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All Journal Jurnal Pengolahan Hasil Perikanan Indonesia VALENSI JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Materi Indonesia Jurnal Penelitian Hasil Hutan Jurnal Riset Kimia IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Indonesian Journal of Chemical Science Science and Technology Indonesia Al-Kimia Jurnal Kartika Kimia Jurnal Penelitian Hasil Hutan JURNAL REKAYASA KIMIA & LINGKUNGAN Jurnal Penelitian Hasil Hutan
Tetty Kemala
Departemen Kimia, FMIPA - IPB Kampus IPB Darmaga, Gedung Fakultas Peternakan, Bogor-16680
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Journal : VALENSI

 1 
Application of PAN/α-Fe2O3-Bentonite as A Photocatalytic Membrane for The Photodegradation of Methylene Blue Sitompul, Dina Wardani; Kemala, Tetty; Darmawan, Noviyan
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 9, No. 1, May 2023
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v9i1.28635

Abstract

The intricate molecular structure of the dyes in wastewater makes it difficult to biodegrade, which could harm the environment. Currently, semiconductor-based photocatalytic methods are being developed to remove dyes from water. In this study, the α-Fe2O3-bentonite photocatalyst was synthesized by mechanical milling and immobilized in polyacrylonitrile (PAN) membrane by phase inversion. Analysis of the composition and surface morphology of the synthesized samples was carried out by FTIR, XRD, and EDX. The performance of the photocatalytic membrane was studied by investigating the removal of methylene blue (MB). Photocatalytic membrane with 2% α-Fe2O3-bentonite had the best performance in removing MB (10 ppm) that reached 99.84% at pH 11.5 with an irradiation time of 300 minutes under direct sunlight. The reuse cycle of the photocatalytic membrane was also carried out and the results showed that there is no significant change in the photodegradation efficiency after 3 cycles. Photocatalyst immobilization on PAN membranes is proven to overcome the post-recovery problem of photocatalysts and making easier to reuse. The photocatalyst membrane synthesized in this study can be used as an alternative for removing dyes from water.
Modified Natural Rubber Based on the Sulphur Curing System as Rubber Compound Formulation on Basic Design of Seismic Bearing Cifriadi, Adi; Sugita, Purwantiningsih; Kemala, Tetty; Nikmatin, Siti; Puspitasari, Santi; Falaah, Asron Ferdian; Wijaya, Usman
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.39963

Abstract

Indonesia is highly susceptible to earthquakes, with the southern and western coasts of Java and Sumatra being the most vulnerable regions. Due to this vulnerability, it is necessary to establish a culture of disaster mitigation in the most fertile and heavily populated islands to reduce the number of fatalities and economic losses caused by earthquakes. One of the promising real-world seismic base isolation methods is using a rubber seismic bearing constructed of rubber and metal layers. This study aimed to examine the typical behavior of natural rubber compounds subjected to various sulfur-curing processes as basic designs in the manufacture of rubber seismic bearings. The experiment was carried out by arranging the sulfur curing system into three categories, namely an efficient which applied N-cyclohexyl-2-benzothiazole sulfonamide (CBS)/Sulfur (S) ratio as 1.4/0.15 and 1.4/0.25, semi-efficient with CBS/S ratio of 1.4/1.4 and 1.4/1.7, and conventional with CBS/S ratio of 1.4/3.0 and 1.4/3.5. The results showed that the ideal modification condition for NR macromolecule chain found in seismic-bearing rubber compound was a semi-efficient sulfur curing system with a CBS/S ratio of 1.4/1.4. It suggested that a semi-efficient sulfur curing system was appropriate for developing rubber compound formulation for seismic rubber bearings, mainly for low-damping types.
Modified Natural Rubber Based on the Sulphur Curing System as Rubber Compound Formulation on Basic Design of Seismic Bearing Cifriadi, Adi; Sugita, Purwantiningsih; Kemala, Tetty; Nikmatin, Siti; Puspitasari, Santi; Falaah, Asron Ferdian; Wijaya, Usman
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.39963

Abstract

Indonesia is highly susceptible to earthquakes, with the southern and western coasts of Java and Sumatra being the most vulnerable regions. Due to this vulnerability, it is necessary to establish a culture of disaster mitigation in the most fertile and heavily populated islands to reduce the number of fatalities and economic losses caused by earthquakes. One of the promising real-world seismic base isolation methods is using a rubber seismic bearing constructed of rubber and metal layers. This study aimed to examine the typical behavior of natural rubber compounds subjected to various sulfur-curing processes as basic designs in the manufacture of rubber seismic bearings. The experiment was carried out by arranging the sulfur curing system into three categories, namely an efficient which applied N-cyclohexyl-2-benzothiazole sulfonamide (CBS)/Sulfur (S) ratio as 1.4/0.15 and 1.4/0.25, semi-efficient with CBS/S ratio of 1.4/1.4 and 1.4/1.7, and conventional with CBS/S ratio of 1.4/3.0 and 1.4/3.5. The results showed that the ideal modification condition for NR macromolecule chain found in seismic-bearing rubber compound was a semi-efficient sulfur curing system with a CBS/S ratio of 1.4/1.4. It suggested that a semi-efficient sulfur curing system was appropriate for developing rubber compound formulation for seismic rubber bearings, mainly for low-damping types.
Co-Authors Achmad Sjahriza Adi Cifriadi Adi Cifriadi, Adi Afra Najiyah Amatullah Agus Malik Ibrahim Ahmad Sjahriza Aisy, Laaili Azti Rohaadatul Albarkah, Anita Maharani Aloma Karo Karo Amatullah, Afra Najiyah Andi Nursanti Anjarsari Anjarsari Ardiati, Fenny Clara Armi Wulanawati Asron Ferdian Falaah, Asron Ferdian Bakar, N.H.H Abu Budi Arifin Charlena Dede Heri Yuli YANTO Deden Saprudin Defrizal, Muhammad Finaldin, Muhammad Alhas Gustan Pari Gustan Pari Harahap, Muslim Arfanshah Hendra Adijuwana Henny Purwaningsih Ibrahim, Agus Malik Iqbal, Anwar Irma Herawati Suparto Karim, Wouda Fiorendita Kiagus Dahlan Komar Sutriah M. Syaeful Fahmi Mardiana Hardianti Mohammad Khotib Nada, Nida Kotrun Naser, Inda Hastuti N Nina Hartati Nor Pana Yupa Noviyan Darmawan Nur Inayatullah Nurhayat, Oktan Dwi Obie Farobie Permana, Ifri Surya Pipih Suptijah Prakoso, Mochamad Galih Purwantiningsih Sugita Purwantiningsih Sugita Ravena Ravena Santi Puspitasari Siti Komariah Siti Nikmatin Sitompul, Dina Wardani Soebrata, Betty Marita Sudirman Sudirman Suminar S. Achmadi Suryanegara, Lisman Susi Nurdayat Tun Tedja Irawadi Tun Tedja Irawadi