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All Journal VALENSI Alchemy : Journal of Chemistry Sains Natural: Journal of Biology and Chemistry QARDHUL HASAN: MEDIA PENGABDIAN KEPADA MASYARAKAT Journal of Science Innovare EKOLOGIA : Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup JKPK (Jurnal Kimia dan Pendidikan Kimia) Makara Journal of Science Helium: Journal of Science and Applied Chemistry al Kimiya : Jurnal Ilmu Kimia dan Terapan Jurnal Pengabdian Masyarakat Inovatif Jurnal Pengabdian Masyarakat Inovatif
Linda Jati Kusumawardani
Universitas Pakuan
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Social Sciences Other

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Journal : Makara Journal of Science

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Modification of Zeolite Made from Coal Fly Ash with TiO2: Effect of Aging Time on Physical and Optical Properties Kusumawardani, Linda Jati; Iryani, Ani; Sinaga, Ennita Lusiana
Makara Journal of Science Vol. 27, No. 1
Publisher : UI Scholars Hub

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Abstract

The high levels of metal oxides, SiO2, and Al2O3 give coal fly ash the potential for development into zeolite. Zeolite was prepared from fly ash by combining alkaline fusion with hydrothermal treatment. Using this method results in a high surface area, high mechanical properties, and high crystallinity of the sample. Zeolite as a product is modified by TiO2. This study was intended to determine the effect of the operating process in zeolite synthesis from coal fly ash on the types and properties of zeolite and the effect of the aging time of TiO2-modified zeolite at 14, 16, and 20 h. Investigating its physical and optical properties shows that the product contains zeolite X as the major phase. The zeolite X itself contains 96% crystallinity and a specific surface area of 164.78 m2/g. Meanwhile, TiO2/zeolite increases the light absorption in the visible region. Diffuse reflectance spectroscopy showed that a 14 h aging time results in the lowest band gap energy of 2.50 eV and the largest surface area of 189.483 m2/g. X-ray diffraction characterization found that TiO2/zeolite is an anatase crystal (~9 nm) with 99% crystallinity. A pilot examination of the photodegradation performance of the TiO2/zeolite nanocomposite was evaluated using 5 mg/L methylene blue and compared with that of zeolite alone.
The Quality of Bio-pellets Made by Combining Walnut Kernel Shells (Canarium Indicum L.) from Bogor, Indonesia, and Palm Kernel Shells as Renewable Energy Iryani, Ani; Kusumawardani, Linda Jati; Juniansyah, Ronaldo
Makara Journal of Science Vol. 29, No. 3
Publisher : UI Scholars Hub

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Abstract

Using biomass as an energy source helps overcome the declining supply of fossil fuels. Bio-pellets—an energy product made from biomass—is one option that can be utilized. One source of biomass energy is walnut kernel shells. The walnut plant (Canarium indicum L.) is a forest tree grown in eastern Indonesia. The walnut plant is also located in the GOR Pajajaran area of Bogor City and has not been utilized for energy production. This study consists of three stages: 1) raw material preparation, 2) bio-pellet production, and 3) bio-pellet characterization in accordance with the Indonesian National Standard (SNI) 8951:2020. Based on the results of our study, bio-pellets made from 100% walnut kernel shells can be utilized as fuel, with a calorific value of 4,593 cal/g. Although the moisture content remains high, the calorific value still meets the standard for power plants according to SNI 8951:2020. In addition, palm kernel shells can improve the quality of bio-pellet products. The combination of 30% walnut kernel shells and 70% palm kernel shells improves calorific value, with the following specifications: 4,684.4 cal/g of calorific value, 8.83% moisture content, 1.85% ash content, 69.16% volatile materials, 19.30% fixed carbon, 0.02% sulfur content, and 1.18% bulk density.
Co-Authors . Apriansyah Ade Heri Mulyati, Ade Heri Ani Iryani Apriyanti, Mahyuni Ariq, Muhammad Rizki Cellia Christiana Batubara Damayanti, Elok Diana Widiastuti Fauziah, Zahra Nur Hermawan, Ujang Indah, Amalia Nurul Irma Anggraeni Iryani, Ani Ivandini Tribidasari Anggraningrum Jarnuzi Gunlazuardi Juniansyah, Ronaldo Leny Heliawati Maharani, Khairy Yunda Muhammad Fathurrahman Muhammad Rizki Saputra, Muhammad Rizki Nurlela Nurlela Prakoso, Muhamad Iqbal Shinta Safitri Sinaga, Ennita Lusiana Siti Warnasih Sutanto Sutanto Sutanto Sutanto Uswatun Hasanah Widdyanti, Tutik Yulian Syahputri