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CARBON · 2012 ·Vol. 50 ·期 8 ·2810-2815 · IF 5.378

Polyamine-functionalized carbon quantum dots for chemical sensing

Yongqiang Dong,Ruixue Wang,Hao Li,Jingwei Shao,Yuwu Chi,Xiaomei Lin,Guonan Chen

Polyamine-functionalized carbon quantum dots (CQDs) with high fluorescence quantum yield (42.5%) have been synthesized by the low temperature (<200 °C) carbonization of citric acid with branched polyethylenimine (BPEI) in one simple step. The obtained BPEI–CQDs are spherical graphite nanocrystals (average 6.2 nm in size) capped with abundant BPEI at their surfaces. It is the first report that CQDs are both amino-functionalized and highly fluorescent, which suggests their promising applications in chemical sensing.

研究领域: 分析化学 · 纳米材料 · 生物传感 · 荧光成像 · 分子探针

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JOURNAL OF APPLIED POLYMER SCIENCE · 2017 ·Vol. 134 ·期 28 ·45046 · IF 1.86

Synthesis and CO2 adsorption behavior of amine-functionalized porous polystyrene adsorbent

Fenglei Liu,Shuixia Chen,Yanting Gao,Yufang Xie

A solid amine adsorbent was prepared by modifying a porous polystyrene resin (XAD-4) with chloroacetyl chloride through a Friedel–Crafts acylation reaction, followed by aminating with tetraethylenepentamine (TEPA). The adsorption behavior of CO 2 from a simulated flue gas on the solid amine adsorbent was evaluated. Factors that could determine the CO 2 adsorption performance of the adsorbents such as amine species, adsorption temperature, and moisture were investigated. The experimental results showed that the solid amine adsorbent modified with TEPA (XAD-4-TEPA), which had a longer chain, showed an amine efficiency superior to the other two amine species with shorter chains. The CO 2 adsorption capacity decreased obviously as the temperature increased because the reaction between CO 2 and amine groups was an exothermic reaction, and its adsorption amount reached 1.7 mmol/g at 10 °C in dry conditions. The existence of water could significantly increase the CO 2 adsorption amount of the adsorbent by promoting the chemical adsorption of CO 2 on XAD-4-TEPA. The adsorbent kept almost the same adsorption amount after 10 cycles of adsorption–desorption. All of these results indicated that amine-functionalized XAD-4 resin was a promising CO 2 adsorbent. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45046.

研究领域: 环境化学 · 高分子材料科学 · 气体吸附与分离 · 碳捕集技术

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Polyamine-functionalized carbon quantum dots for chemical sensing

Synthesis and CO2 adsorption behavior of amine-functionalized porous polystyrene adsorbent