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All Journal POSITRON Jurnal Teknologi Reaktor Nuklir Tri Dasa Mega Jurnal Fisika FLUX Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Jurnal Pengabdian Ilung (Inovasi Lahan Basah Unggul) Lontar Physics Today Jurnal Natural Scientiae International Journal of Renewable Energy Development
Manik, Tetti Novalina
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Perluasan Kinerja Akustik Limbah Kayu Batang Kelapa Sawit Termodifikasi Bahan Formaldehida Manik, Tetti Novalina; Shaliha, Shaliha; Siregar, Simon Sadok; Santoso, Tanto Budi; Yahya, Iwan; Mashuri, Mashuri; Zainuri, Muhammad; Darminto, Darminto
POSITRON Vol 12, No 2 (2022): Vol. 12 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (442.893 KB) | DOI: 10.26418/positron.v12i2.55963

Abstract

Chemical modifications for waste oil palm trunks had carried out as acoustic material. This modification was conducted in two stages. Firstly, formalization with formaldehyde solution and secondly is impregnation with melamine-formaldehyde resin. Formalization was conducted in alkaline condition (pH 10) for 3 days and 5 days. Impregnation was carried out under pressure 3 bar and 5 bar and held for an hour. For completed these modification, the samples was cured at 120oC for 10 minutes and then dried at (103±2)oC to reached moisture content of less than 6%. This modification has changed the chemical structure and the morphology of wood, as shown by the FTIR and SEM results. The samples became denser, stronger and more rigid. Furthermore, the mechanical and physical properties of modified wood are also increasing. The absorption coefficient decreases with increasing formalization time and impregnation pressure. Based on trend of absorption coefficient, BKS wood can be applicated as resonant absorber with work class from A to class B and D.
Synthesis of CdS Nanoparticles Using The Brimstone Suryajaya, Suryajaya; Safitri, Ayu; Suarso, Eka; Haryanti, Ninis Hadi; Manik, Tetti Novalina; Darminto, Darminto
POSITRON Vol 14, No 2 (2024): Vol. 14 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i2.77273

Abstract

This paper explains and demonstrates how to synthesize Cadmium Sulphide (CdS) nanoparticles (NPs) using brimstone. The brimstone is obtained from Ijen volcanic crater in East Java Indonesia and used as the source of sulfur gas (S2) instead of Na2S. The brimstone was crushed and dissolved in potassium hydroxide (KOH) solution while heated. Acetic acid (CH3COOH) was added, to release the S2 gas. The liquid-gas method was used to prepare the CdS colloid solution. In this study, the effect of variations in the concentration and volume of CH3COOH, temperature variation, and exposure time on the synthesis of colloidal solutions of CdS NPs will be investigated. The absorption edge of the CdS colloidal solution compared to the bulk material experienced a blue shift. This is the evidence of the formation of NPs in solution. It is confirmed by FTIR which shows a CdS absorption peak at 467 cm-1. The radius of CdS NPs was calculated using the Efros equation to obtain a result of approximately 2 nm. Particle size analyzer (PSA) provides a much larger particle size of 20.8 nm. It is assumed that the NPs were agglomerated. Several treatments given, such as varying the volume of CH3COOH, varying temperature, stirring, and varying synthesis time, did not affect the size of the NPs.  The cadmium sulfide produced would be used as photocatalist in water treatment application.
Co-Authors Akbar, Arief Rahmad Maulana Anny Sulaswatty, Anny Ayu, Futri Az Zahra, Aisyah Nur Budi Kristanto Darminto . Dewi Sri Susanti Dzikri, Dzikri Egi Agustian Erdiansyah Rezamela, Erdiansyah Fahruddin Fahruddin Gusti Atika Urfa Hafiizh Prasetia, Hafiizh Hendris Hendarsyah Kurniawan, Hendris Hendarsyah Hindarto, Imam Ibrahim Ibrahim Ida Ayu Putu Sri Widnyani Iwan Yahya Khayanti, Yuni Sri Krisdianto Sugiyanto Mashuri Mashuri Meilina, Putri Muhammad Zainuri Nasrulloh, Amar Vijai Ninis Hadi Haryanti, Ninis Hadi Nova Annisa, Nova Oni Soesanto Purba, Santi Carolina Rahmat Eko Sanjaya Rahmat Yunus Ramadhoni, Benni F Rasjava, Achmad Ramadhanna'il Santoso, Tanto Budi Saputra, Yoga Sembiring, Rinawati Shaliha, Shaliha Simon Sadok Siregar, Simon Sadok Sri Cahyo Wahyono Suarso, Eka Sudarningsih Sudarningsih Sudarningsih, Rusdiansyah Suryajaya Suryajaya, Suryajaya Susilo, Tanto Budi Sutomo Sutomo Thresye Thresye Thresye,, Thresye, Totok Wianto Yuyun Hidayat