APPLIED CATALYSIS B-ENVIRONMENTAL
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2013
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IF 5.825
Xin Xiao,Chunlan Xing,Guangping He,Xiaoxi Zuo,Junmin Nan,Lishi Wang
A facile solvothermal route is successfully developed to synthesize Bi 4 O 5 I 2 , a novel I-poor bismuth oxyiodide, with hierarchical nanoflake structure. The composition, structure, morphology, formation mechanism, photoabsorption, energy band, and photocatalytic properties of this material are systematically investigated. The results reveal that highly pure Bi 4 O 5 I 2 can be easily obtained by reacting Bi 3+ , I − , and OH − at pH values of 6 to 10 under solvothermal conditions, and the formation of such hierarchical structure can be explained by a dissolution–recrystallization mechanism. The as-synthesized Bi 4 O 5 I 2 nanoflakes show a favorable energy band structure (bandgap energy 2.17 eV, conduction band edge potential is more negative than the reduction potential of superoxide radicals), a high specific surface area (38.6 m 2 g −1 ), and a hierarchical micro/nano structures. Thus, they exhibit superior photocatalytic and mineralization efficiency for the degradation of 4- tert -butylphenol (PTBP, a representative alkylphenol) under visible light irradiation, with a reaction rate is 6.8 and 57 times faster than that of BiOI microspheres and N-doped TiO 2 , respectively. The photogenerated reactive species and degradation intermediates are identified, and possible photocatalytic mechanism is proposed. What's more, the as-synthesized Bi 4 O 5 I 2 nanoflakes remain stable during the photocatalytic reaction and can be used repeatedly, revealing their promising applications in the treatment of organic wastewaters.
研究领域:
材料科学
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环境科学
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JOURNAL OF CATALYSIS
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2023
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IF 7.3
Bowen Xu,Mengshan Deng,Kehang Lin,Yuexia Wang,Xinqing Lu,Rui Ma,Yanghe Fu,Weidong Zhu
The Ti-MWW zeolites with a layered morphology, synthesized by a conventional method, usually show low catalytic activities in the epoxidation of bulky alkenes due to the serious steric constraint imposed by the zeolite micropores and the adverse effects from some extra-framework octahedral Ti species. In the present work, the Ti-MWW zeolite was prepared by the reaction of an ultra-thin layered borosilicate MWW-type zeolite (D-ERB-1) with tetrabutyl orthotitanate (TBOT) in a HNO 3 aqueous solution, wherein D-ERB-1 was hydrothermally synthesized by introducing an organosilane into the synthetic gel. In combination with the results from extensive characterizations for the synthesized zeolites, it is found that the currently synthesized Ti-MWW zeolite without extra-framework octahedral Ti species has thinner nanosheets that are very helpful to the epoxidation of cycloalkenes with tert-butyl hydroperoxide (TBHP), and is more active than the conventional Ti-MWW and other titanosilicate zeolites. Moreover, the developed catalyst is recyclable after the regeneration of the deactivated zeolite by washing with acetonitrile (MeCN). Therefore, the present work provides some guidance in the development of an efficient titanosilicate catalyst for the epoxidation of bulky alkenes.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
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IF 2.6
Zhenxing Cai,Pingxin Li,Hui Zhao,Lingyan Wang,Xiaobo Chen,Chaohe Yang
The solubility of cyclohexanone, tert-butanol, and 1,4-dioxane in p-, o-, and m-xylenes and ethylbenzene was measured by a gas chromatography method under an atmospheric environment. The measured data indicated that the solubility of cyclohexanone, tert-butanol, and 1,4-dioxane in the xylenes and ethylbenzene increases with increasing temperature. The experimentally determined solubility results were fitted with the modified Apelblat equation, Van’t Hoff equation, and Wilson model. Among them, the Wilson model was most consistent with the measured solubility results. The dissolution-related thermodynamic properties of cyclohexanone, tert-butanol, and 1,4-dioxane in xylenes and ethylbenzene, including the changes of molar Gibbs free energy, molar enthalpy, and molar entropy, were predicted and analyzed via the correlated Wilson model, which indicates that the dissolution behaviors are spontaneous and endothermic process. The obtained solubility results provide the thermodynamic foundation for the development and upgrading of industrial separation processes related to xylene, ethylbenzene, cyclohexanone, tert-butanol, and 1,4-dioxane.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2023
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IF 4.3
Xia Jiaojiao,Liu Feng,Yan Lishi,Suo Hongbo,Qian Jingya,Zou Bin
In this study, a Zinc porphyrin based covalent organic framework (COF-366-Zn) was synthesized by imine condensation reaction . And the multi-walled carbon nanotubes(MWCNTs) were interspersed on COF-366-Zn to enhance the electron transfer between the material and the electrode surface. The composite material was used to design a COF-366-Zn/MWCNTs/Nafion/GCE sensor. The sensor performance for simultaneous electrochemical detection of antioxidants was investigated. It was found that the COF-366-Zn/MWCNTs/Nafion/GCE sensor could simultaneously detect tert-butylhydroquinone (TBHQ), butylated hydroxyanisole (BHA) and phenol in actual samples with good detection performance. At the same time, the mutual interference between the three analytes was studied. The detection limits are 0.025 μM, 0.056 μM and 0.051 μM, respectively. In addition, the sensor also exhibits excellent anti-interference performance and storage performance.
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ACS Applied Polymer Materials
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2022
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IF 4.855
Xu Yang,Hong Zhao,Chunyang Li,Xindong Zhao,Jiaming Yang,Xuan Wang
Polypropylene (PP), as a recyclable thermoplastic polymer, is a promising insulating material for application as an environmentally friendly insulation layer in high-voltage-direct-current (HVDC) cables. However, the lack of toughness and the poor wide-temperature-range electrical properties under a DC electric field seriously restrict its development and application. Herein, a block polypropylene with a low elastic modulus is selected and grafted with organic molecules of maleic anhydride (MAH) and 4-tert-butylstyrene (St*) as a masterbatch (PP-g-(St*-co-MAH)) by an ultraviolet-irradiated radical reaction. The modified b-PP with different grafting contents was prepared by diluting the masterbatch through melt blending, and their DC electrical properties at a wide temperature range of 40–100 °C were tested. The results indicate that the introduction of a comonomer St* significantly improves the grafting rate of MAH and suppresses the degradation of PP chains during the grafting reaction; thus, the PP-g-(St*-co-MAH) possesses improved thermogravimetric performance and maintains the original mechanical properties and workability. The grafted functional groups introduce deep charge traps into the matrix and thus effectively suppress the space charge injection and accumulation, significantly reduce the conductivity, and enhance the breakdown strength of PP at wide temperature ranges. Among the tested materials, the PP grafted with 0.57 wt % St*-co-MAH exhibits the best electrical properties, while inadequate or excessive grafting content of St*-co-MAH relatively weakens the positive effects of grafting modification. The mechanism is analyzed based on calculation of the trap level and the three-dimensional (3D) electric potential.
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POLYMER INTERNATIONAL
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2023
·Vol. 72
·期 5
·520-531
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IF 3.2
Yaqing Wen,Chunshan Lu,Guofei Chen,Xingzhong Fang
Two series of poly(ester-amide-imide)s (PEsAIs) with simultaneously bulky side groups, ester and amide bonds were synthesized by copolymerization of tert -butylhydroquinone bis(trimellitate anhydride), p -phthaloyl chloride and other monomers. These PEsAIs had glass transition temperatures ( T g s) in the range of 231–301 °C, coefficients of thermal expansion (CTEs) of 17–59 ppm K −1 and displayed good mechanical properties with tensile modulus of 2.6–4.5 GPa, tensile strengths of 63–143 MPa and elongations at break of 3.0%–11.7%. All films had good transparency with transmittances at 400 nm ( T 400nm ) of 43%–80%. The introduction of p -phthaloyl chloride successfully improved the properties of the polymer with higher transmittance, higher T g and lower CTE. In particular, PEsAI-b-60 presented the best comprehensive performance with a moderate T g of 301 °C, low CTE of 17 ppm K −1 and high transmittance ( T 400nm ) of 75%. © 2023 Society of Industrial Chemistry.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yanli Zhang,Ke Xue,Huiyuan Li,Shuyi Lian,Chunyang Han,Zhaoyou Zhu,Yanyue Lu,Jianguang Qi,Yinglong Wang
Petroleum wastewater contains large amounts of methyl tert-butyl ether (MTBE) and ethanol azeotropes . Efficiently and cleanly separating these azeotropes while conserving energy and reducing the emission of petroleum wastewater is an urgent problem that needs to be solved. In this work, the process of extracting MTBE from petroleum wastewater with water and ionic liquids (ILs) mixed extractant was clarified, and a complete method of evaluating the extraction performance based on the COSMO-SAC model, liquid-liquid extraction measurement, and micro-scale analysis mechanism is proposed. The COSMO-SAC model was used to determine organic solvents and ILs with the best extraction performance from among more than 250 ILs. A mixed solvent of water and the IL 1-ethyl-2,3-dimethylimidazolium ethylsulfate ([EMMIM][EtSO 4 ]) at different molar ratios was selected for the liquid-liquid extraction experiment. It was found that the distribution coefficients and selectivity were maximum when the molar ratio of [EMMIM][EtSO 4 ] to water was 1:2. Combined with molecular dynamics simulations and quantum chemical calculations, the interaction mechanisms of different solvents with MTBE and ethanol were revealed on the micro-level. This work provides a prototype for the high-efficiency extraction of MTBE from petroleum wastewater using a new mixed solvent of ILs and water, and it provides an application prospect for the efficient and green recycling of MTBE.
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FOOD CHEMISTRY
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2022
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IF 9.231
Zou Bin,Liu Feng,Yan Yan
This study constructed a novel biomimetic enzyme electrochemical biosensor based on tetraphenyl metalloporphyrins functionalized multi-walled carbon nanotubes (MWCNTs). The effect of central metal ions on the catalytic activity of tetraphenyl metalloporphyrin biomimetic enzyme was investigated. It was found that the change of central metal ions had a significant effect on the catalytic performance of metalloporphyrin and Zinc(II) tetraphenylporphyrin (ZnTPP) had the most excellent catalytic property. The electrochemical behaviors of tert-butylhydroquinone (TBHQ) on ZnTPP/MWCNTs modified electrode were investigated. It was found that the redox peak current was increased significantly, which was attributed to the redox peak current to the electrocatalytic activity of ZnTPP and the synergistic effect between ZnTPP and MWCNTs. A strong linear relationship was shown in the concentration range of 0.01 to 1000 μM. This electrochemical sensor also had excellent repeatability, storage, and interference resistance. This work provided a simple and sensitive method for the determination of TBHQ.
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Fei Yan,Meifang Wang,Qifan Jin,Huaxu Zhou,Liuhong Xie,Hongliang Tang,Jiyang Liu
This work demonstrates the electrochemical preparation of graphene on glassy carbon electrode (GCE) for stable growth of vertically-ordered mesoporous silica films (VMSF) by using electrochemically assisted self-assembly (EASA) method and investigates its anti-fouling electrochemical detection performance of tert -butylhydroquinone (TBHQ) in real toning lotion and edible oil samples. Electrochemical reduction of graphene (ErGO) involves in two steps, namely, graphene oxide (GO) being first dropped onto the GCE surface and then being underwent electrochemical reduction by potentiostatic method. In comparison with the bare GCE, oxygen-containing groups and two-dimensional planar structure of ErGO render the more suitable microenvironment for the stable growth of VMSF. Owing to the signal amplification effect of highly electroactive ErGO and preconcentrated capacity of VMSF, the obtained VMSF/ErGO/GCE presents an excellent analytical sensitivity (26.17 μA/μM), a relatively low limit of detection (0.23 nM) and a rather wide linear range (1 nM–120 μM) toward TBHQ. The proposed approach is green and can be successfully applied to sensitively determine TBHQ in toning lotion and edible oil samples with good anti-fouling ability and long-term stability.
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高影响因子
RARE METALS
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2020
·Vol. 40
·期 2
·478-488
·
IF 2.161
Tang Jing,Zheng Sheng-Biao,Jiang Si-Xun,Li Jie,Guo Teng,Guo Jia-Hao
Abstract In this work, the framework of Co nanoparticles and nitrogen-doped carbon nanotubes (Co/NCNTs) derived from metal–organic frameworks (MOFs) through solid pyrolysis was successfully synthesized in the atmosphere of H 2 and Ar gases. The Co/NCNTs composites exhibited superior electrocatalytic performance for tert-butyl hydroquinone (TBHQ) oxidation due to the synergistic effect between chemical composition and the specific structure of Co nanoparticles and nitrogen-doped carbon nanotubes. It was found that the reaction underwent a quasi-reversible redox reaction with 37-fold higher anodic current for TBHQ at Co/NCNT-modified electrode when compared to bare glassy carbon electrode (GCE). In optimal condition, Co/NCNTs/GCE exhibited a linear range of 0.05–80.00 μmol·L −1 for detecting TBHQ, and the limit of detection (LOD) was estimated to be as low as 10 nmol·L −1 (signal/noise of S/N = 3). Moreover, the as-obtained modified electrode was successfully used to assay the content of TBHQ in edible oil samples. Graphic abstract
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 42
·期 3
·2211-2220
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IF 1.221
Liu Shuilin,You Kuiyi,Jian Jian,Luo Qing,Liu Pingle,Ai Qiuhong,Luo He’an
A simple and effective approach for highly selective preparation of nitrocyclohexane from cyclohexane using tert-butyl nitrite as a nitrating agent under atmospheric pressure has been successfully developed in this work. The results indicate that the N -hydroxyphthalimide catalyst gave the best results with 27.3 % of cyclohexane conversion and 88.0 % of selectivity to nitrocyclohexane under optimal reaction conditions. The present reaction provides a novel strategy for the synthesis of nitroalkanes from the nitration of low-carbon alkanes because of the mild reaction condition, simple experimental procedure and high selectivity towards the desired product. This method may be very significant to establish such a synthesis method for aliphatic nitro-compounds from the low-carbon alkanes in organic fields.
研究领域:
有机化学
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合成化学
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
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IF 5.2
Qiuyu Wang,Maoyuan Hu,Wanke Zhou,Junchun Guo,Sheng Li,Xiaoli Xiong,Jinglin Li
ZIF-derived N,P,S-HCNFs provide a porous electroactive interface for TBHQ sensing. • Single- and dual-doped controls with DFT support cooperative heteroatom regulation. • Two linear ranges of 0.9–12 and 12–127 μM were achieved with a 0.075 μM LOD. • Reliable TBHQ quantification was demonstrated in spiked edible-oil samples. • Extra Trees enables validated auxiliary calibration in complex oil matrices. Tert-butylhydroquinone (TBHQ) is a widely used synthetic phenolic antioxidant, and its excessive use in edible oils raises food-safety concerns. Herein, N, P, and S tri-doped hollow carbon nanofibers (N,P,S-HCNF) with interconnected porous channels were fabricated via an electrospinning–pyrolysis strategy. The hollow architecture and heteroatom-induced defects provide abundant electroactive sites and facilitate electron/mass transfer, enabling sensitive electrochemical oxidation of TBHQ. The N,P,S-HCNF/CP sensor exhibited two linear response ranges of 0.9–12 μM and 12–127 μM, with a detection limit of 0.075 μM. Acceptable selectivity, reproducibility, and storage stability were obtained. Single- and dual-doped controls combined with DFT calculations provided mechanistic insight into the enhanced TBHQ adsorption and interfacial electron transfer of N,P,S-HCNF, including preferential interactions involving the phenolic hydroxyl groups. An externally validated Extra Trees calibration model was further employed as an auxiliary strategy to reduce matrix-related prediction bias, integrating hollow carbon nanofiber engineering, multielement heteroatom regulation, mechanistic analysis, and data-driven quantification for TBHQ electrochemical determination in edible oils. A defect-rich N,P,S-doped hollow carbon nanofiber interface enabled sensitive electrochemical oxidation of TBHQ, while DFT supported favorable adsorption and interfacial charge redistribution and machine learning provided auxiliary calibration for improved quantification in edible-oil matrices. Download: Download high-res image (128KB) Download: Download full-size image
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