytic stability, reaching 87.1% of the initial after 16 h of cycling tests. It is foreseen that further study and optimization of various metal couplings may enable the larger widespread application of bimetals as co-catalysts for hydrogen generation.
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Membranes
·
2024
·Vol. 14
·期 11
·233
·
IF 3.3
Wenjing Zhang,Jiangzhou Luo,Honglei Ling,Lei Huang,Song Xue
In the pursuit of developing advanced nanofiltration membranes with high permeation flux for organic solvents, a TiO 2 nanofilm was synthesized via a vapor–liquid interfacial reaction on a flat-sheet α-Al 2 O 3 ceramic support. This process involves the reaction of glycerol, an organic precursor with a structure featuring 1,2-diol and 1,3-diol groups, with TiCl 4 vapor to form organometallic hybrid films. Subsequent calcination in air at 250 °C transforms these hybrid films into carbon-doped titanium oxide nanofilms. The unique structure of glycerol plays a crucial role in determining the properties of the resulting nanopores, which exhibit high solvent permeance and effective solute rejection. The synthesized carbon-doped TiO 2 nanofiltration membranes demonstrated impressive performance, achieving a pure methanol permeability as high as 90.9 L·m −2 ·h −1 ·bar −1 . Moreover, these membranes exhibited a rejection rate of 93.2% for Congo Red in a methanol solution, underscoring their efficacy in separating solutes from solvents. The rigidity of the nanopores within these nanofilms, when supported on ceramic materials, confers high chemical stability even in the presence of polar solvents. This robustness makes the carbon-doped TiO 2 nanofilms suitable for applications in the purification and recovery of organic solvents.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Mao-Jin Ran,Meng Wang,Zhi-Yi Hu,Yi-Fu Huang,Lin-Dong Wang,Lu Wu,Man-Man Yuan,Jian Zhang,Bei Li,Gustaaf Van Tendeloo,Yu Li,Bao-Lian Su
Constructing heterojunctions have received significant attention in photocatalysis because of their efficient separation of photogenerated carriers and improving light utilization efficiency. Bimetallic sulfides (e.g. NiCo 2 S 4 ) are applied in electrocatalysis and supercapacitors that can be coupled with TiO 2 to form a heterojunction . Owing to the staggered energy band arrangement between TiO 2 and NiCo 2 S 4 , the establishing of a Z-scheme heterojunction between them is expected to enhance the carrier separation efficiency and reduce the sulfide photo-corrosion. However, the application of NiCo 2 S 4 in photocatalysis and studies on the mechanism of the TiO 2 /NiCo 2 S 4 Z-scheme heterojunction have seldom been reported. In this work, we obtained a hollow core-shell TiO 2 /NiCo 2 S 4 Z-scheme photocatalyst through a solvothermal method for photocatalytic hydrogen evolution (PHE). The PHE rate of the optimized TiO 2 /NiCo 2 S 4 -0.3 is 8.55 mmol g − 1 h − 1 , approximately 34 times higher than pure TiO 2 , 94 times higher than pure NiCo 2 S 4 . The remarkable photocatalytic activity can be ascribed to the hollow structure and the in-situ constructed Z-scheme heterojunction. The photogenerated charge transfer mechanism is revealed by hydroxyl radical trapping experiments and electron paramagnetic resonance (EPR) characterization. The in-situ construction of the Z-scheme heterojunction not only enhances the efficiency of separating the photogenerated carriers but also reduces the photo-corrosion of NiCo 2 S 4 . This study proposes an effective strategy for the design of TiO 2 -based Z-scheme heterojunctions and the application of NiCo 2 S 4 in photocatalysis .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
He Ma,Dashuai Li,Yingying Li,Yuanyuan Li,Changhua Wang,Xintong Zhang
While photocatalytic technology has been recognized as an effective means for removing low-concentration NOx in ambient atmosphere, it still faces the challenge of the deep oxidation in high efficiency. In many cases, the release of more toxic NO 2 byproduct appeared to be inevitable during the photocatalytic oxidation of NO. Herein we report that the atomically dispersed MnO x cocatalyst on TiO 2 (B) microspheres could significantly enhance the deep oxidation of NOx under mild photocatalytic conditions (1 mW/cm 2 UV-A light, 1 L/min flow rate). At an initial NO concentration of 0.35 ppm, ca. 67.15% of NO is oxidized on the MT-0.5 sample, which is 2.76 times higher than the pristine TiO 2 (B) sample. More importantly, the release of NO 2 is suppressed by 2.11 times. Comprehensive spectral analyses suggest that atomically dispersed MnO x effectively promotes the charge separation of photogenerated carriers in TiO 2 (B), even better than MnO x nanoparticles-loaded TiO 2 (B). EPR and in-situ FTIR analyses illustrate that atomically dispersed MnO x -loaded TiO 2 (B) sample exhibits excellent low concentration NOx abatement performance, thus providing a rational mechanism for the NO deep oxidation pathway. This study not only provides a unique approach for preparing non-noble metal atomically dispersed co-catalysts, but also affords an effective means for efficient photocatalytic NO degradation.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2015
·
IF 3.512
Jiang Wu,Xian Li,Jianxing Ren,Xuemei Qi,Ping He,Bu Ni,Chong Zhang,Chengzhen Hu,Jun Zhou
TiO 2 hollow sphere was synthesized by hydrothermal method using trifluoroacetic acid (TFA) and Ti(SO 4 ) 2 as raw materials, and it was applied to photocatalytic oxidization of elemental mercury (Hg 0 ) in the simulated flue gas. The prepared samples were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectra (UV-vis DRS) and nitrogen adsorption/desorption. The results showed that only anatase phase TiO 2 hollow sphere was obtained. The average diameter of TiO 2 hollow spheres was about 800 nm and the shell thickness was about 200–400 nm. When M , the molar ratio of TFA to Ti(SO 4 ) 2 , was higher than a certain value, the photocatalytic activity of prepared TiO 2 hollow spheres began to reduce. When M = 2, addition TFA content was the best quantity, which got the best TiO 2 hollow spheres and provided the most appropriate F − decomposed from TFA during the sample preparation, which was helpful to its photocatalytic ability. In the experimental temperature range, the photocatalytic oxidation efficiency decreased with the increasing of reaction temperature, and the intensity of UV irradiation had an important effect on the photocatalytic reaction. When UV irradiation intensity was 303.45 μW cm −2 and reaction temperature was 55 °C, TiO 2 hollow sphere sample prepared at M = 2 had the highest photocatalytic ability and the mercury removal efficiency reached up to 82.75%.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 25
·13390-13401
·
IF 7.443
Enyan Guo,Longwei Yin
We present a novel type of SrTiO3/TiO2 nanosheet heterostructure via a facile hydrothermal process, with a tunable microstructure, phase component and surface area by adjusting the molar ratio of Sr and Ti precursors. The synthesized SrTiO3/TiO2 heterostructure nanostructures can provide a high surface area and porous structure for improving the dye loading capacity and hence the amount of photogenerated charges contributing to the photocurrent. The formation of heterostructures between SrTiO3 and TiO2 with a uniquely matched band gap energy structure can efficiently separate photogenerated charge carriers. Photoluminescence emission and electrochemical impedance spectroscopy (EIS) and incident photon-to-electron conversion efficiency (IPCE) measurements reveal a lower recombination rate of photogenerated electrons and holes, and a longer electron lifetime for DSSCs based on the SrTiO3/TiO2 heterostructures. The photoelectric conversion efficiency and short-circuit current density of DSSCs based on SrTiO3/TiO2 heterostructures are greatly enhanced over those of pure TiO2 nanosheets. DSSCs based on the SrTiO3/TiO2 heterostructures show a highest short-circuit current density of 12.55 mA cm−2 and a maximal photoelectric conversion efficiency of 7.42% under one sun illumination.
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