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Riri Jonuarti
Universitas Negeri Padang
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Journal : Journal of Experimental and Applied Physics

 1 
Structure Analysis Of Fe3O4-Graphene Oxide Nanocomposite From Corn Cob Waste Ismira, Ismira; Hidayat, Rahmat; Ratnawulan, Ratnawulan; Jonuarti, Riri
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.59

Abstract

This research is a study of the structure of nanocomposites whose composition is varied between Fe3O4 and Graphene Oxide. The purpose of this study is to determine the structure of Fe3O4-Graphene Oxide nanocomposites from corn cob waste. This type of research is experimental research, which begins with sample preparation from corn cob waste, carbon activation, graphene oxide synthesis, sonication and neutralization of graphene oxide, and synthesis of Fe3O4-Graphene Oxide nanocomposites using the ball milling method by varying the composition. Crystal size and structure were characterized by XRD, functional groups were characterized by FTIR, surface morphology, particle size and porosity were characterized by SEM. The results of the research on the structure of Fe3O4-Graphene Oxide nanocomposites from corn cob waste, obtained XRD results show that the crystal structure is Hexagonal, Cubic, and Orthorhombic with the average crystal size of the best Fe3O4-Graphene Oxide composition variation at 30%: 70% composition, because the particle size produced is quite small from other composition variations, namely 39.19 nm. FTIR results show that all compositional variation comparisons have C-H, O-H, C≡C, C=O, C=C, C-O, and Fe-O bond functional groups. SEM results show the morphology of Fe3O4 is spherical, while the morphology of graphene oxide is in the form of chunks. The particle size value gets smaller as the Fe3O4 composition increases, because the more Fe3O4 composition causes the surface of the graphene oxide particles covered to get bigger. In addition, particle size can also affect the porosity of nanocomposites, the smaller particle size can increase porosity because more particles can occupy space.
Effect of The Camposition Nanocomposite Fe3O4-Graphene Oxide on Optical Properties Synthesized from Coconut Shell Charcoal Angraini, Sri; Gusnedi, Gusnedi; Jonuarti, Riri; Jhora, Fadhila Ulfa
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.60

Abstract

This study aims to determine the effect of Fe3O4 nanocomposite composition: Graphene Oxide on the optical properties of Fe3O4 Graphene Oxide nanocomposite by obtaining the results of absorbance value, transmittance, reflectance, and band gap value based on UV-Vis test. Graphene oxide used in this study is made from biomass waste coconut shell charcoal which contains carbon elements, most of whose pores are still covered by hydrocarbons and other organic compounds and the charcoal is used as activated carbon through an activation process, then synthesized using the modified hummers method. In this study, three variations were used, namely 20%: 80%; 30%; 70%; 40%: The results show that the effect of Fe3O4-Graphene Oxide Nanocomposite Composition on coconut shell waste using a UV-Vis spectrometer, the absorbance value of each sample was obtained in the range of 200-290 nm.. In the results of gap energy research with 3 variations respectively 3.269 eV, 3.79 eV, 3.91 eV obtained that if the variation of graphene oxide is higher than the value of the energy gap produced is smaller, so the addition of graphene oxide from coconut shell waste has the effect of reducing the energy gap of graphene oxide.
Effect of Calcination Temperature of SiO2-TiO2 Composite XRD Characterization of Crystal Size Structure and Phase Putri, Sri Fany Mulya; Ratnawulan, Ratnawulan; Gusnedi, Gusnedi; Jonuarti, Riri
Journal of Experimental and Applied Physics Vol 2 No 3 (2024): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i3.65

Abstract

Calcination is often used to activate beneficial metal oxidation in catalysts and improve material stability. In the metal oxidation research used is SiO2-TiO2 nanocomposite because it has advantages over photocatalysts and thermal stability. One important factor that affects is the particle size and crystal phase formed during the calcination process at various temperatures. The purpose of the study was to determine the effect of calcination on changes in phase and crystal structure in SiO2-TiO2 nanocomposites. The material used for the manufacture of nanocomposites is natural silica source from coconut fiber which is burned into white ash. The ash was extracted for the preparation of silica sol by adding Tetraethyl Orthosilicate (TEOS) as a precursor synthesized by the sol gel method then, calcination was carried out with temperature variations of 700 , 800 , and 900 . After calcination, XRD characterization was carried out to obtain crystal sizes of 63.48 nm, 66.87 nm, and 73.83 nm. The phase formed is dominant in TiO2 is rutile and SiO2 is quartz and cristobalite.
Optical Characteristics Of Nano-Talc/TiO2 Thin Layer ; A Preliminary Study Vitrini, Nora; Jonuarti, Riri; Ratnawulan; Hidayat, Rahmat
Journal of Experimental and Applied Physics Vol 2 No 4 (2024): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i4.81

Abstract

This study tested the effect of 50%:50% concentration nano-Talc/TiO2 on optical and photocatalytic properties thin layer activity. The goal is to understand how 50%:50% concentration affects absorption, reflection and transmission as as well as photocatalytic activity of thin layer. This research is experimental, starting with grinding Talc and TiO2, followed by dilution layer synthesis using the spin coat technique. Characterization includes cross-section morphology analysis using SEM, absorption, reflection, transmission and energy measurements slit with a UV-Vis DR spectroscope, as well as photocatalytic activity test. The research results show that the coating process managed to increase absorption by (92-98)% and energy band gap of 2.93 eV while reflection and transmission are reduced by (0.5-4)%, as well as the lowest rate of photocatalytic activity degradation rate of 0%, causing low ROS under light sunlight protective layer.
Analysis of Raw Natural Montmorillonite (MMT) from Marapi Volcanic Ash and Its Potential as an Adsorbent Nawiyah, Nawiyah; Jonuarti, Riri; Darvina, Yenni; Hidayat, Rahmat; Syafri, Syafri
Journal of Experimental and Applied Physics Vol 3 No 1 (2025): March Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i1.95

Abstract

Volcanic ash consists of fine particles that are ejected into the atmosphere during an eruption of a volcano. The volcanic ash that will be tested in this study comes from the Aia Angek area of West Sumatra, which erupted in December 2023 to February 2024. The goal of this research was to assess the quantity of montmorillonite found in the volcanic ash originating from Marapi. In order to reach this objective, various examinations were conducted for characterization utilizing XRF, XRD, FTIR and SEM. The XRF data results show that the largest montmorillonite elements in volcanic ash are SiO2 dan Al2O3. The XRD test results show that there are 6 types of montmorillonite contained in Marapi volcanic ash, namely Chlorite-vermiculite-montmorillonite, Montmorillonite (Clay), Illite-Montmorillonite regular, Monmorillonite, Montmorillonite 15-A and Montmorillonite heated. The FTIR test results show that the peak band 3669-467/cm contains the chemical composition of montmorillonite. Based on the SEM test analysis, it shows the morphology of montmorillonite from Marapi volcanic ash with a particle size of 301,9 nm and a porosity size of 151,6 nm. Thus, based on the results of the five characterizations carried out, it is known that the Marapi volcanic ash does contain complex montmorillonite.
Co-Authors AA Sudharmawan, AA Afrilla, Sonya Ambran Hartono Angraini, Sri Arni Sopianti Azzahra, Zakia Cahyaningrum, Wahyu Desti Yuspita Sari Doni, Monica Anatasya Fadhila Ulfa Jhora Fanny Rahmatina Rahim Fatni Mufit Fuad Sofaturahman Gusnedi Gusnedi Gusnedi, - Hidayati Hidayati Hidayati Hidayati Intan Purnama Yani Ismira, Ismira Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Kasih Syirpia Lia Rifka Septiana Maharani, M Maritza Syalsabilla Masni Yanti, Meri Melisa Putri Mira Syuriyani Nadia Raisa Aryani Nawiyah, Nawiyah Pertama, Indri Saputri Putri, Sri Fany Mulya Rahmadani, Tika Rahmat Hidayat Rahmat Hidayat Raisa, Nadia Ramli Ramli Ratna Wulan Ratnawulan Ratnawulan . Rifka, Lia Rita Iranie Salsabilla, Salsabilla Sofaturrohman, Fuad Syafika, Herma Syafri, Syafri Syalsabilla, Maritza Syuriyani, Mira Ulfa Jhora, Fadhila Ulfa Jhora, Fadila Vitrini, Nora Wardatul Ullya Yenni Darvina Yohandri Bow Yuliana, Yuli Yuliani, Kurnia Dwi Yulifarma, Rika Yuliza Noerman, Kiki Yurnetti, Yurnetti Zahra, Hayatun Nufus