3.4. Desorption and reusability study
Since the recycling and regeneration of adsorbent is very important in practical applications, the regeneration experiments for GO4–6 after saturated adsorption, which have relatively high MB
uptakes, have been carried out.
Based on Table 3, MB could be easily released from GO in the mixture of 2% NaOH aqueous solution and ethanol (1:1, v/v).
Furthermore, the adsorption and desorption processes were repeated to examine the potentials of GO.
Table 3 shows that recovery efficiency of GO is generally high and the adsorption capacity is affected little in four consecutive adsorption–desorption cycles.
In all, due to the high recycling efficiency, these GOs are qualified for practical application.