CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Xiaoqiang Gao,Fang Zhang,Yi Yu,Yonghui Dou,Li Xu,Guoji Liu
Mo-modified V 2 O 5 /TiO 2 catalysts were prepared by wetness impregnation method and investigated for the selective oxidation of 2-methylnaphthalene to 2-naphthaldehyde. The catalysts were characterized by XRD, BET, XPS, and Raman to investigate the promotional effect of Mo on catalyst structure, surface property, and catalytic performance. The introduction of molybdenum decreases the amount of KVO 3 phase and enhances the dispersion of the vanadium phase. XPS and Raman results indicate that Mo prevents Sn and K to interact with V species and bonds with Ti or V through bridge oxygen. V1Mo1 sample demonstrates a remarkable improvement in conversion and selectivity compared with others.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jing Liu,Yanqing Zhang,Jian Zheng,Weiwei Li,Fanrong Kong,Yating Yang,Na Lin,Jing Cao,Xiaolong Chen,Fang Wang,Wenying Zhou
Polymer nanocomposites combining large dielectric permittivity ( ε′ ) but low loss along with high breakdown strength ( E b ) have garnered significant attention in the fields of electronic devices and power systems. To concurrently accomplish these desirable performances in pristine graphite nanoplates (GNP)/poly(vinylidene fluoride, PVDF) composites, the GNP were initially encased by a layer of anatase-type titanium dioxide (TiO 2 ) shell, and then incorporated into PVDF to investigate the effect of TiO 2 interlayer on the dielectric properties of the nanocomposites, specifically in relation to the thickness of the TiO 2 shell and the nanofiller concentration. The TiO 2 shell acts as a barrier layer prohibiting the electronic percolating, thus significantly reducing the dielectric loss and leakage conductivity of the GNP@TiO 2 /PVDF. Moreover, it not only alleviates the strong dielectric mismatch between GNP and PVDF, which restrains local electric field distortion, but also introduces charge traps, raising the energy barrier height for captured charge detrapping and preventing the growth of electric trees and subsequently promoting the E b . For example, the PVDF with 20 wt% of GNP@TiO 2 exhibited good comprehensive dielectric performances: ε′ of 50.63, loss factor of 0.071 (100 Hz) and E b of 7.89 kV/mm. Additionally, tailoring the TiO 2 ’s thickness can simultaneously modulate the overall dielectric parameters in the GNP@TiO 2 /PVDF. Theoretical fitting of experimental data via Havriliak-Negami equation uncovers the underlying polarization mechanism and the interlayer’s impact on charge migration. This work provides an efficient method for developing and producing polymeric nanodielectrics that simultaneously incorporate increased E b with high ε′ but low loss for potential use in power devices and microelectronic devices.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Huiling Li,Li Tian,Shuning Yang,Chao Li,Ruidan Li,Yujia Song,Yanjia Guo,Xuwen Li
To sensitively monitor trace-level of malathion (MAT) in vegetable samples, an ultrasensitive solid-state electrochemiluminescence (ECL) sensor was proposed based on TiO 2 @CdSe and Ru(bpy) 3 2+ @Ag NPs. In this system, the introduction of Ag NPs enhanced the initial ECL signal of Ru(bpy) 3 2+ - tripropylamine (TPrA). When TiO 2 @CdSe was introduced into the system, the ECL signal was further enhanced, which may be due to the synergistic effect of the two complexes. Based on the fact that the addition of MAT causes ECL strength to decrease, a ECL sensor for the ultrasensitive trace detection of MAT has been successfully established. Under the optimized conditions, a wide liner detection range of MAT concentrations from 4.0 × 10 −14 to 4.0 × 10 −9 mol L −1 and a low detection limit (S/N = 3) of 1.3 × 10 −14 mol L −1 were obtained. The ECL sensor has been applied to the detection of vegetable samples and satisfactory results were obtained.
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Desalination and Water Treatment
·
2024
·
IF 1
Xu Zuo,Shiyang Zou,Junrong Wu,Bingquan Ding,Aijun Jiang
Herein, core–shell Ag@SiO 2 /TiO 2 nanocomposites were synthesized and applied to activate peroxydisulfate (PDS) for wastewater purification. The Ag core and Ag-doped TiO 2 shell were obtained by stober method and calcination method. The dispersion degree and size of Ag in TiO 2 would influence the oxygen vacancy. Ag enhanced the visible absorption of TiO 2 and activated PDS. Improved degradation performance was attributed to enhanced PDS activation by photogenerated e − , which separated h + and thus promoted methyl orange(MO) degradation. Reactive oxidative species were verified under dark and light conditions via quenching experiments and electron paramagnetic resonance tests, demonstrating SO 4 •– , h + , O 2 •– , and 1 O 2 were formed in light,whereasSO 4 •– , •OH, O 2 •– , and 1 O 2 were responsible for MO degradation under dark conditions. The Ag@SiO 2 /TiO 2 /PDS/light system showed selectivity for removal of cationic dyes (e.g., methylene blue and malachite green) through adsorption and photocatalysis, whereas anionic dyes (e.g., MO) were degraded by photocatalysis alone. Besides, we found excess adsorption of micropollutant onto catalyst may be adverse to the activation of PDS. Therefore, the adsorption of oxidant (such as PDS) onto the catalyst surface would be beneficial for catalytic activation and micropollutant degradation, especially onto active sites. This work aims to provide a new avenue for core-shell structure catalyst synthesis in wastewater purification.
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FUEL
·
2025
·
IF 7.5
Sheng-Zhe Zhao,Rui-Dong Shi,Guo-Tao Xiang,Yong-Da Hu,Jin-Ju Chen
The system of photocatalytic fuel cells (PFC) emerges as a significant innovation within the realm of energy conversion technologies, harnessing the potential of organic waste to produce electrical energy. In this study, we propose a novel approach for simultaneous electricity production and pollutant removal using a PFC system, which consists of Bi 2 O 3 /TiO 2 heterojunction nanotubes modified by g-C 3 N 4 as photoanode materials. The g-C 3 N 4 /Bi 2 O 3 /TiO 2 (CBT) heterostructure possesses a large specific surface area, improved visible light absorption, and enhanced photogenerated carrier separation capability. The morphology, composition, crystal structure, and optical properties of the synthesized CTB were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and UV–Vis diffuse reflectance spectroscopy (DRS). Using tetracycline hydrochloride as the target pollutant, the photocatalytic degradation performance of the CBT heterostructure is 3.2 times higher than that of pure TiO 2 nanotubes. Furthermore, the PFC system consisting of CBT as photoanode has a significant improvement in pollutant degradation and current output when compared with the PFC with pure TiO 2 . This study presents a cost-effective approach for organic waste treatment and simultaneous electricity production.
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Microsystems & Nanoengineering
·
2024
·Vol. 10
·期 1
·1-13
·
IF 7.3
Han Donglai,Guo Boyang,Li Yanru,Feng Wei,Liu Keyan,Wu Tianna,Wan Yuchun,Wang Lili,Gao Ming,Liu Yang,Yang Lili,Wei Maobin,Yang Shuo
Facile and efficient photocatalysts using sunlight, as well as fast and sensitive surface-enhanced Raman spectroscopy (SERS) substrates, are urgently needed for practical degradation of tetracycline (TC). To meet these requirements, a new paradigm for PI/TiO 2 /Ag organic‒inorganic ternary flexible microfibers based on semiconducting titanium dioxide (TiO 2 ), the noble metal silver (Ag) and the conjugated polymer polyimide (PI) was developed by engineering a simple method. Under sunlight, the photocatalytic characteristics of the PI/TiO 2 /Ag flexible microfibers containing varying amounts of Ag quantum dots (QDs) were evaluated with photocatalytic degradation of TC in aqueous solution. The results demonstrated that the amount of Ag affected the photocatalytic activity. Among the tested samples, PI/TiO 2 /Ag-0.07 (93.1%) exhibited a higher photocatalytic degradation rate than PI/TiO 2 (25.7%), PI/TiO 2 /Ag-0.05 (77.7%), and PI/TiO 2 /Ag-0.09 (63.3%). This observation and evaluation conducted in the present work strongly indicated a charge transfer mechanism. Moreover, the PI/TiO 2 /Ag-0.07 flexible microfibers exhibited highly sensitive SERS detection, as demonstrated by the observation of the Raman peaks for TC even at an extremely low concentration of 10 –10 moles per liter. The excellent photocatalytic performance and SERS detection capability of the PI/TiO 2 /Ag flexible microfibers arose from the Schottky barrier formed between Ag and TiO 2 and also from the outstanding plasmonic resonance and visible light absorptivity of Ag, along with immobilization by the PI. The successful synthesis of PI/TiO 2 /Ag flexible microfibers holds significant promise for sensitive detection and efficient photocatalytic degradation of antibiotics.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3812
·
IF 4.2
Yongwei Li,Zhihao Fang,Lijuan Feng,Fangfang Liu,Yucui Shi,Jiao Li,Chao Zhao
A series of Zr-TiO2catalysts were prepared using a facile sol-gel method and were used for N-methylmorpholine (NMM) oxidation to N-methylmorpholine-N-oxide (NMMO). The structure features of Zr-TiO2catalysts were studied in detail through a variety of characterization methods, such as XRD, SEM, N2adsorption-desorption isotherms, XPS, EPR, and O2-TPD. As-obtained 5%Zr-TiO2catalysts had superior catalytic performance and stability with a 97.6% NMMO yield at 40 °C, which related to Zr doping, a higher surface area, more oxygen vacancies, and oxygen chemisorption on the catalytic surface. This work provides an efficient preparation strategy of TiO2-based catalysts for selective oxidation reactions by a facile method.
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高影响因子
SOLAR ENERGY
·
2025
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IF 6.6
Zhen Li,Guizhang Guo,Zhou Yu,Zengyue Ma,Yonggang Lei,Libo Yu,Junke Wang
The use of quantum dots (QDs) to sensitize titanium TiO 2 in photoelectrochemical cells (PECs) for solar-driven water splitting represents a highly promising method for converting solar energy into storable chemical energy in the form of hydrogen. The characteristics and interfaces of the QDs play a crucial role in determining the range of light absorption and the efficiency of charge transport and separation upon photoexcitation. Herein, we build CdS x Se 1-x QDs sensitized TiO 2 photoanodes with different amount of Se source by one-step hydrothermal process using thioglycolic acid (TGA) as bifunctional linker. Our results demonstrate that TGA can both anchor QDs to TiO 2 and decompose S for CdS x Se 1-x QDs preparation. The influence of Se source dosage on PEC performance of CdS x Se 1-x /TiO 2 photoanode has been investigated. UV–vis absorption data shows the increase of Se source can enlarge light response range. X-ray photoelectron spectroscopy, transient open-circuit voltage decay and electron lifetime tests indicate proper thickness of SeO 2 which formed on CdS x Se 1-x QDs has the effect to block charges recombination between CdS x Se 1-x /TiO 2 photoanode and electrolyte, improving the electron lifetime of photogenerated electrons. Consequently, the photoelectrochemical cell (PEC) constructed with a CdS x Se 1-x /TiO 2 photoanode, prepared using 0.8 mmol of selenium source, has achieved a photocurrent density of 14.31 mA cm −2 and a photoconversion efficiency of 15.74 %. These results indicate significant potential for the production of green hydrogen.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Zhiwei Zhou,Junyan Chen,Haikuan Yu,Yuantian Zhao,Xing Li,Jiawei Ren
Secondary effluent organic matter (EfOM) significantly contributes to membrane fouling in ultrafiltration (UF) systems, which limits their broader use in municipal wastewater recycle. A modified ceramic ultrafiltration membrane (MCUM) was synthesized via vacuum filtration and thermal treatment and then activated under ultraviolet (UV) irradiation. The results indicated that the MCUM-2.88 exhibited the most excellent removal of EfOM, effectively retained high molecular weight (MW) proteinaceous substances, and converted medium MW humic-like compounds into lower MW derivatives. Through parallel factor analysis in conjunction with the self-organizing map algorithm, it was observed that the MCUM primarily degraded aromatic, high MW fluorescent components, while tryptophan-like substances remained as dominant residues due to their resistance to photodegradation. Additionally, the improved surface roughness and hydrophilicity of the MCUM facilitated fouling mitigation by strengthening interfacial repulsion, which diminished foulant adhesion. The fouling mechanism transitioned from complete and intermediate blocking to predominantly intermediate blocking, accompanied by a reduction in gel layer fouling. Consequently, the reversible fouling resistance of the MCUM was reduced by 76.8 %, and the irreversible resistance by 34.3 %, markedly enhancing antifouling performance. The results underscore the effectiveness of MCUM in advanced municipal wastewater treatment, showcasing enhanced antifouling performance and strong potential for sustainable water reuse applications.
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Industrial Chemistry & Materials
·
2025
·
IF 11.9
Yan-Chao Qu,Guangyue Xu,Chen Chen,Jianhua Guo,Dingjia Liu,Haiwei Jia,Haonan Guo,Shuya Jia,Jiazhen Jia,Ying Zhang,Lifeng Yan
The development of novel low-temperature selective catalytic reduction (SCR) denitrification catalysts is a crucial research direction for reducing pollution and carbon emissions. Although V2O5-MoO3/TiO2 catalysts have been widely used in commercial applications, achieving effective SCR denitrification for low-temperature flue gases remains a significant challenge. In this study, the catalytic efficiency of the catalysts was systematically investigated and optimized by constructing Pearson linear correlation coefficient models between catalytic activity and different pore structures, substrate crystal planes, and active site components and properties, etc. Through comprehensive characterizations and experiments, anatase TiO2 loaded with 3% V2O5 and 10% MoO3 was developed and demonstrated excellent catalytic activity and stability even in high sulfur content and low-temperature environments. The catalyst was deployed in a pilot plant for over two years, consistently achieving a monthly average denitrification efficiency of over 67% and maintaining an outlet NOx concentration below 50 mg/Nm³. This study provides a robust and efficient low-temperature catalyst for SCR denitrification and offers valuable insights for future catalyst optimization.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yuyan Wang,Hongxia Zhang,Wei Gao,Ming Zhong,Bitao Su,Ziqiang Lei
In this work, two series of plasmonic S-type heterojunction photocatalysts containing Bi, TiO 2 , and biochar (Bi/TiO 2 @C) have been developed through a biomass-assisted hydrothermal-calcination strategy, utilizing grapefruit peel as a reducing agent and C resource. The calcination temperature and the mass ratio of biomass were optimized to obtain the optimal nanocomposite, which shows excellent adsorptive and visible-light photocatalytic performance in the removal of diverse antibiotic and dye pollutants, including tetracycline, oxytetracycline, ciprofloxacin, sulfamethoxazole, sulfisoxazole, malachite green, and rhodamine B. The remarkable performance can be attributed to the enhanced absorption of light absorption resulting from the localized surface plasmon resonance effect of the semimetal Bi, and the formation of heterogeneous interface between Bi and TiO 2 , which accelerates the transfer of photogenerated charge. Furthermore, trapping tests and electron spin resonance (ESR) analysis reveal that ∙O 2 - and h + are the primary active species involved in the removal of tetracycline. A plausible charge transfer mechanism has been proposed.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Liangyong He,Bin Yang,Sen Wang,Yuqing Yang,Yingying Wang,Haiyang Hu,Zhengzhi Zheng,Jiashuo Liu,Jiasheng Qian,Jibin Miao,Weiguo Zhang,Yuchao Ke
The increasing demand for improving the performance of optical devices and the development of nanotechnology have driven research on diffusion films. The preparation of diffusion films with well-defined microstructures can achieve uniform diffusion and scattering of light, thereby improving the efficiency and performance of optical devices. In this study, diffusion films with high transmittance and haze were prepared using PMMA@TiO2@SiO2 (P@T@S) composite microspheres, and the PMMA microspheres and nanoparticles were combined through electrostatic attraction. As compared with PMMA microspheres, the P@T@S composite microspheres displayed better heat resistance as well as swelling resistance. Optical performance data showed that the P@T@S diffusion film had the perfect optical performance with a transmittance up to 90.5% and a haze of 88.3%. The excellent light diffusion effect of the P@T@S diffusion film was experimentally demonstrated, with the light through the film not only displaying the largest area but also maintaining a relatively high brightness. Our findings can provide reference and guidance for further development of light diffusion films, which are of potential application in optoelectronic devices.
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