Green Carbon Material for Organic Contaminants Adsorption
Green Carbon Material for Organic Contaminants Adsorption
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用于有机污染物吸附的绿色碳材料
DOI：
10.1021/acs.langmuir.9b03811
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发表时间：
2020-03-31
期刊：
影响因子：
3.9
通讯作者：
Wang, Dihua
中科院分区：
文献类型：
--
作者：
Jiang, Da;Yang, Juan;Wang, Dihua
生态友好且经济的吸附剂是去除环境中有机污染物的理想选择。本文通过在熔融碳酸盐中电化学转化温室气体（CO2）制备的一种绿色碳材料电解碳（EC）被证实是苯胺和其他芳香族有机小分子的有效吸附剂。 EC由纳米粒子和纳米片组成，比表面积接近641 m(2)/g，具有丰富的微孔结构。它对苯胺具有很大的吸附能力（Q(max) > 114.1 mg/g），特别是在污染程度较低的水中。在303-323 K温度范围内，吸附动力学符合准二阶方程，热力学符合Freundlich模型。此外，发现通过简单的热处理减少表面氧官能团，可以进一步提高材料的吸附性能。其对苯胺的吸附能力提高了1.7倍，表明pi-pi色散相互作用在高效吸附中起主要作用。碳材料对其他类似芳香族化合物（苯酚、硝基苯）的优异吸附性能进一步证实了这种吸附机制。 CO2衍生的碳吸附剂的超强性能将有助于捕获CO2以及去除有机污染物。
Eco-friendly and economical adsorbents are desirable for removing organic pollutants from the environment. Herein, a kind of green carbon material, electrolytic carbon (EC) prepared by the electrochemical conversion of greenhouse gas (CO2) in molten carbonate, is verified as an effective adsorbent for aniline and other small aromatic organic molecules. The EC consists of nanoparticles and nanoflakes, featuring the specific surface area of similar to 641 m(2)/g with an enriched micropore structure. It exhibits a large adsorption capacity (Q(max) > 114.1 mg/g) for aniline, especially in water with a lower contamination level. The adsorption conforms to the pseudo-second-order equation kinetically and the Freundlich model thermodynamically in the temperature range of 303-323 K. Moreover, it is found that the adsorption performance of the material can be further improved through reducing surface oxygen functional groups by a simple thermotreatment. Its adsorption capacity for aniline is enhanced by 1.7 times, demonstrating that the pi-pi dispersive interaction plays a primary role for the efficient adsorption. This adsorption mechanism is further confirmed by the excellent adsorption performance of the carbon materials for other analogue aromatic compounds (phenol, nitrobenzene). The super performance of the CO2-derived carbon adsorbents will be helpful for capturing CO2 as well as for removing organic pollutants.