Nano Hybrids and Composites
·
2023
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IF 0.4
Yan Hua Lu,Min Min Xu,Chen Jie Zhang,Ya Xian Yuan,Jian Lin Yao
The rapid recombination of carriers on plasmon metal nanoparticles leads to relatively low efficiency of traditional photocatalysts. The combination of a metal and a semiconductor allows to the separation of hot electrons and holes to improve photocatalytic efficiency. In this study, Au nanoparticles were integrated with semiconductor TiO2 nanoparticles of different sizes to improve the photocatalytic activity. Various techniques have been developed to study the mechanism of catalytic activity, the significance of band bending in the space-charge region within metal–semiconductor nanocomposites, and the built-in electric field. The results provide theoretical and experimental evidence for the design of a high-performance surface plasmon resonance (SPR) photocatalyst. To reveal the interface band structure, surface-enhanced Raman spectroscopy (SERS) was employed to analyze the band structure of the TiO2–metal composites. This approach was based on the electrochemical Stark effect and a molecular probe strategy, combined with X-ray photoelectron spectroscopy (XPS), Electrochemical impedance spectroscopy (EIS), and other techniques at the molecular level. The results demonstrated that charge transfer occurred spontaneously between the Au nanoparticles and TiO2, and that the TiO2–metal interface constitutes a Schottky barrier. Moreover, the size of the TiO2 nanoparticles affects the degree of band bending. Optimal state matching was achieved with TiO2 (60 nm)–Au, improving the photocatalytic activity of the nanocomposite. The photocatalytic coupling reaction of p-aminothiophenol (PATP) acted as a probe to study the catalytic performance of TiO2–metal nanocomposites. The results revealed that the introduction of TiO2 improves the SPR catalytic activity of Au, mainly through the efficient separation of electrons and holes at the TiO2–metal interface.
研究领域:
材料科学
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化学
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DOI
高影响因子
SENSORS
·
2025
·Vol. 25
·期 10
·3195
·
IF 3.5
Cuiyan Han,Ziao Wang,Jiahong Cui,Shuqi Liu,Liu Yang,Yang Fu,Baolin Zhu,Cheng Guo
This article presents an integrated strategy that couples high-efficiency photocatalytic degradation with low-cost, rapid detection to overcome the main drawbacks of conventional TiO2-based photocatalysts, including a weak visible-light response, rapid charge–carrier recombination, and reliance on expensive instrumentation for dye concentration detection. Platinum-decorated TiO2(Pt/TiO2) was prepared by photoreduction deposition, and systematic characterization confirmed the successful loading of zero-valent Pt nanoparticles onto the TiO2surface, significantly improving charge separation and extending absorption into the visible region. Methylene blue degradation was quantified under ultraviolet (UV) and simulated sunlight; radical-scavenging tests clarified the reaction pathway. In parallel, smartphone images of the reaction mixture were processed in ImageJto extract red–green–blue (RGB) values, which were related to dye concentration through a partial least-squares (PLS) model validated against reference UV–Vis data. Pt/TiO2removed 95.0% of methylene blue within 20 min of UV irradiation and 90.2% within 160 min of simulated sunlight—31.8% and 19.1% faster, respectively, than pristine TiO2. The RGB-based PLS model achieved a coefficient of determination (R2) of 0.961 for the prediction set. By integrating photocatalysis with smartphone-based colorimetry, the proposed method enables rapid monitoring of organic dyes concentration, providing an intelligent and economical platform for industrial wastewater treatment.
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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DOI
PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Yixin Ji,Zhongmin Su,Xiaochun Cui,Zhi Geng,Chi Wang
In recent years, nanofiltration (NF) membranes have garnered significant attention for water treatment and reuse applications, owing to their high separation efficiency, surface charge characteristics, and other advantages. However, the conventional support layer structures in NF membranes exhibit high permeation resistance, limiting their overall performance. To address this issue, an ideal through-hole structural support layer effectively minimizes resistance to water infiltration. The advent of advanced high-precision 3D printing technology facilitates the fabrication of such structures. In this study, a support layer with a straight-through pore structure was fabricated using advanced high-precision 3D printing technology, and the PES-COOH active layer was attached to the surface of the support layer via hydrogen bonding, resulting in the PES-COOH@3DP NF membrane. This innovation substantially reduced the permeation resistance, thereby enhancing the permeation flux of the NF process. The permeability of the PES-COOH@3DP NF membrane reached 6.64 L·m −2 ·h −1 ·bar −1 , which is double that of the PES-COOH@UF NF membrane. By incorporating varying concentrations of TiO 2 nanoparticles (0.5 %, 1 %, 1.5 %) into the photosensitive resin material, a hydrophilic support layer doped with TiO 2 nanoparticles was printed using a 3D printer. This improved the NF membrane's hydrophilicity, thereby enhancing its permeation flux. When the feed solution contained 1000 mg·L −1 Na 2 SO 4 , the [email protected] % TiO 2 3DP NF membrane exhibited a permeability of 8.56 L·m −2 ·h −1 ·bar −1 , 1.5 times that of the PES-COOH@UF NF membrane and 22 % higher than the commercial NF90 membrane, while retaining 98.76 % salt and demonstrating strong chlorine resistance. This study underscores the significant potential of advanced high-precision 3D printing technology, establishing it as a strong contender for next-generation NF membrane desalination development.
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
ChemCatChem
·
2024
·
IF 3.8
Chengzhuo Yu,Jin Xu,Yarui Wang,Silong Wang,Li Xiong,Fanglan Geng,Zesen Shang,Huasheng Wu,Jitao Lv,Lixia Zhao,Yawei Wang
Graphical Untill now, reactive oxygen species (ROS) are difficult to generate in the natural light conditions, since most photocatalysts require external strong stimuli. We surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. The ROS generation patterns and mechanism of MIL-100(Fe)/TiO 2 was revealed by chemiluminescence (CL) and density functional theory (DFT). Reactive oxygen species (ROS), as one kind of the most highly oxidizing oxidants, are difficult to generate and utilize in the natural light conditions, since many materials require external strong stimuli for ROS release to be effective as pollutant degradation or biocide. In this work, we surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. Then ROS generation patterns and mechanism was revealed by chemiluminescence (CL) and density functional theory (DFT). Meanwhile, rhodamine B (RhB) can also be removed by MIL-100(Fe)/TiO 2 under natural light, which further evidence the ROS generation under the natural light. This work provides a new direction for spontaneously generating ROS releasing without external strong stimuli and has the broad potential applications in the field of pollutant degradation or antimicrobials under natural conditions.
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
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 6
·1732-1741
·
IF 3.174
Zhiguo Sun,Jiaming Fan,Run Feng,Menglu Wang,Yue Zhou,Li Zhang
BACKGROUND In recent years, the emission of volatile organic compounds (VOCs) from different sources has caused huge environmental problems. As a ‘green’ terminal treatment technology, photocatalytic technology is a competitive technology that has practical application prospects for the emission reduction of VOCs. The core problem of photocatalysis technology is constructing a photocatalyst with higher activity. RESULTS In this work, a new hierarchical heterostructured photocatalyst of TiO 2 /Bi/Bi 2 MoO 6 was facilely fabricated by solvothermal method with the TiO 2 nanoparticles uniformly distributed on the surface of flower-like Bi 2 MoO 6 nanospheres. Compared with the bare flower-like Bi 2 MoO 6 nanospheres, the band gap width of TiO 2 /Bi/Bi 2 MoO 6 is wider, which helps to improve the Fermi level-derived oxidation–reduction capacity of the catalyst. N 2 adsorption–desorption experiments show that the composite material has a larger specific surface area, which is beneficial to improve the mass transfer efficiency in the gas–solid heterogeneous reaction. Photocatalytic data display that, under irradiation by Xenon lamp for 2 h, the degradation rate of toluene gas over TiO 2 /Bi/Bi 2 MoO 6 reached 26.08%, which is 17.92% higher than that of the bare Bi 2 MoO 6 nanospheres. CONCLUSION These results indicate that coupling TiO 2 could significantly enhance the photocatalytic degradation effect of toluene over the hierarchical heterostructured TiO 2 /Bi/Bi 2 MoO 6 , and this has practical application prospects for the use of photocatalytic technology to treat VOCs pollution. © 2021 Society of Chemical Industry
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
CERAMICS INTERNATIONAL
·
2020
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IF 3.83
Zhenyu Tan,Kaixin Song,Hadi Barzegar Bafrooei,Bing Liu,Jun Wu,Junming Xu,Huixing Lin,Dawei Wang
In this paper, thermal stable Y 3 MgAl 3 SibO 12 -TiO 2 microwave composite ceramics were firstly fabricated by the high temperature solid phase reaction method. The influence of the sintering temperature , microstructure on microwave dielectric properties of Y 3 MgAl 3 SiO 12 by doping TiO 2 were investigated in detailed. TiO 2 addition reduced the ceramic sintering temperature and improved the distribution of grain size. The negative temperature coefficient of resonant frequency (τ f = −32 ppm/°C) of Y 3 MgAl 3 SiO 12 was adjusted to near zero value. 0.8Y 3 MgAl 3 SiO 12 -0.2TiO 2 ceramic sintered at 1475 °C for 6 h achieved the optimized microwave dielectric properties: ε r = 12.2, Q × f = 21,050 GHz, τ f = +5.2 ppm/°C, which indicated that 0.8Y 3 MgAl 3 SiO 12 -0.2TiO 2 is a potential candidate for dielectric patch antenna and substrate.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2019
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IF 4.63
Tingting Xu,Shulan Wang,Li Li,Xuan Liu
Semiconductor photocatalysis is considered as an effective sustainable technology to relieve the emerging global energy shortage issues, while how to design the efficient photocatalyst with enhanced light absorption, charge carrier separation and surface reaction is still a primary barrier for its applications. Herein, SrTiO 3 /TiO 2 /C (STC) heterostructure with tri-modal (micro-, meso-, macro-) pores integrated was synthesized via freeze casting combined with silica colloid as the hard template. Carbon was used as the photosensitizer for extending light absorption, electric field from SrTiO 3 /TiO 2 for enhancing charge carrier separation, and hierarchical pore structures for promoting surface reaction. Silica in different particle sizes was used to tune the pore structure of composites. The as-prepared STC sample reached the photocatalytic hydrogen production rate from water splitting as high as 2.52 mmol h −1 g −1 under UV irradiation, which is 1.5 times of benchmark catalyst P25. Its reactivity for methylene blue (MB) degradation is superior to the corresponding individual compositions and about 4.7 times of SrTiO 3 under UV light irradiation. The current work provides a feasible method to fabricate the hierarchical porous multi-component semiconductor based heterostructures with excellent photochemical performances, which develops our understanding for the design and fabrication of hierarchical porous catalysts.
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 COLLOID AND INTERFACE SCIENCE
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2016
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IF 3.782
Hui Feng,Niu Tang,Songbai Zhang,Bo Liu,Qingyun Cai
A novel (CdS-Mn/MoS 2 /CdTe)-sensitized TiO 2 nanotube arrays (NTAs) photoelectrode has been prepared by electrodeposite, successive ionic layer adsorption and reaction (SILAR) coupled with hydrothermal method . When a ZnS layer was added on the top of CdS-Mn/MoS 2 /CdTe/TiO 2 , a notable red-shift and high absorption was observed in the visible light region. The photocurrent density (mA/cm 2 ) systematically increases from TiO 2 NTAs (0.43), CdTe/TiO 2 (1.09), MoS 2 /CdTe/TiO 2 (1.80), CdS-Mn/MoS 2 /CdTe/TiO 2 (2.40), to ZnS/CdS-Mn/MoS 2 /CdTe/TiO 2 (3.41) under visible light irradiation, due to the type-II semiconductor heterostructures comprising multiple components with a staggered band offset. Such a heterostructure possesses an enhanced photocatalytic performance towards degradation of organic contaminant, e.g. P-Nitrophenol (PNP) and Rhodamine B (RhB) .
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materiomics
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2018
·
IF 0
Qionglian Yang,Mingyu Hu,Jun Guo,Zhenhua Ge,Jing Feng
s Ag/AgCl/TiO 2 nanocomposite was synthesized through the combination of sol-gel process and hydrothermal (HT) method followed by ion exchange method in the paper. Transmission electron microscope, UV–vis absorption property and X-ray diffraction were utilized to characterize the morphology, optical absorption property and phase structure of the as-prepared photocatalysts. The morphological and performance studies of Ag/AgCl/TiO 2 revealed that a well-interconnected mixed phase heterojunction photocatalyst was achieved through as-prepared TiO 2 and the subsequent ion exchange method. By the degradation of Rhodamine B under xenon lamp, Ag/AgCl/TiO 2 exhibited a significant enhancement in photocatalytic activity compared with TiO 2 and Ag/TiO 2 . The band gap of Ag/AgCl/TiO 2 can reach to 2.53eV compared with 3.22eV of the prepared TiO 2 . Furthermore, the synthesis process and photoreaction mechanisms of TiO 2 , Ag/TiO 2 and Ag/AgCl/TiO 2 photocatalysts were proposed. It demonstrated that the enhancement of photocatalytic was mainly due to the reducing of electron-hole recombination in Ag/AgCl/TiO 2 .
研究领域:
材料科学
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环境科学
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DOI
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Ruochong Zhang,Dan Qiao,Xuqing Liu,Zhiguang Guo,Litian Hu,Lei Shi
The dispersibility of TiO2 nanoparticles in polyalphaolefin (PAO) are improved by the interaction between the chemically modified TiO2 (denoted as TTO) and 1-methyl-2,4-bis (N-octadecylurea) benzene (MOB) gelator. Tribological tests show the outstanding friction-reducing and antiwear performances of PAO10–MOB–TTO under the common friction condition and higher temperature friction condition, respectively. The lubricating property of PAO10–1% MOB–0.5% TTO is further enhanced after UV irradiation for 40 min, which might be attributed to the photocatalytic effect of TTO under UV. The physical adsorption film is enhanced by the immobilization function of MOB. The chemical reaction film including various organic oxides and nitrides are produced for the active element in TTO and MOB. The antiwear performance is further improved by the “mending effect” of TTO with the good dispersibility. The combined effects of various factors promote the excellent lubricating performances of PAO10–1% MOB–0.5% TTO.
研究领域:
材料科学
·
机械工程
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Zhangxu Chen,Ming-Lai Fu
To extend the activities of TiO 2 to the near infrared (NIR) region and to separate and recycle photocatalysts easily is vital for the high harvest of solar energy for sustainable society. The magnetic NIR activated Fe 3 O 4 @SiO 2 /β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 (FS/UC/T) composites have been synthesized by using the solvothermal method by adding Fe 3 O 4 @SiO 2 and Degussa P25 into the mixed solution of NaOH, ethanol, oleic acid, Re(NO 3 ) 3 and NH 4 F. Moreover, the obtained composites were explored for photocatalytic applications. It was found that FS/UC/T emit UV–vis light under irradiation of 980 nm laser and efficient energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photodegradation experiments for treating methylene blue (MB), rhodamine B (RhB), methyl orange (MO) and colorless phenol were carried out to evaluate the photocatalytic activities of the samples. The photodegradation rates reach 76.62%, 68.48%, 30.05% and 27.16% for MB, RhB, MO and phenol under irradiation of 980 nm laser, respectively, which suggested magnetic FS/UC/T composite is an advanced NIR-driven photocatalyst. Moreover, the magnetic photocatalyst showed easy separation and good stability in the recycled tests. It suggested a promising system to utilize the NIR energy for photocatalysis based on TiO 2 and to utilize the magnetic for separation of photocatalysts, which will contribute to practical environmental remediation in the future.
研究领域:
材料科学
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环境科学
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光学
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DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-16
·
IF 12.264
Deng Baiwen,Xiang Zhen,Xiong Juan,Liu Zhicheng,Yu Lunzhou,Lu Wei
Sandwich-like laminated Fe&TiO 2 @C nanocomposites were successfully prepared from the MXene–MOFs hybrids.
A broad effective bandwidth of 6.5 GHz at a thickness of only 1.6 mm was achieved.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）