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All Journal International Journal of Renewable Energy Development Jurnal Matematika Sains dan Teknologi International Journal of Renewable Energy Development
Athanasia Amanda Septevani, Athanasia Amanda
Kelompok Kimia Polimer, Pusat Penelitian Kimia, LIPI
Agriculture, Biological Sciences & Forestry Chemistry Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Mathematics Other

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RASIO PATI SINGKONG DAN ASAM AKRILAT TERHADAP KAPASITAS ABSORBSI PADA SINTESIS KOMPOSIT POLIMER SUPERABSORBAN Fika, Weni; Kasim, Anwar; Novelina, Novelina; Septevani, Athanasia Amanda
Jurnal Matematika Sains dan Teknologi Vol 20 No 2 (2019)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/jmst.v20i2.963.2019

Abstract

This study aimed to synthesize a superabsorbent polymer composite based on a natural polymer that has been made by grafting method using cassava starch as a backbone (main framework), Acrylic acid (AA) as a monomer, Ammonium persulfate (APS) as an initiator and N,N Methylene bisacrylamide (MBA) as a crosslinker. The effect of the ratio of cassava starch and acrylic acid (25 : 75; 50 : 50 and 75 : 25% weight total) has been studied based on absorption capacity. The chemical structure that occurs is analyzed using Fourier Transform Infra-red (FTIR) spectroscopy. The results of the FTIR spectrum showed that the grafting of acrylic acid to starch occurred. In the ratio of starch to acrylic acid 25 : 75% of the weight total obtained the maximum water absorption ability (absorption capacity) 224 g/g in aquades and 25 g/g in 0,9% NaCl solution. Tujuan dari penelitian ini adalah untuk mensintesis komposit polimer superabsorban berbasis polimer alam yang telah dibuat dengan metode grafting (pencangkokan) yang menggunakan pati singkong sebagai backbone (kerangka utama), asam akrilat (AA) sebagai monomer, Ammonium persulfat (APS) sebagai inisiator dan N,N Metilen bisakrilamida (MBA) sebagai crosslinker. Pengaruh rasio pati singkong dan asam akrilat (25 : 75; 50 : 50 dan 75 : 25% berat total) telah dipelajari berdasarkan kapasitas absorbsi. Struktur kimia yang terjadi dianalisa menggunakan spektroskopi Fourier Transform Infra-red (FTIR). Hasil dari spektrum FTIR memperlihatkan bahwa terjadinya grafting asam akrilat terhadap pati. Pada rasio pati dengan asam akrilat 25 : 75% berat total diperoleh kemampuan menyerap air (kapasitas absorbsi) maksimum 224 g/g dalam aquades dan 25 g/g dalam larutan NaCl 0,9%.
Outstanding Photo-bioelectrochemical Cell by Integrating TiO2 and Chlorophyll as Photo-bioanode for Sustainable Energy Generation Christwardana, Marcelinus; Septevani, Athanasia Amanda; Yoshi, Linda Aliffia
International Journal of Renewable Energy Development Vol 11, No 2 (2022): May 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.41722

Abstract

Photosynthesis is a technique for converting light energy into chemical energy that is both efficient and sustainable. Chlorophyll in energy-transducing photosynthetic organisms is unique because of their distinctive structure and composition. In photo-bioelectrochemical research, the chlorophyll's quantum trapping efficiency is attractive. Chlorophyll from Spirulina platensis is demonstrated to communicate directly with TiO2-modified Indium Thin Oxide (ITO) to generate electricity without the use of any mediator. TiO2-modified ITO with a chlorophyll concentration of 100 % generated the greatest power density and photocurrent of approximately 178.15 mW/m2 and 596.92 mA/m2 from water oxidation under light among all the other materials. While the sensitivity with light was 0.885 mA/m2.lux, and Jmax value was 1085 mA/m2. Furthermore, the power and photocurrent density as a function of chlorophyll content are studied. The polarizability and Van der Waals interaction of TiO2 and chlorophyll are crucial in enhancing electron transport in photo-bioelectrochemical systems. As a result, this anode structure has the potential to be improved and used to generate even more energy.
Starch – carrageenan based low-cost membrane permeability characteristic and its application for yeast microbial fuel cells Christwardana, Marcelinus; Kuntolaksono, Satrio; Septevani, Athanasia Amanda; Hadiyanto, H
International Journal of Renewable Energy Development Vol 13, No 2 (2024): March 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.59160

Abstract

Microbial fuel cells (MFCs) are an innovative method that generates sustainable electricity by exploiting the metabolic processes of microorganisms. The membrane that divides the anode and cathode chambers is an important component of MFCs. Commercially available membranes, such as Nafion, are both costly, not sustainable, and harmful to the environment. In this study, a low-cost alternative membrane for MFCs based on a starch-carrageenan blend (SCB-LCM) was synthesized. The SCB-LCM membrane was created by combining starch and carrageenan and demonstrated a high dehydration rate of 98.87 % over six hours. SEM analysis revealed a smooth surface morphology with no pores on the membrane surface. The performance of SCB-LCM membrane-based MFCs was evaluated and compared to that of other membranes, including Nafion 117 and Nafion 212. All membranes tested over 25 hours lost significant weight, with SCB-LCM losing the least. The maximum power density (MPD) of the SCB-LCM MFCs was 15.77 ± 4.34 mW/m2, indicating comparable performance to commercial membranes. Moreover, the cost-to-power ratio for MFCs employing SCB-LCM was the lowest (0.03 USD.m2/mW) when compared to other membranes, indicating that SCB-LCM might be a viable and cost-effective alternative to Nafion in MFCs. These SCB-LCM findings lay the groundwork for future research into low-cost and sustainable membrane for MFC technologies.  
Co-Authors Anwar Kasim Fika, Weni H Hadiyanto Heni Pujiastuti Linda Aliffia Yoshi, Linda Aliffia Marcelinus Christwardana Satrio Kuntolaksono