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All Journal Natural Science: Journal of Science and Technology Journal of The Physical Society of Indonesia
Khaeroni, Rany
UNIVERSITAS TADULAKO
Computer Science & IT Physics

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PEMURNIAN DAN KARAKTERISASI SILIKA MENGGUNAKAN METODE PURIFIKASI (LEACHING) DENGAN VARIASI WAKTU MILLING PADA PASIR KUARSA DESA PASIR PUTIH KECAMATAN PAMONA SELATAN KABUPATEN POSO Darwis, Darmawati; Khaeroni, Rany; Iqbal, Iqbal
Natural Science: Journal of Science and Technology Vol 6, No 2 (2017): Volume 6 Number 2 (August 2017)
Publisher : Univ. Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (461.925 KB)

Abstract

Penelitian tentang pemurnian dan karakterisasi silika pada pasir kuarsa Desa Pasir Putih Kecamatan Pamona Selatan Kabupaten Poso telah dilakukan. Penelitian ini bertujuan untuk memperoleh kadar kemurnian silika (SiO2) yang tinggi menggunakan metode purifikasi (leaching) dengan variasi waktu milling selama 2-5 jam. Sebelum pemurnian, pasir kuarsa dihaluskan dengan menggunakan ball milling. Selanjutnya direndam dalam larutan HCl 2 M selama 12 jam lalu dibersihkan dengan aquades hingga pH netral. Sesudah itu, setiap sampel dikarakterisasi menggunakan alat XRF dan XRD. Dari hasil karakterisasi XRF diperoleh kadar kemurnian silika tertinggi terdapat pada sampel dengan waktu milling 5 jam (99,90%). Kemudian hasil karakterisasi XRD pada sampel tersebut memiliki struktur kristal dengan sistem kristal hexagonal,  yang meliputi jarak bidang difraksi, konstanta kisi, dan derajat kristalin ketika dicocokkan dengan software Search Match dan data JCPDS ialah berturut- turut 3,35 ?, a = b = d = 4,90 ?, c = 5,44 ?, dan 80,11%.
Absorbance Characteristics of Chlorophyll Extracts of Spinach (Amaranthus Hybridus & Amaranthus tricolor) and Water spinach (Ipomea spp.) as Sensitizers Iqbal, Iqbal; Basri, Zainuddin; Adyatma, Abyudan; Khaeroni, Rany; Darwis, Darmawati
Journal of the Physical Society of Indonesia Vol. 1 No. 2 (2025): October 2025
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.1.2.145-154.2025

Abstract

The development of dyes has moved from natural sources, such as minerals, plants, and animals, to synthetic substitutes since the discovery of mauveine in 1856. The industrial revolution has changed the way dyes are made and sparked environmental concerns, which has led to a renewed interest in natural colors for food, cosmetics, and textiles. In dye-sensitized solar cells (DSSCs), the potential of chlorophyll extracts from water spinach (Ipomoea spp.) and spinach (Amaranthus tricolor) as long-lasting photosensitizers is investigated in this work. Amaranthus tricolor has a high total chlorophyll content of 10.367 mg/g, which is made up of 9.551 mg/g of chlorophyll and 0.818 mg/g of chlorophyll b, according to a chlorophyll content analysis. Significant amounts of chlorophyll were also present in Amaranthus hybridus, which had 10.462 mg/g (9.181 mg/g of chlorophyll and 1.283 mg/g of chlorophyll b). Ipomoea species, on the other hand, had a lower chlorophyll concentration (5.380 mg/g). Significant absorption peaks were found in the 380–460 nm range by acetone extraction and UV–Vis spectrophotometry, highlighting the significance of efficient light absorption for photosynthesis. Amaranthus tricolor is a very ideal plant for distributed solar power system applications due to its exceptional light energy conversion performance. But during storage, environmental stressors including senescence and light intensity caused chlorophyll to degrade, which shifted the absorbance maxima to shorter wavelengths and decreased the efficiency of light absorption. Amaranthus tricolor, in spite of this, continues to be a viable option for environmentally benign natural chlorophyll alternatives for industrial and renewable energy applications.
Co-Authors Adyatma, Abyudan Darmawati Darwis Iqbal Iqbal Zainuddin Basri