Catalytic Degradation of Dye Pollutants with Nanozymes

With the continuous development of various industries, the demand for dyes in people's production and life is increasing year by year, which leads to the emission of more and more dye pollutants. However, many factories do not have perfect sewage facilities, so most dye wastewater is discharged directly into natural water bodies. Dye molecules that are discharged often react chemically with other pollutants, resulting in the creation of new pollutants and increasing the difficulty and cost of sewage treatment. Most dyes are highly stable against degradation and end up in the body along biological chains that can cause cancer and other diseases.

Enzymes play an important role in all aspects of production and life. Nanozymes have the advantage of replacing natural enzymes due to their good stability and also have great potential for pollutant degradation. Creative Enzymes provides a variety of nanozymes for catalytic degradation of dye contaminants to assist our clients with research in the nanozymes field.

Degradation of Rhodamine B with Nanozymes

• Rhodamine B (Rh B) is one of the commonly used xanthine organic dyes.
• Creative Enzymes prepares Fe₂GeS₄ nanozymes based on the homogeneous catalysis of iron ions on the surface of Fe₂GeS₄ and the homogeneous co-catalysis in the aqueous phase. It was found that Fe₂GeS₄ exhibits excellent degradation efficiency for different organic dyes.

Fig. 1 VO_X nanozyme as efficient catalysts for the oxidation of TMB and decomposition of Rh B. (Shi X, et al., 2018)

• We prepare VO_X nanozyme which is a highly efficient Fenton reagent, it can completely decompose Rh B within 60 seconds. The VO_X nanozyme oxidizes TMB efficiently with peroxidase-like activity. These results suggest that VO_X nanozymes can be used for efficient degradation of environmental pollutants.

Degradation of Orange G with Nanozymes

• Orange G (OG) is a commonly used azo dye in textiles.
• We successfully prepare CuO / Ti₆O₁₃ nanozyme composites and use them as a heterogeneous class of simulated enzyme Fenton catalysts. High catalytic activity was observed for the degradation of OG at neutral pH. This study provides a new idea for improving the treatment of organic dyes in wastewater treatment.

Degradation of Eriochrome Black T with Nanozymes

• Eriochrome black T (EBT) is a conventional azo dye, and its degradation products are naphthoquinone, etc. Naphthoquinone has been identified as a carcinogen; It can exist for a long time in aquatic ecosystems.

Fig. 2 Fe-based nanozymes are efficiently synthesized for food quality determination. (Kaur N, et al., 2018)

• We modify Fe₃O₄ nanozyme via stability and surface by co-precipitation method to enhance its mimic enzyme activity. It catalyzes the decomposition of H₂O₂ through the activity of peroxide-mimetic enzymes, which then produce a large number of active hydroxyl groups that can be used to degrade EBT in aqueous environments.

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