Carbon dioxide adsorption in chemically activated carbon from sewage sludge

Abstract

Adsorption methods are one of the current ways to reduce CO2 emissions. Taking this into account, sewage-sludge-based activated carbons were produced to study their CO2 adsorption capacity. Specifically, chemical activation with KOH and NaOH of previously pyrolyzed sewage sludge was carried out. The results obtained show that even with a low BET surface area, the adsorption capacity of these materials was comparable to that of a commercial activated carbon. As a consequence, the use of sewage-sludge-based activated carbons is a promising option for the capture of CO2 and an interesting application for this waste.

Biomass based activated carbon obtained from sludge and sugarcane bagasse for removing lead ion from wastewater

“…The present study confirmed there were 7 different factors which affected the properties of the adsorbent through orthogonal and single-factor experiments: particle size of sludge (0.074 mm, 0.1 mm, 0.2 mm, 0.45 mm, 1 mm); concentration of KOH solution (1 mol/L, 3 mol/L, 5 mol/L, 7 mol/L, 10 mol/L) (de Andrés et al, 2013;Monsalvo et al, 2011;Smith et al, 2009); bagasse/sludge (w/w) (10%, 20%, 30%, 40%, 50%) ; [(sludge + bagasse)/KOH solution] (w/w) (1:1, 1:2, 1:3, 1:4, 1:5) (Smith et al, 2009;Rozada et al, 2005); drying time of the loaded graphite boat (0.25 h,1 h, 6 h, 12 h, 24 h); activation temperature (500°C, 600°C, 700°C, 800°C, 900°C) (Ren et al, 2012); and activation time (0.5 h, 1 h, 1.5 h, 2 h, 3 h) (Gómez-Pacheco et al, 2012). Finally, the optimal condition of these factors was obtained and B-SBA-K was produced.…”

“…This phenomenon can be explained by the strong interaction between the sludge, the bagasse and KOH in the graphite boat. During the high temperature process, KOH eroded the sludge and bagasse, forming many pores (de Andrés et al, 2013). This resulted in a higher adsorption capacity of iodine and methylene blue.…”

Surface characteristics of KOH-treated commercial carbons applied for CO2 adsorption

“…According to Lee et al (2014), an activation of ordered nanoporous carbons with KOH caused an increase of specific surface area and total pore volume, which resulted in the enhancement of CO 2 adsorption capacity. A similar conclusion was drawn by de Andres et al (2013); however, better results were reached using solid NaOH. Wei et al (2012) reported a high surface area and CO 2 uptake at high pressure (3.57 MPa) of activated carbon produced from Finger Citron residue and treated with KOH.…”

Breakthrough adsorption studies of mixed gases on mango (Mangifera indicaL.) seed shell derived activated carbon extrudes

“…64 The feasibility of bio-carbon as adsorbent in water streams [28] 65 are well studied for the removal of colour [29,30] and hazardous 66 metal [31][32][33]. Adsorption of various gases and volatiles on 67 biomass derived activated carbon was reported [34][35][36][37][38][39][40][41], still many 68 of the biomass derived activated carbon need to be evaluated as 69 potential adsorbent in gas phase. Breakthrough adsorption of 70 mixed gases on bio-carbons is very rarely addressed, for gas 71 separation application.…”