Experimental Study on Adsorption of SO₂ and NH₃ by Activated Carbon with Monometallic Active Sites at Low Concentration under Room Temperature

Abstract

SO 2 and NH 3 are toxic compounds and are the main sources of airborne molecular contaminants (AMCs). Even at low concentrations, they can cause equipment corrosion and reduce product yield. Therefore, it is crucial to develop a combined SO 2 and NH 3 capture material with a simple process and a high adsorption capacity. In this study, dynamic adsorption breakthrough experiments were conducted at 23 °C under an air pollutant concentration of 90 ppm. The synergistic adsorption results showed that Cu/AC-0.05 had a high adsorption capacity of 1.03 mmol of SO 2 /g and 1.45 mmol of NH 3 /g. Furthermore, to confirm the rationality of the modification method, characterization methods such as BET, SEM-EDX, XRD, and TG-DSC were used to study the new adsorbent and spent adsorbent. The results showed that copper was successfully attached to the activated carbon and distributed uniformly. In this study, efficient coremoval performance of SO 2 and NH 3 was achieved by modifying single metal active sites. Through a comprehensive analysis of the characterization results, the surface reaction mechanism of SO 2 and NH 3 on the prepared material was further determined. This work provides a feasible option for a highly efficient adsorbent for both SO 2 and NH 3 capture at low concentrations under room temperature.

A Study on the Ability of Nanomaterials to Adsorb NO and SO2 from Combustion Gases and the Effectiveness of Their Separation

“…FT-IR spectroscopy confirmed the results of the elemental analysis, as well as those of the gas chromatographic investigation, observing the attenuation of the peaks specific to the functional groups in the material structure and the appearance of new peaks specific to the newly formed bonds with the SO 2 molecules. According to the literature, an increase in the number of hydroxyl groups facilitates the adsorption of sulfur dioxide, better observed in the case of Cu-Zn-MCM-41 by the appearance of a two-split peak at 2900-2970 cm −1 [69]. In the case of Fe-BTC and UiO-66, the specific peaks for the interaction were overlapped with the material's specific peaks.…”