OPTICAL MATERIALS
·
2023
·
IF 3.9
Xiaoyan Zhao,Yongcheng Zhou,Hua Guo,Yuqi Zhai,Xianrui Zou,Donghui Wang
Titanium dioxide (TiO 2 ) has received widespread attention as high stability, low toxicity and costless photocatalyst , but it only exhibits photocatalytic activity under ultraviolet (UV) light. To improve TiO 2 photocatalytic efficiency, Bio-CaCO 3 /WO 3 /TiO 2 /(Ca,Y)F 2 :Tm,Yb was prepared. TiO 2 was combined with upconversion materials, coupled with WO 3 and loaded on oyster shell powder (Bio-CaCO 3 ), which showed that the prepared photocatalyst effectively reduce the band gap of TiO 2 , expand the photoreaction range of the material and avoid agglomeration, thus improving its photocatalytic efficiency and antibacterial efficiency. The photocatalytic degradation efficiency of Bio-CaCO 3 /WO 3 /TiO 2 /(Ca,Y)F 2 :Tm,Yb (50 mg) was 24.32% higher than that of TiO 2 /(Ca,Y)F 2 :Tm,Yb in 90 min. And its antibacterial rates against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) were enhanced by 38.68% and 25.89% compared to TiO 2 /(Ca,Y)F 2 :Tm,Yb, respectively.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Wei Wu,Jingyu Long,Yuanjun Guo,Xiaotao Zu,Sean Li,Xia Xiang
A surface acoustic wave (SAW) H 2 S gas sensor based on CuO-TiO 2 p-n heterojunction film was designed and fabricated. The sensor exhibits high sensitivity to H 2 S due to the significant current response of CuO-TiO 2 film to H 2 S gas and the appropriate work point of SAW sensor based on CuO-TiO 2 composite film. The linearity change for sensor frequency shift is strongly associated with the location of work point when the H 2 S concentration increases from 1 to 300 ppm. In addition, the porosity of CuO-TiO 2 film is beneficial to the efficient adsorption for H 2 S, leading to the higher frequency shift of the sensor. The SAW sensor also shows good selectivity and stability to H 2 S with stable frequency shift under different humidity levels.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jiayao Chen,Yuan Gao,Wenwen Yang,Zhiwei Li,Kun Xiong
Designing highly active and durable catalysts is considered to be crucial for enhancing hydrogen evolution reaction (HER) from water electrolysis . Although some studies indicate that anatase TiO 2 is a promising candidate for electrolytic hydrogen evolution reaction, the influence of different crystalline phases of TiO 2 on the supported Ru catalysts for electrocatalytic HER performance is rarely systematically explored. Herein, a series of Ru/TiO 2 -X (X = R (Rutile), A (Anatase), and P25) catalysts were prepared to investigate the influence of the rutile and anatase phases of TiO 2 on the catalytic activity of Ru catalysts in HER. The findings demonstrate that the HER activity is much affected by the variation of the titania structure, when other factors are kept constant. The 15Ru/TiO 2 -R-H 2 has superior HER performance with a small overpotential of 63 mV to achieve a current density of 10 mA cm −2 in acidic electrolyte and 99 mV in alkaline electrolyte compared to 15Ru/TiO 2 -A-H 2 and 15Ru/TiO 2 -P25-H 2 . This might be attributed to the faster electron transfer and lower Fermi level caused by the oxygen vacancy (V O ) and strong metal-support interaction (SMSI), along with the exposure of active sites afforded by the highly dispersed ruthenium nanoparticles on the rutile TiO 2 . Our results indicate that the presence of rutile TiO 2 support alone is adequate to maintain Ru in its most active form and make it a more performing catalyst, compared to anatase titania and P25.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 36
·19591-19604
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IF 11.9
Feng Long,Yuwei Chen,Haitian Chen,Xincheng Cao,Shiyu Wu,Yanju Lu,Peng Liu,Jianchun Jiang,Xiaolei Zhang,Junming Xu
Enhancing both the reactivity and stability of catalysts for the hydrogenation of bio-derived fatty acids is a formidable challenge. In this study, we developed a Ni-ReOx/TiO2 catalyst, featuring Ni metal clusters encapsulated by ReOx active sites anchored on the TiO2 surface, for the hydrogenation of bio-derived fatty acids. Remarkably, the Ni-ReOx/TiO2 catalyst with a relatively low Re loading (approximately 4.4 wt%) exhibited outstanding performance in fatty alcohol production at a reduced temperature of 165 °C (yield: 95.3%) and alkane production at 205 °C (yield: 100.0%), outperforming the Cu-ReOx/TiO2 catalyst. Density functional theory (DFT) calculations unveiled that the introduction of ReOx onto the anatase surface led to modifications in electronic distribution and enhanced the interaction between the support and the metal. By integrating the DFT calculations with experimental results, we elucidated the roles played by the Ni clusters and Re–O active sites in the Ni-ReOx/TiO2 catalyst: facilitating H2 dissociation, promoting acid adsorption, and ultimately contributing to acid hydrogenation conversion. The industrial-scale processes for alkane and alcohol production were designed and simulated using Aspen Plus, enabling a quantitative assessment of the remarkable reaction activity of the Ni-ReOx/P25 catalyst. Additionally, the Ni-ReOx/P25 catalyst demonstrated excellent stability over four recycling cycles, coupled with robust water tolerance, thus showcasing its immense potential for application in industrial fuel and fatty alcohol production.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Junyi Qian,Hao Hu,Ying Liang,Zhijie Zhang
Halide perovskite quantum dots (PQDs) have shown great promise for the photochemical conversion of CO 2 . However, the fast carrier recombination rates and inadequate adsorption/activation for CO 2 molecules have seriously restricted their practical application. Herein, an innovative step-scheme-based Cs 2 CuBr 4 /TiO 2 (CCB/TiO 2 ) photocatalyst was prepared by embedding Cs 2 CuBr 4 PQDs in a mesoporous TiO 2 matrix, which exhibits considerable potential as candidates for CO 2 photoreduction under simulated sunlight. Remarkably, the optimised CCB/TiO 2 photocatalyst delivered an impressive CO 2 reduction activity, which was 3.1 and 16.0 times higher than those achieved by pure Cs 2 CuBr 4 and TiO 2 , respectively. Furthermore, the S-scheme charge transfer mode was comprehensively corroborated by density functional theory (DFT) calculations, photo-assisted Kelvin probe force microscopy (KPFM), in situ irradiated X-ray photoelectron spectra (XPS), and electron spin resonance spectroscopy (ESR). On basis of theoretical calculations and in situ diffuse reflectance spectra (DRIFTS), the CCB/TiO 2 exhibited a reduced energy barrier of the rate-determining step, which facilitated the CO 2 photoreduction reaction.
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Analytical Methods
·
2023
·Vol. 15
·期 21
·2622-2630
·
IF 3.1
Liangyun Yu,Liangju Sun,Qi Zhang,Jingjing Zhang,Bairen Yang,Mingquan Huang,Yawen Zhou,Baocai Xu,Xiaoya Hu
This study developed an electrochemical sensor for the determination of Mn2+ in Chinese liquor by modifying a glass carbon electrode with TiO2-NH2@COFDPTB, which was synthesized via the controllable growth of COFDPTB onto the surface of TiO2-NH2 using the Schiff-base condensation reaction between 2,5-dimethoxyterephthalaldehyde and 1,3,5-tris(4-aminophenyl)benzene. The morphological and structural characterization studies of the proposed TiO2-NH2@COFDPTB were carried out by SEM, TEM, HRTEM, EDX, BET, XRD and FTIR techniques. Owing to the excellent properties and the synergism between TiO2 and COFDPTB, the introduction of TiO2-NH2@COFDPTB improved the electrochemical response significantly. By optimizing the experimental parameters, the sensor exhibited good linearity in the range of 0.1–1.0 nM and 0.08–10 μM with a detection limit of 2.83 × 10−11 M and 9.50 × 10−9 M, respectively, showing competitive performance for Mn2+ determination. Besides, the proposed sensor was successfully applied to Mn2+ detection in liquor samples, suggesting its practical application performance.
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Membranes
·
2023
·Vol. 13
·期 5
·514
·
IF 4.2
Yinghao Lin,Atian Xie,Jian Xu,Changguo Xue,Jiuyun Cui,Jianming Pan
Oil pollution caused by a large number of industrial activities and oil spill accidents has posed serious harm to the environment and human health. However, some challenges remain with the existing separation materials, such as poor stability and fouling resistance. Herein, a TiO2/SiO2fiber membrane (TSFM) was prepared by a one-step hydrothermal method for oil-water separation in acid, alkali, and salt environments. The TiO2nanoparticles were successfully grown on the fiber surface, endowing the membrane with superhydrophilicity/underwater superoleophobicity. The as-prepared TSFM exhibits high separation efficiency (above 98%) and separation fluxes (3016.38–3263.45 L·m−2·h−1) for various oil-water mixtures. Importantly, the membrane shows good corrosion resistance in acid, alkaline, and salt solutions and still maintains underwater superoleophobicity and high separation performance. The TSFM displays good performance after repeated separation, demonstrating its excellent antifouling ability. Importantly, the pollutants on the membrane surface can be effectively degraded under light radiation to restore its underwater superoleophobicity, showing the unique self-cleaning ability of the membrane. In view of its good self-cleaning ability and environmental stability, the membrane can be used for wastewater treatment and oil spill recovery and has a broad application prospect in water treatment in complex environments.
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CHEMICAL PHYSICS
·
2023
·
IF 2.3
Tingting Zhang,Haoming Chen,Chunhu Tan,Luo Li,Libin Zhang,Chang Liu,Weihua Li,Changqing Yan,Jiansheng Li,Rui Lu
The interaction mechanism between bovine serum albumin (BSA) and titanium dioxide (TiO 2 ) nanoparticles with different shapes, surface charge and hydrophobic properties was studied using multiple spectral methods and molecular docking simulation. UV–vis spectra showed that when BSA interacted with the four TiO 2 NPs, the TiO 2 nanoparticles and BSA formed a stable ground state complex. Fluorescence spectra showed that the binding capacities of four different types of TiO 2 nanoparticles with BSA are as follows: spherical TiO 2 (s-TiO 2 ) > rod-shaped TiO 2 (r-TiO 2 ) > positively charged TiO 2 (c-TiO 2 ) > hydrophobic TiO 2 (h-TiO 2 ). The results of synchronous fluorescence, circular dichroism (CD) and Fourier transform infrared (FTIR) spectroscopy revealed that s-TiO 2 , r-TiO 2 , and c-TiO 2 have a weak effect on the conformation of BSA, whereas h-TiO 2 has a greater effect. Molecular docking and MD simulations results show that the content of hydroxyl groups plays a key role in the binding capacity.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 9
·3747-3764
·
IF 3.3
Wei Pingping,Gao Juan,Cai Hanyong,Zheng Lingcheng,Wang Yanfen,Li Yang,He Gang
Z-type 2D/2D C, N, S co-doped TiO 2 /g-C 3 N 4 (DTCN) photocatalysts possessing high catalytic activity were prepared via a simple ultrasonic recombination method. The catalysts’ microscopic morphology, crystal structure, chemical composition, and optical properties were investigated with scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and ultraviolet–visible tests. The photocatalytic activity was also assessed via the degradation of the organic pollutant RhB. The results showed that DTCN could achieve 85.3% degradation of the target pollutant within 60 min, which was 2.47 times (34.5%) and 1.76 times (48.5%) more than TiO 2 and g-C 3 N 4 . The first-order kinetic constants of DTCN reached 0.02838, which was 4.11 and 2.66 times that of TiO 2 and g-C 3 N 4 . Nonmetallic C, N, S (CNS) co-doping effectively improved sunlight utilization of TiO 2 nanosheets through the generation of impurity bands in the forbidden band area. The Z-type heterojunction formed via the coupling of g-C 3 N 4 and CNS–TiO 2 promoted the separation of photoinduced carriers and improved the charge transfer efficiency, boosting the TiO 2 photocatalytic performance. Furthermore, the 2D–2D heterojunction provided a high-speed transport channel for charges. Graphical Abstract Z-type 2D–2D DTCN nanosheet heterojunctions were successfully fabricated. Nonmetallic CNS co-doped effectively improved sunlight utilization of TiO 2 nanosheets through the generating of impurity bands in the forbidden band area. Furthermore, the Z-type heterojunction formed via the coupling of g-C 3 N 4 and CNS–TiO 2 promoted the photoinduced carrier separation and improved the charge transfer efficiency, so boosting the TiO 2 photocatalytic performance.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Baofang Zhang,Ziyu Zengcai,Wenting Lin,Meijin Zhang,Yunhong Pi,Tiejun Wang
Photothermal synergism can effectively activate methanol at low operating temperature and significantly reduce the activation energy of the reaction, achieving more efficiently H 2 release from methanol reforming. Here, a novel hierarchical heterojunction that integrating photo- and thermal-active Cu 2 O catalytic species with in-situ derived NH 2 -MIL-125@TiO 2 framework was specifically designed for photothermal-driven aqueous phase reforming of methanol into H 2 . The afforded Cu 2 O/NH 2 -MIL-125@TiO 2 realized an outstanding photothermal H 2 production activity (apparent quantum efficiency of 22.3 % at 365 nm), ca. 13-times higher than that of thermocatalytic condition. Interestingly, the photothermal effect did confer the Cu 2 O/NH 2 -MIL-125@TiO 2 with unexpected activity at low temperature subsided to 100 °C and accelerated the activation of MeOH/H 2 O with an obvious reduction of activation energy from 82.62 kJ·mol −1 to 52.40 kJ·mol −1 . The improvement of catalyst stability and the promotion of charge separation also contributed to a long-term photothermal H 2 evolution activity with average rate of 1.49x10 6 μmolg Cu -1 h −1 and a total turnover number (TON) up to 5971 in 63 h, almost 125-fold promotion compared with Cu 2 O.
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RSC Advances
·
2023
·Vol. 13
·期 11
·7392-7401
·
IF 3.9
Jun Zhang,Xuxu Wei,Zifan Zhang,Caixia Yuan,Ting Huo,Fangfang Niu,Xiaoyu Lin,Chunli Liu,Hui Li,Zhenbin Chen
A magnetic chitosan/TiO2 composite material (MCT) was developed. MCT was successfully synthesized by a one-pot method using chitosan, TiO2, and Fe3O4. The absorption equilibrium time of MCT was 40 min in absorbing vanadium(V), the optimal adsorption pH was 4, and the maximum adsorption capacity of vanadium(V) was 117.1 mg g−1. The spent MCT was applied to photocatalytic reactions for reutilization. The decolorization rates for the degradation of rhodamine B (RhB) by new and spent MCT were 86.4% and 94.3%, respectively. The new and spent MCT exhibited absorption bands at 397 and 455 nm, respectively, which showed that the spent MCT was red-shifted to the cyan light region. These results indicated that the forbidden band widths of the new and spent MCT were about 3.12 and 2.72 eV, respectively. The mechanism of the degradation reaction showed that the hydroxyl radicals as oxidants in the spent MCT mediated the photocatalytic degradation of RhB. In addition, the superoxide anion radical formation of hydroxyl radicals was the main reaction, and the hole generation of hydroxyl radicals was the subordinate reaction. The N-de-ethylated intermediates and organic acids were monitored by MS and HPLC.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 19
·6284-6289
·
IF 4
Ning Zhang,Huili Li,Bo Yao,Shiyan Liu,Jun Ren,Yawei Wang,Zebo Fang,Rong Wu,Shunhang Wei
Construction of a heterojunction between quantum dots and TiO2 nanowire arrays via electrostatic self-assembly is rarely reported. In this work, mercury lamp irradiation was used to change the surface potential of WO3 quantum dots and TiO2 nanowire arrays, resulting in WO3 quantum dots tightly attached on the surface of TiO2 nanowire through electrostatic self-assembly. Photoelectrochemical measurements showed that the WO3 quantum dots formed a type II heterojunction with the TiO2 nanowire arrays rather than serving as carrier-trapping sites. In the self-assembly system, the TiO2 nanowire arrays provide a charge-transfer channel for the WO3 quantum dots, greatly improving the contribution of the WO3 quantum dots to the photocurrent. Quantitative calculations showed that the improvement of the bulk carrier-separation efficiency was the reason for the enhanced photoelectrochemical performance of the self-assembled system. The photocurrent density of the optical self-assembled system at 1.23 V (vs. RHE) was ∼5.5 times as high as that of the TiO2 nanowire arrays. More importantly, the self-assembled system exhibited excellent photoelectrochemical stability.
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