JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 31
·14756-14771
·
IF 4.682
Cai Menglu,Wang Xiaozhong,Cao Wenhui,Chen Yingqi,Dai Liyan
A fine-tuned mordenite was prepared to overcome the low selectivity of tert-amyl anthracene production in the direct alkylation of anthracene. Herein, a series of boric acid-modified Fe-Zr mordenite materials were prepared, and tert-amyl anthracene was smoothly and efficiently obtained over these catalysts. The boron sites in modified catalyst promoted the alcohol dehydrogenation, which benefited the reaction conversion. Moreover, the existence of Brønsted and Lewis acid sites was the key in alkylation reaction, making 1.0B-Fe-Zr/MOR good reactivity (Conv. 47.8%, Sel. 91.4%). Calculated results correlated the products properties with catalyst structures, verifying that boric acid-modified Fe-Zr/MOR was a successful shape-selective catalyst. The present work opens a new frontier for a sustainable and high-selective method to process anthracene alkylation. Graphical abstract
研究领域:
催化化学
·
材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Guiru Ding,Xudong Liu,Weidong Yu,Yan Bing,Ning Sun,Hongji Jiang
To investigate the effects of trifluoromethyl and tert -butyl moieties on the general optoelectronic properties of star-shaped hosts based on phenyls substituted carbazole, we used 3,6,9-tris (4-( tert -butyl)-phenyl)-9 H -carbazole ( M1 ) as a reference, and different numbers of electron-withdrawing 3,5-bis(trifluoromethyl) benzene were introduced into 3, 6 and 9 positions of carbazole to obtain compounds 9-(3,5-bis(trifluoromethyl)phenyl)-3,6-bis(4-( tert -butyl)phenyl)-9 H -carbazole ( M3) , 3,6-bis(3,5-bis(trifluoromethyl)phenyl)-9-(4-( tert -butyl)phenyl)-9 H -carbazole ( M5) and 3,6,9-tris(3,5-bis(trifluoromethyl)phenyl)-9 H -carbazole ( M6) . After the introduction of 3,5-bis (trifluoromethyl) benzene, the thermal temperature at 5 % mass loss of M3 , M5 and M6 decreased to 344 °C, while the glass transition temperature and melting point of M3 and M5 showed a significant increase. However, M6 did not show obvious glass transition, but its melting point also showed a significant increase. M3 crystallized at 125 °C as evidenced by differential scanning calorimetry, and the linking model of M3 is helpful to crystalize. In addition, when compared with those of M1 , the fluorescence emission peaks of M3 and M6 showed a blue-shift, while M5 showed a red-shift, all of which were in the deep blue emission range. The color purity of blue light for M1 in tetrahydrofuran solution is the highest, and M1 exhibit aggregation-induced emission characteristics. Compared to the photoluminescence quantum efficiency (PLQY) of compound M1 of 39 % in toluene, the PLQYs of M3 and M6 decreased to 34 % and 29 %, and the PLQY of M5 increased to 46 %. The function of the lowest unoccupied molecular orbital trap of M3 film under the external electrical field will increase, which not only offsets the increasing effect of the electrical field to the electron carrier and further decreases the carrier mobility when the electrical field increase, and the same situation is also feasible for the highest occupied molecular orbital traps in M5 , M6 and M1 . The organic blue light emitting diodes were prepared by using M1 , M3 , M5 and M6 as the hosts of bis [2-(4,6-difluorophenyl)pyridinato-C 2 ,N](picolinato)iridium, and the optimized device of M1 as the host showed the best performance with a maximum luminescence brightness of 2978 cd/m 2 , maximum current efficiency of 39.42 cd/A and maximum external quantum efficiency of 18.36 %.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Mengqi Xu,Yaxing Yu,Jun Li,Yanlan Bi,Jun Liu,Chenyu Fu
A comprehensively antioxidative mechanism was systematically investigated for tert-butylhydroquinone (TBHQ) in edible oils during storage. Three key aspects were elucidated to demonstrate how TBHQ retains its antioxidative activity: (1) the molecular advantages of TBHQ compared to other synthetic phenolic antioxidants; (2) the antioxidative performance of tert-butylbenzoquinone (TBBQ), TBHQ's main transformation product, which demonstrated the ability to be reduced back to TBHQ in both free radical and pure triglyceride systems; and (3) the identification and verification of two additional phenolic transformation products 2-methylallyl-hydroquinone (MAHQ) and 2,2-dimethyl-2,3-dihydrobenzofuran-5-ol from various edible oils using GC–MS and NMR techniques. MAHQ showed antioxidative activity similar to TBHQ, while the monophenolic product was hypothesized to possess antioxidative properties. These findings reveal that TBHQ's retained antioxidative activity during oil storage is through both its molecular advantages and the antioxidative properties of its transformation products, providing theoretical support for TBHQ applications in the food industry.
研究领域:
食品化学
·
分析化学
·
食品科学
·
有机化学
·
抗氧化机制
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Bo Peng,Xueyan He,Chunjuan Wang,Fengxiang Du,Min Zhou,Shengguo Zhao,Yanjun Fang
A novel ratiometric fluorescent probe based on non-conjugated polymer dots (NCPDs) and gold nanocluster (AuNCs) was constructed to determine tert -butylhydroquinone (TBHQ). The probe exhibited dual emission peaks at 480 nm and 630 nm under 370 nm excitation. The fluorescence of AuNCs was quenched by TBHQ due to strong electrostatic interactions, whereas the emission of NCPDs increased. The ratio of fluorescence intensity at 480 nm to 630 nm (F 480 / F 630 ) was monitored as analytical signal response. The probe have been utilized for the detection of TBHQ with good linear relationship in the range of 0.2 to 60 μg/mL. The limit of detection (LOD) and the limit of quantitation (LOQ) were 0.048 μg/mL and 0.159 μg/L, respectively. Three levels of spiked-in TBHQ concentrations were obtained with recovery rates from 80 % to 102 %. The present study provided an effective ratiometric fluorescence method for selective screening of TBHQ in food samples.
研究领域:
分析化学
·
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shuai Liu,Hao Qu,Yu Mao,Lili Yao,Ling Yan,Baolei Dong,Lei Zheng
Tert -butyl hydroquinone (TBHQ) stand as one of the most widely used antioxidants in food and daily chemical products. Rapid and sensitive monitoring of TBHQ holds considerable importance in safeguarding human health due to its potential risks. In this study, we devised an alcogel-based colorimetric sensor enabling the portable and visual detection of TBHQ. The Ce-UiO-66 nanozyme exhibiting remarkable oxidase-like activity, was synthesized and characterized, facilitating the catalysis of TBHQ oxidation to 2- tert -butyl-1,4-benzoquinone (TBBQ). The ensuing chromogenic reaction between TBBQ and ethylenediamine produced a stable and colored product, serving as a reliable indicator for the rapid and specific detection of TBHQ. Building upon this discovery, a portable and low-cost colorimetric sensor was fashioned by integrating the nanozyme into κ -carrageenan alcogel, thereby enabling on-site TBHQ detection via a smartphone-based sensing platform. The colorimetric sensor exhibited a detection limit of 0.8 μg mL –1 , demonstrating robust performance across various matrices such as edible oils, cosmetics, and surface water. Recoveries ranged from 84.9 to 95.5%, with the sensor’s accuracy further validated through gas chromatography-mass spectrometry. Our study presents an effective approach to rapid and convenient monitoring of TBHQ, exhibiting good extensibility and practicability.
研究领域:
分析化学
·
食品科学
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Gao Hongfeng,Lin Xiongchao,Tao Xianfeng,Zhang Xuchun,Wang Caihong,Bai Hongcun,Wang Yonggang
A novel method for enhancing oxidative stabilization through the addition of p-tert-butylphenol (TOH) to the as-prepared pitching process was developed. TOH can be used as a radical initiator to quickly and uniformly stabilize the pitch. The properties of spinnable pitches, the effects of oxidation stabilization, and the polymerization mechanism were thoroughly elucidated. The findings revealed that the introduction of TOH led to an increase in the fraction of aliphatic structures as well as the oxygen content within the pitches. This increase facilitated the formation of oxygen-containing groups and promoted crosslinking reactions among the pitch molecules. Notably, the hydrogen in the OH group of TOH displays high reactivity, readily engaging in cross-linking reactions with the benzyl radicals in halogenated polycyclic aromatic hydrocarbons (PAHs-X) during heat treatment. Consequently, an ether bond is formed between the benzyl radical in PAHs-X and the hydroxyl radical in TOH. High temperatures could expedite the formation of aryl ester functional groups in an inert gas atmosphere and hasten the crosslinking of PAHs molecules, resulting in the formation of a macromolecular structure with a certain degree of polymerization. This modification method is expected to provide a new approach for expediting oxidative stabilization.
研究领域:
材料科学
·
高分子化学
·
碳材料
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2011
·Vol. 29
·期 10
·2197-2201
·
IF 0.773
Chenyi Wang,Xiaoyan Zhao,Guang Li,Jianming Jiang
A series of novel polyamides 3a – 3d containing 4- tert- butyltoluene moiety, were prepared using the phosphorylation polycondensation technique. FT-IR and 1 H NMR techniques were used to investigate the chemical structures of 3a–3d . The results confirmed that they agreed with the proposed structures for 3a – 3d completely. The 3a – 3d had inherent viscosities ranging from 0.71 to 1.67 dL·g −1 . All the polyamides showed excellent solubility, with the dissolvability at a concentration of 10 wt% in most amide polar solvents. Flexible and tough polyamide films could be prepared by casting from DMAc ( N , N -dimethylacetamide) solvent. Their films were nearly colorless and exhibited high optical transparency, with the UV cutoff wavelength in the range of 346–363 nm and transmittance higher than 80% at 450 nm. They also exhibited high glass transition temperatures in the range of 310–343°C and the onset decomposition temperatures in the range of 435–462°C in nitrogen atmosphere. Meanwhile, these polyamide films possess good mechanical properties with tensile strengths of 76.4–86.1 MPa and elongations at break of 11.2%–27.3%. Due to those properties, these polyamides could be considered as photoelectric and microelectronic materials.
✓ 已验证
DOI
高影响因子
Green Processing and Synthesis
·
2021
·Vol. 10
·期 1
·874-881
·
IF 2.83
Xin Zhou,Ge Gao,Guangxiang He,Xiaoyan Guo,Haibo Jin,Lei Ma
The side-chain alkylation of cumene and ethylene over a solid superbase catalyst K/KOH/ γ -Al 2 O 3 is investigated. The effects of the reaction temperature, pressure, and time on the conversion of cumene and selectivity of tert -amylbenzene (TAB) are discussed. The experimental results show that the conversion of cumene to tert -pentylbenzene increases with the increase in reaction temperature and ethylene pressure. The catalytic reaction has certain operational flexibility in terms of the reaction temperature, pressure, and time. In addition, the catalytic reaction can achieve directional conversion. The optimum operating conditions are obtained using a single factor test. The conversion of cumene is 99.8% and the selectivity toward TAB is 97.9% under catalyst concentration of 4 wt%, reaction temperature of 55°C, reaction pressure of 0.45 MPa, and reaction time of 30 min. The deactivation of catalyst is mainly caused by oxygen and water in the raw material.
研究领域:
催化化学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 5
·2764-2771
·
IF 3.049
Fuhang Mai,Kai Cui,Zhe Wen,Kai Wu,Fei Yan,Mengmeng Chen,Hong Chen,Yongdan Li
The conversion of guaiacol is examined at 300 °C in supercritical ethanol over a H2WO4 catalyst. Guaiacol is consumed completely, meanwhile, 16.7% aromatic ethers and 80.0% alkylphenols are obtained. Interestingly, tert-butylphenols are produced mainly with a high selectivity of 71.8%, and the overall selectivity of 2,6-di-tert-butylphenol and 2,6-di-tert-butyl-4-ethylphenol is as high as 63.7%. The experimental results indicate that catechol and 2-ethoxyphenol are the intermediates. Meanwhile, the WO3 sites play an important role in the conversion of guaiacol and the Brønsted acid sites on H2WO4 enhance the conversion and favour a high selectivity of the tert-butylphenols. The recycling tests show that the carbon deposition on the catalyst surface, the dehydration and partial reduction of the catalyst itself are responsible for the decay of the H2WO4 catalyst. Finally, the possible reaction pathways proposed involve the transetherification process and the alkylation process during guaiacol conversion.
研究领域:
化学工程
·
催化
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Cuicui Wang,Jierong Zheng,Sufang Wang,Aijuan Zhou,Xin Kong,Bowei Zhao,Houfen Li,Xiuping Yue
The investigation into the degradation of alkylphenol pollutants (APs) has become a hotspot due to their harmful effects on the environment and human health. In this study, microbial electrolysis cells (MECs) were used to degrade nonylphenol (NP) and 4- tert -octylphenol (4- tert -OP). The study found that the degradation rates of NP and 4- tert -OP for a 6-day period were 83.6% and 96.3%, respectively, which were 30.53% and 26.7% higher than those of the group without applied voltage. The double layer area in the degradation of 4- tert -OP was larger than that of NP, and the resistance exhibited by 4- tert -OP (87.47 Ω) in MEC was lower than that of NP (99.42 Ω). Meanwhile, NP had a greater effect on the bioenzyme activity than 4- tert -OP. GC-MS analysis showed that the degradation pathways of both pollutants mainly included oxidation and hydroxylation reactions. Furthermore, the microbial community analysis indicated that the main functional bacteria in NP degradation were Citrobacter , Desulfovibrio and Advenella , and those in 4- tert -OP degradation were Stenotrophomonas , Chryseobacterium , Dokdonella , and the key microbiomes underlying the cooperative relationship. The biotoxicity test indicated that the toxicity of residual substances was significantly reduced. Therefore, the MEC system is efficient and environmentally friendly and has broad application prospects in phenol refractory organics.
研究领域:
环境科学
·
微生物学
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2023
·
IF 5.7
Miao Fei,Lei Ni,Tianyi Yan,Juncheng Jiang,Hang Yao,Han Zhang,Chenwei Dai
Background The synthesis of tert-butyl hydrogen peroxide (TBHP) is a two-step strong exothermic reaction. In this paper, the exothermic and mechanism of the reaction process were studied by combining experiments with theoretical calculation. Method The exothermic characteristic for the synthesis of tert-butyl hydrogen peroxide was investigated by reaction calorimeter. The thermal decomposition characteristics of reactants and products in the reaction system were analyzed by differential scanning calorimeter (DSC) and adiabatic calorimeter (Phi-TEC Ⅱ). The reaction mechanism was analyzed by combining the results of reaction calorimeter, gas chromatography (GC) and the density functional theory method (DFT). Finally, the risk level of the reaction process was evaluated by the risk matric and the Stoessel critical diagram. Significant Findings TBHP is the main product of the oxidation process and its mass production corresponds to the main exothermic stage of this process. The second step reaction product is thermally unstable and hydrogen peroxide is a hidden danger in the oxidation reaction system. The thermal hazard of the two-step synthesis reaction was unacceptable. Thus, the operation conditions of the reaction need to redesign for reducing hazards. The results can provide reference for further improving the intrinsic safety design of the process.
研究领域:
化学工程
·
过程安全
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 6
·1002
·
IF 3.9
Qi Wu,Dejin Zhang,Shu Sun,Chengcheng Liu,Cong Wang
The synthesis 2-tert-butyl-4-methylphenol is of great significance because of its wide application in industry, and the development of a highly efficient catalyst is necessary for the alkylation of p-cresol and tert-butyl alcohol. Here, an efficient and mild method was established. Caprolactam was chosen as the hydrogen-bonding acceptor; p-toluenesulfonic acid was employed as the hydrogen-bonding donor, and a deep eutectic solvent (DES) was prepared to catalyze the alkylation reaction. The structure of the deep eutectic solvent catalyst was characterized by1H NMR spectra, thermogravimetric analysis, and Fourier transform infrared spectra (FT-IR). In addition, response surface design based on the Box–Behnken method was employed to optimize the alkylation reaction process parameters, and the study of reaction kinetics was also carried out subsequently. The recycle performance of the catalyst was evaluated by recovery experiments, and a good result was obtained. By drawing comparisons with the literature reported, we provide a mild method for the synthesis of 2-tert-butyl-4-methylphenol.
研究领域:
化学工程
·
催化化学
✓ 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）