APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Yang Zhang,Xintong Zhang,Dan Wang,Fangxu Wan,Yichun Liu
Introducing appropriate amount of oxygen vacancies by hydrogenation treatment is a simple and efficient way to improve the photoelectrochemical performance of nanostructured oxide photoanodes. However, the hydrogenation effect is often not durable due to the gradual healing of oxygen vacancies at or close to surface of photoanodes. Herein, we tackled the problem by conformal coating the hydrogenated nanoporous BiVO 4 (H-BiVO 4 ) photoanode with an ultrathin layer of amorphous TiO 2 . Photoelectrochemical measurements showed that a 4 nm-thick TiO 2 layer could significantly improve the stability of H-BiVO 4 photoanode for repeated working test, with negligible influence on the initial photocurrent compared to the uncoated one. Mott–Schottky and linear sweep voltammetry measurements showed that donor density and photocurrent density of the H-BiVO 4 electrode almost decayed to the values of pristine BiVO 4 electrode after 3 h test, while the amorphous TiO 2 -coated electrode only degraded by 6% and 5% of the initial values respectively in the same period. The investigation thus suggested that the amorphous TiO 2 layer did protect the oxygen vacancies in H-BiVO 4 photoanode by isolating these oxygen vacancies from environmental oxygen, while at the same time not impeding the interfacial charge transfer to water molecules due to its leaky nature.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yaru Li,Zhongmin Liu,Yongchuan Wu,Jitao Chen,Jingyu Zhao,Fengmin Jin,Ping Na
Carbon dots-TiO 2 nanosheets (CDs-TNs) composites were synthesized by hydrothermal method and applied for the first time in photoreduction of Cr(VI) under sunlight illumination. The materials were characterized by transmission electron microscope, X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectrometer, and X-ray photoelectron spectroscopy analysis. The results confirmed that CDs are successfully incorporated with TNs through Ti O C bonds. With the introduction of CDs, CDs-TNs composites exhibit excellent photoreduction performance of Cr(VI), which is higher than that of TNs, P25 and CDs-P25. The unique upconversion property and electron transfer property of CDs play essential roles on light harvesting and charge carriers transferring in the photoreduction process. Most importantly, CDs could facilitate the formation of H 2 O 2 , leading to the consumption of holes. As a result, the recombination of photoinduced electron-hole pairs is hindered and photoreduction activity of CDs-TNs is promoted.
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Molecular Catalysis
·
2017
·
IF 0
Wenwen Ma,Yan Xu,Kaiwen Ma,Yuhui Luo,Yushuang Liu,Hong Zhang
PW 11 Sn/TiO 2 (PW 11 Sn = (OTA) 3 PW 11 SnO 39 , OTA = octadecyl trimethyl ammonium) nanofibres with tunable rutile/anatase phase have been successfully prepared via combining with electrospinning and hydrothermal method . The crystal phase of TiO 2 was influenced by the loading amount of PW 11 Sn and the desulfurization efficiency was related with the crystal phase of TiO 2 . When the loading amount of PW 11 Sn on TiO 2 nanofibres was 50%, DBT could be completely removed using 0.02 g PW 11 Sn/TiO 2 nanofibres as catalysts and [Bmim]PF 6 as extraction agent at 60 °C within 20 min, when O/S value was 6:1. Furthermore, the influences of different morphologies and preparation methods for catalysts on desulfurization efficiencies were investigated in detail. This catalyst can be recovered easily and reused at least 7 times maintaining the catalytic activity. For different substrates, the efficiencies of sulfur removal decreased as the following orders: DBT > 4,6-DMDBT > BT under the same conditions. Finally, the mechanism of desulfurization was also elucidated.
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MICROCHEMICAL JOURNAL
·
2024
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IF 4.9
Yanling Liu,Yuying Chen,Xiaping Zhu,Ping Zhao,Wei Ren
The magnetic solid phase extraction material (MnFe 2 O 4 @TiO 2 ) was prepared by coating TiO 2 on MnFe 2 O 4 through an in-situ formation method. The structure and properties of MnFe 2 O 4 @TiO 2 were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), nitrogen adsorption–desorption experiment, and vibrating sample magnetometer (VSM). The conditions for magnetic solid phase extraction (MSPE) of quinolone antibiotics were optimized, and an MSPE-HPLC method was established to determine quinolone antibiotics in water samples. The optimal conditions for MSPE are MnFe 2 O 4 @TiO 2 amount of 15 mg, extraction time of 15 min, 5 mL of methanol solution with 20 % ammonia as eluent, and elution time of 1 min. Under the optimal conditions, 50 mL 0.1 mg/L mixed standard solutions of fleroxacin, ofloxacin, norfloxacin, ciprofloxacin, and enrofloxacin have achieved enrichment multiples of 67.8, 72.1, 59.6, 55.8, and 60.7, respectively. The linear range of five antibiotics determined by MSPE-HPLC is 0.004–1 mg/L with the relative standard deviations (RSDs) of 2.1 %–4.9 % and the limits of detection (LODs) of 0.0006–0.0020 mg/L. The method is applied to the determination of the five antibiotics in rice paddy water and fish pond water; the recoveries range from 78.9 to 105.8 %, and the RSDs (n = 5) are 3.6 %–8.7 %.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shuai Yan,Sen Wang,Gaobin Liu,Qi Yuan,Kuoming Song,He Zhao,Xin Li,Rongzheng Shen
Herein, MgO–12 % TiO 2 (w) ceramics with different contents of Bi 2 O 3 –CuO sintering aid were prepared using a solid-state method. The effects of the sintering aid content on the sintering temperature and the dielectric and mechanical properties of the ceramics were studied. The material was characterized using scanning electron microscopy and X-ray diffraction and Precision LCR tester and universal testing machine and Archimedes drainage method. When the Bi 2 O 3 –CuO content was less than 9 wt%, the ceramic sample has higher dielectric properties. When the Bi 2 O 3 –CuO content was greater than 9 wt%, the dielectric properties will deteriorate. This is because Bi 2 O 3 participates in the chemical reaction between MgO and TiO 2 , forming a high dielectric loss Bi 4 Ti 3 O 7 phase. At high temperatures, Cu 2+ can easily change valence to Cu + , promoting oxygen vacancies and increasing dielectric loss in ceramic samples. The introduction of Bi 2 O 3 –CuO produces new MgTiO 3 , Mg 2 TiO 4 , and Bi 4 Ti 3 O 12 phases in the sample structure, resulting in a structure in which the MgO grains in the sample are surrounded by the new phases that appear around them. This structure fills the pores, increases density, enhances mechanical properties. The dielectric properties of the ceramics were the when the sintering temperature was 1050 °C, and the Bi 2 O 3 –CuO content was 3 wt%. The dielectric constant and dielectric loss were 11.19 and 1.17 × 10 −4 , respectively. The bending strength of the ceramic sample increased from 138.72 MPa to 179.64 MPa when the Bi 2 O 3 –CuO content was increased from 3 wt% to 15 wt%. The Bi 2 O 3 –CuO sintering aid enables MgO to be better applied in ceramic substrates.
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JOURNAL OF LIGHTWAVE TECHNOLOGY
·
2025
·
IF 4.8
Mingshi Song,Xili Jing,Zhiyong Yin,Shuguang Li
This paper designed a based on surface plasmon resonance (SPR) optical fiber type low crosstalk pH value and temperature sensor. The sensor has the ability to detect pH value and temperature simultaneously, and can overcome the error factor caused by temperature changes in the pH value detection process of optical fiber sensors. Sensor is based on a multimode fiber (MMF) fused with a coreless fiber (NCF) to build the sensing substrate. Ag was used as SPR excitation material and polyacrylic acid (PAA)/ chitosan (CS) composite membrane was used for pH detection. Compared with previous research on temperature compensation, the SPR cascade sensing method treated by TiO2/PDMS composite membrane significantly improved the temperature sensitivity of SPR signals and reduced crosstalk. This ensures that the SPR signal has a sufficient working range. In the range of -10°C ∼ 100°C, the maximum temperature sensitivity can reach -4.1301 nm/°C, and the detection limit (DL) is 0.1542°C. In the pH range of 4.08 ∼ 9.85, the sensor's pH sensitivity can reach up to -17.9359 nm/pH, and the resolution is 0.1272pH. Excellent sensing performance. The sensor is important for advancing future applications of high-precision temperature compensation detection, high-sensitivity pH biodetection, and SPR modulation technology.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Jiang-Hao Lu,Ze Li,Di Zhang,Lu-Hang Song,Xiao-Yan Cai,Liang Mao,Zhi-Qiang Liu,Zhi-Jie Wang,Xiu-Quan Gu,Guo-Dong Yuan
The nano/microstructuring of silicon (Si) via chemical methods has garnered significant attention due to its excellent light-trapping capabilities across a wide spectral range. Current research has predominantly focused on the synthesis of pyramidal-shaped microtextures, which enable two reflections on the surface, while largely overlooking the superior light-trapping potential of inverted pyramid silicon (SiIP) microtextures, which theoretically allow for three reflections. Moreover, there has been limited investigation into the application of inverted pyramid black silicon for solar-driven hydrogen evolution. This study reports the synthesis of uniformly arranged inverted pyramid-textured black silicon using the copper-assisted chemical etching (Cu-ACE) method to enhance the efficiency of solar-driven water splitting for hydrogen production. The formation mechanism and the influence of copper-localized surface plasmon resonance (Cu-LSPR) from Cu nanoparticle (NP) byproducts on photoelectrochemical (PEC) activity were systematically analyzed. To reduce sidewall defects and minimize photogenerated carrier recombination, the surface of the SiIP was treated with tetramethylammonium hydroxide (TMAH). A vertical PN junction was developed through ion implantation to reduce the external bias of the SiIP. Additionally, a uniform TiO₂ antireflective layer was deposited via atomic layer deposition (ALD), reducing the average reflectance of the SiIP-T 4 to 5.78 % over the 300–1100 nm wavelength range. MoSₓ and Pt NPs were electrodeposited to improve the fill factor and enhance HER kinetics. With optimized catalyst loading, the n + p-SiIP-T 4 /TiO₂/Pt 80 mC electrode achieved a photocurrent density of 8.0 mA cm −2 at 0 V vs. RHE, an applied bias photon-to-current efficiency (ABPE) of 0.93 % at 0.24 V vs. RHE, and a double-layer capacitance (Cdl) of 91 μF cm −2 . The onset potential (Von) was positively shifted by ∼1.13 V to 0.49 V vs. RHE compared to a SiIP photocathode, and the photocathode operated continuously at 0 V vs. RHE for 27 h in an acidic electrolyte. These results demonstrate that SiIP has significant potential for PEC hydrogen evolution, with further performance optimization achievable through structural and surface engineering.
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POLYHEDRON
·
2024
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IF 2.4
Muhammad Jamshaid,Adeel Ahmed,Rashid Iqbal,Ali Fareed,Wedad A. Al-onazi,Mohamed S. Elshikh
The current study focuses on the development of highly efficient nickel oxide/titanium dioxide (NiO/TiO 2 ) p-n heterojunction catalysts constructed via sol–gel and ultrasonic techniques. Different techniques, including XRD, SEM, EDS mapping, and XPS, confirmed the successful synthesis of the photocatalysts. The BET analysis showed that the NiO/TiO 2 heterojunction has a surface area of 107.52 m 2 /g compared to pure NiO and TiO 2 (75.37 m 2 /g and 89.13 m 2 /g) respectively. The catalyst was then implemented to decompose the antibiotic tetracycline (TC) in water under visible light. The outcomes revealed that the degradation rate of TC reached 97.69 % using NiO/TiO 2 , which is substantially greater than the degradation achieved with pure NiO (52.43 %) and TiO 2 (71.11 %) within a 48-minute period pursuant to the most favorable circumstances. The initial rate constant of the NiO/TiO 2 (0.0756 min −1 ) was significantly higher compared to that of the NiO (0.0153 min −1 ) and TiO 2 (0.0261 min −1 ). The lower bandgap energy of the NiO/TiO 2 (3.19 eV) catalyst compared to the pure NiO (3.58 eV) and TiO 2 (3.29 eV) facilitated the abatement of TC due to the improved harvesting of visible light absorption. Furthermore, the study investigated the impact of several different reaction parameters and intervening anions on TC degradation. Radical trapping investigations substantiate the existence of reactive oxygen species. In addition, NiO/TiO 2 catalyst exhibited extraordinary stability and maintained its catalytic efficiency despite enduring five successive cycles. Overall, the NiO/TiO 2 catalyst demonstrated remarkable potential for abolishing TC-contaminated water.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 2
·1-17
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IF 2.4
Gan Wei,Guo Yan,Zhu Dan,Ling Min,Jiang Can,Zhang Shengfu
With the increasing problems caused by water pollution, the use of photocatalytic oxidation to remove pollutants from wastewater is a sustainable strategy. However, it is challenging to develop well-designed photocatalysts with high photo-quantum efficiency and the comprehension of their photocatalytic reaction mechanisms. Herein, a R/A-TiO 2 /Ti 3 C 2 T x (R: rutile; A: anatase) photocatalyst with different ratios of rutile and anatase phases was prepared by a facile hydrothermal method. The results showed that the number of rutile and anatase phases could be readily regulated by adjusting the dosage of titanium isopropoxide (TTIP) and Ti 3 C 2 T x . The prepared R/A-TiO 2 /Ti 3 C 2 T x -0.2 contained a mass fraction of 42% rutile phase and 58% anatase phase, with the interface between the two phases exhibited a tightly bonded structure. Meanwhile, the heterojunction between the heterophase TiO 2 and Ti 3 C 2 T x interfaces improved the photo-quantum efficiency of R/A-TiO 2 /Ti 3 C 2 T x , and the degradation efficiency of Rhodamine B (RhB) by R/A-TiO 2 /Ti 3 C 2 T x -0.2 was 77.82% in 2 h under ultraviolet light illumination. Ultimately, the active species capture experiments verified that the primary active species in the photocatalytic reaction was h + , ·OH, and·O 2 − . This work could shed light on the new approach to the rational design of high-efficiency heterophase TiO 2 -based photocatalysts. Graphical R/A-TiO 2 /Ti 3 C 2 T x photocatalysts with heterojunctions were controllably synthesized by an EDTA-2Na-assisted hydrothermal method.
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LANGMUIR
·
2025
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IF 3.9
Huiyu Yang,Rong Chen,Guowen Yu,Xiaohua Cheng,Liangang Zhao,Hai Liu,Bo Deng,Zushun Xu,Chunli Gong
Daytime radiant cooling achieves a sustainable cooling effect by reflecting sunlight and radiant heat. However, absorption of sunlight by emitters and parasitic heat gain can significantly reduce radiative cooling temperatures. To improve the light reflectivity and emissivity in the mid-infrared band, SNF@TiO2 aerogel with high stability and efficient radiative cooling effect was constructed using nanosilk and titanium dioxide. The hierarchical structure of the aerogel stores more air, which reduces the thermal conductivity (0.0333 W·m–1·K–1) and parasitic heat gain. TiO2 provides excellent UV resistance while increasing solar reflectance and atmospheric window emissivity. The average solar reflectance and average IR emissivity of SNF@TiO2 were 89.4 and 92.3%, respectively. Compared with the subambient (I: 800 W·m–2, PE-covered air) temperature, the average cooling temperature of SNF@TiO2 under direct sunlight reached 11.5 °C. Meanwhile, the outdoor subambient (I: 900 W·m–2, PE-covered air) average temperature drop of SNF@TiO2 reached 12.1 °C after UV (40 mW·cm–2) continuous radiation for 10 days (6 h per day), displaying highly stable radiative cooling properties. In addition, the SNF@TiO2 aerogel has good mechanical elasticity and thermal insulation properties. This study offers great potential for silk fiber materials for outdoor radiant heat management.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
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IF 2.7
Guangyu Deng,Chunmiao Xia,Xiangyu Nie,Sheng Xu,Cuige Zhang,Yinsheng Fang,Rongli Zhang
Photocatalytic degradation is a promising way for removing industrial pollutants from wastewater. However, selective enrichment and removal of target pollutants especially at ultralow concentrations are extremely challenging. Herein, a highly selective and efficient strategy for photocatalytic degradation of an organic pollutant, p-nitrophenol (PNP), is developed based on photosensitive molecularly imprinted polymer nanoparticles and TiO2 photocatalyst functionalized fiberglass cloth (FGC). The negatively charged p-nitrophenol@photosensitive random copolymer nanoparticles (PNP@PAVE NPs) and the positively charged TiO2 NPs were used as building blocks to successively deposit on the surface of FGC, followed by the removal of the PNP through UV radiation, leading to the formation of PNP-MIP NP and TiO2 NP decorated FGC (TiO2/PNP-MIP NPs/FGC) with high selectivity and photocatalytic activity. As a result, TiO2/PNP-MIP NPs/FGC exhibited a removal rate of 98.7% and excellent selectivity for PNP. This work provides a valuable approach for realizing highly selective degradation of specific pollutants in complex pollutant mixtures in a real environment.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lei Wang,Yilun Gao,Jianjun Luo,Wenyang Xu,Chi Zhang,Hua Yuan,Yaopeng Zhang,Yaokun Pang
Biodegradable or eco-friendly triboelectric materials from natural polymers are considered promising and viable alternative for the development of green triboelectric nanogenerators (TENGs). Yet, they are mostly struggling from poor mechanical properties and low triboelectric output performance. In this work, we developed a highly efficient NH 2 -MXene/TiO 2 @sodium alginate (NMTS) composite film with NH 2 -MXene/TiO 2 as a filler and sodium alginate (SA) as a matrix and a TENG based on this composite film (NMTS-TENG) was constructed. The tribo-positive characteristic of SA was enhanced by adding NH 2 -MXene and TiO 2 . Different loaded content of the NH 2 -MXene and TiO 2 were explored and optimized to improve mechanical properties of the composite film and the output performance of NMTS-TENG. The microstructure and dielectric constant of the composite films were well characterized to investigate the enhancement mechanism. Under optimal conditions, the tensile strength of the composite film reaches up to 175.0 MPa and surpass the pure SA film. The NMTS-TENG shows the output performance with an open-circuit voltage of 357.6 V and short-circuit current of 55.1 µA, and the output peak power increases by 9.3 times compared with pure SA-based TENG. In addition, we developed a TENG device to harvest ocean wave energy for self-powered cathodic protection. The electrochemical test results reveal that the open circuit potential of the protected Q235 carbon steel can decrease by 74 mV and the corrosion potential decrease by 146.5 mV, indicating the good anti-corrosion properties. This study provides a promising method to develop high-performance biomaterials based TENG and expands the practical application of SA in the field of the electrochemical cathodic protection.
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