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Suprihatin Suprihatin
Lampung University
Materials Science & Nanotechnology Physics

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Pengaruh Variasi H2SO4 Pada Pembentukan Nanosilika Berbasis Batu Apung Riska Trisna Nuraini; Posman Manurung; Suprihatin Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol 7, No 2 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v7i2.1954

Abstract

Nanosilica was extracted by using NaOH, H2SO4 and HCl. The amounth of NaOH and HCl are 3,0 M and 1,0 M respectively. The titration using H2SO4 was varied of 4,0 M; 4,5 M; 5,0 M; 5,5 M; 6,0 M. The pumice powder was calcined for 4 hours at 500 ºC and the nanosilica powder was calcined for 5,5 hours at 800 ºC. The results of X-Ray Flouresence (XRF) showed nanosilica with the highest purity in variation of H2SO4 5,0 M at 95,32%. The results of the X-Ray Diffractometer (XRD) showed that pumice consistent the anorthite and albite phase. The variation of H2SO4 5,0 M produced an amorphous phase. The results of Transmission Electron Microscopy (TEM) show nanosilica particle size with variations of H2SO4 5,0 M in the range 4,8-11,3 nm with an average (7,62 ± 2,15) nm.
Peningkatan Fungsi Daun Chaya sebagai Agen Reduksi pada Sintesis Seng Nanopartikel sri wahyu suciayti; Posman Manurung; Suprihatin Suprihatin; Fegi Liani
Jurnal Teori dan Aplikasi Fisika Vol 12, No 1 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i1.14202

Abstract

Nano-ZnO biosynthesis has been carried out using Chaya leaves with the addition of 0.7M NaOH. The aim is to determine the results of nano-ZnO synthesis regarding the formation of functional groups, phase structure, morphology, band gap energy, and its potential as an antibacterial. The synthesis process was carried out in three stages, namely, extraction of Japanese papaya leaves, synthesis of nano-ZnO, and characterization using Fourier Transform Infra Red (FTIR), X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and UV-Diffuse Reflectance (UV-DRS). Nano-ZnO samples were applied in antibacterial tests. The results of FTIR analysis show the formation of ZnO functional groups at wave numbers 599-509 cm-1 with the main functional groups involved being O-H, C=O, N-H, and C-N. The results of the XRD analysis showed that the phases formed in the sample were zinc oxide, zinc phosphate, zinc iron oxide and zinc chlorate hydrate. Factors that influence the formation of other phases are because Japanese papaya leaves contain phosphorus and iron, the ZnO phase formed has a wurtzite structure. The results of UV-DRS analysis show that the band gap energy is close to the standard of 3.24 eV with an absorbance value of 362 nm. TEM results show that the particle morphology experiences agglomeration due to the presence of other compounds. The antibacterial activity of Nano-ZnO with a NaOH concentration of 0.7 M resulted in an average zone of inhibition of bacterial growth in E.coli of 0.21 mm.
Co-Authors Fegi Liani Posman Manurung Riska Trisna Nuraini sri wahyu suciayti