SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Mikhailov Mikhail,Iurina Victoria,Neshchimenko Vitaly,Li Chundong
The effects of proton (E = 100 keV, F = 5 × 10 15 сm −2 ) exposure on the reflective spectra of Al 2 O 3 , CeO 2 , TiO 2 , Y 2 O 3 , ZrO 2 , ZnO micro- and nanopowders in wavelength range from 250 to 2500 nm have been investigated. It has been established that titanium dioxide nanopowders have higher radiation stability to protons exposure in comparison with the other white powders (TiO 2 , Y 2 O 3 , Al 2 O 3 , ZnO, ZrO 2 ) used as pigments for coatings. This effect is caused by high specific surface area of the nanoparticle causing fast recombination processes of electrons and holes in various surface drains.
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FUEL
·
2022
·
IF 8.035
Hui Li,Tianyu Wang,Yangyang Wang,Fengsheng Liu,Yan Li,Yunpu Wang,Min Guo,Guoning Li,Xiaoling Ma
Sulfated metal oxides are widely used in catalyzing esterification for biodiesel production due to their low corrosivity and easy separation. While, the catalytic stability is still a challenge on account of active site leaching during successive batch experiments. To this end, the typical metal organic frameworks, MIL-100(Fe) doped with Co was adopted to load ammonium sulfate ((NH 4 ) 2 SO 4 ) for stable heterogeneous acid preparation, which was employed to catalyze the esterification of methanol and oleic acid. Influence of preparation factors of (NH 4 ) 2 SO 4 loading amount and activation temperature on catalytic activity were initially evaluated. Furthermore, to elucidate the effect of Co doping, catalysts were characterized by TG, XRD, FTIR, nitrogen adsorption–desorption, Py-FTIR, XPS, SEM and NH 3 -TPD. Results indicated that the maximum esterification conversion of 92.56 % was achieved by MS(Fe/Co) with molar ratio of methanol to oleic acid of 8:1 and catalyst amount of 8 wt% at 70 °C in 2 h. In comparison to MS(Fe), Co doping significantly improved the stability, where the catalytic activity of MS(Fe/Co) was increased by 20 % at the fifth cycle. The activation energy and pre-exponential factor of esterification catalyzed by MS(Fe/Co) were also calculated as 42.06 kJ/mol and 5.24 × 10 5 min −1 . This study provides a feasible way to enhance the catalytic stability of heterogeneous acid for biodiesel production.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Munir Ahmad,Shuo Chen,Fei Ye,Xie Quan,Shahzad Afzal,Hongtao Yu,Xueyang Zhao
Metal-organic frameworks (MOFs) have received significant interest as a promising photocatalyst for environmental remediation due to its high surface area and porous nature. The small pores (<2 nm) in microporous MOFs help the adsorption of small molecules but limits diffusion and accessing of bigger molecules from MOF cavities, thus preventing their applications in some situation. The aim of this work is to fabricate mesoporous MOF composite with larger pore sizes (>2 nm) and open pore cavities that can provide right pathways for ingoing and outgoing of molecules during catalysis. Herein, we successfully report stable mesoporous MIL-100(Fe) loaded with ZnO NS by an in situ self-assembly method. The prepared samples were characterized by Brunauer–Emmett–Teller (BET) and N 2 adsorption-desorption isotherm to study their surface area and porosity. The catalytic performance of mesoporous MIL-100(Fe) was approximately 2–3 order of magnitude more than that of microporous MIL-100(Fe). Such higher catalytic activity in mesoporous MIL-100(Fe) can be ascribed to its mesocellular structure which can improve the molecular diffusion and accessibility inside MOF channels. The charge separation efficiency and photo-Fenton activity of mesoporous MIL-100(Fe) can further be increased by introduction of certain amount of ZnO NS and H 2 O 2 . Moreover, the as synthesized sample shows higher photo-Fenton degradation efficiency at lower pH value with certain amount of H 2 O 2 . Lastly, the possible catalytic mechanism has been tentatively proposed. This study not only used for the pollutants degradation but also provide useful platform for the application of mesoporous MOFs as an efficient photo-Fenton activity to various other fields.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 24
·9725-9731
·
IF 3.069
Suresh Mutyala,Sobhy M. Yakout,Shebl S. Ibrahim,Madhavi Jonnalagadda,Harisekhar Mitta
Iron metal–organic framework, MIL-100(Fe) was prepared by a hydrothermal method and used as a support to incorporate diethylenetriamine (DETA) for the study of CO2 adsorption and separation of CO2/N2. All synthesized adsorbents were characterized by PXRD, N2 adsorption–desorption isotherms, FT-IR, TGA, SEM, and elemental analysis. Structural characterization results have revealed that the structure of MIL-100(Fe) was not changed by the incorporation of diethylenetriamine. The CO2 adsorption capacities were 29 cm3 g−1 and 41 cm3 g−1 at 298 K, 1 bar for MIL-100(Fe) and DETA–MIL-100(Fe), respectively. Adsorption of CO2 on DETA–MIL-100(Fe) was higher than that on MIL-100(Fe). The enhancement was due to the presence of amine groups which could form ammonium carbamate by interaction with CO2. Similarly, the N2 adsorption capacities were 3 cm3 g−1 and 0.9 cm3 g−1 at 298 K, 1 bar for MIL-100(Fe) and DETA–MIL-100(Fe), respectively. The decrease in N2 adsorption capacity was due to the decrease in surface area. The selectivity of CO2/N2 on DETA–MIL-100(Fe) was four times higher than that on MIL-100(Fe). The heat of CO2 adsorption was 74.2 kJ mol−1 at low coverage of CO2 on DETA–MIL-100(Fe) and the CO2 adsorption capacity was constant in each adsorption cycle over the same adsorbent.
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Advanced Optical Materials
·
2015
·Vol. 3
·期 6
·801-812
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IF 4.062
Qian Li,Xiaolu Zhuo,Shuang Li,Qifeng Ruan,Qing-Hua Xu,Jianfang Wang
Gold nanobipyramids (NBPs) and nanorods (NRs) are two common types of elongated colloidal plasmonic metal nanocrystals, with their longitudinal plasmon wavelengths synthetically tunable over a wide spectral range. Au NBPs have sharper tips and narrower shape and size distributions than Au NRs. However, the number percentages of Au NBPs have been limited below ≈60%. Herein, a method for producing Au NBPs with number percentages approaching 100% and longitudinal plasmon resonance wavelengths synthetically tuned from ≈700 to ≈1200 nm is reported. This method relies on a stepwise combination of seed-mediated growth, Ag overgrowth, depletion force-induced self-separation, and final chemical etching of Ag. The obtained Au NBPs have the same shapes and sizes as the directly grown ones. Systematic comparisons of the plasmonic properties between the purified Au NBP and high-yield single-crystalline Au NR samples show unambiguously that Au NBPs are superior to Au NRs in terms of the plasmon peak width, refractive index sensitivity, figure of merit, two-photon photoluminescence, and surface-enhanced Raman scattering.
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DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 41
·18227-18236
·
IF 4.197
Ruowen Liang,Rui Chen,Fenfen Jing,Na Qin,Ling Wu
H3PMo12O40 molecules have been successfully encapsulated in the cavities of MIL-100(Fe) via a facile hydrothermal method (denoted as HPMo@MIL-100(Fe)). A series of characterization has corroborated the insertion of H3PMo12O40 within the cavities of MIL-100(Fe). The resulting HPMo@MIL-100(Fe) nanocomposites have exhibited much higher photoactivity than the original-MIL-100(Fe) toward the photocatalytic selective oxidation of benzylic alcohols and the reduction of Cr(VI) under visible light irradiation (λ ≥ 420 nm). The higher photoactivity of HPMo@MIL-100(Fe) can be attributed to the integrative effect of enhanced light absorption intensity and more efficient separation of photogenerated electron–hole pairs. The host porous structure of MIL-100(Fe) can achieve a uniform composition with H3PMo12O40, which is significantly important for producing highly reactive dispersed H3PMo12O40 molecules and enhancing the photocatalytic activity of HPMo@MIL-100(Fe) nanocomposites. And the immobilized H3PMo12O40 molecules are more convenient for recycling. Importantly, almost no Fe and Mo ions leach from the MIL-100(Fe) during the reaction, which verifies the photostability of the HPMo@MIL-100(Fe). In addition, possible photocatalytic redox reaction mechanisms have been investigated.
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Laser & Photonics Reviews
·
2024
·
IF 9.8
Xiaoxi Li,Mengling Xia,Weiwei Li,Ping Lu,Xianghua Zhang,Yinsheng Xu
Lead-free halide perovskites (LHP) have attracted extensive attention in the field of next-generation solid-state lighting. However, single perovskite phosphor with tunable white-light emission and ultra-high photoluminescence quantum yield (PLQY) are rare. Here, the tunable dual-color emission LHP phosphor is developed with a near-unity PLQY of 99.5%. The LHP phosphor comprises Cs 2 NaInCl 6 : Sb 3+ /Bi 3+ and Cs 2 InCl 5 ·H 2 O: Sb 3+ /Bi 3+ crystals, with the transition between these two perovskite structures being adjustable by the concentration of Na + . The addition of NaCl inhibits the hydrolysis of the [Sb(H 2 O)Cl 5 ] 2− octahedron, resulting in 3D connected [SbCl 6 ] 3− octahedron with less Jahn-Teller distortion, and the PLQY of LHP is greater than 90%. Finally, the white-light diode device is fabricated by assembling the LHP with a ultraviolet light-emitting diode chip and the white light-emitting diode device achieved Commission Internationale de l'Eclairage color coordinates of (0.34, 0.33), correlated color temperature of 4936 K, and a high color rendering index of 92.9. The LHP perovskite exhibited multimodal luminescence when excited by 365, 335, and 310 nm UV light, showing the multi-mode anti-counterfeiting capabilities of the LHP crystals.
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Advanced Energy Materials
·
2024
·
IF 24.4
Yu Chen,Jiajun He,Chengwei Ye,Shaochun Tang
Evaporative hydrovoltaic generators hold significant potential for alleviating water-energy crisis, but low output voltage configurations due to the slow phase transition rate of water molecules and the intricate nature of integration limit their applications. Herein, a lotus-inspired interfacial evaporation-driven hydrovoltaic generators (IEHVG) is developed for efficient generation of water vapor and electricity from seawater instead of freshwater and achieves an ultrahigh voltage output higher than 100-volt level through forested IEHVG integration. The biomimetic hydrogel is developed with specific liquid transport channels, graphene quantum dots/MXene nanocomposites, and gradient hydrophobic interface for highly enhanced photothermal evaporation and electricity generation by mimicking the transpiration process of a “stems-leaves of lotus”. The synergistic thermodiffusion effect leads to the output power density of IEHVG reaches up to 45.6 µW cm −2 and can power electronic devices or charge commercial supercapacitors. The freshwater-electricity cogeneration integrated system consisting of 192 IEHVG units can harvest a record-breaking voltage reaching 105 V and a high freshwater harvesting rate up to 2.0 L m −2 h −1 from seawater in a well-lit outdoor area. This work demonstrates that IEHVG offers a novel concept for modular freshwater and high-voltage power sources access on offshore work platforms.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tao Zhang,Sujie Shan,Dongqing Liu,Yu Han,Kai Sun,Wei Wang
Under the double pressure of eutrophication and phosphorus deficiency, there is an urgent need to remove excess phosphate from wastewater efficiently. Preparing cerium-based materials with excellent application potential inevitably leads to Ce(III) oxidation to Ce(IV), which reduces the phosphate adsorption effect and restricts its development. To solve this problem, we introduced a protective agent and successfully synthesised cerium-modified activated carbon sorbent containing 100 % Ce(III) during the synthesis process. Compared with CeAC without a protecting agent, CeAC-A contained more Ce(III) (100 %) and exchange groups (–OH accounted for 82.76 %), achieving an adsorption capacity of up to 448.57 mg-P/g Ce, improving of 4.3 times. At the same time, the size of the cerium active component was reduced from the micron level to the nanometer level, and the mass transfer rate was significantly improved. In addition, with the enormous specific surface area and well-developed pore structure of activated carbon, it showed high dispersibility, with P/Ce molar ratio as high as 2.03, which is 1.1–4.8 times higher than other cerium-based adsorbents. Phosphate was removed primarily through electrostatic attraction and ligand exchange. In treating municipal wastewater with complex water quality, CeAC-A showed strong selectivity, a wide range of adaptability and easy repeat regeneration, making it a promising adsorbent for phosphate uptake from wastewater.
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ENERGY & FUELS
·
2025
·
IF 5.3
Zhuo Chen,Ze Zhang,Rongxin Xia,Junhu Zhou,Jun Cheng
To improve the conversion rate of carbon dioxide (CO2) to methane (CH4) in a microbial electrochemical system (MES), the zeolitic imidazolate framework ZIF-67(Co) with electron storage properties was first grown in situ on MIL-100(Fe) with excellent CO2 adsorption properties by a hydrothermal method. The obtained binary core–shell MIL@ZIF material was then adsorbed by carbon felt on a cathode to grow biofilms composed of electroactive microorganisms for characterization and testing in an MES. This system exhibited a CH4 production rate of 0.42 mmol LR–1 d–1, along with an impressive faradaic efficiency of 96.4%. Three-dimensional excitation–emission matrix spectra of extracellular polymeric substances indicated that those containing higher contents of humic acid shifted electron pairs and converted redox states to facilitate electron transfer. MIL@ZIF enriched hydrogenotrophic methanogens and electrogenic bacteria in microbial communities with enhanced gene expression of electrically conductive pili and cytochrome C to strengthen interspecies electron transfer. MIL@ZIF enhanced CO2 adsorption and electron storage, reinforcing electron transfer chains and boosting CH4 yield by a factor of 10.7.
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DALTON TRANSACTIONS
·
2025
·Vol. 54
·期 8
·3467-3477
·
IF 3.3
Wenhui Hu,Zhongxin Song,Lingna Sun,Lei Zhang,Qianling Zhang,Xiangzhong Ren,Yongliang Li
Efficient separation of photogenerated charge carriers is essential for maximizing the photocatalytic efficiency of semiconductor materials in oxygen evolution reactions (OER). This study presents a novel trimetallic photocatalyst, MIL-100(Fe)/TiO2/CoOx, synthesized through a facile microwave-assisted hydrothermal method followed by atomic layer deposition (ALD). The porous MIL-100(Fe) serves as a support for the sequential deposition of TiO2 and CoOx layers via ALD, which enhances electron–hole pair separation and minimizes their recombination. Characterization using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) confirms the uniform deposition of TiO2 and CoOx layers on the MIL-100(Fe) surface. The optimized photocatalyst, processed with 20 deposition cycles of Co, exhibits exceptional photocatalytic OER performance, with an oxygen evolution rate of 558.3 μmol g−1 h−1. This enhancement in activity is attributed to the synergistic interaction between the spatially separated TiO2 and CoOx cocatalysts, which facilitates efficient charge transfer and increases the number of active sites. These findings highlight the potential of ALD-fabricated heterostructures in the development of advanced photocatalysts for sustainable energy production.
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Advanced Optical Materials
·
2024
·
IF 8
Liling Fei,Lin Yang,Peng Li,Jiangang Ma
Mn 2+ doped CsPbCl 3 nanocrystals (Mn 2+ :CsPbCl 3 NCs) show immense promise in lighting and display technologies owing to their outstanding optical characteristics. Nonetheless, high defect density, inefficient Mn 2+ doping, and poor structural robustness pose considerable challenges in the synthesis of Mn 2+ :CsPbCl 3 NCs with high photoluminescence quantum yield (PLQY) and long-term stability. This study introduces an eco-friendly room-temperature post-treatment method utilizing MgCl 2 /oleylamine solution, boosting the total PLQY of the NCs from 65% to 98%, including a 30% increase for Mn 2+ emission. Additionally, the post-treatment significantly improves the NCs’ resilience against UV light, retaining 80% of their initial PL intensity after 120 hours of UV exposure. Comprehensive analyses including density functional theory simulation and temperature-dependent PL spectra suggested that the PLQY enhancement is due to the improved Mn 2+ doping efficiency and the effective passivation of native vacancy defects. The stability of the NCs is enhanced by replacing Pb 2+ with Mg 2+ and Mn 2+ , mitigating lattice distortions within the [PbCl 6 ] 4− octahedral framework. The color rendering index of white light-emitting diodes fabricated with the post-treated Mn 2+ :CsPbCl 3 NCs achieves an exceptional value of 98. This work offers novel insights into the fabrication of high-PLQY Mn 2+ :CsPbCl 3 NCs, advancing the practical deployment of perovskite nanomaterials in various industries.
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