CHROMATOGRAPHIA
·
2021
·Vol. 84
·期 4
·325-333
·
IF 2.044
Shuai Xiaomin,Cai Zhiqiang,Zhao Xinyu,Chen Yujie,Zhang Qian,Ma Ziwei,Hu Junjie,Sun Tao,Hu Shaoqiang
In this work, a novel calix[4]resorcinarene-based ionic liquid (C4RA-2IL) was synthesized, structurally characterized, and statically coated on capillary column as stationary phase for capillary gas chromatography (GC). The column efficiency of the C4RA-2IL column is 3345 plates m −1 , which are determined by n -dodecane at 120 °C. Based on its McReynolds constants, the C4RA-2IL column showed moderate polarity. Particularly, the C4RA-2IL column show high separation performance for a wide range of analytes and some difficult separation of meta/para-isomers. Moreover, it exhibited excellent selectivity for critical aromatic isomers of chloroaniline, bromaniline, iodoaniline, toluidine and xylidine isomers and shows advantageous separation capability over the commercial polysiloxane stationary phase. This work presents a promising future of calixarene-based ionic liquid as a new type of stationary phase in GC separations.
研究领域:
分析化学
·
色谱技术
✓ 已验证
DOI
高影响因子
CHINESE SCIENCE BULLETIN
·
2014
·Vol. 59
·期 11
·1097-1103
·
IF 1.365
Liu Juan,Liu Zhengping,Wang Liyuan,Sun Haiyan
Calix[4]resorcinarene, prepared by the acid-catalyzed condensation of resorcinol and paraldehyde, was used as the core of the molecular glass compound. The hydroxyl groups of calix[4]resorcinarene were partly protected by tert-butoxycarbonyl ( t -BOC) and then esterified with 2-diazo-1-naphthoquinone-4-sulfonyl chloride (2,1,4-DNQ-Cl). Upon irradiation to 365 nm light, the 2,1,4-DNQ groups undergo photolysis to generate a small quantity of sulfonic acid other than indene carboxylic acid. The generated sulfonic acid can further catalyze the deprotection of the t -BOC group. So, a new type of single-component chemically amplified i-line positive photoresist can be formed by the molecular glass compounds. The lithographic performance of the resist was evaluated with high resolution and photosensitivity with an i-line stepper.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Hang Xu,Shaokang Wang,Fengmin Wu,Qinlin Yuan,Yafei Guo,Yinke Zhang,Xuefeng Wei,Jun Zhang
One of the disadvantages of using inorganic solid catalysts is the formation of solid waste. The use of fully-organic solid catalysts can reduce secondary pollution by simple combustion or bio-degradation. Here, an organic polymerization carrier, calix[4]resorcinarene, with polyhydroxyl characteristics, was synthesized. A cobalt containing ionic liquid was successfully chemically bonded to the hydroxyl groups on the carrier surface using 3-chloropropyltrimethoxysilane as linking agent. The resulting fully-organic supported ionic liquid catalyst was coupled with oxone for desulfurization. The micro-structure of the catalyst was composed of a porous spatial network structure. The reaction system exhibited excellent dibenzothiophene (DBT) removal (93.3%) after 90 min under the optimum experimental conditions (20 °C, 6 g of model oil with an initial sulfur content of 1000 ppm, 0.2 g of 20 wt% oxone solution with a dosage frequency of three, 15% of CoCl 2 , 0.15 g of catalyst, and 2 g of [Bmim]BF 4 ). After six regeneration cycles, the sulfur removal remained above 90%. The desulfurization kinetics and mechanism were also discussed, and it was found that the hyperbolic model provided a better fit to the experimental data compared to the pseudo first-order model. The likely mechanism involves DBT being extracted using the ionic liquid [Bmim]BF 4 before being oxidized by the catalyst/oxone system to form DBTO 2 , which is easily removed from the system using polar solvents.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Bin Du,Haoran Ye,Yincheng Wang,Ming Shen,Hui Zhou
The limited optical adsorption range and rapid recombination of photoexcited electron-hole pairs have severely hindered the development of ZnO-based photocatalysts . As macromolecular compounds, calixarenes become potential photocatalyst modifiers owing to their special molecular structures. In this work, ZnFe 2 O 4 /ZnO heterojunction photocatalysts which consist of ZnFe 2 O 4 nanoparticles and ZnO nanosheets were fabricated by simple hydrothermal reaction with the introduction of tetrasulfonatomethyl-n-hexyl calix[4]resorcinarene tetrasodium (THCRT 1 ). The synthesized ZnFe 2 O 4 /ZnO nanocomposite possesses a larger specific surface area , broader-spectrum absorption and an electronegative surface due to the addition of THCRT. Furthermore, the successful construction of ZnFe 2 O 4 /ZnO heterojunction leads to low charge transfer resistance and enhanced photocurrent density. Therefore, the THCRT-capped ZnFe 2 O 4 /ZnO composite exhibited superior adsorptive performance and removal efficiency towards Rhodamine B (RhB) and Levofloxacin hydrochloride (LH). The calcined nanocomposite degraded 95.80 % of RhB (10 mg L −1 ) and 97.86 % of LH (20 mg L −1 ) after 120 min under simulated sunlight illumination at a minimal catalyst dosage of 0 .1 g L −1 . Additionally, to determine the band structures , the band gaps, valence band positions and the Fermi levels were measured by Tauc plot, valence band x-ray photoelectron spectroscopy (XPS-Vb) and Mott-Schottky plot, respectively. Finally, based on the band structure results, we proposed a potential photocatalytic mechanism of n-n heterojunction. This work offers a promising prospect in the treatment of sewage containing organic contaminants.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Wansheng Zong,Lixin Wang,Qing Guo,Juan Li,Wenbo Wu,Yingliang Liu,Shengang Xu,Shaokui Cao
A hyper-structured molecule (HSM) CRA-DR1 and a model molecule Ph-DR1 for photorefractive (PR) application under non-electric field were designed and synthesized via highly reactive “click” reaction between alkynyl derivatives of calix [4]resorcinarene (CRA) or resorcinol and an azide derivative of disperse red 1 (DR1) in satisfactory yields. XRD pattern and UV–Vis absorption spectra indicated that the CRA-DR1 with three-dimensional (3D) CRA core could effectively decrease the aggregation, packing and crystallization of the nonlinear optical (NLO) chromophores . AFM images showed a smooth and pinhole-free morphology of the CRA-DR1 film. Two-beam coupling (TBC) experiment was used to test the photorefractive performance in optically transparent films of Ph-DR1 and CRA-DR1 doped with [6,6]-phenyl-C 61 -butyric acid methyl ester (PCBM) as a photosensitizer and N -ethyl-carbazole (ECz) as a plasticizer . Without poling and without external electric filed, the coupling gain coefficient obtained in the CRA-DR1-based composite is 147.4 cm −1 , which is higher than that of Ph-DR1-based composite (132.6 cm −1 ) owing to its asymmetrical 3D CRA core. Coupled with its convenient synthesis and commercial DR1, CRA-DR1 could serve as a good candidate for PR application.
研究领域:
材料科学
·
光学
·
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）