Synthesis of N-doped hierarchical porous carbon with excellent toluene adsorption properties and its activation mechanism

吸附 甲苯 化学工程 介孔材料 微型多孔材料 化学 碳纤维 无机化学 材料科学 有机化学 催化作用 复合材料 复合数 工程类
作者
Shengyong Lu,Xinlei Huang,Minghui Tang,Yaqi Peng,Shuchao Wang,Chengetai Portia Makwarimba
出处
期刊:Environmental Pollution [Elsevier BV]
卷期号:284: 117113-117113 被引量:70
标识
DOI:10.1016/j.envpol.2021.117113
摘要

Typical organic pollutants from coal-combustion flue gas such as volatile organic compounds (VOCs) need to be effectively controlled. This work synthesized a series of nitrogen-doped hierarchical porous carbons (NHPCs) by one-step activation with various proportions of cellulose, (NH4)2C2O4 and KHCO3/NaHCO3. The NHPCs have a high specific surface area and pore volume up to 2816 m2/g and 1.413 cm3/g as well as a hierarchical porous structure with micro-meso-macropores distribution. The dynamic adsorption tests of toluene at 600 ppm showed that NHPCs have a high adsorption capacity up to 585 mg/g (NHPC(K)131), this was about 3 times more than that of AC (208 mg/g), and is a better absorbent compared to many other carbon adsorbents. The porous characteristics and toluene adsorption properties of NHPCs improved along with the fluctuation of the proportions of raw materials and active agents. The micropore size of the material is the main factor that affecting the toluene adsorption capacity. The analysis of toluene dynamic adsorption breakthrough curves revealed that NHPCs had great toluene adsorption kinetics with high adsorption rate constants and short mass transfer zone. The excellent toluene adsorption kinetics of NHPCs can be attributed to the hierarchical porous structure. The abundant 2–10 nm mesopores and macropores of NHPCs act as mass transfer channels for toluene molecules. The XPS analysis showed that the NHPCs have nitrogen doping up to 6.71% (NHPC(Na)161) and they effectively promote toluene adsorption. The nitrogen doping mechanism can be attributed to the reactions between cellulose pyrolysis substances and NH3 which decomposed from (NH4)2C2O4. Moreover, the pore forming reactivity of KHCO3 is better than that of NaHCO3 in the NHPCs activation process.
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