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All Journal J-Dinamika: Jurnal Pengabdian Kepada Masyarakat Reswara: Jurnal Pengabdian Kepada Masyarakat Distilat: Jurnal Teknologi Separasi Jurnal Teknik Kimia dan Lingkungan
Lusiani, Cucuk Evi
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Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Energy Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Social Sciences

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Journal : Jurnal Teknik Kimia dan Lingkungan

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Utilization of Red Dragon Fruit (Hylocereus polyrhizus) Peel Waste as an Alternative Indicator for Acid - Base Titration Azkiya, Noor Isnaini; Sukmawanta, Shafara Najla Marinda; Lusiani, Cucuk Evi
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i1.6169

Abstract

Titration indicators are organic (generally) or inorganic compounds used in titrations to determine and indicate the end point of a titration. Indicators that are widely used in acid-base titrations are synthetic indicators such as phenolphthalein (PP), methyl red (MM), methyl orange (MO), and phenol red (MF). Apart from being relatively expensive, the use of these indicators also produces chemical waste which can pollute the environment. The solution to overcome this problem is to utilize natural ingredients as a substitute for synthetic indicators. The natural indicator used in this research was the peel of red dragon fruit (Hylocereus polyrhizus). Red dragon fruit peel contains flavonoid compounds, one of which is anthocyanin. Anthocyanins are polar so they can be dissolved in polar solvents such as ethanol. This research aims to determine the effect of the type of solvent and length of maceration time in anthocyanin extraction as an indicator for strong acid-strong base titration, and to determine the effect of storage time on the stability of red dragon fruit peel extract. In the maceration process, a variable ratio of solvent to red dragon fruit peel was used 1:5 (w/v). The solvents used were ethanol, methanol, and acetone acidified with 5 mL of HCl 1% (v/v). Identification of anthocyanin compounds was carried out using FT-IR and UV-Vis. In this study, the highest anthocyanin content was found in the acetone solvent 9x10-4 mg/100 g and the lowest was in the methanol solvent at 6x10-4 mg/100 g. Furthermore, the most similar application to a commercial titration indicator is the use of methanol and acetone solvents with a 24-hour extraction time.
PID-Controlled Pyrolysis of Medical Mask Waste for Enhanced Alternative Fuel Production Lusiani, Cucuk Evi; Dewi, Ernia Novika; Hardjono, Hardjono; Naryono, Eko; Febriani, Nahdiyah Nur; Nurlaila, Istiqomah Hanifa
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.8685

Abstract

The escalating volume of plastic-based medical mask waste, exacerbated by the COVID-19 pandemic, presents an urgent environmental challenge that can be addressed through sustainable valorization. This study proposes a novel, integrated approach by evaluating the effectiveness of a Proportional-Integral-Derivative (PID) temperature control system to minimize thermal fluctuations critical for consistent product selectivity of the pyrolysis process. A rigorous comparative evaluation of the Cohen-Coon (CC) and Internal Model Control (IMC) tuning methods demonstrated IMC's superiority, achieving a significantly shorter settling time of 114 minutes and a low overshoot of 0.45, ensuring stable isothermal operation. Pyrolysis process conducted under this optimized control condition (at 250°C for 5 hours) resulted in high liquid fuel yields and improved physical characteristics (density 785.8 kg/m3, viscosity 1.546 cSt). Gas Chromatography-Flame Ionization Detector (GC-FID) confirmed that the liquid fuel exhibits hydrocarbon fractions highly similar to commercial kerosene and diesel. These findings underscore that the precision of the IMC-PID method is the key technical enabler for enhancing both process stability and the subsequent quality and yield of valuable liquid fuel derived from medical mask waste.
Co-Authors Aqnivia, Imelda Nur Ariani Ariani Asrori Asrori Damayanti, Aprillia Dewajani, Heny Dewi, Ernia Novika Eko Naryono Febriani, Nahdiyah Nur Hardjono Hardjono, Hardjono Indahsari, Amelia Putri Ita purnamasari, Ita Kamaliya, Nurul Karimah, Miftahul Maharani, Dea Resty Novita Negari, Dynda Farisa Cahya Noersoesanto, Eko Noor Isnaini Azkiya, Noor Isnaini Noviarto, Bonifasius K. Nurida, Ulfa Nurlaila, Istiqomah Hanifa Paramitha, Olivia Julia Permanaputri, Salvira Prayitno Prayitno Putri, Zauziah Pramiswari Rani, Lita Sa'diyah, Khalimatus Sa’diyah, Khalimatus Sinawang, Rias Becik Sri Rulianah, Sri Subagyo Subagyo Sukmawanta, Shafara Najla Marinda Sulistiyawati, Merita Ulumma, Rosyana Sabyllatul Uzlah, Pandega I. Zhishan, Zhang