China Petroleum Processing & Petrochemical Technology ›› 2023, Vol. 25 ›› Issue (1): 66-78.

• Process Research • Previous Articles     Next Articles

Heteroatomic Modification of Solid-Waste-Based Mesoporous Carbon for Volatile Organic Compound Adsorption

Liu Jun1,2; Li Zhi2,3; Xu Ke4; Zhang Xinyang4; Li Yunpeng4; Wang Ya2; Zhang Yongfa3; Yang Song3,5; Liu Shoujun3,5; Li Junhua2   

  1. 1. College of Chemistry, Taiyuan University of Technology, Taiyuan 030024;
    2. State Key Joint Laboratory of Environment Simulation and Pollution Control, National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing 100084;
    3. State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024;
    4. Shandong Pengda Ecological Technology Co., Ltd., Zibo, Shandong 255420;
    5. Taiyuan Green Coke Energy Co., Ltd., Taiyuan 030006
  • Received:2022-11-29 Revised:2022-12-06 Online:2023-03-30 Published:2023-03-30
  • Supported by:
    National key R&D Program of China

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Abstract: Solid waste-based activated carbon (AC) was utilized as a carbon source to synthesize a series of carbon-based functional material RAC-X (X= P and S). The toluene adsorption capacities of RACs samples can be significantly improved adopting the heteroatomic modification strategy. TheRACs modified by phosphoric acid and sulfuric acid have the same specific surface area (1156 m2/g) and the similar porous structure. However, their exists the different toluene adsorption capacities, RAC-P of 316.22 mg/g and RAC-S of 460.12 mg/g, respectively, which are 1.6 and 2.4 times greater than that of RAC. Through X-ray photoelectron spectroscopy measurements, it is found that the increase in the amount of π–π* chemical bond over the AC surface results in an improvement in the toluene adsorption performance. Density functional theory results show that the S-containing functional groups loaded near the defect sites of RAC-S promote the adsorption energy for the toluene. Moreover, reusability tests show that RAC-S still retains 86% of the adsorption activity after four consecutive adsorption–desorption experiments. This indicates that the heteroatomic modification method exhibits an excellent toluene adsorption performance and recycling practicability, which not only is beneficial for achieving the rational utilization of solid waste resources but also provides a practical method for the efficient elimination of VOCs.

Key words: waste activated carbon, toluene adsorption, heteroatomic modification, functional groups, DFT analysis