Materials Research Express
·
2019
·Vol. 6
·期 8
·085020
·
IF 1.449
Hexi Zhao,Yan Wu,Hui Nan,Yonglong Du,Guijun Yang,Gang Wang,Huiyuan Chen,Haomin Wei,Hong Lin
TiO2-ZnO, TiO2-Fe2O3, TiO2-NiO binary heterojunction nanocomposites were synthesized by hydrothermal method using tetrabutyl titanate (TBT) as titanium source. Phase composition, microscopic shape ,functional group characteristics and optoelectronic properties of samples were characterized by x-ray diffractometry (XRD), transmission electron microscopy (TEM), photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS), cyclic voltammetry(CV),electrochemical impedance spectra(EIS) and Tafel polarization curve(Taf). The photocatalytic properties of TiO2, TiO2-ZnO, TiO2-Fe2O3 and TiO2-NiO were analyzed by the ability of degradation of methyl orange under visible light irradiation. The experimental results show that the binary heterojunction nanocomposites have been successfully constructed to promote the separation of photogenerated electron-hole pairs and improve the photoelectric performance. The photocatalytic results show that TiO2-NiO exhibits the best photocatalytic performance due to the difference in light utilization efficiency and charge transfer characteristics, which is consistent with the charge transfer resistance of TiO2 > TiO2-ZnO > TiO2-Fe2O3 > TiO2-NiO in EIS results. At the same time, the degradation kinetics of methyl orange (MO) in TiO2-NiO binary heterojunction nanocomposites under visible light irradiation is faster than other samples that can be completed in 160 min. The results show that TiO2-NiO binary heterojunction nanocomposites have broad application prospects in water treatment and wastewater treatment.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2015
·
IF 1.998
Xinying Qi,Ge Su,Guoshuai Bo,Lixin Cao,Wei Liu
NiO and NiO/TiO 2 films were prepared on fluorine doped tin oxide (FTO) coated glass substrates by electrochemial deposition and sol–gel method. Choline chloride–urea ionic liquid was used as electrodeposition media. The composition, morphology and microstructure of the films were characterized by a scanning electron microscope (SEM) and X-ray diffractometer (XRD). Cyclic voltammetry (CV), cycle life, response time and transmittance of the films were measured and compared with each other. Photocatalytic activity of the NiO/TiO 2 film was examined and explained through the degradation of methyl orange. Results show that, after 8000 cycles, both NiO and NiO/TiO 2 films still maintain their good electrochromic property and stability. The NiO/TiO 2 film not only performs excellent electrochromic function but also displays a certain photocatalytic activity. And interestingly, the NiO/TiO 2 film at bleached and colored states demonstrates different photocatalytic activities, which are higher than that at as-prepared state.
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xiaoyu Li,Yujia Han,Yike Huang,Jian Lin,Xiaoli Pan,Ziang Zhao,Yanliang Zhou,Hua Wang,Xiaofeng Yang,Aiqin Wang,Lin Li,Botao Qiao,Xiaodong Wang
Selective methanation of CO (SMET) is promising for deep removal of low-concentration CO in excess H 2 . However, the development of suitable catalysts applied in practical conditions remains a great challenge. Here we report a general strategy to develop highly efficient SMET catalysts by using hydrogenated TiO 2 (H-TiO 2 ) as support. The H-TiO 2 supported Ru catalysts can remove CO to below 10 ppm with greater than 50 % selectivity in a wide temperature range of 200−265 °C, with a good long-term stability. Detailed characterizations including operando spectroscopy and in-situ XPS combined with DFT calculation revealed that the lowered Ru valance on H-TiO 2 strengthens CO adsorption on both metal surface and metal-support interface which improved CO activation and inhibited CO 2 hydrogenation, respectively, leading to enhancement of both activity and selectivity.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Xiang Hongliang,Chen Xiaoyu,Huang Ye,Wu Chaochao,Mou Gang,Zheng Kaikui
This study investigated the fabrication of a strengthened Ti-TiO 2 material with adding 0.5 wt.% TiO 2 nanoparticles via selective laser melting process in comparison with CP-Ti. Through the process parameters optimized by response surface methodology, the Ti-TiO 2 material fabricated by SLM showed remarkable tensile strength of 800.6 MPa and elongation of 14%, as compared to the fabricated CP-Ti with tensile strength of 594.0 MPa and elongation of 21%. The x-ray diffraction patterns of fabricated specimens showed the expansion of the hcp -Ti lattice along the c -axis due to dissolved oxygen atoms from the decomposition of TiO 2 nanoparticles. The microstructure analysis observed remains of incompletely decomposed TiO 2 and TiO phases in SLMed Ti-TiO 2 material, which was distinguished from former studies. Consequently, the decomposition behavior of added TiO 2 nanoparticles associated with the dissolved oxygen in the Ti-matrix during the SLM process was discussed. Based on the evaluation of both the solution effect of oxygen atoms and the reinforcing effect of undecomposed nanoparticles, the dissolved oxygen from decomposed TiO 2 was considered the primary factor in the intensified strength of SLMed Ti-TiO 2 material. These results could offer novel insights into the additive manufacturing of high-strength and biocompatible titanium alloy via the SLM process.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Min Chen,Longgang Liu,Xueyan Chen,Xiaoxiao Qin,Kunlin Li,Jianghao Zhang,Xiaolei Bao,Lingjuan Ma,Changbin Zhang
The influence of metal particle size over heterogeneous catalysts on the catalytic performance has always been an interesting subject due to its significance from both fundamental and practical perspectives. In this work, we regulated the synthesis of TiO 2 by the hydrolysis of different titanium precursors, and as-prepared TiO 2 supports were employed to load Ru with impregnation method. Interestingly, we synthesized three Ru-TiO 2 catalysts with different Ru particle sizes of 1.1, 2.9 and 5.2 nm. The Ru-TiO 2 catalysts were next tested for CO 2 hydrogenation reaction, the results show that the medium Ru particles on TiO 2 exhibited the best CO 2 methanation activity. Based on the characterizations, we observed that the medium Ru particles exhibited the best redox properties compared with small and large Ru particles, which was beneficial to the H 2 dissociation; in addition, the medium Ru particles exhibited a moderate ability to activate CO 2 , resulting in the most favorable formation and decomposition of bidentate bicarbonate. Consequently, the Ru-TiO 2 catalyst with medium Ru particles showed the highest activity for CO 2 methanation. This study provides a new method to prepare Ru-TiO 2 catalysts with different Ru sizes and also presents an understanding of Ru particle size effects on CO 2 hydrogenation.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 8
·528
·
IF 3.8
Dongsheng Xiang,Zhihao Wang,Jingwen Xu,Hongdan Shen,Xiaodong Zhang,Ning Liu
Photocatalysts, such as TiO2, are widely used in photoreduction. However, drawbacks like their wide band gap and short carrier lifetime lead to lower efficiencies with their use. Introducing defects and forming heterostructures of TiO2could extend the carrier’s light-harvesting range from UV to visible light and enhance its lifetime. Herein, an electron-beam irradiation-defected TiO2was induced in MIL-88B(Fe). The structure of the material was characterized using XRD, FT-IR, TEM, HRTEM, and XPS techniques. Remarkably, TiO2under 300 kGy electron-beam irradiation performed the best with a series of 0, 100, 300, and 500 kGy irradiation ratios. PL and UV–vis DRS were utilized to measure the material’s optical properties. The introduction of MIL-88B(Fe) expanded the light response range, reduced the optical band gap, and lengthened the carrier lifetime of the defective TiO2composite photocatalysts, resulting in superior TC photoreduction capabilities of 88B5%300, which degraded 97% of tetracycline (10 mg/L) in water after 120 min.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Zhaonian Li,Daorong Li,Zhanzhao Feng,Shuqi Lv,Qingxuan Zhang,Yanru Yu,Ying Tian,Runfeng Huang,Hongxia Chen,Kunfeng Zhang,Hongxing Dai
WO 3 nanorods and x WO 3 @TiO 2 (WO 3 /TiO 2 mass ratio ( x ) = 1−5) photocatalysts were synthesized using the hydrothermal and sol-gel methods, respectively. The photocatalytic activities of x WO 3 @TiO 2 for NH 3 oxidation first increased and then decreased with a rise in TiO 2 content. Among them, the heterostructured 3WO 3 @TiO 2 photocatalyst showed the highest NH 3 conversion (58 %) under the simulated sunlight irradiation, which was about two times higher than those of WO 3 and TiO 2 . Furthermore, the smallest amounts of by-products (i.e., NO and NO 2 ) were produced over 3WO 3 @TiO 2 . The enhancement in photocatalytic performance (i.e., NH 3 conversion and N 2 selectivity) of 3WO 3 @TiO 2 was mainly attributed to the formed interfacial electric field between WO 3 and TiO 2 , which promoted efficient separation and transfer of photogenerated charge carriers. Based on the results of reactive species trapping and active radical detection, photocatalytic oxidation of NH 3 over 3WO 3 @TiO 2 was governed by the photogenerated holes and superoxide radicals . This work combines two strategies of morphological regulation and interfacial electric field construction to simultaneously improve light utilization and photogenerated charge separation efficiency, which promotes the development of full-spectrum photocatalysts for the removal of ammonia.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Xiaoning Zhang,Buning Chen,Jianwei Wang,Yusheng Zhou,Xueli Huang,He Huang
The high tolerance to feed oil makes slurry bed hydrocracking technology one of the main streams of research, but the relationship between hydrogenation and deactivation of slurry bed catalysts remains unclear. In this study, the distribution of vacuum residue (VR) hydrogenation products, coke generation, and catalyst deactivation patterns were analyzed using MoS 2 /TiO 2 as the hydrogenation catalyst. With an increase in the reaction temperature or decrease in the hydrogen pressure, the cracking performance gradually improved, the hydrogenation saturation effect gradually weakened, and the oil-to-coke ratio (OCR) gradually decreased. This implies that the influence of the lightning effect from coke generation gradually increased. The conversion rate of VR to gasoline and diesel components is 3.8 times higher than the conversion rate to coke and gas. At lower temperatures, coke was dominated by graphitic carbon encapsulated on the catalyst surface. As the temperature increased, the content and lamellar diameter of graphitic carbon decreased, and the content of amorphous carbon increased. An increase in temperature also promoted the dealkylation reaction and coke condensation, resulting in a decrease in pyrolytic activity. VR hydrogenation was subjected to kinetic analysis, and a model for MoTi-5-catalyzed VR deactivation was developed using OCR to deduce the degree of contribution of coke generation to lightning.
研究领域:
石油化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 2
·186
·
IF 4.7
Wenbin Wang,Wei Qiang,Chuntao Chen,Dongping Sun
The utilization of titanium dioxide (TiO2) as a photocatalyst for the treatment of wastewater has attracted significant attention in the environmental field. Herein, we prepared an NH2-MIL-125-derived N-doped TiO2@C Visible Light Catalyst through an in situ calcination method. The nitrogen element in the organic connector was released through calcination, simultaneously doping into the sample, thereby enhancing its spectral response to cover the visible region. The as-prepared N-doped TiO2@C catalyst exhibited a preserved cage structure even after calcination, thereby alleviating the optical shielding effect and further augmenting its photocatalytic performance by increasing the reaction sites between the catalyst and pollutants. The calcination time of the N-doped TiO2@C-450 °C catalyst was optimized to achieve a balance between the TiO2content and nitrogen doping level, ensuring efficient degradation rates for basic fuchsin (99.7%), Rhodamine B (89.9%) and tetracycline hydrochloride (93%) within 90 min. Thus, this study presents a feasible strategy for the efficient degradation of pollutants under visible light.Keywords:titanium dioxide;NH2-MIL-125;N-doped TiO2@C;visible light photocatalysis;wastewater pollutants
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2018
·Vol. 8
·期 5
·182
·
IF 3.465
Feng Li,Jinrong Liang,Wenxi Zhu,Hua Song,Keliang Wang,Cuiqin Li
Ni/TiO2catalysts with different morphologies (granular, sheet, tubular and spherical) were prepared. Hydrogen was generated from ethanol aqueous-phase reforming over Ni/TiO2in a water-ethanol-m-chloronitrobenzene reaction system and directly applied intom-chloronitrobenzene catalytic hydrogenation. Thereby, in-situ liquid-phase hydrogenation ofm-chloronitrobenzene over Ni/TiO2without addition of molecular hydrogen was successful. Compared with granular, sheet and spherical Ni/TiO2, the nanotubular Ni/TiO2prepared from one-step hydrothermal reaction had larger specific surface area, smaller and uniformly-distributed pore sizes and more Lewis acid sites. In-situ liquid-phase hydrogenation ofm-chloronitrobenzene experiments showed the nanotubular Ni/TiO2had the highest catalytic activity, which was ascribed to both catalyst morphology and acid sites. Firstly, the nanotubular structure endowed the catalysts with a nanoscale confinement effect and thereby high catalytic performance. Secondly, the Lewis acid sites not only accelerated water–gas shift reaction, enhancing the ethanol aqueous-phase reforming activity for hydrogen generation, but also promoted the adsorption and hydrogenation of –NO2on the active sites of the catalysts.Keywords:Ni/TiO2;morphology effect;in-situ hydrogenation;aqueous-phase reforming;m-chloronitrobenzene
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yangyang Yu,Yingming Zhu,Jing Guo,Hairong Yue,Hegui Zhang,Changjun Liu,Siyang Tang,Bin Liang
TiO2 pigments are widely used in paint industries. Inert coating layers were usually deposited on the TiO2 pigments to suppress the photocatalytic activity of TiO2, which can prevent the degradation of surrounding polymer molecules. However, the traditional wet chemical methods normally form thick films, which would impair the pigment properties of TiO2. In this work, SnO2 and SiO2 protective layers were grown on the TiO2 particle surface by low-temperature pulsed chemical vapor deposition. At temperatures <60 °C, thin and uniform amorphous SnO2 films were obtained. The photocatalytic activities of both TiO2/SnO2 and TiO2/SiO2 core–shell particles were suppressed, and TiO2/SnO2 core–shell particles showed higher lightening power than TiO2/SiO2. According to transient fluorescence, photocurrent, and electrochemical impedance spectroscopy measurements, the low electron mobility of amorphous SnO2 and SiO2 films led to fast recombination of photogenerated electrons and holes, thus preventing their migration to the surface and suppressing the photocatalytic activity of TiO2.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2017
·Vol. 26
·期 5
·058101
·
IF 1.223
Ming-Ye Sun,You-Jin Zheng,Lei Zhang,Li-Ping Zhao,Bing Zhang
Carbon nanodots (CDs) with visible absorption band and TiO2 are integrated to enhance the photosensitivity of TiO2. The CD/TiO2 nanocomposites show obvious CD-coverage-dependent photocatalytic performance. The CD/TiO2 nanocomposites with moderate CD coverge exhibit the highest photocatalytic activity after being irradiated with visible light, which is more excellent than that of TiO2. Too little CD coverage could result in poor visible light absorption, which limits the photocatalytic performance of CD/TiO2 nanocomposites. While, too much CD coverage weakens the photocatalytic activity of CD/TiO2 nanocomposites by restraining the extraction of conduction band electrons within TiO2 to generate active oxygen radicals and the electron transfer (ET) process from CDs to TiO2. These results indicate that rational regulation of CD coverage and the realization of efficient ET process are important means to optimize the photocatalytic performance of CD/TiO2 nanocomposites.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）