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All Journal Indonesian Journal of Chemistry JURNAL REKAYASA KIMIA & LINGKUNGAN Helium: Journal of Science and Applied Chemistry
Arlofa, Nina
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology

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Innovative High-Speed Homogenizer Approach for Synthesizing PVDF-GO Membranes from Recycled Battery Graphite Febriasari, Arifina; Ferdiansyah, Ferry; Salsabila, Shafa Marwa; Ridwan, Muhammad; Mahardika, Muhammad Bagas Adhistya; Hilyati, Hilyati; Sudjarwo, Wisnu Arfian Anditya; Arlofa, Nina; Supriyadi, Supriyadi; Toca-Herrera, Jose Luis; Kartohardjono, Sutrasno
Indonesian Journal of Chemistry Vol 25, No 5 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.103909

Abstract

Effective waste management is essential for achieving a zero-waste environment, particularly in handling hazardous domestic waste like used dry cell batteries. This study explores a sustainable approach by recovering graphite from battery waste to synthesize graphene oxide (GO) for enhancing poly-vinylidene fluoride (PVDF) membranes. GO was synthesized using the Hummers method and a modified high-speed homogenization approach, then characterized via Raman spectroscopy and X-ray diffraction (XRD). The fabricated PVDF-GO membranes were further analyzed using SEM-EDS, AFM, water contact angle measurements, and bacterial rejection tests. Results confirmed successful GO synthesis and integration into the polymer matrix. GO incorporation improved hydrophilicity, reducing the water contact angle from 120° (pure PVDF) to 66° and 56° in PVDF/PVP-GO membranes via high-speed homogenization and conventional methods, respectively. The modified membranes exhibited a 5–6 times larger pore size than pure PVDF and achieved nearly 100% bacterial rejection. Additionally, PVDF/PVP-GO(h) showed a 91.76% faster production time efficiency than PVDF/PVP-GO(s).
Effectiveness of Durian Peel Extract as A Natural Anti-Bacterial Agent Arlofa, Nina; Ismiyati, Ismiyati; Kosasih, Muhammad; Fitriyah, Nurul H.
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 2 (2019): Jurnal Rekayasa Kimia & Lingkungan (December, 2019)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v14i2.14275

Abstract

Durian (durio zibertinus) is a native tropical fruit from Southeast Asia, especially Indonesia. Durian peel is the highest composition of durian fruit (60-75%), and is still considered as waste that causes environmental problems. This study aimed to analyze the content of secondary metabolites extract, to analyze the anti-bacterial activity of durian peel extract against gram-negative and gram-positive bacteria, and to calculate the effectiveness of durian skin durian peel extract as a natural anti-bacterial ingredient in hand sanitizer products by using the paper disc method. Durian peel was extracted with ethanol to obtain extract solution which was then separated from the solvent and applied as an ingredient for hand sanitizer. The Analysis results showed that durian peel extract contains triterpenoids, alkaloids, and saponins, which are phytochemical compounds that anti-bacterial function. Durian peel extract at concentration of 1% wt. inhibited the growth of Escherichia coli, Salmonella thyposa and Sthapylococcus aureus with a clear zone diameters of 7.4 mm, 8.2 mm and 8.6 mm, respectively. In anti-septic tests, hand sanitizer samples containing durian peel extract showed that the interaction between the concentration of durian peel extract and the sampling duration simultaneously gave a significant effect in reducing the number of microorganism colonies.
Combination of Coagulation and Fermentation Technology in Utilizing Liquid Tofu Waste into Liquid Organic Fertilizer for the Growth of Chinese Spinach (Amaranthus dubius) Plants Arlofa, Nina; Kusuma , Dama Satya; Nugraha , Dwiyan Arya; Laksana , Mochammad Rizal
Helium: Journal of Science and Applied Chemistry Vol. 5 No. 1 (2025): Helium: Journal of Science and Applied Chemistry
Publisher : Study Program of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/helium.v5i1.20

Abstract

Wastewater is known to contain organic compounds, such as proteins, fats, and carbohydrates, which can be utilized more effectively through technology, coagulation, and fermentation, allowing it to be used as an organic liquid fertilizer (OLF), a more environmentally friendly option. Research objectives are to determine the influence of powder seed sour Java as a coagulant on lower COD and BOD levels, the effect of adding EM4 to nutrients in waste liquid, and the impact of POC on the growth of spinach China (Amaranthus dubius). This research is conducted through the process of coagulation and flocculation using a solution seed powder of sour Java with varying concentrations of 500, 1000, 1500, 2000, and 2500 ppm. The concentration of 1500 ppm has resulted in the lowest COD and BOD levels, respectively, 250 ppm and 127 ppm. The solution with the lowest COD and BOD levels is fermented using EM4 with variations of 0, 0.5, 1, 1.5, and 2mL. The addition of EM4 is expected to accelerate the fermentation process and enhance the availability of beneficial nutrients, including N, P, and K, for plant growth and development. The total content of N, P, and K is highest, at 2.087%, following the addition of 1 mL of EM4 to 150 mL of the sample. POC with the addition of 1 mL of EM4 was applied to the spinach plant in China, resulting in a plant 25 cm tall, with nine leaves, and a total fresh weight of 39 grams.
Co-Authors Febriasari, Arifina Ferry Ferdiansyah, Ferry Fitriyah, Nurul H. Hilyati Hilyati Ismiyati, Ismiyati Kosasih, Muhammad Kusuma , Dama Satya Laksana , Mochammad Rizal Mahardika, Muhammad Bagas Adhistya Muhammad Ridwan Nugraha , Dwiyan Arya Salsabila, Shafa Marwa Sudjarwo, Wisnu Arfian Anditya Supriyadi Supriyadi Sutrasno Kartohardjono Toca-Herrera, Jose Luis