Abstract
An effort has been made to search a cheaper, easily available and simple alternative for the immobilization of enzymes and practical utilization in dye treatment. In this study, a porous zeolite-like geopolymer membrane (Geo) was used as immobilization support considering environmental friendliness, low cost and chemical/mechanical stability. A facile “cyclic adsorption” method was adopted to prepare the laccase immobilized geopolymer composite membrane (Geo-Lac). The results indicated that the pH-temperature range and stability were improved by adding the Geo support. The feasibility of removing crystal violet (CV) by the Geo-Lac was investigated in a batch mode and a flow-through mode, respectively. More than 99 % of CV (C0 = 5 mg/L) was removed with the Geo-Lac in a batch mode and the removal efficiency still remained over 93 % within 8 h of high-throughput filtration in a flow-through mode. Moreover, the Geo-Lac was much more durable, and after 4 cycles, it still had a removal efficiency of 90.02 ± 0.33 % for CV within 6 h of filtration. These results indicated that the porous geopolymer membrane is a promising support for both laccase immobilization and further applications in dye removal.
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