Polyaniline as a Selective Adsorbent for NO2, SO2 and H2S: Thermal Influence and Gas – Specific Trends

This study presents a comprehensive analysis of polyaniline's adsorption capacity for three gases: nitrogen dioxide (NO2), sulfur dioxide (SO2) and hydrogen sulfide (H2S). Adsorption isotherms were investigated at various temperatures (293 K, 298 K, 303 K, 308 K, 313 K) to evaluate the effect of temperature on adsorption capacity. The results show that polyaniline exhibits superior adsorption capacity for SO2 of 250mg/g at 293 K and 105 Pa, achieving the highest adsorption capacity, followed by H2S of 200 mg/g and NO2 of 190 mg/g under the same reaction conditions. Notably, polyaniline demonstrated SO2 adsorption capability even at low fugacity. Increasing temperature reduced the adsorption capacity for all gases, consistent with the physisorption process. This study provides deep insights into the interaction between polyaniline and these gases, paving the way for the design of polyaniline-based adsorbent materials.