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All Journal Sains Natural: Journal of Biology and Chemistry Indonesian Journal of Chemical Engineering
Aster Rahayu
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Materials Science & Nanotechnology

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Effect of NaOH Concentration on Surface Width and Pore Volume of Silica Gel From Beef Shrain as Adsorbent Nurmutaaqimah; Siti Jamilatun; Aster Rahayu
Sains Natural: Journal of Biology and Chemistry Vol. 15 No. 2 (2025): Sains Natural
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31938/jsn.v15i2.814

Abstract

Rice husk is a natural source of silica that has the potential to be utilized in various applications, especially in industrial wastewater treatment. This study aims to determine the effect of NaOH concentration on the surface area and pore volume of silica gel from rice husk as an adsorbent. The method used is sol-gel with variations in NaOH concentration, namely 1, 2, and 3 M. The process of making silica gel consists of four steps. The silica gel manufacturing process consists of four steps: (1) combustion of rice husk using a furnace, (2) preparation of sodium silicate solution, (3) formation of silica gel through the addition of HCl, and (4) sample testing. Based on XRF analysis, rice husk ash is rich in silica (SiO₂) with a concentration of up to 32.189%, while water content testing shows that the 2 M NaOH concentration provides the largest decrease in water content (96%), higher than the concentrations of 1 M and 3 M, which reach 95%, in line with the results of BET analysis showing optimum conditions at a concentration of 2 M producing the highest surface area (138.720 m²/g) and the largest pore volume (0.673 cm³/g). The 1 M NaOH concentration produced a smaller surface area of 73.869 m²/g with a pore volume of 0.501 cm³/g. Meanwhile, the 3 M NaOH concentration decreased the surface area to 111.626 m²/g with a pore volume of (0.640 cm³/g). Overall, the 2 M NaOH concentration proved to be the most effective in increasing surface area and pore volume. Thus, the resulting silica gel is very suitable for adsorption applications, especially in the treatment of industrial wastewater.
Utilization of Snails as Liquid Organic Fertilizer (POC) with the Anaerobic Composter Tube Method Syahrani Pramia Lestari; Dwi Rossani Nur Afifah; Lukhi Mulia Shitophyta; Aster Rahayu
Indonesian Journal of Chemical Engineering Vol. 3 No. 1 (2025)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v3i1.1414

Abstract

Indonesia is a country with thousands of islands inhabited by flora and fauna, with these conditions, many organisms such as snails are found. Snails are often considered pests by vegetable farmers. Snails contain amino acids, nitrogen, phosphorus, potassium, and protein that can help increase plant growth and development. The purpose of this study was to utilize snails as liquid organic fertilizer, to find out the process of making liquid organic fertilizer from snails, to find out the differences in the content of liquid organic fertilizer from the three samples, to find out the comparison of growth in eggplant as a test medium, and to find out the effect of the comparison of molasses and snails. The research methods include preparation of raw materials, boiling and crushing snails, mixing materials, and the fermentation process. After that, the fertilizer from the study was analyzed to determine the content of N, P, K. The results showed that for the analysis of NPK content obtained in a sample of 100 grams of snails, the N content value was 0.028%, P 2 O 5 0.016%, K 2 O 0.003%. In a sample of 300 grams of snails, the N content value is 0.041%, P 2 O 5 0.043%, K 2 O 0.050%. Comparative analysis of purple eggplant plants given snail POC and not given snail POC can be seen the difference in stem height and leaf width. In sample 1 which was not given snail POC, the stem height was 9 cm and the leaf width was 5.4 cm, sample 2 with 100 grams of snails had a stem height of 11.2 cm and a leaf width of 7.1 cm, in sample 3 with 300 grams of snails had a stem height of 12.3 cm and a leaf width of 7.7 cm, while in sample 4 with 500 grams of snails which had a stem height of 15.4 cm and a leaf width of 9.5 cm. This shows that sample 4 with 500 grams of snails has a very good growth rate. The differences in the research test results are due to differences in the dosage or variation and weight of snails and molasses given to each sample.  
Potential Blending of Short Residues, Automotive Diesel Oil (ADO) and Kerosene for Marine Fuel Oil (MFO) Low Sulphur 180 Export Quality at PT. XYZ Using H-CAMS Simulation Saputra, Agung Aldi; Samhani Mahendra Wijaya; Astuti, Erna; Aster Rahayu
Sains Natural: Journal of Biology and Chemistry Vol. 14 No. 1 (2024): Sains Natural
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31938/jsn.v14i1.595

Abstract

Marine Fuel Oil (MFO) Low Sulfur is a ship fuel for engines that have an rpm <300, which has a maximum sulfur content of 0.5% wt and a Kinematic Viscosity limit at a temperature of 50 ℃ with a maximum of 180 CSt. Blending MFO products has the potential to meet international market demand and optimize sales of MFO products in domestic and international markets. The change in specifications requested by PIMD (P International Marketing & Distribution) refers to the Decree of the Director General of Oil and Gas No. 0179.K/10/DJM.S/2019. This research aims to meet international market demand so that MFO (Marine Fuel Oil) products with new specifications are needed. This research uses a blending optimization method using Short Residue (SR), Automotive Diesel Oil (ADO), and Kerosene (KR) using simulation using H-CAMS software. This research focuses more on the critical values of MFO products, namely Density, Kinematic Viscosity, Flash Point, and Pour Point analysis. The blending simulation process has 12 variations between SR: ADO: KR. As the composition of ADO and Kerosene increases in the blending ratio, it causes a decrease in the Density, Flash Point, Kinematic Viscosity, and Pour Point values. In this research, the most optimum blending formula was found, namely formulas 4, 5, 10, and 11, all critical specifications in the manufacture of the MFO 180 LS product were met except for the Pour Point parameter, so this research needs to be continued by reducing the pour point value.
Co-Authors Dwi Rossani Nur Afifah Erna Astuti Lukhi Mulia Shitophyta Nurmutaaqimah Samhani Mahendra Wijaya Saputra, Agung Aldi Siti Jamilatun Syahrani Pramia Lestari