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Nana Dyah Siswati
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Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Pembuatan Sabun Transparan dengan Penambahan Ekstrak Kayu Secang (Caesalpinia Sappan L) Sebagai Antibakteri DIAN, Dian Ayu Lailatul Fitriyah; Adinda Putri Rachmawati; Titi Susilowati Kindriari Nurma Wahyuni; Nana Dyah Siswati
Jurnal Serambi Engineering Vol. 10 No. 1 (2025): Januari 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Secang Sappanwood grows wild in tropical areas and has a main content of brazilin, which is approximately 200 mg/g. Brazilin is reported to have biological activities such as antibacterial, anti-inflammatory, anti-allergic, antioxidant, and anti-acne. This research aims to obtain transparent soap with secang wood extract which has the best inhibition zone for P. Acnes bacteria and the quality of the soap is in accordance with the SNI standard. The test was carried out using the disc diffusion method. It was started by making Sappanwood extract, then making transparent soap with Sappanwood extract at concentrations of 0.5%, 0.75%, 1%, 1.25%, and 1.5% (w/v). Moreover, it was followed by an antibacterial test of transparent soap. Based on the GC-MS analysis, there was a content of fatty acid of 53.53%, phenolic compound of 25.26%, and terpenoid compound of 6.53%. The results of the organoleptic test on transparent solid soap from Sappanwood extract were reddish-yellowish to reddish brownies with a solid texture and a distinctive oil aroma. It also had a pH of 9.54, water content of 10.8%, and free alkali of 0.072%, which met the SNI quality standards. This soap also had an inhibition zone of 14 mm with the best concentration of 1.5%.
Pemurnian Biogas Menggunakan Proses Adsorpsi Dengan Karbon Aktif Sebagai Adsorben Berlian Mustika Sari; Riyas Hadi Prasojo; Nana Dyah Siswati
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Biogas is a renewable energy source produced by the anaerobic digestion of organic matter.  However, impurities such as carbon dioxide (CO₂) found in raw biogas can reduce its quality as a fuel.  Therefore, a purification process is needed to increase the amount of methane (CH₄) in the biogas.  Adsorption using activated carbon as an adsorbent is one of the efficient purification techniques.  Due to its porous structure and large surface area, activated carbon is very good at absorbing gas pollutants.  By using the adsorption method to reduce the concentration of CO₂, this study aims to increase the amount of methane (CH₄) in biogas.  Changes in the height of the activated carbon adsorption column and the gas flow rate are part of the technique.  With an ideal adsorption efficiency of 96.65% at an adsorbent height of 20 cm and a flow rate of 200 ml/min, the results show that activated carbon is efficient in adsorbing CO₂.  After the adsorption process, the CH₄ content increased to 98.51%, which meets the requirements of the Indonesian National Standard (SNI) for biogas quality.  This research advances the technology for the purification of biogas, which can be used as a renewable energy source.
Co-Authors Adinda Putri Rachmawati Berlian Mustika Sari DIAN, Dian Ayu Lailatul Fitriyah Riyas Hadi Prasojo Titi Susilowati Kindriari Nurma Wahyuni