Inorganic Chemicals Industry ›› 2026, Vol. 58 ›› Issue (3): 65-71.doi: 10.19964/j.issn.1006-4990.2025-0166

• Research & Development • Previous Articles     Next Articles

Study on microwave modification of activated carbon by ammonia and its adsorption for separation of polycyclic aromatic hydrocarbons

LI Lei1(), HAN Enshan1(), LI Bin2, SUN Zhenhai2, HE Yanzhen1   

  1. 1.School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300400,China
    2.CNOOC Tianjin Chemical Research and Design Institute Co. ,Ltd. ,Tianjin 300131,China
  • Received:2025-04-14 Online:2026-03-10 Published:2025-08-12
  • Contact: HAN Enshan E-mail:l2586991259@163.com;eshan@hebut.edu.cn

Abstract:

Excessive content of polycyclic aromatic hydrocarbons(PAHs) can significantly affect the quality of diesel and cause environmental pollution.In response to the demand for efficient removal of PAHs in diesel,modified activated carbon(WMAC) was prepared by ammonia water microwave modification method in this study.By characterizing the surface morphology,pore structure and surface properties of the samples under different modification conditions,and using simulated oil products as raw materials,the PAHs separation performance was investigated by using a fixed-bed adsorption separation device.The results showed that the specific surface area of WMAC-600W modified by 600 W microwave power reached 1 059 m²/g(65.7% higher than that of unmodified activated carbon AC),the total pore volume was 0.66 cm³/g(78.4% higher),and the average pore diameter was increased by 17.4%.The static adsorption capacity of methyl naphthalene was 98.34 mg/g(80.9% higher than AC)at 20 ℃,the dynamic saturated adsorption capacity reached 196.47 mg/g(99.0% higher),and it still maintained good adsorption stability after five regenerations.In the simulated diesel adsorption separation,the average desorption time of PAHs of WMAC-600W was shortened by 6 min compared with MAC-10-5,the desorption capacity was increased significantly,and the adsorption capacity of PAHs in commercial diesel was as high as 187.34 mg/g.The studies showed that microwave modification of ammonia water could significantly improve the adsorption and separation performance of activated carbon by optimizing its pore structure and surface chemical properties.WMAC-600W could be used as a potential adsorption material for the efficient removal of PAHs in diesel.

Key words: activated carbon, polycyclic aromatic hydrocarbons, adsorption separation, microwave modification

CLC Number: