Comparative Analysis of Pressure Regions of Gaseous Benzene Using Ground Activated Carbon Sorbents Under Ambient Conditions

Azmatullah Khan, Saeedullah Jan Mandokhail, Naik Mohammad, Zafar Baloch, Mohammad Siddique, Muhammad Akram


The effective removal of atmospheric hazardous pollutants using activated carbon for the real-world application is a crucial and reliable process. Therefore, the performance comparison of ground activated carbon BPL 4×6 (ACb212) based on varied outlet pressure of benzene vapour were analyzed in ambient condition (room temperature and pressure). The maximum adsorption capacity was found ~110 mg. g-1) for all pressure regions. However, the competition showed maximum capacity for higher pressure region i.e., 50.5 mg. g-1, minimum capacity at lower pressure region 7.96 mg. g-1, and moderate for moderate outlet pressure 20.6 mg. g-1. On the other hand, the partition coefficient (PC) behaved inversely to the sorption capacity i.e., high PC (397 Pa-1) at the low outlet and low PC (1.47 Pa-1) at high outlet benzene partial pressure regions. The adsorption capacity on ACb212 followed the classical Langmuir isotherm of Type-1 at low and high-pressure outlet pressure regions, while a retrograde behaviour isotherm (Type-1) was observed for lowest benzene outlet partial pressure region. Furthermore, the linearized Langmuir isotherm analysis also confirmed the existence of two or more sorption sites for gaseous benzene.


Benzene; Activated Carbon; Adsorption; Retrograde; Langmuir Isotherm

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