The organic dyes such as 4-NP, methyl blue, and methyl orange and
DB24 are typical representative of high toxicity and persistent common
organic pollutants in industrial and agricultural wastewater [36]. Especially
these are abundantly present in industrial air, effluents and soil.
Due to this reason it is regulated by the U.S. Environmental Protection
Agency (EPA) [37]. Therefore, organic dyes were chosen as a model pollutant
for this catalytic degradation study. These are readily soluble in
water. Initially the addition of NaBH4 alone to the organic dyes did not
reduce/degrade, but the addition of AuNPs degraded dyes within
20 min