RSC Advances
·
2017
·Vol. 7
·期 17
·10124-10131
·
IF 3.108
Huanqin Zhao,Baolong Wang,Qingpan Li,Liying Wang,Junmin Sun,Yongfeng Zhang,Lichun Ji,Zhenzhu Cao
Living radical polymerization (LRP) of tert-butyl acrylate (tBA) was carried out via dispersion and soap-free emulsion polymerization mediated by cobalt porphyrin [cobalt tetramethoxyphenylporphyrin, (TMOP)Co(II)] and initiated by 2,2′-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (VA-044), respectively. The living character was demonstrated by the linear first-order kinetics with different feeding ratios of tBA and (TMOP)Co(II) and a linear increase in the number-average molecular weight was observed with the monomer conversion, as well as the relatively narrow polydispersity. However, only few studies have been reported on (TMOP)Co(II) mediating a living radical dispersion or soap-free emulsion polymerization of tBA. In addition, the obtained poly(tert-butyl acrylate) (PtBA) particles exhibited good uniformity and controlled particle size whether in the dispersion system or in the soap-free emulsion polymerization.
研究领域:
高分子化学
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材料科学
·
纳米技术
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
·
IF 7.435
Guangping He,Chunlan Xing,Xin Xiao,Ruiping Hu,Xiaoxi Zuo,Junmin Nan
Novel three-dimensional flower-like Bi 12 O 17 Cl 2 /β-Bi 2 O 3 composites are prepared using a facile solvothermal-calcining process and their photocatalytic performances for the degradation of 4- tert -butylphenol (PTBP, a representative alkylphenol) are evaluated under visible light irradiation. The formation of such composites is assumed to involve the reduction of Bi(III) to nano-metallic bismuth via a solvothermal process, followed by the reaction of bismuth with oxygen and bismuth oxide chloride hydroxide during the calcination in air. The XRD, XPS, EDS mapping, HRTEM, UV–vis DRS, and photocurrent measurement results indicate that heterojunctions are formed between Bi 12 O 17 Cl 2 and β-Bi 2 O 3 with broad contact interfaces. The as-synthesized Bi 12 O 17 Cl 2 /β-Bi 2 O 3 hybrid materials possess favorable band structures, heterojunction structures, relatively high specific surface areas, and hierarchical micro/nano-structures, resulting in superior photocatalytic and mineralization efficiencies for the decomposition of PTBP under visible light irradiation. The optimum photocatalytic activity of a Bi 12 O 17 Cl 2 /β-Bi 2 O 3 sample is approximately 3, 12, 51, and 107 times higher than the activities of single β-Bi 2 O 3 , Bi 12 O 17 Cl 2 , nitrogen-doped TiO 2 , and BiOCl, respectively. In addition, the photogenerated reactive species are identified based on free radicals trapping experiments and EPR analysis, which reveals that the photodegradation of PTPB over Bi 12 O 17 Cl 2 /β-Bi 2 O 3 under visible light is dominated by direct hole and superoxide radical oxidation rather than oxidized by hydroxyl radical.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Small
·
2023
·
IF 13.3
Xiaoyu Gu,Chengwei Shan,Xiaowei Xu,Qian Liu,Aung Ko Ko Kyaw
All inorganic perovskite based on CsPbI 2 Br has attracted significant attention due to its relatively thermal stable structure compare to its hybrid counterparts. With a wide bandgap of 1.9 eV and excellent light absorption capability, it has been extensively explored for applications in indoor photovoltaics and as a front absorber in tandem devices. However, the uncontrollable crystallization process during solvent evaporation and thermal annealing leads to both macroscopic defects like cracks and microscopic defects such as voids. In this study, a metastable adduct with lead (II) halides by incorporating 4-tert-butyl pyridine as a volatile Lewis base monodentate ligand in the precursor solution is formed. The strategic preferential decomposition of the adduct during the early-stage low-temperature annealing facilitated the desorption of lead (II) halides, inducing antisolvent-free heterogenous nucleation. This, in turn, promoted crystal growth during subsequent high-temperature annealing, resulting in dense films with low defect density. As a result, a maximum open-circuit voltage of 1.30 V is achieved with the champion power conversion efficiency of 16.5% in CsPbI 2 Br-based perovskite solar cell. The work reveals a new mechanism of using Lewis acid-base adduct to obtain high quality perovskite films other than hindering crystallization in traditional way.
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 30
·e54085
·
IF 3
Xiao-Peng Wang,Feng-Hang Yao,Jie Chen
In this study, a reactive hindered phenol antioxidant, 3,5-di- tert -butyl-4-hydroxyphenyl methyl isobutylene ester (DBHMIE), was synthesized and used to improve the antioxidant performance of ABS (acrylonitrile-butadiene-styrene terpolymer) resin. The chemical structure of DBHMIE was determined with Fourier transform infrared spectroscopy, 1 H nuclear magnetic resonance (NMR), and 13 C NMR spectroscopy. Moreover, the effects of the DBHMIE content on the antioxidant capabilities, thermal stabilities, tensile strengths, impact strengths, and morphologies of the ABS/antioxidant systems were investigated. The results indicated that the oxidation induction temperatures of the systems increased from 229.7 to 245.4°C as the DBHMIE content was increased from 0 to 0.5 wt%. The 5% mass loss temperature of the system was increased from 338.4 to 347.8°C by the addition of 0.3 wt% DBHMIE. The impact strengths of the systems increased with increasing DBHMIE content up to 0.1 wt% and then decreased. The addition of DBHMIE did not significantly affect the tensile strength of the ABS resin. SEM images showed that the DBHMIE was uniformly distributed in the ABS resin at low DBHMIE contents and agglomerated at high DBHMIE contents.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 18
·e53801
·
IF 3
Yulai Zhao,Lianzhi Shen,Yu Yuan,Longqiang Xiao,Jingyu Cai,Zhen Lu,Linxi Hou
Developing low-cost and highly efficient hydrophobic absorbents via simple and environmentally friendly method is demanded for oil-water separation. This paper reports the preparation of hydrophobic absorbents of porous poly(4-tert-butylstyrene- co -divinylbenzene) (poly( t BS- co -DVB)) via high internal phase emulsion (HIPE) template method. The effects of crosslinking degree and internal phase volume fraction on the porous structure and adsorption performance of the absorbents are investigated. As the t BS/DVB molar ratio increases from 1:1 to 4:1, the adsorption performance of poly( t BS- co -DVB) toward hexane first increases to a maximum at a molar ratio of 3:1 and then decreases. As the internal phase volume fraction increases, the specific surface area (SSA) and porosity of the poly( t BS- co -DVB)s notably increase from 33.06 m 2 /g and 84.07% to 102.89 m 2 /g and 92.94%, respectively. When the internal phase fraction is 95 vol%, the obtained poly( t BS- co -DVB) foam with a water contact angle of 140° shows an absorbing capacity as high as 70.21 g/g for dichloromethane. After 10 consecutive adsorption-desorption cycles, the adsorption performance of the poly( t BS- co -DVB) foam shows only a slight decrease, indicating an excellent recycling ability. The obtained poly( t BS- co -DVB) foams exhibit the advantages of facile preparation, high oil absorption capacity and satisfactory recoverability, which enable them potential as sustainable oil adsorbents.
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高影响因子
MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Zhijuan Wang,Ran Han,Lin Li,Jiaqing Sun,Jingying Yang,Mingfei Pan,Shuo Wang
A facile, ultra-sensitive and cost-effective electrochemical sensor was successfully prepared by combining metal–organic framework ZIF-8 with MWCNTs-COOH, which detecting of tert -butylhydroquinone (TBHQ) in edible oil and fried foods. The hydrothermally synthesized ZIF-8 material with microporous structure was demonstrated to have large specific surface area, and together with the MWCNTs-COOH with high electrical conductivity and catalytic properties, was used as a modified substrate for electrodes. Because of the synergistic effect between ZIF-8 and MWCNTs-COOH, the modified electrode exhibited significant electrocatalytic ability for TBHQ. Under the optimal experimental conditions, the ZIF-8/MWCNTs-COOH modified electrode obtained good linearity when the TBHQ concentration ranged from 0.01 to 25.0 μg mL −1 with the LOD (limit of detection) of 0.009 μg mL −1 (S/N = 3). Moreover, the constructed electrochemical sensor exhibits better anti-interference capability, reproducibility and stability, and can be used to monitor the content of TBHQ in oil and fried foods.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Bingyan Han,Qifang Yan,Qingdong Liu,Dan Li,Yajun Chen,Gaohong He
In recent years, non-conjugated polymer dots (PDs) have attracted considerable interests due to their fundamental importance and potential applications in diverse areas. Herein, we synthesized the green emissive non-conjugated PT PDs with polyethyleneimine (PEI) and tetrakis(hydroxymethyl)phosphonium chloride (THPC) as precursors in one-pot at room temperature with the quantum yield at 25%. Surprisingly, PT PDs solutions could be transformed to hydrogels by pH alteration. By characterization, PT PDs hydrogels performed porous structure with large surface area and positively charged functional groups. Anionic dyes could be easily adsorbed into PT PDs hydrogels through multiple electrostatic interactions. In addition, PT PDs could specifically detect tert -butylhydroquinone (TBHQ) with a low detection limit (27 µM), suggesting their high sensitivity. More importantly, the developed method was successfully applied the detection of TBHQ in the peanut oil, implicating their practical application.
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高影响因子
Chemosensors
·
2022
·Vol. 10
·期 7
·260
·
IF 4.229
Zhaoxia Shi,Ling Xia,Gongke Li,Yufei Hu
High purity methyl tert-butyl ether (MTBE) can be used to adjust gasoline octane values. However, an isomer, methyl sec-butyl ether (MSBE), is the main by-product of its industrial production, and this affects the purity of MTBE. Pt/Au NPs@Co3O4composites with a hollow dodecahedron three-dimensional structure were synthesized using ZIF-67 as a template, with Pt and Au nanoparticles (NPs) evenly distributed on the shell of the hollow structure. A CTL sensor was established for the determination of MSBE based on the specificity of Pt/Au NPs@Co3O4. The experimental results showed that Pt/Au NPs@Co3O4had a strong specific cataluminescence (CTL) response to MSBE, with no interference from MTBE. The linear range was 0.10–90 mg/L, the limit of detection was 0.031 mg/L (S/N= 3), the RSD was 2.5% (n= 9), and a complete sample test could be completed in five minutes. The sensor was used to detect MSBE in MTBE of different purity grades, with recoveries ranging from 92.0% to 109.2%, and the analytical results were consistent with those determined by gas chromatography. These results indicate that the established method was accurate and reliable, and could be used for rapid analysis of MTBE gasoline additive.Keywords:Pt/Au NPs@Co3O4;cataluminescence sensor;methyl sec-butyl ether;methyl tert-butyl ether;rapid analysis;gasoline additive
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高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2020
·
IF 5.627
Yan Zhang,Xiaoyuan Zhang,Chuangchuang Cao,Jiabiao Zou,Tianyu Li,Jiuzhong Yang,Lili Ye,Yuyang Li
This work reports an experimental and kinetic modeling investigation on the flow reactor pyrolysis of iso -butylbenzene and tert -butylbenzene at 0.04 and 1 atm. Pyrolysis products were detected and identified using synchrotron vacuum ultraviolet photoionization mass spectrometry , and their mole fractions versus heating temperature were measured. High-pressure-limit and pressure-dependent rate constants of unimolecular decomposition reactions of iso -butylbenzene were calculated in this work using the same method as the theoretical calculation investigation on similar reactions of n -butylbenzene, sec -butylbenzene and tert -butylbenzene reported by Belisario-Lara et al. [ J. Phys. Chem. A , 122 (2018) 3980–4001]. Furthermore, a pyrolysis model of four butylbenzene isomers was developed from our previous models of n -butylbenzene and sec -butylbenzene and validated by the present experimental data. Modeling analysis was performed to reveal key pathways in fuel decomposition and polycyclic aromatic hydrocarbon (PAH) formation of iso -butylbenzene and tert -butylbenzene. The dominant decomposition reactions of iso -butylbenzene and tert -butylbenzene under pyrolysis conditions are benzylic C C bond dissociation reactions, while the major products in pyrolysis process are produced by β - scission reactions of primary radical products. Fuel-specific pathways are found to strongly affect the formation of PAHs, especially for indene, naphthalene and phenanthrene. Fuel isomeric effects on the pyrolysis of four butylbenzene isomers were also analyzed with special concerns on the fuel decomposition and PAH formation processes. Different sidechain structures result in different distributions of major products, while different formation pathways and concentrations of precursors lead to different formation tendency of typical PAHs.
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高影响因子
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
·
2020
·
IF 2.897
Jiao Yang,Qingyi Huang,Huan Liu,Xiong Zhou,Zhuoquan Huang,Quansheng Peng,Chunhong Liu
Environmental endocrine disruptors 4-nonylphenol (NP) and 4-tert-octylphenol (OP) may cast huge harm to human health. We used a rat model to observe the influence of NP or/and OP exposure on anxiety-related behaviors and the underlying mechanisms. Eighty male Sprague-Dawley (SD) rats were randomly divided into 10 groups: control group (corn oil), NP groups [30, 90, 270 mg/kg], OP groups [40, 120, 360 mg/kg] and NO groups [(mixed with the corresponding NP, OP alone exposed low, medium and high dose according to the natural environment exists NP:OP = 4:1]. The rats were orally administered every other day for 30 days. The neurobehaviors of rats were evaluated by open-field test (OFT) and elevated plus-maze test (EPM), and the concentrations of 5-HT, monoamine oxidase (MAOA), serotonin transporter (SERT), vesicular monoamine transporter 2 (VAMT2), 5-hydroxytryptamine 1A (5-HT 1A ), 5-hydroxytryptamine 2A (5-HT 2A )，and 5-hydroxytryptamine 2C (5-HT 2C ) in the rat prefrontal cortex were analyzed by ELISA . OFT and EPM tests showed that NP or/and OP exposure induced anxiety-related behaviors in rats. 5-HT levels were significantly increased compared with the control group. The levels of MAOA, SERT, VAMT2, 5-HT 1A , 5-HT 2A, and 5-HT 2C in the prefrontal cortex reduced in different degrees by high-doses NP or/and OP exposure. In summary, NP or/and OP exposure might cause anxiety-related behaviors in rats through regulating neurotransmitter 5-HT levels by altering the expression of 5-HT decomposition enzyme MAOA, transporters SERT and VMAT2, and 5-HT receptors 5-HT 1A , 5-HT 2A, and 5-HT 2C .
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PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Cui Ma,Shengyong Jia,Pengfei Yuan,Zhengguang He
Composite magnetic oxide at cow dung ash, nano-Fe 3 O 4 @cow dung ash (nano-Fe 3 O 4 @CDA), was used as catalytic material for the degradation of 2, 2′-methylenebis (4-methyl-6-tert-butylphenol) (AO 2246) in real biologically pretreated landfill leachate . The Fe 3 O 4 @CDA composite exhibited catalytic ozonation activity and allowed material separation and magnetic recovery. The effects of several operating parameters including O 3 concentration, catalyst dosage, temperature and scavengers were evaluated in parallel. Over 70% of AO 2246 were removed by the nano-Fe 3 O 4 @CDA/O 3 system under optimum conditions within 120min reaction time. The EPR, GC–MS and free-radical quenching experiments expatiated the mechanism of this degradation process. It was confirmed that the AO 2246 was degraded efficiently in this catalytic micro-ozonation process, Additionally, GC–MS analysis state clearly that the 3,5-bis(1,1-dimethylethyl)phenol, 4-(1,5-dihydroxy-2,6,6-trimethylcyclohex-2-enyl)but-3-en-2-one, ethanone, 1-(1,4-dimethyl-3-cyclohexen-1-yl)-, 5-tert-butyl-6-3, 5-diene-2-one, 2-hydroxyhexanoic acid, 2-propenoic acid 1,1-dimethylethyl ester, butanoic acid, 2-methyl-, methyl ester and propanoic acid, 2, 2-dimethyl- were the dominant oxidation products (OPs) during the degradation of the AO 2246. The EPR results showed that the catalytic ozonation over Fe 3 O 4 @CDA led to produce more hydroxyl radicals , which were in favor of AO 2246 degradation. The toxicity evolution was also performed through a QSAR analysis calculated by the ECOSAR program which further demonstrated the different responses toward the AO 2246 and its OPs.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Wenhao Xu,Xiaofeng Gao,Xian Zhou,Yongkang Huang,Houhong Song,Siyu Yao
Prins condensation of methyl tert-butyl ether (MTBE) with formaldehyde (FA) is an important route for isoprene synthesis. Traditionally, the production capacity of isoprene in a liquid-phase batch reactor is significantly limited due to the high ratio of MTBE/FA and the addition of an excessive amount of solvent. In this study, we evaluated different acid catalysts aiming at enhancing the selectivity and recyclability of catalysts under the condition of stoichiometric MTBE/FA in a concentrated solution. A Brønsted sulfonic ionic liquid ([HSO3-bmin] PTS) showed remarkable performance. The study of the reaction network confirmed that 4,4-dimethyl-1,3-dioxane (DMD) was the key reaction intermediate for isoprene synthesis. Sufficient acid strength of the ionic liquid catalysts was necessary for the conversion of intermediates to isoprene. The influence of reaction conditions including reaction time, reaction temperature, solvent, SO3H-functionalized ionic liquid (SFIL) concentration, and the amount of MTBE and formaldehyde was investigated in detail to maximize the yield of isoprene. Under the optimal conditions, the capacity of isoprene production reached 55.0 g/L, 1 order higher than that in previous studies. The [HSO3-bmin] PTS ionic liquid exhibited excellent recyclability and maintained its activity and selectivity after being reused seven times.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）