Abstract:
This research aimed to prepare adsorbent material from modified waste tire rubber (WR) by amine to increase selectivity for CO2 capture. Various factors which studied were inlet flowrate (50, 70 and 100 ml min-1), WR particle size (20, 40 and 60 mesh), WR with and without acid treatment, amine type (Tetraethylenepentamine: TEPA, Polyethylenimine: PEI), amine concentration (2.5, 5 and 10 %w/w) and adsorption temperature (30, 45 and 60 oC). The adsorbent materials were characterized by analysis of specific surface area, functional groups, percentage of element and morphology. The CO2 adsorption ability of WR was investigated by using a stainless steel reactor under ambient temperature and atmospheric pressure. The results showed that the CO2 adsorption capacity of WR with 60 mesh size increased after treated by 1 M sulfuric acid solution (WR60A) compared to WR60 using the inlet gas of 70 ml min-1. Then, to optimize amine type and amine concentration, WR60 before acid treatment was modified to investigate CO2 adsorption capacity. It was found that the CO2 adsorption capacity of WR60 after 10%w/w TEPA modification was the highest (10.41 mg g-1). After that, WR60 after acid treatment (WR60A) modified with 10%w/w TEPA showed the increase of CO2 adsorption capacity (11.64 mg g-1) under the ambient temperature and atmospheric pressure using the inlet flowrate at 70 ml min-1. It can be concluded that the CO2 adsorption capacity of WR60A_10T was the highest. In this research, the CO2 adsorption capacity after regeneration and kinetic of adsorbents was also studied. It was found that the CO2 adsorption capacity of WR60A_10T was dropped by only 4.02 % after 10th cycle adsorption-desorption. The CO2 adsorption mechanism could be explained by Avramis kinetic model