WATER AIR AND SOIL POLLUTION
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2024
·Vol. 236
·期 1
·1-15
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IF 3.8
Li Xiao-fang,Ding Yue,Wang jing,Feng Xiao-qiang
Based on the excellent adsorption, photosensitization and electron transfer ability of biochar, the combination of photocatalyst and biochar is an effective method to improve the overall photocatalytic activity. Hence, a novel efficient CS-biochar/ZnO/TiO 2 photocatalyst with the different content of N-doped porous CS-biochar were constructed and characterized by a variety of testing methods, such as FT-IR, XRD, UV–vis DRS, SEM–EDS, PL, EIS, TPR, LSV. Photocatalytic experiments indicated that all the CS-biochar/ZnO/TiO 2 composites with different CS-biochar content exhibit excellent photocatalytic activity for Rh B degradation. Among them, 63%-CS/ZnO/TiO 2 composite has the best catalytic activity, which 94.5% of Rh B was degraded within 25 min, and the kinetic constant was 0.0993 min −1 , which is about 1.96 and 1.72 times that ZnO (0.0507 min −1 ) and TiO 2 (0.0576 min −1 ), respectively. Moreover, photoelectrochemical experiment results confirmed that CS-biochar/ZnO/TiO 2 greatly enhanced the charge separation process compare with ZnO and TiO 2 . Meanwhile, CS-biochar/ZnO/TiO 2 has excellent stability, and a possible photocatalytic mechanism was put forward.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 39
·5574-5584
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IF 2.6
Manshu Han,Yirong Zhao,Yongfeng Bai,Yu Li,Minghua Chen,Qingguo Chen
Bi-based materials can retain massive amounts of sodium ions through alloying and conversion reactions, resulting in excellent theoretical capacity. However, during the sodiation/desodiation process, there is always a significant volume change in the alloying reaction. In this work, TiO2-coated hexagonal-phase topological insulator (TI) Bi2Te3 composites grown on carbon cloth (CC) were prepared using a solvothermal reaction and an atomic layer deposition process (TiO2/Bi2Te3/CC) as anode materials for sodium-ion batteries without the need for a binder. Compared to the pure Bi2Te3 electrode, the optimized TiO2/Bi2Te3/CC composite exhibits a superior specific capacity of 450 mA h g−1, a high rate performance of 0.1 A g−1, and a high cycling stability of 100 cycles due to the inherent properties of TIs, contributed by the effective TiO2 cladding layer and large interfacial spacing of Bi2Te3. The enhanced reversible capacitance, rate capability, and cycling performances can be attributed to the heterointerfaces and excellent mechanical properties of TiO2, which balance the electronic structure of the building blocks and inhibit the detaching of Bi2Te3 due to large internal stresses. The amorphous TiO2/Bi2Te3/CC composite was treated in a tubular furnace to obtain crystalline TiO2/Bi2Te3/CC, and the electrochemical performance of the heterostructures formed by the TiO2 coating layer with different properties was compared. This work demonstrates the enormous potential for enhancing the sodium-ion storage capabilities of alloy electrode materials by constructing heterostructures.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2018
·
IF 5.503
Zhengfeng Huang,Peimei Dong,Yanzhao Zhang,Xiaoxiao Nie,Xiya Wang,Xiwen Zhang
A strategy of coupling a photocatalyst with a high CO 2 adsorption capacity material was proposed in order to integrate CO 2 capture and photoreduction processes into a single system. TiO 2 and ZIF-8 were selected for their high photoactivity and CO 2 adsorption capacity respectively. We employed a facile in-situ growth strategy to inlay ZIF-8 into the TiO 2 film grid. X-ray diffraction and scanning electron microscopy revealed that ZIF-8 was successfully prepared and inlaid into the TiO 2 film. X-ray photoelectron spectroscopy and photoluminescence spectra suggested that the TiO 2 and ZIF-8 were coupled by chemical bonding. The ZIF-8 decorated TiO 2 film exhibited excellent CO 2 capture capacity and showed remarkably enhanced yield for reducing CO 2 to CO and CH 4 when compared with pure TiO 2 film. The probable mechanism of the photoreduction process is also discussed.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 7
·3262
·
IF 4.6
Shuya Xue,Min Shi,Jinye Wang,Jiapeng Li,Guanwei Peng,Jingkun Xu,Yansha Gao,Xuemin Duan,Limin Lu
In this work, TiO2-MXene/poly (3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) composite was utilized as an electrode material for the sensitive electrochemical detection of baicalein. The in-situ growth of TiO2nanoparticles on the surface of MXene nanosheets can effectively prevent their aggregation, thus presenting a significantly large specific surface area and abundant active sites. However, the partial oxidation of MXene after calcination could reduce its conductivity. To address this issue, herein, PEDOT:PSS films were introduced to disperse the TiO2-MXene materials. The uniform and dense films of PEDOT:PSS not only improved the conductivity and dispersion of TiO2-MXene but also enhanced its stability and electrocatalytic activity. With the advantages of a composite material, TiO2-MXene/PEDOT:PSS as an electrode material demonstrated excellent electrochemical sensing ability for baicalein determination, with a wide linear response ranging from 0.007 to 10.0 μM and a lower limit of detection of 2.33 nM. Furthermore, the prepared sensor displayed good repeatability, reproducibility, stability and selectivity, and presented satisfactory results for the determination of baicalein in human urine sample analysis.Keywords:TiO2-MXene;oxygen vacancy;PEDOT:PSS;baicalein;electrochemical sensor
研究领域:
分析化学
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材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Yuanxia Li,Fangfang Zeng,Guang Yang,Yi Li,Shun Zhang,Qibin Liu
Phosphogypsum (PG) constitutes a form of solid byproduct emanating from the manufacturing process of wet-process phosphoric acid. The fabrication of one metric ton of wet-process phosphoric acid entails the generation of approximately five tons of phosphogypsum, a highly prolific and economically viable waste stream. If we can effectively solve the problem of poor hydrophobicity of phosphogypsum, it is possible to replace cement and other traditional cementitious materials. In this way, we can not only improve the utilization rate of phosphogypsum but also obtain significant economic and environmental benefits. In the present investigation, hydrophobic surface coatings were synthesized and applied onto the surface of α-hemihydrate phosphogypsum (α-HPG) utilizing sol–gel processing and impregnation techniques. After hydroxylating α-HPG with alkaline solution (OH-α-HPG), titanium dioxide nanoparticles (TiO2) hybridized with perfluorodecyltriethoxysilane (PFDTS) were grafted on its surface. The assessment of the hydrophobic properties of the coatings was conducted through water contact angle measurements, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) analyses. The contact angle remained above 124.2° after strong acidic and alkaline immersion and 50 tape adhesion experiments with good chemical stability and durability, and the mechanism of surface hydrophobicity modification was discussed. The experimental outcomes demonstrated a notable increase in the hydroxyl group concentration on the α-HPG surface following hydroxylation, significantly enhancing the attachment rate of PFDTS and TiO2 onto the HPG surface. PFDTS and TiO2 can undergo chemical interaction with hydroxyl groups, facilitating their robust adsorption onto the surface of OH-α-HPG through chemisorption mechanisms. After bonding the OH-α-HPG surface with PFDTS and TiO2 via hydrogen bonding, the otherwise hydrophilic α-HPG surface acquired excellent hydrophobicity (OH-α-HPG-PT, contact angle (CA) = 146.7°). The surface modification of α-HPG through hydroxylation and hydrophobicity enhancement significantly augmented the compatibility and interfacial interplay between α-HPG and PT. This research successfully enhanced the hydrophobic properties of α-HPG, profoundly showcasing its immense potential within the construction industry and the realm of comprehensive solid waste utilization.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Huaichang Wang,Xiaobo Wang,Mengran Yu,Jianing Li,Juming Liu
As a classical photocatalyst, nano-TiO2 has been widely investigated globally. However, achieving its photocatalytic activity within the spectral range of 400 to 740 nm through a facile approach remains a challenge. Herein, carboxylated carbon species sensitized nano-TiO2 was successfully synthesized by a low-temperature (300 °C) carbonization method using ethanol as carbon source and modifier and commercially available nano-TiO2 as titanium source. The obtained sensitized TiO2 nanoparticles exhibited excellent full visible-light-driven photocatalytic degradation performance. The synthesized TiO2 samples were comprehensively analyzed using a range of characterization techniques. The results indicate that the sensitization of carboxylated carbon species endows the nano-TiO2 with full-visible light spectral response properties and facilitates the separation of photogenerated electron–hole pairs, which leads to excellent full visible-light-driven photocatalytic degradation performance. This study presents a novel strategy for broadening the spectral response and facilitating the industrial scale-up of commercially available nano-TiO2.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xidong Wang,Yanrong Liang,Jiawei Liu,Qianxiong Wen,Cong Zhao,Xiaojuan Liang,Zhaopin Chen,Weidong Xiang
Phosphors in glass films (PiFs) is considered ideal conversion materials for laser lighting, but heat dissipation issue is the main challenge limiting its development. Therefore, it is urgent to find more excellent heat dissipation materials. Herein, we proposed to use AlN with high thermal conductivity as the substrate, and innovatively introduced TiO 2 coating to improve the interface reflection ability and solve the possible problems of shedding and cracking. After a series of optimizations, the LSN PiG-TiO 2 -AlN (PTA) color converter obtained a high thermal conductivity of 29W m −1 k −1 and a low surface temperature. At an input power of 5.2W, the luminous efficiency can reach 175 lm/W and the relative initial intensity can still be maintained by 95.3% at 200 °C. Benefiting from the extremely strong heat dissipation capacity of the AlN substrate, the LSN PTA color converter maintains its relative luminous intensity at 95 % of the initial intensity after 24 h of continuous illumination, which is the best value recorded so far. In addition, LSN PTA is combined with CaAlSiN 3 :Eu 2+ phosphor to achieve high-quality white light with a CRI of 82.5. The above results indicate that LSN PiG-TiO 2 -AlN color converters have a promising research prospect in the field of laser lighting.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 9
·5720-5729
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IF 12.732
Shoujie Guan,Qinglu Fan,Zhichuan Shen,Yuling Zhao,Yang Sun,Zhicong Shi
Anatase TiO2 is considered as a promising anode material for sodium-ion batteries, but the inherent semiconductor properties and the sluggish Na+ diffusion kinetics limit its further development. To overcome these inherent drawbacks, heterojunction TiO2@TiOF2 constructed with two-dimensional nanosheets is prepared by the hydrothermal method. When heterojunction TiO2@TiOF2 is used as a sodium ion battery material, a stable cycling performance of up to 10 000 cycles can be achieved at a high current density of 5000 mA g−1, probably due to the heterojunction structure, the exposed (0 0 1) facet of TiO2 and the in situ formed NaF protective layer. Density functional theory (DFT) calculations further reveal that the heterostructure TiO2@TiOF2 nanosheets possess better electrical conductivity and lower formation energies of Na+ ions than those of the separated TiO2 and TiOF2. This work offers a new strategy to design novel heterojunction structures for the electrochemical sodium storage.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Chenchen Xu,Qi Zhang,Yuyu Zhu,Huaiping Liu,Liangyun Yu,Qi Xu
The organic-inorganic eco-friendly semiconductor photocatalysts have the ability to effectively clear away organic pollutants under daylight, so the research on their synthesis with the controllable topography to improve its solar utilization and degradation activity has drawn the attention of many scholars. In this study, the organic-inorganic nanometer flower photocatalyst PDINH/TiO 2 with enhanced photoactivity was synthesized using PDINH (perylene 3,4,9, 10-tetracarbonate diimide) as the self-assembled carrier of nano-anatase TiO 2 . The CO⋯H Hydrogen bond between PDINH and TiO 2 numerators in the In-situ self-assembly PDINH/TiO 2 Nano photocatalyst enables valid chronic electrons delocalization and thereby accelerates the migration and separation photo-generated charges, so that it has significant photocatalytic dynamic character. This experiment discussed the performance of PDINH/TiO 2 photocatalytic degradation of phenol for the first time, and the consequents evidenced that PDINH/TiO 2 nanocomposite behaved a rapid degradation of phenol (6 ppm) in 6 h under the simulated sunlight. The operation briefness and the latent of making use of the sunlight capability urged the PDINH/TiO 2 to be a notable rising star for the photodegradation of the organic pollutants in water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Aerzigu Xukeer,Jin Li
In this study, ZnO/TiO 2 nanosheets were synthesized using a hydrothermal method followed by annealing. The resulting hierarchical ZnO–TiO 2 heterostructures exhibited improved gas-sensing performance compared with pure ZnO. We demonstrated that tuning the ratio of Zn to Ti components in the heterostructure allowed us to adjust the sensor stability , with the best- performing sample having a Zn:Ti ratio of 2:1. A notable reduction was observed in both the sensor response and recovery times, down to 22 and 17 s, respectively, by utilizing nanosheet- structured ZnO/TiO 2 heterojunctions. To gain insight into the interaction between the sensing materials and formaldehyde (HCHO) molecules, we performed first-principles calculations to examine the density of states , charge transfer, and energy of adsorption. Our approach to constructing heterogeneous structures contributes to overcoming the low desorption efficiency and slow response-recovery time of pure ZnO for gas-sensing applications.
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
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-8
·
IF 5.479
Zhang Yu,Xu Mengjiao,Gao Pan,Gao Wenkai,Bian Zhenfeng,Jia Nengqin
A photoelectrochemical (PEC) method was developed for the determination of dopamine. It is making use of a composite prepared from gold nanoparticles and TiO 2 (type P25) and placed on a fluorine-doped tin oxide (FTO) electrode. The composites are used for photoelectrical detection with improved electron transfer efficiency for photoproduction and with improved photoelectrical conversion efficiency. This is due to the excellent electrical conductivity and surface plasmon resonance absorption by gold nanoparticles, and also by the photocatalytic effect of TiO 2 . Dopamine binds easily to the surface of the composites and acts as an electron donor. This electrode gives a strongly enhanced photocurrent which increases linearly in the 0.1 to 100 μM dopamine concentration range and has a 23 nM detection limit (at S/ N = 3). The electrode was operated over 15 cycles of light-on and light-off states every 20 s under visible-light illumination, and the sensor indicates good stability. In addition, it is selective over several possible interferents including uric acid, L-cysteine, glutathione, ascorbic acid and glucose.
A new gold/P25 composite-based photoelectrochemical sensing scheme for dopamine is described. Under visible light irradiation, the photocurrent response is increased with the increasing concentration of dopamine (DA).
研究领域:
分析化学
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 45
·19924-19932
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IF 3.288
Yifan Liu,Zirui Yu,Shanshan Guo,Lulu Yao,Runze Sun,Xiuying Huang,Weirong Zhao
Transition metal (M = Cu, Fe and Ni) modified TiO2 nanosheets were synthesized via a microwave assisted hydrothermal method. The as-fabricated catalysts were characterized using X-ray diffraction (XRD), electron microscopy, X-ray photoelectron spectroscopy (XPS), nitrogen adsorption–desorption, UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence emission (PL), transient photocurrent–time curves and electrochemical impedance spectroscopy (EIS). The results indicated that the loading of transition metals did not influence the crystal structure and morphology of anatase TiO2, while the specific surface area, the absorption in the visible region and the charge transfer were enhanced. In addition, photocatalytic nitrogen fixation over the transition metal modified TiO2 nanosheets was also evaluated. Under the irradiation of simulated sunlight, transition metal modified TiO2 exhibited better photocatalytic performance and stability than pristine TiO2. Among these samples, Cu/TiO2 with the optimal mass content of 1.0% achieved the best NH4+ generation performance and the evolution rate reached 6.78 mmol g−1 h−1 with the relative standard deviation of 2.33%. Furthermore, a plausible mechanism coupled with interfacial charge transfer (IFCT) over Cu modified TiO2 nanosheets was proposed in our present study.
研究领域:
材料科学
·
环境科学
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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）