JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Quan Li,Xing Wang,Xiaolan Cui,Xin Liu,Wentai Wang
Hydrogen peroxide (H 2 O 2 ) is a major transmitter of redox signals during chemical processes. Cost-effective and easy-to-operate sensors for H 2 O 2 are in high demand in a variety of fields. A novel photoelectrochemical (PEC) sensor for H 2 O 2 detection was investigated, using BiOBr/TiO 2 NAs/FTO (BiOBr/TNAs) as a PEC electrode which is obtained by successive ionic layer adsorption and reaction (SILAR) method. This non-enzymatic PEC BiOBr/TNAs electrode shows excellent selectivity, stability, and reproducibility for H 2 O 2 detection in optimizing modes. The linear relationship is in a broad range from 4 to 1800 μM (R 2 = 0.994) and a detection limit of 0.65 μM (S/N = 3). In the detection of H 2 O 2 in apple juice and milk real samples, the BiOBr/TNAs show outstanding recovery ranging from 98.0 % to 102.0 %, indicating great potential in practical applications. Meanwhile, the p-n heterojunction formed between BiOBr and TiO 2 improves the utilization of visible light and effectively promotes the separation of photogenerated electrons and holes. This work provides a new strategy for the non-enzymatic detection of hydrogen peroxide in PEC mode.
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高影响因子
Particuology
·
2023
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IF 3.5
Ming Liu,Guoqiang Shao,Pengpeng Lv,Jun Li,Qingshan Zhu
Two critical parameters: Glossiness and chromaticity space of pearlescent pigments were evaluated based on crystallinity and grain size. Both the roughness and the vertical distance evolution along the surface of deposited TiO 2 film are affected by the crystallinity. The optimal crystallinity of TiO 2 was deposited at the temperature of 350 °C. The TiCl 4 concentration effectively changed the grain size. However, the high flow rate of fluidizing gas and optimal gas–solid ratio (<0.11 m 3 /(kg h)) restricted the change of TiCl 4 concentrations in fluidized bed reactor . In this case, the grain size of the deposited TiO 2 film was about 55 nm. Depending on the grain size, the color of pearlescent pigments was adjusted by controlling the film thickness based on TiO 2 concentration. Finally, the silver pearlescent pigment with high glossiness was prepared by chemical vapor deposition method in a fluidized bed reactor.
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高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Qianxiong Wen,Cong Zhao,Meilin Fu,Yusai Xu,Xiangjia Sun,Jiaying Zheng,Yanrong Liang,Weidong Xiang,Xiaojuan Liang,Zhaoping Chen
Phosphor-in-glass (PiG) has been prepared into various types of phosphor films owing to its simplicity process, exceptional color purity, and convenient color adjustability. Nevertheless, existing reflective PiGs films have encountered limitations in terms of stability and feasibility as reliable color converters, mainly attributed to issues related to thermal deposition and insufficient optical efficiency. Herein, we propose to use AlN substrate with superior thermal conductivity to coat the TiO 2 layer to obtain TiO 2 –AlN (TA), which enhances the reflectivity of blue light to facilitate the light conversion process. By incorporating highly thermally stable LuAG:Ce-PiGs on a TA substrate, the LuAG:Ce-PiTA converter exhibits a luminous flux of 1102 lm@6.4 W, and maintains a relative intensity of 94.6% at 473 K benefiting from the high thermal conductivity of 34.1 W/(m·K). The addition of CASN 3 :Eu to the color converter 50 L&10C-PiTA enables an impressive CRI of 90.7. Relative luminescence intensities of LuAG:Ce-PiTA and 50 L&10C-PiTA only decrease by 5.35% and 3.28%, respectively, in the 24 h illumination aging decay test of the reflective laser module. The results confirm the suitability of the optimally designed TA substrate for LuAG:Ce color converter applications in high-power reflective laser illumination.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ruyue Guo,Yan Bao,Xi Zheng,Jie Chen,Hong Yang,Wenbo Zhang,Chao Liu,Jiachen Xu
The self-cleaning coating has both superhydrophobic physical and photocatalytic chemical self-cleaning properties, which has attracted the wide attention of researchers in recent years. First, the flower-like hollow SiO2@TiO2 spheres with oxygen vacancies (rFHSTs) were prepared by the liquid-phase reduction method, in which several different functional components were integrated. Meanwhile, the influence mechanisms of the physical structure and chemical composition on the photocatalytic properties are discussed in detail. The results proved that rFHSTs exhibited the enhanced photoresponse range and photocatalytic degradation performance in visible light because of the synergistic effect of the microstructure (internal cavity, 3D flower-like nanosheet), SiO2/TiO2 heterojunction structure, and oxygen vacancies. After that, superhydrophobic modified rFHSTs were used as fillers to fabricate PVA/PFDTS-rFHSTs composite coatings with both physical and chemical self-cleaning properties. The self-cleaning performances and principles of the composite coating were examined and explored. The results showed that the low surface energy of the hydrophobic chain segment, the inherent particle effect, and the photocatalytic activity of rFHSTs were responsible for the superhydrophobic and photocatalytic effects, finally endowing the composite coating with self-cleaning performance. In short, this study is profound for the development and application of self-cleaning coatings with both physical and chemical performances.
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高影响因子
Coatings
·
2023
·Vol. 13
·期 9
·1600
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IF 3.4
Huili Lei,Xuan Zhang,Si Chen,Chengbo Li,Guojiang Wan
Liquid phase deposition is a cost-effective and energy-efficient method for obtaining TiO2films at low temperatures. This work demonstrates the use of a multifunctional template consisting of grafted gallic acid (GA) and hexamethylenediamine (HD) on a Ti substrate to regulate the deposition of TiO2films. X-ray diffraction characterization shows that films deposited with the template have a more obvious anatase phase compared to direct deposition at 25 °C. The intensity of photoluminescence spectra also shows significant differences at 373.7 nm and 663.3 nm. Furthermore, electrochemical measurements indicate that TiO2films adjusted by the template have excellent electrochemical conversion properties. This proposed method provides a new simple route for fabricating TiO2films that are adjusted by GAHD templates, which may have good applications in the fields of semiconductor materials and biological materials.Keywords:titanium dioxide;GAHD;template adjusted deposition;liquid phase deposition
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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.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Ting Qu,Xue Hu,Ying Ou,Jie Wang,Fuqiang Hu,Jing Ni,Fan Cheng,Chunli Gong,Hai Liu
Robust metallic doped semiconducting networks of precise organization, over large scales and small dimensionality, hold great application potential in the basis of photocatalytic materials. Herein, a facile method to fabricate robust Au@TiO2 hierarchical nanoporous network films is reported, which is templated by thermally stable poly(4-vinylpyridine)-block-poly{11-[4-(4-butylphenylazo)phenoxy]undecyl methacrylate} (P4VP-b-PMA(11C)Az) liquid crystalline (LC) block copolymers (BCPs). A P4VP100-b-PMA(11C)Az15 thin film can self-assemble to form ∼50 nm orderly packed PMA(11C)Az periodic spheres in the P4VP matrix via a solvent-annealing process. When these spherical P4VP100-b-PMA(11C)Az15 films with different thicknesses were exposed to the sol–gel titania precursors alcohol solutions with titanium(IV) isopropoxide (TIPT) and titanium tetrachloride (TiCl4; mass ratio, 3:1), titania was well-formed in the P4VP phase during the calcination process. After a further deposition–precipitation (DP) process, ∼10 nm Au nanoparticles were homogeneously doped in robust TiO2 nanoporous network films. The photocatalytic performance of the obtained robust Au@TiO2 films was studied in detail. It displays significantly enhanced visible light photocatalytic activity. The enhancement mechanism was ascribed to the injection of hot electrons of photoexcited Au nanoparticles to robust porous TiO2 films, which was confirmed by 420 nm Xe laser-induced fast photodegradation of rhodamine B.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jinxiu Cai,Lingbo Zong,Kaicai Fan,Fuxiang Song,Jianyang Gao,Zumin Wang,Yanan Chen,Lei Wang
Due to energy crisis and environmental pollution, it is urgent to develop efficient and cheap catalysts for hydrogen production from water electrolysis. As a cheaper platinum group metal , Ru , a cheaper platinum group metal, is a highly competitive candidate to Pt because of the similar bond energy of M-H. Herein, TiO 2 @nitrogen-doped carbon composite supported superfine Ru nanoparticles was synthesized by high temperature shock in a Joule furnace using Ti-MOF support (Ru/TiO 2 @NC-J). In the extremely rapid process, MOF was quickly converted into highly conductive nitrogen-doped carbon with tiny TiO 2 dispersed in it, and superfine Ru nanoparticles were generated simultaneously in less than 0.5 s. The obtained Ru/TiO 2 @NC-J displays wonderful HER performance in the wide pH range. In 1.0 M KOH solution, the overpotential was as low as 11 mV at 10 mA cm −2 and a Tafel slope was 39.2 mV dec −1 , which far exceeded the activity of Pt/C and conventional calcined samples as well as most of the recently reported catalysts. The as-developed electrocatalysts also showed excellent stability to accommodate large working current for long term test without obvious activity loss in universal pH range. Experimental investigations suggest that the strong metal-support interaction dominantly facilitate the activity of electrocatalytic hydrogen evolution reaction (HER), and stability of Ru/TiO 2 @NC-J. This strategy provides a new and super-fast methodology to prepare low-budget and high-performance HER catalysts for practical applications.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shengwang Chen,Xiaoli Sheng,Yanyun Wang,Pingping Yu,Chenghan Yang,Xian Zhang,Hao Fang,Yiwei Zhang,Yuming Zhou
Nitrogen-rich C 3 N 5 has emerged as a promising visible light catalyst due to its narrow band gap. Nevertheless, its practical application is hindered by the rapid recombination of photogenerated carriers. To address this limitation and enhance the photocatalytic performance of C 3 N 5 -based photocatalysts, one effective measure involves the construction of heterojunctions in conjunction with other semiconductors. In this work, the C 3 N 5 /TiO 2 S-scheme photocatalysts was constructed by matching C 3 N 5 with a more negative conduction band (CB) and TiO 2 with a more positive valence band (VB). Photoelectric tests exhibited that the prepared photocatalysts possessed enhanced visible light photoresponsivity as well as excellent charge separation and transport efficiencies. The characterization results of XPS and EPR confirmed that the existence of internal electric field and the unique S-scheme charge transfer mechanism, which achieves overall spatial separation of effective photogenerated carriers and accelerates the recombination of redundant electrons and holes. The photocatalytic hydrogen production performance of the TCN2 is 6.9 times and 30 times higher than that of C 3 N 5 and TiO 2 , respectively, which is ascribed to the unique charge transfer mechanism of the S-scheme heterojunction and significantly enhanced photocatalytic activity. The simple construction of S-scheme heterojunctions in this work provides a new strategy for research in other fields.
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ANALYTICAL CHEMISTRY
·
2017
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IF 6.32
Xue Li,Lusheng Zhu,Yunlei Zhou,Huanshun Yin,Shiyun Ai
A novel photoelectrochemical (PEC) assay is developed for sensitive detection of protein kinase A (PKA) activity based on PKA-catalyzed phosphorylation reaction in solution and signal amplification strategy triggered by PAMAM dendrimer and alkaline phosphatase (ALP). In this strategy, it is noteworthy at this point that PKA phosphorylation was achieved in solution instead of on the surface of the electrode, which has advantages of the good contact in reactants and simple experimental procedure. For immobilizing the phosphorylated peptide (P-peptide) on electrode surface, graphite-like carbon nitride (g-C3N4) and titanium dioxide (TiO2) complex is synthesized and characterized, which plays a significant role for TiO2 conjugating phosphate groups and g-C3N4 providing PEC signal. Subsequently, PAMAM dendrimer and ALP can be captured on P-peptide and TiO2/g-C3N4 modified ITO electrode via interaction between the -COOH groups on the surface of PAMAM dendrimer and the -NH2 groups of peptide and ALP, which can lead to the increase of ALP amount on the modified electrode surface assisted with the PAMAM dendrimer. As a result, the amount of ALP catalyzes of L-ascorbic acid 2-phosphate trisodium salt (AAP) to produce electron donor of ascorbic acid (AA), resulting in an increased photocurrent. The proposed detection assay displays high selectivity and low detection limit of 0.048 U/mL (S/N = 3) for PKA activity. This biosensor can also be applied for the evaluation of PKA inhibition and PKA activity assay in cell samples. Therefore, the fabricated PEC biosensor is potentionally well in PKA activity detection and inhibitor screening.
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高影响因子
ACS ES&T Engineering
·
2023
·
IF 7.1
Haifang Mao,Mengli Xu,Shuangjun Li,Yuqing Ren,Yun Zhao,Jun Yu,Qizhong Zhang,Wenshu Zhao,Gui Zhang,Lan Yan,Zhenmin Xu,Zhenfeng Bian
The activation of surface lattice oxygen is crucial for designing highly efficient photocatalysts for volatile organic compound (VOC) purification. Herein, the Pt/TiO2–x catalyst with abundant oxygen vacancies was successfully prepared via the pyrolysis of the Pt-modified Ti metal–organic framework (MOF) under an air atmosphere. Detailed experimental results and density functional theory calculations revealed that the introduction of oxygen vacancies modulated the electronic configuration of the Pt site and enhanced the charge transfer from Ti to Pt, which created an electronic metal–support Pt–Ti interaction interface (EMSI). The established Pt–Ti interface is favorable for the activation of the surface lattice oxygen adjacent to the Pt site [identified by H2 temperature-programmed reduction (TPR), electron paramagnetic resonance (EPR), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS)] and subsequently facilitates toluene oxidation via a direct ring opening process. This study offers a promising strategy for the design of high-performance photocatalysts for VOC oxidation.
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CHEMOSPHERE
·
2023
·
IF 8.8
Xue Bai,Xuan Dao,Qin Wang,Jiangna Xing,Ting Wang,Xin Huang,Hongxun Hao
Tetracycline (TC) as a common antibiotic has adverse effects on human healthy and biological survival. In this study, a novel MXene/TiO 2 /Fe hybrid was designed and successfully synthesized by combination method of calcination and hydrothermal reduction. The photocatalysts were characterized by PXRD , SEM , TEM , VSM and XPS, etc. It was found that MXene/TiO 2 /Fe exhibited 2D multilayer structure like MXene. The in-situ synthesized TiO 2 through calcinating MXene exhibited an octahedral biconical structure with exposed (001) and (101) facets. Surface heterojunction of (001) and (101) facets was formed within TiO 2 , which enhanced the separation of photogenerated electrons and holes. The residual MXene could play a role in co-catalyst to capture the photo-generated electrons from TiO 2 . Moreover, Fe nanoparticles not only optimize the band gap structure and increase the specific surface area, but also store the electrons as a good electrons acceptor, which further promote the separation of electrons and holes. The TC removal efficiency of optimal MXene/TiO 2 /Fe could reach 92% within 120 min. Moreover, the influence of external environment factors such as pH, catalyst dosages and common anions were investigated in detail. Mechanism analysis show that h + , •OH and •O 2 − are the main active substances. Finally, the degradation pathways were proposed according to LC-MS.
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高影响因子
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