BIORESOURCE TECHNOLOGY
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2024
·
IF 9.7
Ziyu Jia,Jun Hu,Ping Lu,Yunjun Wang
Carbon quantum dots (CQDs) were successfully synthesized from carbohydrate-rich residue of birch obtained following the lignin-first strategy. The optical and physicochemical properties of the CQDs were studied, along with their potential for photocatalytic pollutant degradation. By combining solvothermal and chemical oxidation methods, the product yield of CQDs from carbohydrate-rich residue reached 8.1 wt%. Doping nitrogen enhances the graphitization of CQDs and introduces abundant amino groups to the surface, thereby boosted the quantum yield significantly from 8.9 % to 18.7 %-19.3 %. Nitrogen-doped CQDs exhibited efficient photocatalytic degradation of methylene blue, reaching 37 % within 60 min, with a kinetic degradation rate of 0.00725 min −1 . This study demonstrates that carbohydrate-rich residue obtained from lignin-first strategy are ideal precursors for synthesizing CQD with high mass yield and quantum yield by combining solvothermal treatment and chemical oxidation methods, offering a novel approach for the utilization of whole biomass components following the lignin-first strategy.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guang Yang,Hao Liang,Daiqi Zhou,Yinsheng Xu,Viktor Takats,Yaroslav Shpotyuk,Xiaoyan He,Yanfeng Gao
Effect of micro-crystallization (based on annealing time and temperature) on near-infrared (NIR)-shielding properties of Li 0.09 K 0.23 WO 3 doped glass was investigated. The tungsten bronze doped glass was prepared by a facile melt-quenching technique. Structure and optical properties of the glass and glass-ceramics were characterized by X-ray diffraction analysis (XRD), Raman, and UV–Vis–NIR spectrophotometry, respectively. Increasing the annealing temperature increases in the range from 400 °C to 500 °C, the tungsten-functional unit Li 0.09 K 0.23 WO 3 structure, which is responsible for NIR-shielding, changes the structural state from amorphous state to crystalline state gradually. Thus, the NIR-shielding properties of glass are significantly enhanced. Furthermore, annealing glass samples at 450 °C, during timeframe from 2 h to 8 h, causes crystallization and grain growth of the functional units, thus NIR-shielding property of the glasses is enhancing. It worth to be mentioned, that the increase of annealing temperature and time duration causes excessive grain growth in the glass matrix, which leads to decreasing of the optical transmittance in the visible light wavelength region. We have found, that the glass sample annealing temperature is at 450 °C with treatment time of 6 h yields the best results. In such manner the optical transmittance at λ = 1500 nm wavelength is 16.5 % and the highest transmittance of visible light wavelength region reaches 65 %. We conclude, that the NIR-shielding properties are adjustable and can be tailored by annealing temperature and time duration, which is expected to enhance the design and vary visual aspects of energy-saving windows.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hongyu Lu,Yang Lu,Difan Lin,Jiang Zhu,Yangyang Du,Hua Zou
Luminescent materials usually suffer from thermal quenching at high temperature due to the aggravation of nonradiation relaxations. Herein, a giant enhancement of up conversion (UC) luminescence is observed in negative thermal expansion (NTE) Y 2 W 3 O 12 :Nd phosphor upon increasing the temperature from 310 to 790 K. In addition, the temperature-dependent UC emission is reversible. To penetrate into the mechanisms, the temperature-dependent luminescence intensity and lifetime are investigated for Nd doped negative and positive thermal expansion (PTE) phosphors. Based these investigation, we infer that the underlying mechanism of the giant enhancement for Y 2 W 3 O 12 :Nd phosphor are due to combined effects of phonon assisted absorptions and contraction of NTE crystals. Moreover, the observation of temperature-dependent near-infrared spectra (NIR) can support the mechanism from the other side. The present findings pave the way to overcome thermal quenching of Nd 3+ ions and explore new thermal enhancement materials sensitized by Nd 3+ ions.
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Tungsten
·
2024
·
IF 5.6
Weng Yu-Jing,Ding Zhao-Ying,Li Ying-Chao,Wu Yuan-Feng,Xu Yuan-Yang,Chen Rui,Zhao Xiao-Lei,Wang Hai-Yong,Zhang Da-Lei,Zhang Yu-Long
Tungsten and its oxides are highly versatile catalysts with unique properties that hold great promise for a wide array of applications, including biological pathways and chemical processes. The chemo-catalysis of cellulose to ethanol presents a promising avenue for ethanol synthesis with the potential for enhanced efficiency compared to conventional methods, offering a sustainable and carbon–neutral alternative to existing petrochemical and biological processes. Herein, Ir/WO x catalysts enriched with oxygen vacancies were meticulously prepared and demonstrated remarkable catalytic performance in converting cellulose to ethanol directly in the presence of tungstic acid. The catalyst achieved a high ethanol yield of 66.5% under optimal reaction conditions, approaching the theoretical yield limit of traditional ethanol fermentation. Characterization results revealed the presence of oxygen defects, Bronsted/Lewis acidity, and Ir nanoclusters on the catalyst surface, working synergistically to facilitate the cascade catalysis of cellulose hydrolysis, sugar retro-aldol condensation reaction, and C2 intermediate hydrodeoxygenation to ethanol. In situ Fourier transform infrared spectrometer analysis confirmed the catalyst's ability to enhance the adsorption and activation of ethylene glycol for ethanol production. By manipulating subtle structural features, this study offers a fresh perspective on tungsten group catalyst design and underscores the importance of synergistic effects among catalytic sites for the efficient production of ethanol from cellulose.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Longbo Jiang,Xingzhong Yuan,Guangming Zeng,Jie Liang,Xiaohong Chen,Hanbo Yu,Hou Wang,Zhibin Wu,Jin Zhang,Ting Xiong
Artificial Z-scheme photocatalyst can not only reduce the recombination of photogeneraged electron–holepairs, but also retain prominent redox ability. In this study, direct solid-state dual Z-scheme WO 3 /g-C 3 N 4 /Bi 2 O 3 photocatalyst was successfully synthesized by one step co-calcination stratage using tungstic acid, melamine and bismuth (III) nitrate pentahydrate as the precursors. Surface, morphological, and structural properties of the resulting materials were comprehensive characterized by XRD, XPS, SEM, TEM, UV–vis diffuse reflection spectroscopy, BET surface areas, photoluminescence and ESR analysis. The WO 3 /g-C 3 N 4 /Bi 2 O 3 composite exhibited superior photocatalytic activities for tetracycline degradation than that of pure g-C 3 N 4 , WO 3 , Bi 2 O 3 and their binary composites under visible light irradiation. The enhanced photocatalytic performance of WO 3 /g-C 3 N 4 /Bi 2 O 3 composite can be ascribed to improved visible light absorption, increased surface area and enhanced separation efficiency of photo-generated electron-hole pairs. In addition, the photocatalyst exhibits high stability and reusability. On the basis of the results, a novel direct solid-state dual Z-scheme photocatalytic mechanism was also proposed.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Lianwei Wang,Jianxin Liu,Yawen Wang,Xiaochao Zhang,Donghong Duan,Caimei Fan,Yunfang Wang
A metastable hexagonal WO 3 (h-WO 3 ) was prepared by a hydrothermal reduction method with glycerol and the Ag 3 PO 4 /h-WO 3 composites were synthesized via a precipitation method. Several techniques were employed to characterize the Ag 3 PO 4 /h-WO 3 composites. Compared to the Ag 3 PO 4 /WO 3 photocatalysts, the Ag 3 PO 4 /h-WO 3 photocatalysts exhibited an excellent visible light photocatalytic performance for efficient degradation of methyl orange (MO). The analysis results showed that the favorable photocatalytic performance of the Ag 3 PO 4 /h-WO 3 composites were mainly attributed to the h + and O 2 − generated during the recycles of W 6+ and W 5+ . Furthermore, under the same conditions, the Ag 3 PO 4 /h-WO 3 composites showed better stability than pure Ag 3 PO 4 photocatalyst for degradation of MO, indicating that h-WO 3 played an important role in the process of degradation. Based on the results of trapping experiments and XPS characterization analysis, the photocatalytic mechanism of the Ag 3 PO 4 /h-WO 3 composites were proposed.
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MOLECULES
·
2024
·Vol. 29
·期 13
·3126
·
IF 4.2
Dong Li,Siyu Tian,Qiuhua Qian,Caiyun Gao,Hongfang Shen,Fei Han
Cesium doped WO3(Cs-WO3) photocatalyst with high and stable oxidation activity was successfully synthesized by a one-step hydrothermal method using Cs2CO3as the doped metal ion source and tungstic acid (H2WO4) as the tungsten source. A series of analytical characterization tools and oxygen precipitation activity tests were used to compare the effects of different additions of Cs2CO3on the crystal structure and microscopic morphologies. The UV–visible diffuse reflectance spectra (DRS) of Cs-doped material exhibited a significant red shift in the absorption edge with new shoulders appearing at 440–520 nm. The formation of an oxygen vacancy was confirmed in Cs-WO3by the EPR signal, which can effectively regulate the electronic structure of the catalyst surface and contribute to improving the activity of the oxygen evolution reaction (OER). The photocatalytic OER results showed that the Cs-WO3-0.1 exhibited the optimal oxygen precipitation activity, reaching 58.28 µmol at 6 h, which was greater than six times higher than that of WO3-0 (9.76 μmol). It can be attributed to the synergistic effect of the increase in the conduction band position of Cs-WO3-0.1 (0.11 V) and oxygen vacancies compared to WO3-0, which accelerate the electron conduction rate and slow down the rapid compounding of photogenerated electrons–holes, improving the water-catalytic oxygen precipitation activity of WO3.
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Advanced Energy Materials
·
2024
·
IF 24.4
Qiaowei Lin,Jiaxing Liang,Ruopian Fang,Changlong Sun,Aditya Rawal,Jun Huang,Quan-Hong Yang,Wei Lv,Da-Wei Wang
Electrocatalysts can optimize the sulfur/sulfide reaction kinetics in Li–S batteries to compete with the loss of lithium polysulfides (LiPSs) caused by the shuttling effect. However, the design rationale of electrocatalysts to drive roundtrip sulfur/sulfide conversion is lacking. Here, pairing Lewis acidic and Lewis basic active sites to reach collective adsorption of LiPSs and simultaneous activation of electrophiles and nucleophiles in LiPSs is proposed. This concept is validated by doping polyaniline with protonated metatungstate anions, which enables reduced activation energies for both sulfur reduction reaction and sulfide oxidation reaction and results in significantly improved kinetics. Such electrocatalysts enable a Li–S battery to reach a low capacity-decay rate of 0.029% per cycle for 1000 cycles. This work would offer insights into battery technologies where sulfur electrocatalysis will play pivotal roles.
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LANGMUIR
·
2025
·
IF 3.9
Dexi Yu,Yuhong Lin,Wenhui Zhou,Xiaoyi Wang,Zhenzhen Yu,Yidong Hou,Masakazu Anpo,Jimmy C. Yu,Jinshui Zhang,Xinchen Wang
Photocatalytic oxidation of benzene to phenol using molecular O2 is one of the most promising sustainable approaches for the green synthesis of phenol. Introducing oxygen vacancies (OVs) on semiconductor surfaces by defect engineering is a promising strategy to enhance the efficiency of benzene oxidation to produce phenol due to the unique functions of OVs in facilitating the charge separation and activation of molecular O2. Herein, a vacuum-sealed annealing strategy has been well developed to generate abundant surface OVs on semiconductors, such as WO3. The well-sealed quartz vial creates a well-controlled low-pressure condition for the formation of OVs without the need for external energy for maintaining the vacuum state. Moreover, the gaseous species generated during the thermal annealing process help mitigate stress-induced defects, particularly bulk defects. The vacuum-sealed annealed WO3 with sufficient OVs and reduced bulk defects shows a better photocatalytic performance in the one-step oxidation of benzene to phenol with O2, compared to the WO3 synthesized through thermal annealing in Ar and H2 atmospheres. The present vacuum-sealed annealing strategy is found to be further applicable to engineer a wide range of semiconducting photocatalysts with abundant OVs to optimize their properties for efficient photocatalysis and other OV-promoted systems.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhaozhu Qu,Hongyu Duan,Xiaofei Zhang,Xiaohui Sun,Yuan Chen,Peitao Xu,Xiang Zhang,Bo Wang,Nana Liu,Guohua Wu,Xiangwei Wang,Xuyang Zhang
Tungsten oxide (WO 3 )-based electrochromic materials have demonstrated significant potential for utilization in green energy applications, particularly in smart windows for buildings and thermal management in electric vehicles. However, the scalable production of environmentally friendly, low-cost WO 3 films with competitive electrochromic properties remains challenging. In this study, a facile and scalable sol-gel method was developed for the fabrication of Ti-doped WO 3 films with a crystal-amorphous composite structure, using nanocellulose as a bio-template. The introduction of a green renewable nanocellulose template resulted in the concurrent formation of a slit-shaped mesoporous morphology and oxygen vacancies. This process served to enhance the specific surface area and charge carrier concentration. It is noteworthy that the nanocellulose also modulated the film crystallization behavior under identical annealing conditions, generating optimized diffusion channels and abundant active sites. The resulting porous WO 3 films exhibited superior electrochromic performance, which provides viable approaches for pore-engineering strategies and crystallinity control in sol-gel derived porous WO 3 films. This offers practical references for processing methodology and structural design considerations.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Chenru Tian,Ganggang Zhang,Jun Liu,Liqun Zhang
The conventional curing methods pose a significant environmental threat due to the use of toxic vulcanizing agents, the release of irritating volatile organic compounds, and the difficulties in recycling end-of-life rubber products. This work demonstrates a catalyst-free, facile, and eco-friendly crosslinking strategy based on the reaction between epoxy-functionalized ethylene-propylene-diene monomer (EEPDM) and dicarboxylic acids. The EEPDM was synthesized via a reusable reaction-controlled phase-transfer catalyst. Then, EEPDM could be effectively crosslinked by dicarboxylic acids without additional additives. The increased acidity of dicarboxylic acids could be conducive to improving the crosslinking rate. Moreover, the curing mechanism and the nature of the crosslinks were investigated, which is crucial for the recyclability of rubbers. The dicarboxylic acid-cured EEPDM exhibited undesirable side reactions, the extent of which showed a positive correlation with the acidity of carboxylic groups. This phenomenon could be primarily attributed to acid-catalyzed self-polymerization via epoxide ring-opening mechanisms, which would be detrimental to the reprocessability. Due to the formation of thermally stable ether linkages, the crosslinked EEPDM exhibited enhanced thermal-oxidative aging behavior. Hence, we envision that this catalyst-free, high-efficiency crosslinking strategy may offer a promising bridge between sustainable modification and high-performance for epoxy-functionalized rubbers, holding potential application in eco-friendly, low-odor automotive sealing strips.
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Nano Materials Science
·
2025
·
IF 17.9
Yang He,Qingling Ruan,Han Kang,Ling Ye,Ya-Xiong Wang,Tiefeng Liu,Hairong Cheng,Xingxing Gu
Li-S batteries (LSBs), with their exceptional theoretical energy density, are widely recognized as a leading option for future energy storage solutions. Nevertheless, on the way to commercialization, the poor conductivity of the positive electrode, the easy dissolution loss of the active substance, and the serious dendrite growth of the negative electrode are stumbling blocks. Therefore, this work designs a novel tungsten and nitrogen-co-doped nanoporous carbon (W,N-C) with multifunction: chemically adsorbs the polysulfides to inhibit shuttling behavior, accelerates Li + transfer, and catalyzes polysulfides redox to address the aforementioned issues of LSBs. As expected at the beginning of the design, the prepared W,N-C-5/S composites cathodes demonstrate excellent performances, i.e., delivering an initial capacity of 944.9 mAh g −1 and a reversible capacity of 771.7 mAh g −1 after 500 cycles at 1 C, significantly outperforming the N-C/S contrast sample. The proposed method offers a feasible solution for boosting the electrochemical performance of LSBs.
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