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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Riset Kimia Indonesian Journal of Chemical Science Pelita Eksakta
Veronita, Silvi
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology Mathematics Physics Other

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Synthesis and Characterization of ZnO Nanoparticles Using Sol-Gel Method Ningsih, Sherly Kasuma Warda; Khair, Miftahul; Veronita, Silvi
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

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Abstract

ZnO nanoparticles have many applications in photocatalysis. The sol-gel technique is one of the lowest-cost and easy-to-perform methods for synthesizing ZnO nanoscale. The purpose of this study was to determine the effect of precursors on the characteristics of the ZnO nanoparticles obtained by using the sol-gel method, including examining the purity of ZnO nanopowder, crystal structure/size, and morphology. ZnO nanopowder was prepared using zinc acetate dihydrate, zinc chloride, and zinc sulfate heptahydrate as various precursors, and calcination was carried out at temperatures of 400 and 600°C. ZnO nano powder was characterized by Energy Dispersive X-Ray Fluorescence (ED-XRF), X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM). ED-XRF data shows that the highest purity of ZnO is 97.2% using zinc acetate dehydrate precursor. The precursors greatly influence the crystal structure and size of the ZnO nanopowders. In this study, the XRD ZnO pattern shows the hexagonal structure (wurtzite) with the crystal size of the ZnO nanopowders is 37-84 nm. Temperature variations affect the structure and morphology of ZnO powder. SEM micrographs of ZnO nanopowders are small spherical and twig-like agglomerations.
Synthesis and Characterization of ZnO Nanoparticles Using Sol-Gel Method Ningsih, Sherly Kasuma Warda; Khair, Miftahul; Veronita, Silvi
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ZnO nanoparticles have many applications in photocatalysis. The sol-gel technique is one of the lowest-cost and easy-to-perform methods for synthesizing ZnO nanoscale. The purpose of this study was to determine the effect of precursors on the characteristics of the ZnO nanoparticles obtained by using the sol-gel method, including examining the purity of ZnO nanopowder, crystal structure/size, and morphology. ZnO nanopowder was prepared using zinc acetate dihydrate, zinc chloride, and zinc sulfate heptahydrate as various precursors, and calcination was carried out at temperatures of 400 and 600°C. ZnO nano powder was characterized by Energy Dispersive X-Ray Fluorescence (ED-XRF), X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM). ED-XRF data shows that the highest purity of ZnO is 97.2% using zinc acetate dehydrate precursor. The precursors greatly influence the crystal structure and size of the ZnO nanopowders. In this study, the XRD ZnO pattern shows the hexagonal structure (wurtzite) with the crystal size of the ZnO nanopowders is 37-84 nm. Temperature variations affect the structure and morphology of ZnO powder. SEM micrographs of ZnO nanopowders are small spherical and twig-like agglomerations.
Struktur, Sifat Dielektrik dan Optik Senyawa Aurivillius (Ca0,5Ba0,5)Bi4Ti4O15 yang Disintesis dengan Teknik Lelehan Garam Veronita, Silvi; Septiani, Upita; Zulhadjri, Zulhadjri
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.463

Abstract

Synthesis of ferroelectric material based onAurivillius phases, (Ca0.5Ba0.5)Bi4Ti4O15 (CBBT), have been done using a molten salts technique.The results of X-ray diffraction (XRD) analysis showed the characteristic peaks at 2θ = 12.93°, 17.31°, 21.64°, 23.23°, 27.71°, 30.33°, and 32.90° which was correspond to the four-layers of Aurivillius phase.Refinement structure using the Le Bail method, the sample is suitable for orthorhombic structures with the A21am space group. The orthorhombicity of the CBBT is small and nearer to tetragonal symmetry.Fourier Transform Infra-red (FTIR) spectra show distortion of TiO6 octahedral at 847 cm-1 and strain vibrations of TiO6 octahedra at 545 cm-1 due to A-O bonds.Analysis using Scanning Electron Microscopy (SEM) shows the morphology of the sample in the form of plate-like which is characteristic of Aurivillius phase.The ferroelectric to paraelectric phase transition temperature (Tc) was obtained at 635ºC.The band gap value of the CBBT compound was 3.17 eV, relatively the same with the CaBi4Ti4O15 (CBT) compound.
Studi Pengaruh Rasio Mol Silika terhadap Titania dalam Pembentukan Koordinasi Titanium Tetrahedral dalam Silika-Titania dengan Metoda Solid State Yuliani, Amelinda; Veronita, Silvi; Pernadi, Niza Lian; Nizar, Umar Kalmar
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.117884

Abstract

Titanium tetrahedral coordination shows high activity as a catalyst so that it attracts attention to be researched and developed. In this study, tetrahedral titanium coordination was studied and produced through the Si-O-Ti bond between solid silica precursors and solid titania. Both precursors are mixed in toluene and sonicated for homogeneity. The resulted mixture was calcined at a temperature of 400oC for 8 hours and then characterized with DRS UV-Vis, XRD and FESEM. The results showed that the synthesis sample experienced an increase in tetrahedral titanium fraction from 27% to almost 34%. Characterization with XRD indicates that the diffraction pattern of the resulting sample is very similar to the titania precursor with a crystalline pattern with an anatase and rutile phases. The morphology of the resulting sample showed that silica samples that did not react with titania experienced agglomeration
Processing Used Cooking Oil into Economically Valuable Products as an Effort to Utilize Household Waste for the Istiqomah Majlis Taklim Women in Korong Olo Bangau Nagari Ketaping Batang Anai District Kurniawati, Desy; Dewata, Indang; Fadhilah, Fadhilah; Mulia, Melindra; Ningsih, Sherly Kasuma Warda; Veronita, Silvi; Marlini, Rahmida; Fatmawati, Rani
Pelita Eksakta Vol 8 No 2 (2025): Pelita Eksakta, Vol. 8, No. 2
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol8-iss2/315

Abstract

Nagari Ketaping in Batang Anai District has great potential for culinary tourism, especially through traditional fried snack vendors such as sala lauak. However, the extensive use of cooking oil in these activities leads to the generation of used cooking oil (jelantah), which poses serious health and environmental risks. Repeated use of the oil produces free radicals and carcinogenic substances that may cause degenerative diseases, while improper disposal into waterways leads to pollution and ecosystem damage. This community service program aims to educate and raise awareness among members of the majlis taklim in Nagari Ketaping about the dangers of used cooking oil and to demonstrate its potential for conversion into economically valuable products. The main participants are housewives who also operate small fried snack businesses. The outcomes include a scientific publication in Pelita Eksakta Journal (FMIPA UNP), a video documentation, and online media dissemination through Berita Minang.
Co-Authors Desy Kurniawati Fadhilah Fadhilah Fatmawati, Rani Indang Dewata Marlini, Rahmida Miftahul Khair Mulia, Melindra Nizar, Umar Kalmar Pernadi, Niza Lian Sherly Kasuma Warda Ningsih Upita Septiani Yuliani, Amelinda Zulhadjri Zulhadjri