Carbon Adsorbents from Spent Coffee for Removal of Methylene Blue and Methyl Orange from Water

Materials

Peter Hesemann¹  Alysson Duarte Rodrigues¹  Inga Block²  Andreas Taubert²  Christina Günter³  Silvia Paasch⁴ 

[1] ICGM, Univ Montpellier-CNRS-ENSCM, 34090 Montpellier, France;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;Professur für Bioanalytische Chemie, TU Dresden, Bergstraße 66, D-01062 Dresden, Germany;

关键词: water;    spent coffee;    dye adsorption;    methylene blue;    methyl orange;    calcium carbonate;   

DOI  :  10.3390/ma14143996

来源: DOAJ

【 摘 要 】

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 CaCO₃ (1:1 w/w) 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.

【 授权许可】

Unknown