Immobilized laccase on polyimide aerogels for removal of carbamazepine

•Polyimide aerogels were obtained with an efficient environmental-friendly method.•Polyimide aerogels can be used as support materials for enzyme immobilization.•The resulted carbamazepine removal efficiency is high. Since it is known that conventional wastewater treatment plants cannot completely r...

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Bibliographic Details
Published in:Journal of hazardous materials 2019-08, Vol.376, p.83-90
Main Authors: Simón-Herrero, Carolina, Naghdi, Mitra, Taheran, Mehrdad, Kaur Brar, Satinder, Romero, Amaya, Valverde, José L., Avalos Ramirez, Antonio, Sánchez-Silva, Luz
Format: Article
Language:English
Subjects:
Aerogels
Covalent immobilization
Laccase
Polyimide
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Summary:•Polyimide aerogels were obtained with an efficient environmental-friendly method.•Polyimide aerogels can be used as support materials for enzyme immobilization.•The resulted carbamazepine removal efficiency is high. Since it is known that conventional wastewater treatment plants cannot completely remove pharmaceutical compounds, such as carbamazepine, the need for their removal has intensified. The use of biocatalysts, such as enzyme is an environmentally friendly method for carbamazepine biodegradation. Nevertheless, enzyme immobilization is required to facilitate the recovery and reusability and avoid the loss of enzyme. In this work, laccase was immobilized on modified polyimide aerogels by means of covalent bonding. Results showed that the immobilized laccase on polyimide aerogels possesses significantly improved activity under acidic or basic pH range in comparison with the free enzyme. Furthermore, for all the temperature range the activity of the immobilized enzyme was higher compared to the free enzyme form. The storage stability improved by the immobilization on this support material. The reusability tests towards oxidation of 2, 2′-azino-bis (3-ethylbenzothiazoline-6-sulphonicacid) (ABTS) showed that the immobilized laccase maintained 22% of the initial activity after 7 cycles. Immobilized laccase on polyimide aerogels for carbamazepine (CBZ) degradation exhibited 76% and 74% removal in spiked water and secondary effluent, respectively. Furthermore, after 7 cycles the CBZ removal efficiency remained higher (50% and 65% for spiked water and secondary effluent, respectively).
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2019.05.032