Block Inga, Günter Christina, Duarte Rodrigues Alysson, Paasch Silvia, Hesemann Peter, Taubert Andreas
Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam, Germany.
Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam, Germany.
Materials (Basel). 2021 Jul 16;14(14):3996. doi: 10.3390/ma14143996.
Activated carbons (ACs) were prepared from dried spent coffee (SCD), a biological waste product, to produce adsorbents for methylene blue (MB) and methyl orange (MO) from aqueous solution. Pre-pyrolysis activation of SCD was achieved via treatment of the SCD with aqueous sodium hydroxide solutions at 90 °C. Pyrolysis of the pretreated SCD at 500 °C for 1 h produced powders with typical characteristics of AC suitable and effective for dye adsorption. As an alternative to the rather harsh base treatment, calcium carbonate powder, a very common and abundant resource, was also studied as an activator. Mixtures of SCD and CaCO (1:1 /) yielded effective ACs for MO and MB removal upon pyrolysis needing only small amounts of AC to clear the solutions. A selectivity of the adsorption process toward anionic (MO) or cationic (MB) dyes was not observed.
活性炭（ACs）由干燥的废弃咖啡渣（SCD）制备而成，SCD是一种生物废弃物，旨在制备用于从水溶液中吸附亚甲基蓝（MB）和甲基橙（MO）的吸附剂。通过在90℃下用氢氧化钠水溶液处理SCD实现其预热解活化。将预处理后的SCD在500℃下热解1小时，得到具有适合且有效用于染料吸附的典型AC特性的粉末。作为相当苛刻的碱处理的替代方法，还研究了碳酸钙粉末，一种非常常见且丰富的资源，作为活化剂。SCD和CaCO（1:1 /）的混合物在热解后产生了用于去除MO和MB的有效ACs，仅需少量AC即可使溶液澄清。未观察到吸附过程对阴离子（MO）或阳离子（MB）染料的选择性。
