Electronic Theses and Dissertation

Green synthesis nanopartikel ZnO menggunakan esktrak daun eceng gondok dan ZnSO4 sebagai prekursor, serta uji aktivitas fotokatalitiknya pada penghilangan zat warna Napthol Blue Black (NBB) telah dilakukan. Karakterisasi nanopartikel ZnO yang diperoleh dilakukan menggunakan instrument X-Ray Difraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) dan Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS). Nanopartikel ZnO yang diperoleh memiliki bentuk yang tidak beraturan berupa serbuk berwarna putih dengan ukuran kristal rata-rata 28,99 nm. Hasil uji aktivitas fotokatalis nanopartikel ZnO pada penghilangan zat warna NBB menunjukkan aktivitas paling tinggi dengan persen degradasi zat warna NBB hingga 90,27% selama 270 menit di bawah sinar UV dan 91,20% selama 210 menit di bawah sinar matahari. Aktivitas fotokatalitik tersebut diperoleh pada kondisi optimum pH 2, massa fotokatalitik 250 mg dan konsentrasi awal zat warna NBB 15 ppm. Uji aktivitas fotokatalitik pada penghilangan limbah cair dari proses pewarnaan batik menghasilkan persen degradasi hingga 90,67% selama 300 menit di bawah sinar UV dan 92,08% selama 180 menit di bawah sinar matahari
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Kata kunci : Nanopartikel ZnO, daun eceng gondok, fotokatalis dan Napthol Blue Black

Green synthesis of ZnO nanoparticles using water hyacinth leaf extract and ZnSO4 as precursor and its photocatalytic activity evaluation on the removal of Napthol Blue Black (NBB) dye have been carried out. The characterization of the resulting ZnO nanoparticles was performed by using X-Ray Difraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS) instruments. The white powder ZnO nanoparticles obtained were irregular in shape and size with the average crystallite size of 28.99 nm. The results of photocatalytic activity test of ZnO nanoparticles on the removal NBB dye showed that the highest degradation percentage were 90.27% after irradiated for 270 minutes under UV light and 91.20% after irradiated under sunlight for 210 minutes, respectively. The optimum photocatalytic activity was obtained at pH 2, photocatalyst mass of 250 mg, and initial concentration of dye 15 ppm. The photocatalytic activity test on the removal of batik wastewater containing dye showed the degradation percentage up to 90.67% after irradiated under UV light for 300 minutes and 92.08% after irradiated under sunlight for 180 minutes, respectively. Keywords : ZnO nanoparticles, water hyacinth leaf, photocatalyst, Napthol blue black