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All Journal Konversi Indonesian Journal of Chemistry Jurnal Chemurgy
Puspasari, Febriyati
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Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Education Energy Engineering Environmental Science

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Conversion of waste polypropilene (pp) using the zeolite Ni/ZSM-5 to liquid fuel Thahir, Ramli; Kusuma, Imam Fatwa; Aprilia, Nursyam; Alam, Ahmad Noor; Halim, Abd; Alwathan, Alwathan; Marlinda, Marlinda; Kurniawan, Andri; Puspasari, Febriyati; Rahman, Abdul; Irwan, Muh
Konversi Vol 12, No 2 (2023): OKTOBER 2023
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v12i2.15972

Abstract

Fuel oil from plastic waste is a promising alternative fuel because of its carbon chaincharacteristics and physical properties which is similar to the crude oil. In addition, the demand for plastic is still increasing which eventually becomes plastic waste. The aim of this study was to determine the quality and application of liqui0d oil produced by pyrolysis catalytic cracking assisted Ni/ZSM-5 from polypropylene (PP) plastic waste. The obtained products were liquid, gas, and char. The optimal yield of fuel oil at 390oC was 239 ml of fuel oil/250 g of PP with a conversion of 79.20 %,wt (72%, liquid and 7.20% gas) and the remaining product was char. The characteristics of the fuel oil products are in the range of gasoline and kerosene fuel types. The average yield value of oAPI in the range of 51-42 for kerosene-type fuel in trays 1 and 2. Furthermore, gasoline-type fuel was resulted in trays 3 and 4 with oAPI value in the range of 52-63.
Synthesis of Fe3O4/Hydroxyapatite Nanocomposites: Structural, Surface, and Magnetic Characterization Fadli, Ahmad; Prabowo, Agung; Drastinawati, Drastinawati; Wandika Putra, Bima; Sugesti, Heni; Puspasari, Febriyati
Indonesian Journal of Chemistry Vol 26, No 2 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.107697

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Magnetite/hydroxyapatite (Fe3O4/HA) nanocomposites are promising materials for biomedical applications, particularly in targeted drug delivery. This study investigates the effects of hydrothermal reaction time and FeCl3 precursor concentration on the structural, morphological, and magnetic properties of Fe3O4/HA composite powders synthesized via a one-pot hydrothermal method. The resulting composites exhibit biphasic structures comprising magnetite (cubic phase) and hydroxyapatite (hexagonal phase) crystallites, with average sizes ranging from 22 to 30 nm. Both increased reaction time and FeCl3 concentration contributed to the growth of crystal size. A notable enhancement in specific surface area was observed, increasing from 48.21 to 67.41 m2/g as FeCl3 concentration decreased from 0.15 to 0.05 M at a fixed reaction time of 15 h. Magnetic characterization revealed that the composites exhibited superparamagnetic behavior, with the highest saturation magnetization (Ms) reaching 17.27 emu/g. These results demonstrate that tuning synthesis parameters can optimize the structural and magnetic properties of Fe3O4/HA nanocomposites, making them strong candidates for use in controlled drug delivery systems.
POLYMERIZATION OF AGAR JELLY ICE CUBE HYDROGEL FROM GRACILARIA SP. SEAWEED EXTRACT THROUGH PHYSICAL GELATION AS AN ALTERNATIVE FOOD COOLING MEDIA Puspasari, Febriyati; Mustafa, Mustafa; Al Athaya, Muhammad Zada
Jurnal Chemurgy Vol 10, No 1 (2026): Jurnal Chemurgy-Juni 2026
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/cmg.v10i1.26238

Abstract

The suboptimal utilization of seaweed has the potential to cause environmental impacts and low added value for coastal communities, while the food industry still relies on conventional cooling media that are less sustainable. One alternative environmentally friendly material is agar from the seaweed Gracilaria sp. which is able to form a stable gel at room temperature. This study aims to determine the optimum conditions for the polimerization of the hydrogel "Jelly Ice Cube" based on Gracilaria sp. agar extract to obtain the best mechanical properties as an alternative cooling medium. The research method begins with the preparation of raw materials using 5% NaOH alkali treatment, followed by agar extraction at various temperatures (60, 70, 80, 90, and 100°C) with extraction times of 30 and 60 minutes. Hydrogel polimerization was carried out at room temperature with varying agar concentrations (2, 4, 6, 8, and 10%). Hydrogel characterization includes tensile strength and swelling ratio testing. The results showed that the combination of an extraction temperature of 90°C, a time of 60 minutes, and a concentration of 6% agar produced a hydrogel with the highest tensile strength of 90.23 kPa and a swelling ratio of 913.59%. Meanwhile, the highest swelling ratio of 1062.87% was obtained at an extraction temperature of 100°C, a time of 60 minutes, and a concentration of 2% agar, but with lower mechanical characteristics.
Co-Authors Abdul Rahman Ahmad Fadli Al Athaya, Muhammad Zada Alam, Ahmad Noor Alwathan ANDRI KURNIAWAN Aprilia, Nursyam Drastinawati Drastinawati, Drastinawati Halim, Abd Kusuma, Imam Fatwa Marlinda Marlinda Muh Irwan, Muh Mustafa Prabowo, Agung Ramli Thahir Sugesti, Heni Wandika Putra, Bima