A high adsorption capacity bamboo biochar for CO2 capture for low temperature heat utilization

Due to burgeoning carbon dioxide (CO2) emission, adsorption post-combustion capture technology gathers momentum. Cost-effective adsorbents with prominent performance draw more attention. Thus, a novel KOH activation biomass-derived activated carbon, i.e. BBC-KOH, is developed and investigated in terms of textural properties, adsorption/desorption temperatures, desorption heat and cyclic stability. A techno-economic assessment of a solar-assisted coal-fired power plant integrated with temperature swing adsorption process is conducted to evaluate potential merits in a practical application. Results demonstrate that BBC-KOH could perform an excellent adsorption capacity (1.50 mmol·g−1 at 25 °C) with a low desorption temperature (1.42 mmol·g−1 at 70 °C) and could be desorbed completely at 80 °C, i.e. 1.54 mmol·g−1. Compared with solar-assisted coal-fired power plant systems using monoethanolamine and polyethyleneimine/silica, carbon emission intensity, levelized cost of electricity and cost of CO2 removed of the system using BBC-KOH always show the best performance, corresponding to 93.22 g·kWh−1, 59.19 USD·MWh−1 and 14.12 USD·tonCO2-1, respectively. It reveals that BBC-KOH may be a potential solution to carbon capture with low capital cost, low regeneration temperature and excellent adsorption capacity.