JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tianwei Zhao,Gang Cheng,Wuxia Zhang,Jinyan Xiong
Hollow-structured TiO 2 is promising for photocatalytic CO 2 reduction due to its high surface area and light absorption. This study aims to enhance its photocatalytic activity through the engineering of Cu and CuAg alloy cocatalysts. Hollow TiO 2 was synthesized by a hard template method, followed by Cu loading and CuAg alloy formation via a chemical replacement reaction. The optimal 7 % Cu loading achieved the highest CH 4 yield of 2.47 μmol g −1 h −1 among the TiO 2 -Cu composites. Introducing Ag further enhanced the performance, with the Cu:Ag = 9:1 alloy boosting the CH 4 yield to 6.72 μmol g −1 h −1 , approximately 14 times that of pure TiO 2 . Characterization techniques such as XRD, SEM, and XPS were also employed to analyze the phase composition, microstructure, and photoelectrochemical properties of the synthesized materials. The experimental findings indicate that the introduction of the CuAg alloy significantly promotes charge separation and transfer efficiency, and increases the effective active sites on the TiO 2 surface, thereby greatly enhancing the efficiency of the photocatalytic reaction. These findings offer insights into the design of efficient photocatalytic materials for sustainable energy applications.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Junlei Wang,Xueqin Wang,Qihui Chen,Helong Xu,Man Dai,Mei Zhang,Wenyi Wang,Hua Song
The microstructure of photocatalysts plays a key role in enhancing their photocatalytic performance. Herein, resorcinol/formaldehyde (RF) polymer resin was prepared using the extended Stöber process and used for hard templates. Hollow TiO 2 spheres (HTS) were synthesized via hydrolysis of a versatile kinetics-controlled coating and carbonization method. The physicochemical properties of as-prepared catalysts were characterized. The pure RF template had a uniform diameter of ~450 nm. By adjusting the ammonia dosage from 0.1 to 0.35 mL, monodisperse RF@TiO 2 spheres were obtained with a porous TiO 2 shell of ~25–160 nm in thickness. The concentration of ammonia had a significant effect on the micromorphology, and hence, the photocatalytic properties of the HTS. The Brunauer-Emmett-Teller surface area and pore volume were ~30 m 2 /g and 0.082 cm 3 /g, respectively. The intrinsically high conductivity of the HTS microspheres and their high surface area resulting from this robust hollow structure was beneficial for photocatalytic performance toward phenol decomposition.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yeming Mei,Hongli Liu,Xianggao Li,Shirong Wang
Hollow TiO 2 spheres were synthesized by template method, with the diameters was 200 nm and the thickness of shell about 30 nm. The high-quality perovskite films fabricated on the hollow TiO 2 mesoporous layer demonstrate smooth surface and large grain size, resulting in the better scattering light ability and fewer defects. The efficiency of the perovskite solar cells prepared on hollow mesoporous layer can reach 17.60%, which is an approximately 14% higher than the PCE of conventional mesoporous layer devices under the same condition. Importantly, the solar cells with hollow TiO 2 can exhibit better stability than the cells with mesoporous TiO 2 after aging 30 days in 65% relative humidity under dark conditions. The results indicate that the hollow TiO 2 mesoporous layer will be a candidate for better efficient and stable CH 3 NH 3 PbI 3 perovskite solar cells, and this structure provides a direction for the design of novel mesoporous layers for perovskite solar cells in future.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Jun Jiang,Zhidong Chen,Peng Wang,Pei-Yang Gu,Jiadi Liu,Zhuzhu Zhang,Qingfeng Xu
At present, hexavalent chromium (Cr(VI)) has a serious impact on the water environment and human beings since it can be easily absorbed by the human body, lethal to aquatic organisms and carcinogenic to humans. Based on this, a black hollow TiO 2 nanotube supported polydopamine (PDA)@Ag 2 S composite photocatalytic material was prepared, which can be used for the efficient photocatalytic reduction of Cr(VI) in wastewater. Both black hollow TiO 2 and Ag 2 S have the shortcoming of undergoing ready recombination of photogenerated carriers. The introduction of PDA can not only improve the photogeneration of composite photocatalytic materials, but also broaden the absorption range in the visible-light region. A detailed mechanism for the TiO 2-x @PDA@Ag 2 S photocatalytic system has been proposed at the same time. This work provides a new methodology for the design and synthesis of sandwich organic-inorganic hybrid photocatalytic materials.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4676-4681
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IF 1.556
Sun Na,Zhao Xiang,Xiao Zhenggang
In order to improve the compatibility between nanoparticles and polymer matrix, a feasible processing way for grafting polyimides (PI) on the surface of hollow TiO2 particles was developed. Hollow TiO2 spheres were prepared by using polystyrene-methyl acrylic acid
latex as a template starting from tetrabutyl titanate. Surface graft of azide-decorated hollow TiO2 spheres with welldefined alkyne-terminated PI were achieved by “click” chemistry in three steps: (1) choloromethylation and azidization of hollow TiO2, (2)
preparation of alkyne-terminated PI by polycondensation, (3) click coupling between the azidized hollow TiO2 and the alkyne-terminated PI under the catalysis of CuSO4/sodium ascorbate. Fourier transform infrared (FTIR) and Nuclear Magnetic Resonance (1HNMR) spectra were
used to illustrate quantitative transformation of the PI brushes on hollow TiO2 particles into the desired functional group. The morphology of hollow TiO2-PI composite particles was characterized by transmission electron microscopy (TEM) which showed the irregular hollow
structure. The results indicate that the grafting of polymer chains with thermostability and flame retardance on the surface of hollow TiO2 sphere is successful.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 101
·99072-99080
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IF 3.289
Xiaosong Guo,Xiaoguang Yu,Yulu Chen,Zijia Feng,Qinglin Li,Zhenheng Sun,Guicun Li,Chuncheng Hao,Qingquan Lei
Hollow TiO2 nanospheres were fabricated and adopted as dispersing materials in ER fluids with different viscosities in order to investigate variation of polarized particles before and after the formation of chainlike structure in electrorheological (ER) fluids. Results showed that the ER fluid with low viscosity had better ER efficiency than that with high viscosity, which was ascribed to the better ability of low viscosity ER fluid in maintaining chainlike structures. From an analysis of dielectric properties, it was found that increase of permittivity of ER fluids at low frequency should result from the distribution change of polarized particles in ER fluids. Distribution variation of polarized particles would induce the increase of electric field strength in the region of chainlike structure, which was called “secondary polarization”. This secondary polarization led to an increase of the number of charges on the surface of polarized particles, causing further enhancement of electrostatic interactions between polarized particles. Moreover, the magnitude of polarized charge caused by secondary polarization was much larger than that caused by interface polarization, which suggested that the secondary polarization played an important role in the ER phenomenon. A novel model with detailed explanation about the ER effect is proposed. Furthermore, relationships among the polarizability of dispersed particles, characteristic of dielectric spectrum at low frequency, and ER properties are discussed in detail.
研究领域:
材料科学
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物理学
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hongying Cheng,Song Liu,Cuiying Hu,Hongxia Wang
A novel flower-like film composed of uniform hollow TiO 2 -NH 2 nano-shell (HTNs), luminol and aniline was synthesized by electro-copolymerization method in acidic ionic liquid EmimCl (IL, 1-ethyl-3-methylimidazolium chloride). The surficial morphology of the film was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), selected-area electron diffraction (SAED) and atomic force microscope (AFM), which showed the polycrystalline property. Its copolymerization mechanism was discussed in detail, which presented symmetric arrangement. The most obvious multiple increase of peak current in CV indicated the conjugate of HTNs in luminol structure and in aromatic ring skeleton. This film with excellent electrocatalysis performance used for nonelectroactive acetochlor (ACT) detection showed the lowest catalytic potential. Some important parameters were optimized for a homogeneous film and for a sensitive detection. On the optimum film, the electrocatalysis sensor exhibited a linear response within the concentration range of ACT from 2.0×10 −7 M to 1.5×10 −5 M, and an absolute detection limit of 0.15×10 -9 M at a signal-to-noise ratio of 3. Then the proposed method was used for the detection of ACT residue in the real strawberry sample with good results. The promising sensor presents good reproducibility and stability, providing a new fast and sensitive method for the analysis of real samples in environment.
研究领域:
材料科学
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环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2015
·
IF 6.409
Zhihong Zhang,Shuai Zhang,Linghao He,Donglai Peng,Fufeng Yan,Minghua Wang,Jihong Zhao,Hongzhong Zhang,Shaoming Fang
A composite made of polyacrylic acid and hollow TiO 2 spheres (TiO 2 @PPAA) was prepared by the plasma polymerization method and subsequently used as an electrode material for detecting lysozyme . The chemical structure, surface morphology , and electrochemical performance of the TiO 2 @PPAA composite were mainly affected by the plasma input power used during plasma polymerization. After optimizing plasma conditions, aptamer strands exhibited high adsorption affinity toward the surface of TiO 2 @PPAA composite via synergistic effects between TiO 2 and PPAA. Electrochemical impedance spectroscopy results showed that the developed TiO 2 @PPAA aptasensor presents highly sensitive detection ability toward lysozyme; the limit of detection of the proposed aptasensor is 0.015 ng mL −1 (1.04 pM) within the range of 0.05–100 ng mL −1 in terms of 3 σ value. The film further showed excellent selectivity toward lysozyme in the presence of interfering proteins, such as thrombin, bovine serum albumin , and immunoglobulin E. Thus, this aptasensing strategy might broaden the applications of plasma polymerized nanomaterials in the field of biomedical research and early clinical diagnosis.
研究领域:
生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 23
·3766-3773
·
IF 2.7
Xin He,Caiyun Jiang,Jie Yang,Shuangchao Sheng,Yuping Wang
5-Hydroxymethylfurfural (5-HMF) is a heterocyclic compound with six carbons commonly found in heat-treated carbohydrate-rich foods. 5-HMF exceeding the specified limit is cytotoxic to the human body, and will be converted into carcinogenic substances (5-sulfoxide methyl furfural) after long-term accumulation in the body. Therefore, it is highly necessary to develop a sensitive and accurate detection method for 5-HMF in the field of food safety. In this study, a photoelectric sensing method was developed for the highly sensitive detection of 5-HMF using hollow TiO2 nanospheres successfully synthesized by template, sol–gel and lye etching methods. The structure and composition of the materials were studied by XRD, XPS, SEM and TEM. The electrochemical and photoelectrochemical properties of an h-TiO2 electrode probe based on indium tin oxide (ITO) slides were investigated. The results indicated that the linear relationship of 5-HMF is good in the concentration range of 10−11–10−7 M, and the detection limit of 5-HMF is 0.001 nM. Moreover, the PEC sensor shows high accuracy in the detection of actual samples.
研究领域:
食品安全
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shan Tang,Qun Zhao,Yifeng Tu
This paper describes a novel approach to promote the analytical performance of electrochemiluminescent (ECL) biosensor of cholesterol by a nanocomposite (Au nanoparticles/ion liquid/hollowed TiO 2 nano-shell) pre-functionalized indium tin oxide glass to load the cholesterol oxidase. Here the enzymatically produced hydrogen peroxide greatly intensified the ECL of luminol under the catalysis of the nanocomposite. The quantification of cholesterol was directly accomplished by calibrating the ECL sensing output. The formation and properties of the nanocomposite and the functionalized electrode have been confirmed by electrochemistry , spectroscopy and electron-microscopy. The prepared biosensor exhibits a linear regression ranged from 8.33 × 10 −9 M to 4.17 × 10 −7 M with an ultralow detection limit (LOD) of 6.30 × 10 −9 M. It also possesses the excellent specificity for cholesterol from potential interferents , the favorable repeatability/stability for use or storage, the good reproducibility and adequate recovery for real sample test. In addition, for the detection of clinical serum sample, it is well consistent with the datum from medical cholesterol kit, indicating its reliability. It is in promising of the application for the cholesterol detection in those clinical specimens of teeny amount of sample and limited concentration.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiaozhen Zhang,Han Yu,Yanhua Song,Jingyao Li,Fangke Wang,Ruyan Xie,Shuzhe Zhang,Haifeng Zou
Organic contaminants in the water environment and liquid foods have posed a great threat to the environment as well as human well-being, and the low catalytic activity of traditional TiO 2 photocatalysts limits its further application. Here, inspired by nature, a novel hydrogenated rambutan-like hollow TiO 2 (denoted as HRT) was synthesized by facile hydrothermal treatment and in-situ hydrogenation reduction steps. The protruding spikes on the surface of the 3D rambutan-like hollow structure build a fast channel for charge transfer, the suitable cavity enhances light scattering and collection. The available inner/outer surface can bind contaminants more rapidly which facilitates transportation of photo-generated electrons. Relying on its special structure and abundant surface defects, HRT exhibits excellent photocatalytic degradation property. Under visible light irradiation, the photodegradation rate of rhodamine B (RhB) by HRT nearly reached 100.0%, and 80.0% for tetracycline (TC) within only 10 min, whose photocatalytic activity was 6.45 and 2.08 times higher than that of RT, respectively. Moreover, the innovative and practical application of HRT to the degradation of TC in milk revealed favorable degradation efficiency (71.0%) and salient catalytic reusability after five cycles. This work provides a new perspective on the purification of multiple organic contaminants in aqueous systems, points the way to the intractable problem of removing antibiotics from liquid foods and expands the application fields of semiconductor photocatalysts.
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
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Li Li,Xinhong Chen,Xia Xiong,Xiaoping Wu,Zinan Xie,Zuohua Liu
The development of a simple and environmentally friendly method to synthesize hollow TiO 2 structures is urgent for realizing high NIR reflectance and low thermal conductivity . Hollow TiO 2 @SiO 2 structures have been successfully synthesized by a recycling template method. The synthesis process involves four steps as follows: 1) preparation of SiO 2 spheres, 2) synthesis of SiO 2 @TiO 2 core-shell structure by coating mesoporous TiO 2 shell on SiO 2 and crystallization by calcination , 3) etching the SiO 2 @TiO 2 to form the hollow TiO 2 spheres, and 4) coating the hollow TiO 2 spheres with a SiO 2 protection layer to produce hollow TiO 2 @SiO 2 structures. The SiO 2 serves as a template to support and synthesize hollow TiO 2 shell, and then after being etched, to form a Na 2 SiO 3 solution as a coating agent to protect TiO 2 shell from photocatalytic activity. The as-synthesized hollow TiO 2 @SiO 2 structures not only have high NIR reflectance, but also have a high thermal barrier performance due to the hollow structure. Moreover, the NIR reflectance of the coating made from hollow TiO 2 @SiO 2 reached 94.9%, and the temperature of the inner surface of the coating board is reduced about 16 °C, compared with the surface without coating. The weather resistance studies reveal that the hollow TiO 2 @SiO 2 sample is very stable under the UV irradiation. In particular, the hollow TiO 2 @SiO 2 structures synthesized by using this method shows multifunctional responses towards solar heat.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）