Biodiesel production waste as promising biomass precursor of reusable activated carbons for caffeine removal

摘要: Biodiesel production generates low particle size rapeseed waste (recovered from warehouse air filtration systems) that was herein explored as promising biomass precursor of chemically activated carbons. The influence several experimental parameters on the porosity development investigated. No benefit observed when solution impregnation made nor a significant dependence biomass : K2CO3 ratio and, expected, high obtained only for treatments at 700 °C. Microporous materials with apparent surface area around 1000 m2 g−1 were comparing favorably literature data regarding carbons processing by-products. A selected lab-made sample and two commercial tested adsorbents caffeine aqueous solution. Although present quicker adsorption rate, capacity reaches same value attained by benchmark material. regeneration tests over derived carbon through heat 600 °C 1 hour under N2 flow proved least exhaustion–regeneration cycles can be since material retains similar to fresh carbon. Therefore, management problem biodiesel industry – residue transformed in valuable properties environmental remediation processes.