CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Tinghao Jia,Yunbo Yu,Liuxuan Ren,Mengen Zhang,Congjing Ren,Yao Yang,Jingdai Wang,Yongrong Yang
Initiators are known to enhance hydrocarbon cracking conversion, and the development of high-performance initiators has long been a persistent goal. In this work, a binary initiator system comprising 1-nitropropane (1-NP) and triethylamine (TEA) was strategically designed to enable efficient utilization of active free radicals during initiation cracking. The results show that at 575 °C and 600 °C, the addition of 4 wt% of the binary initiator (with a mass ratio of 1-NP to TEA of 1:1) increases the cracking conversion of n- hexane by 5.01 wt% and 5.53 wt%, respectively, outperforming the combined effect of using either initiator alone at the corresponding dosages. Analysis of key intermediates from binary initiator cracking, combined with DFT calculations, reveals mutual interaction between the active free radicals generated by decomposition of 1-NP and TEA. The relatively higher activity of 1-NP promotes premature decomposition of TEA, thereby fully leveraging the cracking performance of TEA. In contrast, the relatively lower activity of TEA enables it to capture excess free radicals from 1-NP decomposition, significantly improving the utilization efficiency of the active radicals generated by 1-NP. As a result, the binary initiator system exhibits an intermolecular synergistic initiation effect during the cracking process. These findings contribute to a better understanding of the initiation mechanism and guide the design and screening of effective initiators for hydrocarbon cracking.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 13
·e53678
·
IF 3
Yewei Xu,Chunyan Yang,Hongyang Deng,Chi Zhong,Peiyu He,Tinghong Zhang,Yi Sun,Rui Yuan,Shuen Liang,Biao Kang,Guanjun Chang
A novel isoxazoline-based porous adsorbent (PB-TTNO) is prepared by click polymerization and freeze-drying from a methyl-containing bis(nitrile oxide) stable at room temperature. The introduction of four methyl groups around the nitrile oxide group reduces the activity of the bis(nitrile oxide) and make it react more mildly with polybutadiene, resulting in PB-TTNO with a more uniform pore size. Meanwhile, the electron-donating methyl groups further increase the π–π interaction between the polymer benzene ring and the TNT benzene ring. The π–π interaction enables one benzene ring in the polymer to interact with two TNT molecules to form a sandwich structure, which further improves the adsorption capacity. The synergistic effect of dual π–π interactions and dipole-π interactions makes the maximum adsorption capacity of PB-TTNO reach 235.3 mg g −1 within 12 h at 25°C. The factors such as pH value, adsorbent dosage, contact time, initial TNT concentration, and temperature are also discussed. The adsorption kinetics fit well with the pseudo-second-order model, and the Langmuir model exhibits better correlation for equilibrium data analysis. In addition, the adsorption data of PB-TTNO in real water samples are similar to those in laboratory, and the maximum adsorption capacity decreases by only 15% after five adsorption–desorption cycles.
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ChemistrySelect
·
2022
·Vol. 7
·期 35
·e202202475
·
IF 2.307
Zhiqiang Zhang,Qingyan Chu,Yuan Sun,Hao Wang,Deming Lu,Yuying Liu,Haibin Xiao,Ping Wang,Hongyou Cui,Ming Wang
Graphical The hierarchical TS-1 with abundant mesopores was prepared by TPAOH/TIPA treatment, which was applied to the reaction of the ammoximation-oxidation of acetone to 2-nitropropane. Hierarchical TS-1 catalyst performed excellent reusability and catalytic activity with 97.5 % conversion and 96.8 % selectivity. The novel technology for clean and mild synthesis of nitroalkanes has been developed. Modified TS-1 catalysts for the acetone ammoximation-oxidation reaction were prepared by post-treating TS-1 with different concentrations of TPAOH/TIPA, and the effects of alkali treatment on the catalytic performance were systematically investigated. The techniques such as XRD, SEM, TEM and N 2 sorption were used to characterize the catalyst samples, which exhibited that the introduction of alkali increased the volume and quantity of mesopores, while there was no obvious influence on the framework structure and titanium content in the framework. And the improvement in catalyst performance after alkali treatment was attributed to the increase of mesopores and the decrease in diffusion limitation. In addition, three common ammoximation catalysts (Ti-MOR, Ti- MWW and TS-1) were systematically investigated in this reaction. Ti-MOR showed superiority in the ammoximation to oxime, while TS-1 displayed the best catalytic performance in the ammoximation oxidation of ketones to nitroalkanes. It was indicated that modified TS-1 could be a promising catalyst for the ammoximation-oxidation reaction of acetone.
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Analytical Methods
·
2022
·Vol. 14
·期 39
·3881-3889
·
IF 3.532
Jiao Luo,Hongyan Tan,Bin Yang,Donghua Chen,Junjie Fei
In this study, a mesoporous silica fluorescence probe co-doped with manganese-doped zinc sulfide quantum dots (Mn:ZnS QDs) and rhodamine B (RB) and coated with molecularly imprinted polymer (MIP) has been prepared by sol–gel methods. The morphology and structure were characterized in detail by transmission electron microscopy (TEM), Fourier transform-infrared absorption spectroscopy (FT-IR) and ultraviolet-visible absorption spectroscopy (UV-vis). The probe exhibited two characteristic emission peaks at 411 nm and 582 nm, and the synchronous ratiometric fluorescence responses F411/F582 to different concentrations of 4-nitrophenol (4-NP) showed a good linear correlation in the range of 0.01–10 μmol L−1 besides achieving the sensitive detection of 4-NP with a detection limit as low as 3.0 nmol L−1 (3σ). The probe possesses the advantages of selectivity toward the target molecular structure, self-stability in the detection time domain and anti-interference ability, exhibiting excellent potential for application in 4-NP detection in different water environments.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Liang Zhu,Xuecui Mei,Zhengchun Peng,Jiao Yang,Yingchun Li
Paper-based microfluidic analytical devices (μPADs) have recently attracted attention as a rapid test kit owing to their low cost and nonrequirement for external driving pump. However, low accuracy and poor anti-interference ability of μPADs under complex detection condition limit their practical applications. Here, we present a facile way to prepare a novel fluorescence sensor-array μPAD for multi-analyte discrimination based on molecular imprinting technology , and its sensing behavior was studied by using three nitrophenol (NP) isomers (2-, 3-, and 4-NP) as the testing models. Carbon quantum dots (CQDs) emitting blue light were grafted on glass-fiber paper, followed by in-situ modification of three types of molecularly imprinted polymers (MIPs) with 2-, 3-, and 4-NP as template. Each sensing unit on the array showed differential yet cross-reactive binding affinity to NP isomers, resulting in distinct fluorescence quenching efficiency. Thus, precise distinguishment of the three NPs was realized with the MIPs/CQDs/paper-based sensor array. Furthermore, the discrimination ability of the platform was evaluated in mixtures of the NP isomers. Practicability of this apparatus was validated by identification of blind samples and 100% accuracy was achieved. The μPAD has proven to be highly sensitive and accurate, which will serve as an ideal analytical tool in the fields of environment monitoring, disease prognosis, food safety and so on.
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高影响因子
TALANTA
·
2020
·
IF 5.339
Xue Li,Yuan-Yuan Cui,Cheng-Xiong Yang
Microporous organic networks (MONs) have shown great promise in separation science recently. Exploring novel, simple and convenient strategy to fabricate MONs coated capillary columns for gas chromatography (GC) still remains challenging but desirable for the development of MONs in chromatographic separation. To extend the potential application of MONs in separation science and to further develop novel method for the fabrication of MONs-based capillary columns, here we demonstrate a novel covalent coupling strategy to fabricate uniform MONs bonded capillary columns for GC separation of position isomers and hydrocarbons. The bare capillary column was firstly modified with (3-bromopropyl)trimethoxysilane to provide bromine sites for coupling with alkynyl monomers . The amino- and hydroxyl-functionalized MONs (MON-NH 2 and MON-OH) were then directly grown onto the inner wall of the brominated capillary columns via the covalent coupling between bromine and alkynyl groups. The uniform MON-NH 2 and MON-OH bonded capillary columns were obtained and showed good resolution for GC separation of dichlorobenzene , chlorotoluene, bromotoluene, and propylbenzene position isomers and many other hydrocarbons including linear alkanes, alkylbenzenes , pinene isomers, cyclohexane and benzene, ketones and aldehydes. The MONs bonded capillary columns also owned good lifetime and precision for dichlorobenzene isomers with the relative standard deviations (RSDs) of 0.2–0.3%, 1.2–2.1%, and 1.7–2.5% for retention time, peak height and peak area, respectively. In addition, the fabricated MON-NH 2 and MON-OH bonded capillary columns offered better resolution than commercial InertCap-1, InertCap-5, InertCap-1701 and InertCap-WAX capillary columns for the separation of chlorotoluene and bromotoluene position isomers. These results revealed the feasibility of covalent coupling strategy to fabricate MONs-based stationary phases in GC, highlighting the potential of MONs in separation science.
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高影响因子
POLYMER SCIENCE SERIES B
·
2020
·Vol. 61
·期 6
·785-794
·
IF 0.976
Yonglin Lei,Yao Xiang
Abstract 2,5-Diethyl-1,4-benzenedinitrile N -oxide was designed and synthesized to achieve room temperature curing of hydroxyl-terminated polybutadiene binders. The structures and properties of the four cured elastomers having different content of curing agent were investigated. The results showed that the isoxazoline rings from the reaction of nitrile N -oxide with cis -alkene are observed in the four cured elastomers. The results also revealed that the hydroxyl-terminated polybutadiene with the lowest content of curing agent showed the lowest cross-linking density and stress at break. The proper activity and steric hindrance of 2,5‑diethyl-1,4-benzenedinitrile N -oxide gave better mechanical properties and hydrophobic properties of the cured elastomers than nitrile N -oxide prepared by our previous work.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Junhua Li,Lingzhi He,Jianbo Jiang,Zhifeng Xu,Mengqin Liu,Xing Liu,Haixia Tong,Zeng Liu,Dong Qian
In this work, three kinds of bimetallic Prussian blue analogues (PBAs), i.e. K x Ni [Fe(CN) 6 ]·nH 2 O (NiFe-PBA), K x Co [Fe(CN) 6 ]·nH 2 O (CoFe-PBA), and K x Mn [Fe(CN) 6 ]·nH 2 O (MnFe-PBA), were synthesized by a simple precipitation method under identical conditions. Their chemical compositions , structures, morphologies, valences of transition metals, and electrochemical sensing performances for 2-nitrophenol (2-NP) are examined in details. It is found that all the prepared PBAs hold face-centered-cubic structures with near perfect cube morphologies for NiFe-PBA and CoFe-PBA and truncated cube morphology for MnFe-PBA. For the electrochemical detection of 2-NP, a wide detection range of 1.0–700.0 μM was obtained at all PBAs modified electrodes together with the sensitivities of 443.3, 368.0, and 339.0 μA cm −2 mM −1 and detection limits of 0.28, 0.46, and 0.59 μM achieved at NiFe-PBA, CoFe-PBA, and MnFe-PBA modified electrodes, respectively. The superiority in electrochemical sensing performance of NiFe-PBA to CoFe-PBA and MnFe-PBA may stem from its higher conductivity, lager electroactive surface area, and better intrinsic catalytic property of the transition metal in its framework. Furthermore, the constructed NiFe-PBA-based sensor displays good repeatability, long-term stability, and high selectivity together with desirable recoveries (97.8–103.9%) for the assay of 2-NP in water samples. The present work is the first report on the PBAs-based electrochemical sensors for 2-NP detection, which may promise a future of PBAs or PBAs-based materials for sensing applications.
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ELECTROPHORESIS
·
2019
·
IF 2.754
Yuan-Yuan Cui,Huan Yao,Cheng-Xiong Yang,Xiu-Ping Yan
Microporous organic networks (MONs) are a new class of porous materials synthesized via Sonogashira coupling reactions between organic building blocks. Here we report an in situ synthesis approach to fabricate MONs coated capillary column for high resolution GC separation of hydrocarbons. The McReynolds constant evaluation reveals the MONs coated capillary is a non-polar column. The MONs coated capillary column shows good resolution for GC separation of diverse important industrial hydrocarbons such as linear and branched alkanes, alkylbenzenes, pinene isomers, ethylbenzene and styrene, cyclohexane and benzene. The MONs coated capillary column gave a high column efficiency of 1542 plates per meter for hexane and good precision for replicate separations of the selected hydrocarbons with the RSDs of 0.2–0.3, 1.5–3.1, and 1.9–3.3% for retention time, peak height and peak area, respectively. The MONs coated capillary also offered better resolution than commercial Inert Cap-1 and Inert Cap-5 capillary columns for hexane and heptane isomers. These results reveal the potential of MONs as novel stationary phases in GC.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Lei Han,Shi Gang Liu,Jia Yu Liang,Yan Jun Ju,Nian Bing Li,Hong Qun Luo
Being a common hazardous waste, 4-nitrophenol (4-NP) has caused a serious threat to humans and environment. Therefore, rapid and selective detection of 4-NP, especially using a simple and portable instrument, is highly desired for human health and environmental monitoring. Herein, we develop a novel pH-mediated reversible fluorescence nanoswitch for selectively detecting 4-NP by using water-soluble fluorescent polymer carbon dots (PCDs) as a probe. The fluorescence of PCDs can be quenched by 4-NP via inner filter effect (IFE) because its excitation spectrum well overlaps with the absorption spectrum of 4-NP under alkaline condition. However, an obvious blue shift of the absorption peak of 4-NP occurs under acidic condition, causing the fluorescence recovery of PCDs due to the disappearance of IFE. On the basis of this principle, a pH-mediated reversible fluorescence nanoswitch was constructed and a broad linear range was obtained from 0.5 to 60 μM with a detection limit of 0.26 μM for 4-NP. Furthermore, this approach was successfully applied to detect 4-NP in real water samples and a portable polyamide film-based sensor was developed for visual detection of 4-NP, which offers a promising platform for the detection of 4-NP in on-site and resource-poor settings.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Xiao-Qiong Wu,Xing-Wen Wu,Qing Huang,Jiang-Shan Shen,Hong-Wu Zhang
Developing hydrogel systems featured by catalytic active is of importance to construct highly effective platforms for removing environmental pollutants/hazardous substances or for bio-/chemosensing. Reported herein are our recent finding that Au nanoparticles could be in situ prepared in chitosan-Au III hydrogel system via photoreduction, and the as-prepared Au nanoparticles could be employed for the catalytic reduction of a series of nitroaromatic compounds by sodium borohydride (NaBH 4 ). Experimental conditions of synthesizing Au nanoparticles, including pH, concentration of Au III , and light irradiation time were systematically investigated. The as-prepared Au nanoparticles were characterized by UV–vis absorption spectroscopy, X-ray diffraction (XRD), transmission and field emission scanning electron microscopy (TEM and FESEM). This is the first example for in situ formed metal nanoparticles in chitosan hydrogel systems via photoreduction. The effectiveness of the as-prepared Au nanoparticles as nanocatalysts was evaluated by employing the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH 4 as a model reaction. The catalytic reduction reaction was found to be very efficient and to follow a pseudo-first-order kinetics. The as-prepared Au nanoparticles demonstrated good reusability and stability. The reduction of a series of other nitroaromatic compounds including highly explosives 2,4,6-trinitrophenol (2,4,6-tNP) and 2,4,6-trinitrotoluene (2,4,6-tNT) was achieved by means of this catalytic system.
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RSC Advances
·
2014
·Vol. 4
·期 90
·49287-49294
·
IF 3.708
Xiao-Qiong Wu,Xing-Wen Wu,Jiang-Shan Shen,Hong-Wu Zhang
Developing robust and facile catalytic systems for converting nitroaromatic compounds to NH2-containing compounds are of importance to decrease or even eliminate their toxicity or risk in the environment. In view of in situ formed metal nanoparticles, the metal ion (Cu2+, Ag+, AuCl4−, Co2+ and Ni2+)/NaBH4 systems were employed to catalyze the reduction reaction of nitroaromatic compounds. By employing the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) as a model reaction, the effects of concentration of NaBH4, 4-NP and metal ions on the rate constants of the catalytic reduction reactions were systematically investigated. Apparent activation energies of these metal ion/NaBH4 catalytic systems were further measured and compared. In situ formed metal NPs could be characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Furthermore, these metal ion/NaBH4 systems were successfully employed to catalyze the reduction reaction of a series of other nitroaromatic compounds. These metal ion/NaBH4 catalytic systems investigated in this protocol are simple and do not require the preparation of metal nanoparticles in advance, compared with previous related reports.
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