CATALYSIS LETTERS
·
2025
·Vol. 155
·期 2
·1-17
·
IF 2.4
Gan Wei,Guo Yan,Zhu Dan,Ling Min,Jiang Can,Zhang Shengfu
With the increasing problems caused by water pollution, the use of photocatalytic oxidation to remove pollutants from wastewater is a sustainable strategy. However, it is challenging to develop well-designed photocatalysts with high photo-quantum efficiency and the comprehension of their photocatalytic reaction mechanisms. Herein, a R/A-TiO 2 /Ti 3 C 2 T x (R: rutile; A: anatase) photocatalyst with different ratios of rutile and anatase phases was prepared by a facile hydrothermal method. The results showed that the number of rutile and anatase phases could be readily regulated by adjusting the dosage of titanium isopropoxide (TTIP) and Ti 3 C 2 T x . The prepared R/A-TiO 2 /Ti 3 C 2 T x -0.2 contained a mass fraction of 42% rutile phase and 58% anatase phase, with the interface between the two phases exhibited a tightly bonded structure. Meanwhile, the heterojunction between the heterophase TiO 2 and Ti 3 C 2 T x interfaces improved the photo-quantum efficiency of R/A-TiO 2 /Ti 3 C 2 T x , and the degradation efficiency of Rhodamine B (RhB) by R/A-TiO 2 /Ti 3 C 2 T x -0.2 was 77.82% in 2 h under ultraviolet light illumination. Ultimately, the active species capture experiments verified that the primary active species in the photocatalytic reaction was h + , ·OH, and·O 2 − . This work could shed light on the new approach to the rational design of high-efficiency heterophase TiO 2 -based photocatalysts. Graphical R/A-TiO 2 /Ti 3 C 2 T x photocatalysts with heterojunctions were controllably synthesized by an EDTA-2Na-assisted hydrothermal method.
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
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 7
·2097-2106
·
IF 1.408
Bai Ting,Zhang Xin,Liu Xiling,Chen Tengfei,Fan Wentao
A series of HZSM-5 catalysts were synthesized by different methods. The physicochemical properties of the HZSM-5 catalysts were characterized by XRD, SEM, N2 isothermal adsorption-desorption, NH3-TPD, Py-IR and TGA, respectively. The results indicated that different preparation conditions lead to different morphologies, textures and the distribution of acid sites. The nanosized HZSM-5 catalysts exhibited better catalytic reactivity and coke capacity than the micro-sized HZSM-5 because nanosized HZSM-5 had larger specific surface area, higher pore volume, more exposed channels and more accessible acid sites. The large particles of NZ-3 in a reasonable range and the smooth surface were conducive to product diffusion; therefore, NZ-3 exhibited higher specific propylene yield and stability than the other nanosized catalysts. The moderate density and distribution of acid sites on NZ-3 also favored the formation of propylene.
研究领域:
化学工程
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催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Lichuan Tan,Peng Wang,Ruowei Lu,Siwen Feng,Guangsong Yuan,Cuijuan Wang
Hollow MOFs nanoreactors with controlled shape, size, pore volume , and shell thickness have been considered as emerging materials for a variety of applications. Selecting environmentally friendly and cheap colloidal carbon (CNs) as the template, bimetallic hollow Ce/Zr-UiO-66 nanoreactors were synthesized. The PXRD , TEM , EDS and other characterization analysis proved that hollow structure was formed, accompanied with incorporating of Ce(III) in UiO-66 and the crystal morphology was good. Furthermore, bimetallic hollow Ce/Zr-UiO-66 was studied as a catalyst to catalyze the conversion of furfural (FF) to furfuryl alcohol (FAL) without exogenous hydrogen. The results showed that the hollow structure and bimetallic UiO-66 was beneficial to the catalytic reaction by modulating the ratio of Ce(III) and Zr(IV). Among then, the 1:4 ratio of Ce(III) and Zr(IV) displayed good catalytic activity, the conversion rate of FF was 95% and selectivity of FAL was 94%. This study opens a new avenue for further rational design and construction of well-performing MOFs nanoreactors.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Alfin Kurniawan,Jian Qiang Zhong,Ze Zhen Wang,Chun Hui Zhou
Allyl alcohol, an industrially valuable intermediate in organic synthesis, is conventionally produced through selective hydrogenation of acrolein and hydrolysis of chloropropene. However, these processes currently face challenges due to the unsustainability of fossil feedstocks. A more sustainable production of allyl alcohol from renewable feedstock (i.e., glycerol) has been demonstrated through gas-phase catalytic reaction over metal oxide catalysts with and without external H2. Improved understanding of the reaction mechanism of glycerol to allyl alcohol conversion is an important effort to rationally design more efficient catalysts. In this work, we investigate gas-phase conversion of glycerol to allyl alcohol through consecutive dehydration and hydrogen transfer reactions over Mo–V oxides supported on acid-modified montmorillonite (HMMT). The use of HMMT as a support enables the well dispersion of metal oxide particles with nominal loadings up to 5 wt % on the catalyst surface while the acidic sites facilitate dehydration of glycerol to acrolein with ∼74% selectivity. By modulating the nominal total Mo+V loading, Mo–V/HMMT catalyst with a 10 wt % metal loading afforded allyl alcohol in 22% yield at 320 °C and ambient pressure. X-ray photoelectron spectroscopic analysis of this bifunctional catalyst in the as-prepared and post-catalysis (spent) states showed changes in the surface Mo(VI)═O species and V4+/V5+ redox ratio; the latter was found to decrease due to the involvement of lower valence V4+ species in the hydrogen transfer reaction of acrolein. Meanwhile, the amount of surface Mo(VI)═O species with weak electronic metal–support interaction decreases after the reaction. Catalytic tests using an aqueous acrolein feed solution suggested the role of water as a hydride donor in transfer hydrogenation of this unsaturated aldehyde to allyl alcohol, while the addition of alcohol-containing compounds, such as 2-propanol and 1,2-propanediol leads to lower allyl alcohol selectivity with time on stream. The results presented here could guide the development of improved supported Mo−V oxide catalysts and reaction systems for efficient gas-phase glycerol conversion to allyl alcohol.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Jun Qin,Xiaomei Li,Zezhong Chen,Feng Feng
Commercially available 9-bromophenanthrene (9-BrP) was used as fluorescence probe for determination of trace palladium (Pd). Under the catalysis of Pd 2+ , 9-BrP is converted to phenanthrene, which can emit stronger fluorescence. Consequently, fluorescence of Pd sample is greatly enhanced, and the enhancement is positively correlated with the concentration of Pd 2+ . The catalytic reaction exhibits excellent selectivity and specificity, which enables a simplification on the pre-treatment of real sample. The method has a wide linear range of 0.07–18 μM and a detection limit of 50 nM for Pd 2+ . Detection and recovery experiments of Pd in lake water, Pd-carbon catalyzer and surface soil are also satisfactory, indicating that the method has better feasibility and application potential in routine determination of Pd.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 6
·5170-5176
·
IF 3.277
Bibimaryam Mousavi,Somboon Chaemchuen,Behrooz Moosavi,Zhixiong Luo,Nadia Gholampour,Francis Verpoort
Zeolitic imidazole framework (ZIF)-67 is an efficient heterogeneous catalyst for the cycloaddition of carbon dioxide to epoxides to afford cyclic carbonates. In this work, ZIF-67 was synthesized by a simple and straightforward method at room temperature. The coupling reaction in the presence of ZIF-67 without any co-catalyst or solvent was studied under different conditions. The reaction conversion was more than 99% and the selectivity toward chloropropene carbonate was considerably higher (>99%) than the previously reported ZIF-8. Moreover, the ZIF-67 catalyst could be recycled at least four times without noticeable loss of catalytic activity.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Shuojiang Liu,Ying Chen,Xingliang Cheng,Gongke Li,Yuling Hu
Surface-enhanced Raman scattering (SERS) in conjunction with nanozymes has emerged as a powerful technique for bioanalysis due to their signal conversion and amplification effect. However, clinical applications continue to encounter challenges such as inadequate selectivity. Herein, we proposed a novel approach for the selective SERS detection of L-DOPA in human serum with dual enzyme-mimicking MOF-919(Fe–Cu). This material exhibits both catechol oxidase-like and peroxidase-like activities, enabling it to catalyze catecholic compounds to o -quinones and subsequently oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) molecules into SERS-active ox-TMB. Ultrasonic-assisted synthesis ensures uniform and dense loading of AgNPs within MOF-919(Fe–Cu), thereby enhancing SERS activity. A sensitive and selective method for SERS detection of L-DOPA was developed. The catechol oxidase-like activity of MOF-919(Fe–Cu) provides ideal selectivity and anti-interference to L-DOPA, while the cascade catalytic system transforms weak SERS signals of L-DOPA into amplified SERS signals of ox-TMB. The mechanism of dual enzyme-mimicking activity was further discussed. The detection process was optimized to achieve high sensitivity towards L-DOPA with a linear range 0.5–100 μmol/L and low limit of detection (LOD) of 0.16 μmol/L. Furthermore, it has been applied in serum sample of Parkinson's patients, demonstrating excellent recovery and low relative error compared to HPLC-UV. This approach offers an economical, efficient and accurate strategy for the detection of L-DOPA and provides valuable insights for the integration of selective multifunctional nanozyme and sensitive SERS detection method.
研究领域:
生物化学
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纳米医学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ANALYST
·
2012
·Vol. 137
·期 19
·4516-4523
·
IF 4.23
Xun Yuan,Yi Chen
A new strategy was explored for the visual determination of Cu2+ using copper-catalysed in situ formation of Ag nanoparticles. In this method, only common reagents were used and the pre-synthesis and modification of nanoparticles are avoided. Ag+ can form a milk-white suspension (AgBr) with Br− in an aqueous solution composed of AgNO3, cetyltrimethylammonium bromide, ascorbic acid, bovine serum albumin, and NaNO3. The reaction will be stopped by addition of Cu2+, accompanied by a colour change from milk-white to orange or brilliant yellow. Cu+ (the reduction product of Cu2+) consumes the dissolved O2 and prevents the O2 from oxidizing the newly reduced Ag atoms (by ascorbic acid) back to Ag+, facilitating the further aggregation of Ag atoms to become Ag nanoparticles. The visible colour change was shown to be specific towards Cu2+ over most other metal ions. The limit of detection was 0.75 μM Cu2+ by the naked eye and 0.25 μM by spectrometer. Quantitation of Cu2+ was achieved in a linear range from 0.25 to 2.0 μM. This method was validated by measuring real water and serum samples, giving results agreeing well with the data reported and measured by inductively coupled plasma mass spectrometry. The recovery was 95.6–106% for untreated tap water and 96.0–100% for resin-pre-treated water and serum samples.
研究领域:
分析化学
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纳米科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 4
·e202304217
·
IF 1.9
Jinfa Yu,Zhaoqin Luo,Xiangying Sun
Graphical NCDs-1, which is the first carbon dot by the microwave method using ethylenediamine and L-arginine, can serve as an efficient heterogeneous catalyst for the synthesis of cyclic carbonates from epoxides with CO 2 and Knoevenagel condensation under mild and solvent-free condition. A simple and convenient method for catalytic reactions with amine-terminated carbon dots was developed. Carbon dots (CDs) as new efficient catalysts have been developed for the Knoevenagel condensation reaction and the synthesis of cyclic carbonates under solvent-free conditions. Six kinds of carbon dots with different numbers of amino groups were synthesized. The amine-terminated carbon dot (NCDs-1) was synthesized using arginine and ethylenediamine by a microwave technique, and its catalytic action was studied. NCDs-1 with the highest numbers of amino groups was used as new metal-free and effective heterogeneous catalysts to perform essential Knoevenagel condensation and cycloaddition reactions in solvent-free conditions. 1 H NMR was used to demonstrate the Knoevenagel condensation mechanism, in situ Fourier infrared spectroscopy was used to investigate CO 2 cycloaddition and a catalytic mechanism was postulated. NCDs-1 showed a yield of 96.3±1.5 % for Knoevenagel condensation of benzaldehyde and malononitrile. In addition, NCDs-1/TBAB showed a yield of (97.0±1.0 %) of 4-phenyl-1,3-dioxolan-2-one for styrene oxide at 100 °C and 0.1 MPa in 1.5 h. A simple and convenient method for catalytic reactions with amine-terminated carbon dots was developed.
研究领域:
化学
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材料科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jian Guan,Yuqi Liu,Qiuyi Zhu,Guojun Ma,Jiayu Zhang,Zheyong Fan,Wei Chen,Jiawei Yang,Ning Han,Yunfa Chen
At present, near-ground ozone still acts as an air pollutant, posing threats to human’s health. In this study, Fe-based catalysts with different coordination environments and valance states were synthesized and the coordination environments were verified using EXAFS and XRD Rietveld fitting, while in-situ Raman and in-situ DRIFTs were employed to investigate the oxygen intermediates of ozone catalytic reaction. The following activities order for ozone catalytic reaction was obtained: [FeO 6 ] 3+ ≫ [FeO 4 ] 3+ > [FeO 6 ] 2+ ≈ [FeO 4 ] 2+ proven by DFT calculations, and α-Fe 2 O 3 with [FeO 6 ] 3+ coordination structure has a high efficiency of about 80 % after 2 h at a WHSV of 720000 mL g -1 h −1 and ozone concentration of 1000 ppm. The superior catalytic activity could be attributed to the high crystal splitting energy in the octahedral coordination structure, which could offer electrons easily for the catalytic reaction. This study provides valuable insights for the development of Fe-based ozone catalysts as well as for other transition metal oxides.
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
FUEL
·
2024
·
IF 6.7
Ying Qiu,Huiyu Liu,Rui Shan,Wei Zhao,Junhua Zhang,Jun Zhang,Haoran Yuan
In the present study, the ultra-large specific surface area Zr-decorated hyper-cross-linked polymers (HP) were firstly developed for the catalytic production of furfuryl alcohol (FOL) from furfural (FAL) using isopropanol as both the hydrogen source and solvent. Comprehensive characterizations were performed to uncover the basic physicochemical properties. The as-prepared Zr/HP showed large specific surface area of ∼1000 m 2 /g, good dispersion of Zr species, plentiful acidity and basicity. 2.5Zr/HP presented the highest activity in the FAL-to-FOL transformation, wherein 97.4 % FAL conversion and 92.9 % FOL yield were achieved within 2 h at 160 °C. The recycling experiments revealed that the as-fabricated Zr-decorated hyper-cross-linked polymers presented good recyclability without significant loss of reactivity even after two consecutive cycles, owing to the strong interaction between hyper-cross-linked polymers and grafted Zr species. Kinetical analysis verified that the activation energy for transfer hydrogenation of FAL could be lowered to a certain degree, especially in the case of lower Zr loadings. More gratifyingly, the Zr-decorated hyper-cross-linked polymers were capable of catalyzing other unsaturated compounds with high conversion rates. In addition, the plausible pathway for the FAL-to-FOL transformation over Zr-decorated hyper-cross-linked polymers was proposed.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Wenlin Wang,Xianling Wang,Gang Li,Xiuting Wu,Qian Yu,Yan Wang,Xinjie Zhao,Jia Gao,Jing Wang
The design of heterojunction and active crystal face is an effective way to promote the separation and migration of photogenerated charge in the process of photocatalytic reaction. In this work, the band gap intercalation Bi 3 O 4 Br/Bi 2 O 2 CO 3 /g-C 3 N 5 (BBC) ternary photocatalyst was successfully designed by one step hydrothermal method. It is found that under alkaline conditions, the addition of g-C 3 N 5 to Bi 3 O 4 Br leads to the preferential growth of the (0 0 1) crystal face of the third phase Bi 2 O 2 CO 3 , and the (0 0 1) crystal face is the active crystal face of the photocatalytic reaction. In addition, the constructed double Z-scheme heterojunction has two different electron transport pathways and bidirectional interface electric fields, which reduces the electron-hole pair recombination rate, maintains a strong redox ability, and enables the photogenerated carrier to effectively separate and transfer, thus improving the catalytic activity of the material. Under visible light irradiation, 15 %BBC presented excellent catalytic activity, the degradation rates of ARB ( k = 0.0238 min −1 ), HCl-TC ( k = 0.0183 min −1 ) and RHB ( k = 0.0200 min −1 ) exceeded 90 % within 120 min. This work is not only of great significance for the purification of water pollution, but also provides a new way for further exploration of novel composite photocatalytic systems.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）