Production of activated bio-carbons from the residue of supercritical extraction of hops has been described. The precursor was first subjected to pyrolysis at 500 and 700 °C in nitrogen atmosphere. The bio-chars were next subjected to physical activation at 700 and 800 °C in carbon dioxide atmosphere. The effects of pyrolysis and activation temperature on the physicochemical properties and sorption capacity toward NO₂ were established. The results have shown that by physical activation of residue of supercritical extraction of hops it is possible to produce bio-sorbents with very high capacity towards NO_2, reaching maximum 79.2 mg/g. It has been proved that the effectiveness of NO₂ removal to large extent depends on the conditions of adsorption. The presence of steam in the stream of gases and preliminary wetting of the adsorbent bed have positive effect on the adsorption of NO₂ by the bio-sorbents obtained.

已经描述了从啤酒花的超临界萃取残留物中生产活性生物碳。首先将前体在氮气氛中在500和700°C下进行热解。接下来，将生物炭在二氧化碳气氛中在700和800℃下进行物理活化。建立了热解和活化温度对NO ₂的理化性质和吸附能力的影响。结果表明，通过啤酒花超临界萃取残留物的物理活化，可以生产出对NO ₂具有非常高容量的生物吸附剂_，最大吸附量为79.2 mg / g。已经证明NO ₂的有效性去除在很大程度上取决于吸附条件。气流中蒸汽的存在以及吸附床的初步润湿对所得生物吸附剂对NO ₂的吸附具有积极作用。