NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·3038-3044
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IF 3.288
Xu Wang,Zhiwei Sun,Xianzhu Luo,Kaifeng Wang,Shijuan Zhang,Zhongyin Ji,Yue Gao,Jinmao You
A novel switchable solvent liquid-phase microextraction technique, based on the solidification of floating organic droplets (SS-LPME-SFO), was developed for the pretreatment of aqueous samples. In this process, octanoic acid was selected as the extractant due to its low density, moderate melting point, and ability to switch between hydrophilic and hydrophobic characteristics. This technique has been successfully applied in the enrichment of five polycyclic aromatic hydrocarbon monohydroxy metabolites (OH-PAHs) in urine samples. Furthermore, a HPLC-FLD detection procedure was established to analyze the samples. A series of parameters affecting the extraction were systematically studied. Under the optimal conditions, all analytes showed good linearity within the studied range, and the values of the correlation coefficient (R2) were higher than 0.99. The limits of detection (LODs) and the limits of quantitation (LOQs) were within the range of 0.018–0.076 μg L−1 and 0.059–0.25 μg L−1, respectively. The method also achieved good recoveries, ranging between 88.5% and 102.5%. Overall, the method is highly cost-effective, environmentally-friendly, fast and efficient. This study proposes an efficient extraction method for the analysis of most organic pollutants in complex environmental aqueous phases.
研究领域:
分析化学
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环境科学
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医学检测
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 18
·2300036
·
IF 2.5
Wei Zhang,Yi Sun,Yiting Xu,Xiaobo Yu,Yajin Fang,Fei Liu,Haining Na,Jin Zhu
Fabrication of fluorescent cellulose with aggregation-induced emission (AIE) characteristics is usually achieved by grafting tetraphenylethylene (TPE) to the cellulose backbone using TPE derivatives with highly active functional groups such as carboxylic, isothiocyanate, and alkynyl groups. However, besides the complicated synthetic routes of these TPE derivatives, conversion of hydroxyl groups in the cellulose chain to more reactive groups such as amine or azide groups is usually involved, and the resulting products have a degree of substitution (DS) of TPE lower than 0.08. Herein, a facile one-pot strategy for the grafting of a TPE group to the cellulose backbone with high DS of up to 0.22 in a CO 2 switchable solvent under mild reaction conditions is reported. The hydroxyl groups in the cellulose are in situ converted to cellulose carbonate intermediately during the dissolution step. Subsequently, nucleophilic substitution between the intermediate and a halogenated TPE derivative with bromine atom as leaving group is carried out to achieve the effective grafting of TPE. The synthetic route for this promising TPE derivative is much more convenient than those of TPE derivatives reported in previous studies. This work suggests a new and facile pathway for the synthesis of high-emission fluorescent cellulose with AIE functionality.
研究领域:
材料科学
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化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Jinling Li,Shan Lu,Fei Liu,Qian Qiao,Haining Na,Jin Zhu
Development of an effective, nontoxic, and easy-to-process novel cellulose dissolution system for the preparation of regenerated cellulose fibers is of great importance and necessity for a greener and more sustainable future, with which the traditional viscose process with serious pollution can be gradually substituted. Herein, we demonstrated the successful utilization of a CO2 switchable solvent, a novel cellulose derivative dissolution system resembling viscose but without releasing toxic gases such as CS2 and H2S, for the preparation of regenerated cellulose fibers. The corncob cellulose raw material can be readily dissolved completely after the capture of CO2 in dimethyl sulfoxide (DMSO) with 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU), resulting in cellulose spinning dope with high stability. Results showed that regenerated cellulose fibers with smoother surface morphology, a higher degree of crystallinity, and satisfactory mechanical properties were obtained under mild conditions with relatively slower double diffusion. Moreover, drawing treatment further increased the degree of crystallinity and orientation and the mechanical properties. All fibers had a dense structure, circular cross sections, no fibrillation, and high thermal stability. The regenerated cellulose fibers had degrees of crystallinity and orientation and tensile strength of 75.3%, 0.82, and 1.05 cN/dtex and 68.4%, 0.82, and 1.00 cN/dtex, respectively, in water and 30 vol % DMSO coagulation baths with a drawing ratio of 2.0 and 1.5, respectively. This work illustrated that the CO2 switchable solvent, which could be considered as “green viscose”, is a good candidate with great potential for the preparation of regenerated cellulose fibers with high performance and various functionalities in the future.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 12
·6745-6758
·
IF 6.123
Zhang Jinyang,Mi Shu,Liu Fei,Qiao Qian,Na Haining,Zhu Jin
Organic solvents with low Henry's constants, such as propylene carbonate (PC) and sulfolane, were proposed to be used as CO 2 absorbents to increase CO 2 absorption capacity in the CO 2 switchable solvent, so that the dissolution of cellulose can be effectively enhanced. With the addition of PC, the maximum concentration achieved for the dissolution of paper cellulose can be largely increased from 1.0 to 5.0 wt%, while those for microcrystalline cellulose and corncob cellulose were increased from 5.0 to 10.0 and 7.0 wt%, respectively. Moreover, the chemical and crystalline structure of the regenerated cellulose was not affected by the addition of CO 2 absorbents. This study illustrated a simple and effective way to modify the CO 2 switchable solvent, which would be helpful for the application of the complex solvent system for the enhanced dissolution, derivatization, and processing of cellulose in the future.
研究领域:
化学工程
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材料科学
✓ 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）