We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Catalytic and Physicochemical Evaluation of a TiO2/ZnO/Laccase Biocatalytic System: Application in the Decolorization of Azo and Anthraquinone Dyes
Summary
Researchers developed a biocatalytic system combining titanium dioxide, zinc oxide, and the enzyme laccase to break down textile dyes in wastewater. The system successfully decolorized two types of synthetic dyes used in fabric manufacturing. While not directly about microplastics, synthetic dye wastewater from textiles also carries microfibers, and treatments that address both problems together are environmentally valuable.
A TiO2/ZnO oxide system was proposed as a support for the immobilization of laccase from Trametes versicolor (LTV). The obtained TiO2/ZnO/LTV biocatalytic system was then applied in the decolorization/degradation of C.I. Reactive Black 5 and C.I. Acid Green 25 dyes. The efficiency of immobilization was evaluated based on catalytic properties (Bradford method, oxidation reaction of 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)) and physicochemical (spectroscopic, porous, electrokinetic) analysis. The immobilization process was carried out with high performance (99.4%). Immobilized laccase retained about 40% of its activity in the whole analyzed temperature range and after 10 reaction cycles. Immobilization efficiency was also indirectly confirmed by the presence of characteristic functional groups (-C-H and -C-O), nitrogen and carbon on the TiO2/ZnO/LTV biocatalytic surface, identified by spectroscopic analyses. The increase in the surface area to 126 m2/g, change of isoelectric point (2.0) and zeta potential ranges (from +12.0 to -20.0 mV) after the immobilization process were also observed. The results show that the designed biocatalytic system enables the removal of acid dyes (C.I. Reactive Black 5 and C.I. Acid Green 25) with high efficiency (99% and 70%, respectively). Mass spectroscopy analysis indicated possible degradation products formed by the cleavage of N=N and C-N bonds.
Sign in to start a discussion.
More Papers Like This
Harnessing Bio-Immobilized ZnO/CNT/Chitosan Ternary Composite Fabric for Enhanced Photodegradation of a Commercial Reactive Dye
This paper is not about microplastics; it describes the fabrication and testing of a ZnO/carbon nanotube/chitosan composite fabric as a photocatalyst for degrading textile dye (Reactive Blue 4) in wastewater, with no connection to microplastic research.
Microbial degradation of dyes: An overview
Researchers reviewed microbial degradation of synthetic dyes — major industrial wastewater pollutants — summarizing the bacterial, fungal, and genetically engineered organism pathways involved in azo dye breakdown, and discussing factors such as pH, temperature, and co-substrate availability that govern decolorization efficiency.
Synergistic Microbial Degradation of Microplastics and Toxic Dyes Showing Potential Reuse of the Degraded Dye Metabolites
Researchers isolated bacteria from textile dyeing wastewater capable of degrading both polyethylene microplastics and toxic dyes simultaneously, demonstrating a synergistic microbial approach to treating combined plastic and textile effluent pollution.
Purification and Biochemical Characterization of Trametes hirsuta CS5 Laccases and Its Potential in Decolorizing Textile Dyes as Emerging Contaminants
Three laccase isoforms from Trametes hirsuta CS5 were purified and characterized, with the ThII isoform showing the highest catalytic efficiency; all isoforms effectively decolorized synthetic textile dyes, supporting their potential as eco-friendly biocatalysts for treating dye-containing wastewater.
Advances and Feasibility of Biocatalytic Technologies for Dye Removal
This review examines advances in biocatalytic technologies for treating dye-containing wastewater, focusing on enzyme immobilization techniques using materials like nanoparticles and biopolymers. Researchers found that immobilized enzymes such as laccase and peroxidase show improved stability and reusability for breaking down dye pollutants. The study suggests that biocatalytic approaches offer an environmentally friendly alternative to conventional chemical wastewater treatments.