ABSTRAK
Nanomaterial Bi2O3-WO3 disintesis menggunakan ekstrak daun yodium Jatropha multifida yang mengandung alkaloid sebagai sumber basa dan saponin sebagai surfaktan alami. Nanopartikel hasil sintesis dikarakterisasi dengan X-ray diffraction XRD , Fourier transform infrared FTIR , PSA, Spektrofotometer UV-Visible UV-Vis , Scanning electron microscope SEM , dan Transmission electron microscopy TEM . Karakterisasi dengan XRD menunjukkan bahwa Bi2O3 memiliki struktur kristal monoklinik, WO3 memiliki struktur kristal triklinik, dan nanomaterial Bi2O3-WO3 memiliki struktur tetragonal. Berdasarkan hasil karakterisasi TEM, nanomaterial Bi2O3-WO3 memiliki ukuran 45,58 nm dengan energi band gap sebesar 2,86 eV. Aplikasi aktivitas fotokatalitik malachite green diamati pada daerah sinar tampak. Persentase degradasi malachite green dengan nanopartikel Bi2O3, WO3, dan nanomaterial Bi2O3-WO3 masing-masing adalah 9,24 ; 30,59 ; dan 94,79 selama 2 jam waktu penyinaran.

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ABSTRACT
Synthesis nanomaterials Bi2O3 WO3 was succesfully performed using yodium leaf extract Jatropha multifida with alkaloid for a base source and saponin as biosurfactant. The synthesized nanoparticles and nanomaterials were characterized with X ray diffraction XRD , Fourier transform infrared FTIR , PSA, Spectrophotometry UV Visible UV Vis , Scanning electron microscope SEM , and Transmission electron microscopy TEM . Characterization with XRD shows that nanoparticles Bi2O3 have a monoclinic cyrstal structure, WO3 have a triclinic cyrstal structure, and nanomaterials Bi2O3 WO3 have a tetragonal cyrstal structure. Based on TEM characterization, size of nanomaterials Bi2O3 WO3 is 45.58 nm with band gap energy of 2.86 eV. Activity photocatalytic of application malachite green were observed using visible light radiation. Percentage of degradation malachite green with nanoparticles Bi2O3, WO3, Bi2O3 WO3 nanomaterials were 9.24 30.59 and 94.79 for 2 hours.