ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Xiaomin Zhang,Wenjie Xiong,Zhuoheng Tu,Lingling Peng,Youting Wu,Xingbang Hu
Selective separation of CO2 from flue gas conforms to the criterion of sustainable society. Herein, a series of imidazolium-based phenolate ionic liquids (ILs) that have dual-site interaction centers to isolate CO2 from N2 by supported ionic liquid membranes (SILMs) is designed and prepared. Density, viscosity, and CO2 solubility in these ILs were measured. The effects of the electron-withdrawing or electron-donating ability of the substituents on the anion, the operation temperature and partial pressure on the permeability of CO2, and the ideal selectivity of CO2/N2 were investigated systematically. High permeability (up to 2540 barrers) and selectivity of CO2/N2 (up to 127) are achieved in 1-butyl-3-methylimidazolium phenolate ([bmim][PhO]) containing 15 wt % H2O under humidified condition. A novel facilitated transport mechanism, transfer of CO2 from carbene to phenolated anion, is proposed based on NMR, FT-IR, and theoretical calculation results. The new pathway is believed to offer an alternative opportunity for designing novel CO2 separation materials.
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2015
·Vol. 145
·期 10
·1830-1836
·
IF 2.307
Zhou Yan,Huang Wei,Chen Xiang-Shu,Song Zhi-Bin,Tao Duan-Jian
Abstract Several tetramethylguanidinum-based ionic liquids (TMGILs) were prepared, characterized and used as catalysts in one-pot synthesis of flavanones. The results indicated that TMGILs composed of phenolate anion was beneficial for one-pot synthesis of flavanones, and [TMG][4-MeO–PhO] induced the good yields of flavanones owing to the electron-donating effect of methoxy substituent on phenolate anion. Furthermore, [TMG][4-MeO–PhO] was found to be used repetitively at least five times without obvious decrease in activity and quantity. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Kexin Li,Zhenxing Zeng,Liushui Yan,Mingxin Huo,Yihang Guo,Shenglian Luo,Xubiao Luo
A series of nonmetallic elements co-doped titanium dioxide coated carbon nitride nanotubes (C/X-TiO 2 @C 3 N 4 NTs, X = N, F, Cl) was successfully prepared by a simple sol-gel-pyrolysis process using phenolic organic pollutants, titanium butoxide, and carbon nitride nanotubes as precursors. The morphology, porosity, phase and chemical structure, and optical and electronic property of as-prepared C/X-TiO 2 @C 3 N 4 NTs were well characterized. The as-prepared C/X-TiO 2 @C 3 N 4 NTs exhibited excellent visible-light photocatalytic activity in the conventional degradation and hydrogen evolution systems compared with traditional TiO 2 /g-C 3 N 4 heterojunction, which is attributed to their unique tubular nanostructure and nonmetallic elements co-doped TiO 2 component. Subsequently, the visible-light photocatalytic activity of C/X-TiO 2 @C 3 N 4 NTs was further studied in the simultaneous hydrogen evolution with organic pollutant degradation system on the basis of our previous work. The reaction mechanisms in different photocatalytic systems were further discussed in detail.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Yue Zhang,Zhiyong Li,Huiyong Wang,Xiaopeng Xuan,Jianji Wang
Phenolic compounds are an important class of compounds for organic chemical industry. In their traditional production processes, strong acid and base have to be used for the separation of phenolic compounds from oils, which often causes serious environmental problems. In this work, choline derivative salts [N 1,1, n C 2 OH]Cl ( n = 1, 4, 6, 8) have been used as new extractants for the separation of 26 kinds of phenolic compounds from model oil (toluene) by forming deep eutectic solvents (DESs). It is found that only 16 kinds of phenolic compounds can be removed from toluene with single-step removal efficiency from 28.1% to 94.7%, strongly depending on the chemical structure of phenolic compounds. The nature, position and number of substituent groups in the phenolic compounds have a great effect on their removal efficiency. Far infrared spectroscopy and density functional theory calculations indicate that hydrogen bonds formed between –OH of the phenolic compounds and anion of the choline derivative salts is the main driving force for such DES-based separation. The correlation observed experimentally between structure of phenolic compounds and their removal efficiencies has been discussed from hydrogen bonding in DESs, electrostatic interaction of cation and anion of the choline salts, and solvation of the phenolic compounds and choline salts in the oil.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2017
·
IF 2.813
Zhenxing Zeng,Kexin Li,Kai Wei,Yuhua Dai,Liushui Yan,Huiqin Guo,Xubiao Luo
A series of highly dispersed platinum-deposited porous g-C 3 N 4 (Pt/pg-C 3 N 4 ) were successfully fabricated by a simple in situ photoreduction strategy using chloroplatinic acid and porous g-C 3 N 4 as precursors. Porous g-C 3 N 4 was fabricated by a pretreatment strategy using melamine as a raw material. The morphology, porosity, phase, chemical structure, and optical and electronic properties of as-prepared Pt/pg-C 3 N 4 were characterized. The photocatalytic activity of as-prepared Pt/pg-C 3 N 4 was preliminarily evaluated by the degradation of aqueous azo dyes methyl orange under visible light irradiation. The as-prepared Pt/pg-C 3 N 4 were further applied to the degradation and mineralization of aqueous 4-fluorophenol. The recyclability of Pt/pg-C 3 N 4 was evaluated under four consecutive photocatalytic runs.
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Lin-Feng Zhai,Shu-Ya Xu,Jun Yu,Zhao-Jian Hu,Min Sun,Yan Wang
Nonradical oxidation is a promising pathway for the selective removal of organic pollutants in complex wastewaters. However, traditional catalytic oxidation processes generally depend on free radicals to achieve favorable pollutant removal. Herein, we developed a nonradical pathway-governed catalytic oxidation process by applying an electric field to selectively activate a surface O2-complex on a MnO catalyst. On the surface of positively polarized MnO, adsorbed O2 was activated into positively charged peroxide species as the main reactive species. A Langmuir–Hinshelwood model based on irreversible bimolecular reaction between adsorbed reaction species was developed to kinetically differentiate the oxidation behaviors of twelve substituted phenolic compounds. The surface reaction rate constant was identified as the key parameter controlling the reaction kinetics. To unveil the substrate-dependent reaction rules of the nonradical pathway, quantitative structure–activity relationship (QSAR) analysis was performed to correlate the surface reaction rate constants of phenolic compounds to their molecular features. A QSAR model was constructed by synergizing IE, EHOMO, and q(C–)n together to predict the reactivity of a phenolic compound in the nonradical pathway. Guided by the QSAR model, the catalytic oxidation process was applied for safe and energy-saving treatment of triclosan-contaminated water. This work is anticipated to provide valuable information for triggering and manipulating nonradical catalytic oxidation processes as well as understanding their selective oxidation nature.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yinghua Xu,Tingjie Ge,Hongxing Ma,Xufen Ding,Xiaoyong Zhang,Qi Liu
Hydrodefluorination (HDF) is the key step in fluoroaromatic pollutant (FAP) degradation, making the search for efficient HDF catalysts and the determination of the corresponding mechanism a matter of great importance. In this study, we developed an efficient HDF catalyst (a Rh-Pd alloy) and investigated the underlying catalytic reaction mechanism , using 4-fluorophenol (4-FP) as a model FAP. Specifically, the rapid aqueous-phase HDF of 4-FP at pH 3 was achieved on a Rh-Pd alloy-modified Ni foam electrode, which was followed by ring hydrogenation (RH) of the HDF product (phenol) to afford cyclohexanone and cyclohexanol . Inductively coupled plasma optical emission spectrometer (ICP-OES) and thermodynamic analyses showed that, in addition to those supplied by the applied current, the electrons involved in the HDF of 4-FP and the RH of phenol were largely provided by the oxidative dissolution of the Ni foam support. Hydrogenation and cyclic voltammetry experiments indicated that the HDF of 4-FP probably follows an indirect mechanism (featuring adsorbed H atoms as the direct reductant) and that the strength of 4-FP adsorption onto the surface of the catalyst significantly influences its HDF activity.
✓ 已验证
产品关联
DOI
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2024
·
IF 3.9
Canyang Wang,Yanxin Liu,Yayu He,Juan Li,Yi Cao
Oral exposure to nanoparticles (NPs) may affect intestinal microbiota, and this effect may be further changed by co-contaminates. In the present study, we investigated the combined effects of TiO 2 NPs and fipronil (FPN) on microbiota in mouse intestines. Mice were intragastric exposed to 5.74 mg/kg TiO 2 NPs, 2.5 mg/kg FPN, or both of them, once a day, for 30 days. The results showed that individual exposure to TiO 2 NPs or FPN decreased body weight and induced pathological changes in intestines. The exposure was also associated with increased cleaved caspase-3 protein, oxidative stress and decreased tight junction protein expression. Furthermore, the levels of diamine oxidase (DAO), lipopolysaccharide (LPS) and inflammatory cytokines in serum were also elevated, indicating increased intestinal barrier permeability. As expected, both TiO 2 NPs and FPN decreased the diversity and altered the composition of microbiota. However, the observed effects were not further enhanced after the co-exposure to TiO 2 NPs and FPN, except that Romboutsia was only significantly increased after the co-exposure to TiO 2 NPs + FPN. We concluded that oral exposure to TiO 2 NPs and FPN showed minimal synergistic effects on microbiota in mouse intestine.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yiting Liu,Yibo Wei,Xurui Li,Ning Xie,Chenhe Yao,Qiang Weng,Xingming Ning,Zhongwei An,Pei Chen,Xinbing Chen
Developing anion exchange membranes (AEMs) with simultaneous high ion conductivity and durability remains critical prerequisites for high performance fuel cell commercialization. Rational design of hydrophobic side chains has recognized as an effective approach to enhance ion transport in the AEMs through obvious microphase separation. Herein, we systematically design a series of AEMs with structurally tailored hydrophobic side-chain engineering strategy to boost both conductivity and stability. Moreover, the effects of hydrophobic side chain types on the AEM performance were thoroughly contrasted through a comprehensive investigation. Among them, the membrane 6BHC-FPhe-TMA incorporating mono-fluorine substituted alkoxy-phenyl hydrophobic side chains exhibit well-defined microphase separation, enabling exceptional high hydroxide conductivity of 161.06 mS cm −1 at 80 °C with low ion exchange capacity (1.37 mequiv. g −1 ) while maintaining controlled swelling ratio (14.08 %). Remarkable alkaline stability is evidenced by 93.24 % conductivity retention after 1344 h alkaline treatment (2 M NaOH, 80 °C). When integrated into H 2 /O 2 fuel cell, the membrane delivers a peak power density of 522 mW cm −2 and reveals outstanding durability with negligible voltage decay (0.16 mV h −1 ) during 72 h operating at 100 mA cm −2 . This work provides a novel materials design paradigm combing fluorine substituted alkoxy-phenyl side chain, offering significant progress toward practical AEMFCs applications.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）