Preparation of nano-graphene oxide and its reduction via a natural extract for its application as a photocatalyst in purifying water contaminated by malachite green dye
DOI:
https://doi.org/10.60037/edu.v14i1.2678Keywords:
graphene oxide, reduced graphene, polymethyl methacrylate, photocatalyst, malachite greenAbstract
Nanoscale graphene oxide (GO) was synthesized from waste materials, specifically pencils, utilizing a modified Hummer chemical method. In this process, phosphoric acid was used as a substitute for sodium nitrate. The resulting GO was then reduced using separate solutions of hibiscus extract and black tea extract, both of which served as natural reducing agents to convert GO into black reduced graphene (RGO). Both extracts demonstrated high activity, with the tea extract showing superior performance in reducing graphene oxide to reduced graphene in just 20 minutes. Both graphene oxide and reduced graphene were doped onto a water-insoluble polymer (PMMA) to fabricate solid polymeric nanocomposite films. These films were then evaluated for their effectiveness as photocatalysts under sunlight in degrading malachite green dye as a pollutant found in agricultural water and soil. The results showed that the polymer-incorporated graphene oxide film is highly efficient in removing dye from water when exposed to sunlight, completing the process in just 60 minutes. In contrast, polymer-incorporated reduced graphene oxide took 120 minutes to achieve similar results. Additionally, the polymer-incorporated graphene oxide film can be reused effectively to degrade a new dye solution, maintaining its high efficiency
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