KEY ENGINEERING MATERIALS
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2012
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IF 0
Hai Feng Chen,Ting Yan
Using Bi(NO3)3•5H2O, Na2WO4•2H2O and Ti• (OC4H9)4 as the main raw materials, different alcohol solvent as medium, hexamethylene tetramine as sink set agent, tungsten bismuth and titanium dioxide composite powder were prepared by hydrothermal synthesis. It was characterized by XRD and DRS. The methyl orange imitated sewage, we study the impacts of calcinations’ temperature, catalyst amount, concentration, illumination time and pH on photocatalytic performance of Bi2WO6/TiO2 samples under visible light. The results showed that calcinations’ temperature 400 oC was the best, because the forbidden band gap decreased with temperature increased, but phase transition or decomposition exothermic of the samples would occurre at higher than 400 degree. The Bi2WO6/TiO2 prepared under acidic condition had only 2.41 eV as the smallest forbidden band gap of the samples.
研究领域:
材料科学
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环境科学
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DOI
Nano Research
·
2015
·Vol. 8
·期 12
·4061-4071
·
IF 7.01
Zhao Zhao,Zhang Xiaoyan,Zhang Guoqiang,Liu Zhenyu,Qu Dan,Miao Xiang,Feng Pingyun,Sun Zaicheng
To further understand the effect of structural defects on the electrochemical and photocatalytic properties of TiO 2 , two synthetic approaches based on hydrothermal synthesis and post-synthetic chemical reduction to achieve oxygen defectimplantation were developed herein. These approaches led to the formation of TiO 2 nanorods with uniformly distributed defects in either the bulk or on the surface, or the combination of both, in the formed TiO 2 nanorods (NRs). Both approaches utilize unique TiN nanoparticles as the reaction precursor. Electron microscopy and Brunauer-Emmett-Teller (BET) analyses indicate that all the studied samples exhibit similar morphology and similar specific surface areas. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) data confirm the existence of oxygen defects (VO). The photocatalytic properties of TiO 2 with different types of implanted VO were evaluated based on photocatalytic H 2 production. By optimizing the concentration of VO among the TiO 2 NRs subjected to different treatments, significantly higher photocatalytic activities than that of the stoichiometric TiO 2 NRs was achieved. The incident photon-to-current efficiency (IPCE) data indicate that the enhanced photocatalytic activity arises mainly from defect-assisted charge separation, which implies that photo-generated electrons or holes can be captured by VO and suppress the charge recombination process. The results show that the defective TiO 2 obtained by combining the two approaches exhibits the greatest photocatalytic activity enhancement among all the samples.
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
Small
·
2023
·Vol. 19
·期 27
·2300519
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IF 13.3
Lizhen Long,Yaya Ding,Nina Liang,Jun Liu,Fuchi Liu,Sheng Huang,Yuezhong Meng
Li–CO 2 battery provides a new strategy to simultaneously solve the problems of energy storage and greenhouse effect. However, the severe polarization of CO 2 reduction and CO 2 evolution reaction impede the practical application. Herein, anodic TiO 2 nanotube arrays are first introduced as carbon-free and free-standing cathode for photo-assisted Li–CO 2 battery, and the photo-assisted charge and discharge mechanism is first clarified from the perspective of photocatalysis. Mixed-phase TiO 2 exhibits a long cycling life of 580 h (52 cycles) at 0.025 mA cm −2 and delivers a high discharge specific capacity of 3001 µAh cm −2 under UV illumination. The charge voltage dramatically reduces from 4.53 to 3.03 V under UV illumination. The improvement of photo-assisted Li–CO 2 battery performance relies on the synergistic effect of the hierarchical porous structure, strong UV absorption, efficient separation, and transfer of photo-generated electrons and holes at hetero-phase junction, and the facilitation of photo-generated electrons and holes on CO 2 reduction and CO 2 evolution reaction. This work can provide useful guidance for designing efficient photocathode for photo-assisted Li–CO 2 battery and other metal–air batteries.
研究领域:
材料科学
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能源存储与转换
·
光催化
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xueying Cheng,Renquan Guan,Yunning Chen,Yudan Qian,Qingkun Shang,Yingnan Sun
In this study, the adsorption and photocatalytic degradation of oxytetracycline (OTC) were systematically investigated using different metal-doped anatase-phase mesoporous TiO 2 nanocatalysts (M−TiO 2 , M = Fe, Co, Ni, Cr). The results showed that doping with different metals had a significant effect on the ability of TiO 2 to adsorb and degrade OTC . Comparing the photoelectric properties of four photocatalysts (Fe-TiO 2 , Co-TiO 2 , Ni-TiO 2 and Cr-TiO 2 ), it was observed that the mutual synergy between the separation ability of the photogenerated carriers and the adsorption ability of pollutants was the fundamental reason for the excellent photocatalytic performance of Fe-TiO 2 . The relative intensities of the high-resolution mass spectrometry (HRMS) peaks were used to track and analyse the degradation products of pollutants at different adsorption or light-irradiation times during the photocatalytic process. The ability of the pollutants to undergo dark-state adsorption significantly influenced their degradation paths and products. The possible mechanism of the photocatalytic decomposition of pollutants using Fe-TiO 2 along different paths was proposed according to the Fukui function calculation and MS results. To the best of our knowledge, this is the first time that quantitative HRMS results have been used to assess the degradation pathways of pollutants.
研究领域:
环境科学
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分析化学
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材料科学
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Yanqin Shi,Yiyi Zhao,Meng Ma,Si Chen,Huiwen He,Yulu Zhu,Xu Wang
For preparing high performance LLDPE film, the photocatalytic activity and the UV absorption capacity of TiO 2 were regulated by the alumina coating content on the surface of TiO 2 . Alumina-coated TiO 2 was prepared by the chemical liquid deposition method, and characterized by element analysis, TGA, FTIR, and morphology observation. The alumina coating layer had been proven to covalently bind to the surface of TiO 2 through Al O Ti bonds, which formed a continuous and dense coating layer, followed by forming a loose flocculent coating layer with the increase of alumina content. The alumina coating layer could significantly reduce the formation of carbonyl group on the LLDPE chains, and enhance UV aging resistance of LLDPE by inhibiting the photocatalytic activity of TiO 2 . Moreover, the dispersion of alumina-coated TiO 2 in the LLDPE matrix was improved. Thus, the transmittance of LLDPE/alumina-coated TiO 2 composites was reduced and the whiteness was improved. Importantly, the continuous and dense alumina coating layer was enough to inhibit the photocatalysis effect of TiO 2 on LLDPE. The further increase of alumina coating content reduced the UV absorption capacity of alumina-coated TiO 2 and its compatibility with the LLDPE matrix. Therefore, the best alumina coating content on the surface of TiO 2 was 1.46 wt% for preparing high performance LLDPE/TiO 2 composites. Highlights Alumina-coated TiO 2 with controllable coating thickness was successfully synthesized. LLDPE/alumina-coated TiO 2 has excellent UV aging resistance and mechanical properties. The photocatalytic activity and UV absorption capacity of TiO 2 could be regulated. 1.46 wt% of alumina coating is the best content for high performance LLDPE/TiO 2 composites.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2020
·
IF 4.419
Zhenhai Xu,Jianming Gao,Zonghui Zhou,Yasong Zhao,Xuemei Chen
In order to clarify the enhancing mechanism of nano-TiO 2 (NT) on tricalcium silicate (C 3 S) paste, the hydration and microstructure of C 3 S with and without NT were investigated. Hydration properties were analyzed by setting time, compressive strength , hydration heat, Ca(OH) 2 content and relative content of C-S-H. Moreover, the microstructure of C 3 S paste was studied by pore structure and micromorphology. The results showed that seeding effect of NT promoted the chemical activity as well as hydration of C 3 S and more NT led to higher hydration degree. Besides, NT can increase the content of Ca(OH) 2 and the relative content of C-S-H, which also proved the enhancement effect of NT on C 3 S chemical activity and hydration. Furthermore, the seeding effect and filling effect of NT decreased total porosity, enhanced density and meliorated the microstructure of hardened C 3 S paste. Ultimately, the improved hydration and optimized microstructure introduced by NT enhanced the compressive strength of C 3 S paste.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 13
·9861-9864
·
IF 3.84
Furong Wang,Guoqiang Zhang,Zhao Zhao,Huaqiao Tan,Weixing Yu,Xuming Zhang,Zaicheng Sun
A simple hydrothermal method is developed to directly grow TiO2 nanosheets on a bare glass substrate. By tuning the reaction conditions, the thickness of the TiO2 nanosheet layer can be tuned from tens to hundreds of nanometers. This TiO2 nanosheet layer exhibits good transparency due to the air pocket existing inside the thin film layer between nanosheets. On the other hand, the TiO2 layer has a good hydrophilic surface and good wettability, especially under UV light illumination. The degradation of dye (rhodamine B) results indicate that the TiO2 nanosheet coating has excellent photocatalytic activity. All these results demonstrate that the TiO2 nanosheet coating could be a highly transparent self-cleaning coating.
研究领域:
材料科学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiaojing Yu,Haoran Qiu,Zhe Wang,Bin Wang,Qingnan Meng,Shaodong Sun,Yufei Tang,Kang Zhao
Aiming at comparing the charge separation efficiencies of various heterojunctions, such as p-n junction, metal–semiconductor junction, Z-scheme junction, TiO 2 -Au, TiO 2 -BiOI, TiO 2 -BiOI-Au and TiO 2 -Au-BiOI were synthesized by using n-type TiO 2 , p-type BiOI and plasmon metal Au as components for photocatalytic nitrogen fixation. The as-prepared “Z-scheme” TiO 2 -Au-BiOI photocatalyst showed the highest photocatalytic performance for N 2 photofixation with 543.53 μmol L −1 h −1 g −1 in the pure water system, which is 1.68 times higher than that of TiO 2 -BiOI-Au nanocomposite, 1.85 times higher than that of TiO 2 -BiOI and 6.69 times higher than that of TiO 2 -Au, revealing superiority of the heterojunctions of TiO 2 -Au-BiOI in kinetics among these different heterostructured photocatalysts during the photocatalytic N 2 reduction process. Moreover, the as-prepared TiO 2 -Au-BiOI exhibited considerable performance under real natural environment, showing a promising potential in future application.
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
·
2022
·
IF 9.965
Xun He,Long Hu,Lisi Xie,Zerong Li,Jie Chen,Xiuhong Li,Jun Li,Longcheng Zhang,Xiaodong Fang,Dongdong Zheng,Shengjun Sun,Jing Zhang,Abdulmohsen Ali Alshehri,Yongsong Luo,Qian Liu,Yan Wang,Xuping Sun
Nitrite (NO 2 − ), as a N -containing pollutant, widely exists in aqueous solution, causing a series of environmental and health problems. Electrocatalytic NO 2 − reduction is a promising and sustainable strategy to remove NO 2 − , meanwhile, producing high value-added ammonia (NH 3 ). But the NO 2 − reduction reaction (NO 2 − RR) involves complex 6-electron transfer process that requires high-efficiency electrocatalysts to accomplish NO 2 − -to-NH 3 conversion. Herein, we report NiS 2 nanoparticles decorated TiO 2 nanoribbon array on titanium mesh (NiS 2 @TiO 2 /TM) as a fantastic NO 2 − RR electrocatalyst for ambient NH 3 synthesis. When tested in NO 2 − -containing solution, NiS 2 @TiO 2 /TM achieves a satisfactory NH 3 yield of 591.9 µmol h −1 cm −2 and a high Faradaic efficiency of 92.1 %. Besides, it shows remarkable stability during 12-h electrolysis test.
研究领域:
环境科学
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材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·
IF 2.4
Zhu Liguo,Zhang Zuqing,Kong Lingxin,Wang Chengyuan,Yang Bin,Xu Baoqiang
Ti is produced by the Kroll method, mainly by carbothermic chlorination, magnesiothermic reduction, and vacuum distillation, which result in complex processes, low efficiency, and high cost. Although Ti has many excellent properties, its high production costs limit its widespread applications. There is an urgent need to develop new Ti extraction processes to reduce the cost of Ti production. In this study, we propose a new method for the direct preparation of low-oxygen Ti powder from TiO 2 using Mg as a reducing agent and the formation of CeOCl (2Mg ( l ) + TiO 2 ( s ) + 2CeCl 3 ( l ) = Ti ( s ) + 2CeOCl ( s ) + 2MgCl 2 ( l )). First, a deoxidization experiment of Ti with Mg as a deoxidizer was conducted, and the ability of Mg to deoxidize Ti was demonstrated. At 1273 K, when the activity of CeCl 3 was 1, the oxygen concentrations of Ti-A and Ti-B were 380 and 270 ppm, respectively. Subsequently, the TiO 2 reduction experiment was conducted using Mg as the reducing agent. The results showed that MgO activity was effectively reduced by the formation of CeOCl (MgO( s ) + CeCl 3 ( l ) = MgCl 2 ( l ) + CeOCl( s )). When the system reached the Mg/MgCl 2 /CeOCl/CeCl 3 equilibrium, low-oxygen Ti powder below 1000 ppm was directly produced from TiO 2 .
研究领域:
材料科学
·
冶金工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shumail Farhan,Asif Hassan Raza,Long Li,Songyu Yang,Yan Wu
Comprehending the catalytic reaction implementation for heterostructure photocatalysts is crucial by scrutinizing the spatial separation and transfer process of photoexcited charges at nanoscale junctions. Herein, we fabricated the F-doped TiO 2 /ZnIn 2 S 4 -based S-scheme heterostructure using a direct liquid-assembly method. The optimum hydrogen evolution rate (HER) of ∼ 1.58 mmol g –1 h –1 was acquired for 30-F 3 T@ZIS, which was about 15 and 2 times superior to the pristine F-doped TiO 2 and ZnIn 2 S 4 , respectively. The interaction between F-doped TiO 2 and ZnIn 2 S 4 facilitated the charge transfer from ZIS to F 3 T which was confirmed through XPS. UV–vis spectroscopy and Mott–Schottky validated that F-doped TiO 2 and ZnIn 2 S 4 retain the suitable energy band alignment for the S-scheme heterostructure. In situ, KPFM and EPR analysis revealed that F-doped TiO 2 and ZnIn 2 S 4 possess a spontaneous photoelectrochemical response, and their junction significantly improves the internal electric field by separating photoexcited charge carriers. This work provides a conclusive experimental and theoretical validation for an internal electric field and charge flow direction in non-noble-metal-based heterostructure photocatalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
He Ma,Dashuai Li,Yingying Li,Yuanyuan Li,Changhua Wang,Xintong Zhang
While photocatalytic technology has been recognized as an effective means for removing low-concentration NOx in ambient atmosphere, it still faces the challenge of the deep oxidation in high efficiency. In many cases, the release of more toxic NO 2 byproduct appeared to be inevitable during the photocatalytic oxidation of NO. Herein we report that the atomically dispersed MnO x cocatalyst on TiO 2 (B) microspheres could significantly enhance the deep oxidation of NOx under mild photocatalytic conditions (1 mW/cm 2 UV-A light, 1 L/min flow rate). At an initial NO concentration of 0.35 ppm, ca. 67.15% of NO is oxidized on the MT-0.5 sample, which is 2.76 times higher than the pristine TiO 2 (B) sample. More importantly, the release of NO 2 is suppressed by 2.11 times. Comprehensive spectral analyses suggest that atomically dispersed MnO x effectively promotes the charge separation of photogenerated carriers in TiO 2 (B), even better than MnO x nanoparticles-loaded TiO 2 (B). EPR and in-situ FTIR analyses illustrate that atomically dispersed MnO x -loaded TiO 2 (B) sample exhibits excellent low concentration NOx abatement performance, thus providing a rational mechanism for the NO deep oxidation pathway. This study not only provides a unique approach for preparing non-noble metal atomically dispersed co-catalysts, but also affords an effective means for efficient photocatalytic NO degradation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）