CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Yangqi Gan,Gui Chen,Yafei Sang,Fa Zhou,Ruilin Man,Jianhan Huang
Herein oxygen-rich hyper-cross-linked polymers with hierarchical porosity were developed via two continuous Friedel-Crafts reactions. Their aniline adsorption was evaluated from aqueous solution. It indicated that the first Friedel-Crafts reaction introduced plentiful oxygen (O) on the polymers with the O content of 12.53 wt%. The second Friedel-Crafts reaction produced predominated micropores with micropore area over the Brunauer-Emmett-Teller (BET) surface area of 56.8%, the hierarchical porosity including micropores, mesopores, and macropores were characteristic for the as-fabricated polymers. The aniline adsorption was largely improved on the synthesized polymers, in which the maximum capacity was 178.4 mg/g at 303 K as the introduced O and the manufactured micropores were greatly beneficial for the adsorption. The Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy demonstrated that the introduced O as a functional of the C O, C O, and O H groups strongly interacted with aniline. More importantly, 80 min was sufficient to reach the equilibrium, 0.6 g the polymers made the aniline solution (<40 mg/L) meet the discharge requirement of Chinese environmental protection authorities (<5 mg/L).
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 136
·期 27
·47716
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IF 2.188
Fenghao Guo,Yinping Wang,Xilu Chen,Mingqian Chen,Wei He,Zhiyong Chen
Cryogels are supermacroporous but restricted by lack of surface area in utilization to date. We here propose a method for fabrication of supermacroporous polydivinylbenzene (PDVB) cryogels with high surface area by redox-initiated cryopolymerization combined with solvothermal postcrosslinking technique. The PDVB precursor cryogels are prepared by redox-initiated cryopolymerization, followed by postcrosslinking of residual double bonds to form hypercrosslinked cryogels under solvothermal conditions. The hypercrosslinked cryogels maintain the original supermacroporosity and display very high surface area up to 1462 m 2 g −1 . We demonstrate the utilization of the resultant cryogel in uptake of carbon dioxide (7.9 wt % at 1 bar and 62.2 wt % at 25 bar, respectively) and uptake of aniline (333.3 mg g −1 at room temperature) from aqueous solutions. The adsorption behaviors of aniline on the hypercrosslinked cryogels are found to follow Langmuir model as well as Freundlich model in equilibrium adsorption and to follow pseudo-second-order model in kinetic adsorption, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47716.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Rui Yu,Xing Li,Yanling Yang,Tingting Zhang,Zhiwei Zhou
The adsorption characteristics of dissolved aniline onto powdered activated carbon (PAC) and the subsequent desorption by ultrasound treatment were studied. The results indicated that the adsorption followed the pseudo-second-order model and the Langmuir model. Acidic conditions were not conducive to the adsorption of aniline. The desorption efficiency of saturated PAC radiated by ultrasound reached a maximum of 24.35% with a sonication power of 180 W at a frequency of 40 kHz, and a pH of 3 within 180 min of sonication time. The addition of ethanol produced a synergistic effect with ultrasound, effectively improved the desorption efficiency to 83.88%. Intermediates of aniline that were formed during the ultrasound irradiation were analyzed by gas chromatography-mass spectrometry and this identified azobenzene as the main by-product. Analysis of the specific surface area, pore structure, and FTIR spectra of PAC indicated that more cavitation occurred in ethanol than in water, and high-speed microjets and high-pressure microstreams enlarged the mesopore of PAC. In general, the physical attack of microjets and microstreams played an active role in the desorption of aniline.
研究领域:
环境科学
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水处理技术
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物理化学
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环境污染控制
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吸附与脱附机制
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Xiaomei Wang,Xiaomi Yuan,Fa Zhou,Jianhan Huang
Functionalized hyper-cross-linked polymers with special functional groups are anticipated for fast and efficient removal of aniline from aqueous solution. Herein, sequential four chemical reactions namely polymerization, Friedel–Crafts reaction, amination reaction, and carboxylation reaction were performed and carboxyl functionalized hyper-cross-linked dendrimers with highly branched structure and multiple functional groups were fabricated. The introduced carboxyl, amino, and amido groups on the polymers exhibit strong affinity to aniline through acid-base interaction, electrostatic interaction, and hydrogen bonding, which are helpful for the equilibrium adsorption of aniline. Importantly, these polymers owned hierarchical microporous and mesoporous structure, which is beneficial for the fast adsorption of aniline. These polymers were efficient for aniline adsorption with a maximum capacity of 163.0 mg/g and the adsorption was an exothermic, spontaneous, and ordered process. The adsorption was a fast process and less than 10 min was required to reach the equilibrium. The present study gives a simple strategy for the synthesis of carboxyl functionalized hyper-cross-linked dendrimers, which is of great significance for the fast and efficient adsorption of aniline from aqueous solution.
研究领域:
环境化学
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高分子科学
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吸附分离
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功能材料
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水处理技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）