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Abstrak :
ZnO/NiBi2O4, NiBi2O4, dan ZnO berhasil disintesis secara green synthesis menggunakan ekstrak daun patikan kebo (EDPK) dalam sistem dua fasa melalui metode sol gel. Hasil sintesis dilakukan karakterisasi menggunakan Spektroskopi FTIR, Spektrofotometer UV-Vis DRS, XRD, dan FE-SEM. Kandungan metabolit sekunder seperti alkaloid, saponin, dan steroid pada ekstrak daun patikan kebo berperan penting dalam proses sintesisyang telah dikarakterisasi dengan FTIR dan Spektrofotometer UV- Vis. Alkaloid berperan sebagai sumber basa lemah sedangkan saponin berperan sebagai capping agent dalam proses sintesis. Didapatkan nilai band gap untuk ZnO/NiBi2O4, NiBi2O4, ZnO masing masing sebesar 2,72eV, 1,83 eV, dan 3,11 eV yang diukur dengan Spektrofotometer UV-Vis DRS. Hasil studi aktivitas fotokatalitik ZnO/NiBi2O4 menunjukkan degradasi malasit hijau yang lebih baik dibandingkan dengan ZnO dan NiBi2O4. Persentase degradasi malasit hijau 5 mg nanokomposit ZnO/NiBi2O4, nanopartikel NiBi2O4, dan nanopartikel ZnO masing masing sebesar 92,30%, 77,33%, dan 55,99 dibawah sinar tampak selama 120 menit. ......In this rearch, ZnO/NiBi2O4, NiBi2O4, and ZnO were successfully synthesized by green synthesis using patikan kebo leaf extract (EDPK) in a two-phase system using the sol gel method. The results of the synthesis were characterized using FTIR Spectroscopy, UV- Vis Spectrophotometer DRS, XRD, and FE-SEM. The content of secondary metabolites such as alkaloids, saponins, and steroids in patikan kebo leaf extract plays an important role in the synthesis process which has been characterized by FTIR and UV-Vis Spectrophotometer. Alkaloids act as a source of weak bases while saponins act as capping agents in the synthesis process. The band gap values for ZnO/NiBi2O4, NiBi2O4, ZnO were 2.72eV, 1.83 eV, and 3.11 eV, respectively, as measured by the DRS UV-Vis Spectrophotometer. The results of the study on the photocatalytic activity of ZnO/NiBi2O4 showed better degradation of green malachite than ZnO and NiBi2O4. The degradation percentage of 5 mg green malachite nanocomposite ZnO/NiBi2O4, NiBi2O4 nanoparticles, and ZnO nanoparticles were 92.30%, 77.33%, and 55.99 respectively under visible light for 120 minutes.

Abstrak :
Nanokomposit ZnO/CuO dengan lima variasi molar ZnO:CuO (1:3, 1:1, 1:0.5, 1:0.3, dan 1:0.1) telah disintesis dengan menggunakan metode sol-gel. Pengukuran X-ray Diffraction (XRD), Energy Dispersive X-Ray (EDX), Field Emission Scanning Electron Microscopy (FESEM), nitrogen adsorption spectroscopy, Electron Spin Resonance (ESR), dan UV-Visible spectroscopy dilakukan untuk mengindentifikasi struktur, morfologi, luas permukaan, resonansi ion-ion, dan nilai celah energi dari nanokomposit. Aktivitas katalitik dari nanokomposit ZnO/CuO diuji dibawah pemaparan cahaya visible, ultraviolet, ultrasonik, dan gabungan antara visible/UV dengan ultrasonik dalam mendegradasi larutan pewarna methylene blue (MB). Hasil aktivitas katalitik dari nanokomposit ZnO/CuO menunjukkan aktivitas photosonocatalytic mempunyai performa lebih baik dibandingkan aktivitas photocatalytic dan sonocatalytic. Penambahan beberapa scavenger menunjukkan hole merupakan spesies aktif yang berperan paling penting dalam mekanisme katalitik.

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ZnO/CuO nanocomposites with five different ZnO:CuO ratios (1:3, 1:1, 1:0.5, 1:0.3 and 1:0.1) were prepared using sol-gel method. X-ray Diffraction (XRD), Energy Dispersive X-Ray (EDX), Field Emission Scanning Electron Microscopy (FESEM), nitrogen adsorption spectroscopy, Electron Spin Resonance (ESR) and UV-Visible spectroscopy were employed to investigate the structural, morphology, surface area, ions resonance and energy band gap of nanocomposites. The catalytic activity of ZnO/CuO nanocomposites were tested under visible light, ultraviolet light, ultrasound irradiation and the combination of visible/UV light with ultrasound irradiation on the degradation of methylene blue (MB) aqueous solution. The observed catalytic activity of nanocomposites shows that photosonocatalytic has better performance than photocatalytic and sonocatalytic activity. The addition of scavengers suggested that holes are the most important active species in the catalytic mechanism.