Adsorption of SO₂on Sewage Sludge-Derived Materials

Abstract

Sewage sludge-derived materials carbonized at temperatures between 400 and 950 degrees C were used for adsorption of sulfur dioxide from dry and moist air. The materials were characterized using sorption of nitrogen and thermal analysis. The sulfur dioxide capacity was measured according to a laboratory-developed breakthrough test. It was found that the capacity of the adsorbents increases with increasing temperature of carbonization. It is likely that during carbonization at high temperatures such catalytic metals as calcium become active. They play a significant role in the SO2 removal process by neutralization of sulfuric acid formed as a result of oxidation of sulfur dioxide in wet conditions. Besides sulfuric acid, various sulfur-containing salts are formed. It was shown that, after their removal using waterwashing,the SO2 capacitysignificantly decreased.

Adsorption of sulfur dioxide using nickel oxide/carbon adsorbents produced by one-step pyrolysis method

“…For the unexposed samples, the weight loss between 250 • C and 450 • C represents decomposition of inorganic matter and/or decomposition of oxygen-containing functional groups [33]. After exposure to SO 2 at dry conditions, the main peak between 350 • C and 550 • C corresponds to dehydroxylation of surface hydroxyl groups and/or volatilization of sulfates that are formed by reaction of inorganic components or metal oxides of the adsorbents with adsorbed sulfur dioxide [34,35]. Furthermore, the Fourier-transform infrared spectra are also used to illustrate the adsorption mechanism.…”

Investigation of the Sorption Properties of Ore Materials for the Removal of Sulfur Dioxide from Exhaust Flue Gases of Power Plants

“…High specific surface area (up to 880 m 2 /g) and pore volume (up to 0.46 cm 3 /g) along with the presence of metal oxides in the sorbent composition provide quite a high dynamic capacity for sulfur dioxide (up to 50 mg/g). Investigation of sulfur dioxide adsorption (0.3% in air) at room temperature revealed that humidification of the gas stream (up to a relative humidity of 80%) results in a more efficient adsorption of SO 2 : under such conditions, dynamic capacity of the sorbent was approximately two times higher as compared to the dry gas [12]. The beneficial effect of water on SO 2 adsorption is attributed to the formation of surface hydroxyl groups in metal oxides.…”

A Green Desulfurization Technique: Utilization of Flue Gas SO2 to Produce H2 via a Photoelectrochemical Process Based on Mo-Doped BiVO4

“…(Lelieveld and Heintzenberg, 1992 ; McDonald-Buller et al, 2016 ). Till now, to remove SO 2 released from the burning of fossil fuels, several effective methods has been developed (Srinivasan and Grutzeck, 1999 ; Bashikova et al, 2001 ; Xia et al, 2011 ; Kaplan et al, 2013 ; Yang et al, 2013 ). Among these technologies, Wet Flue Gas Desulfurization (WFGD) has been one of the state-of-the-art technologies for SO 2 removal with high efficiency, simple equipment and obtaining multi-useful byproducts (Yang et al, 2012 ; Lu et al, 2013 ).…”