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In situ simultaneous chemical activation and exfoliation of carbon quantum dots for atmospheric adsorption of H2S and CO2 at room temperature
Applied Surface Science ( IF 6.7 ) Pub Date : 2021-04-24 , DOI: 10.1016/j.apsusc.2021.149892
Saeed Fakhraie , Hamid Reza Rajabi , Alimorad Rashidi , Yasin Orooji , Ebrahim Ghasemy , Ali Shayesteh Zeraati , Reza Rahighi , Ahmad Mirhashemi

Herein, novel nitrogen-doped nanoporous carbons possessing 2.63 at.% N and high porosity were prepared using nitrogen-rich carbon quantum dots (N-CQDs) via a facile chemical activation. To this end, after performing the hydrothermal process on the raw materials, chemical activation was carried out by various KOH/N-CQDs ratios (2:1 to –4:1), resulting in unique micro-mesoporous structures (i.e., HNAC samples). In this approach, a large surface area (1477 m2g−1) and pore volume (1.05 cm3g−1) were obtained, where the micropore volume was increased by decreasing the KOH/N-CQDs ratio, activation time and augmenting the activation temperature, that caused considerable adsorption at 1 bar. It is worth mentioning that mesopores could be generated by condition optimization that led to higher adsorption at high pressure. Due to their large surface area and high nitrogen loading, the HNAC samples demonstrated excellent H2S and CO2 adsorption capacity at ambient conditions (9.28 mmolg−1 for H2S and 4.28 mmolg−1 for CO2 at 1 bar and 25 °C) and at higher pressures (18.0 mmolg−1 for H2S and 6.20 mmolg−1 for CO2 at 10 bar and 25 °C). According to the significant performance of the prepared nanosorbents along with stable cyclic adsorption-desorption performance, the HNACs are proposed as promising adsorbents with outstanding adsorption.



中文翻译:

原位同时化学活化和剥落碳量子点,以便在室温下大气吸附H 2 S和CO 2

在此,使用富氮碳量子点(N-CQD),通过容易的化学活化,制备了具有2.63原子%N和高孔隙率的新型氮掺杂纳米多孔碳。为此,在对原材料进行水热处理后,通过各种KOH / N-CQDs比率(2:1至–4:1)进行化学活化,从而产生独特的微中孔结构(即HNAC样品) )。用这种方法,表面积大(1477 m 2 g -1),孔体积大(1.05 cm 3 g -1)),通过降低KOH / N-CQDs比,活化时间和增加活化温度来增加微孔体积,从而在1 bar下引起大量吸附。值得一提的是,通过条件优化可以产生中孔,从而导致高压下的更高吸附。由于其大的表面积和高的氮气负载,在HNAC样品表现出了优异ħ 2 S和CO 2在环境条件下的吸附容量(9.28 mmolg -1用于h 2 S和4.28 mmolg -1为CO 2在1巴和25℃ C)和在较高的压力(18.0 mmolg -1用于h 2 S和6.20 mmolg -1对于10 bar和25°C的CO 2而言)。根据制备的纳米吸附剂的显着性能以及稳定的循环吸附-解吸性能,提出了将HNACs作为具有良好吸附性能的有前途的吸附剂。

更新日期:2021-05-07
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