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All Journal Rekayasa Mesin Eksergi: Chemical Engineering Journal Jurnal Rekayasa Material, Manufaktur & Energi SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Menara: Jurnal Teknik Sipil Jurnal Inovasi Pendidikan dan Sains Journal of Biobased Chemicals (JOBC) Jurnal Pengabdian Pada Masyarakat Warta LPM Jurnal Teknologi Kimia Mineral Jurnal Edukasi Pengabdian Masyarakat: EDUABDIMAS Journal of Green Chemical and Environmental Engineering
Ratri Sekaringgalih
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IMPROVED HARDNESS AND CORROSION BEHAVIOUR OF ALUMINIUM 6061 ALLOY THROUGH ECAP PROCESSING Sekaringgalih, Ratri; Putrayasa, I. Nyoman Gede; Puspasari, Vinda; Wardono, Joko Tri; Yustisia, Ari; Ari Kurniawan
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1524

Abstract

The study was done to evaluate the effect of equal channel angular pressing (ECAP) processing on the hardness, optical morphology, and corrosion behavior of Al-6061 alloy. The samples were first annealed, and continued with ECAP process using the Bc route at 120° of internal channel angle with variation of passes (one, two, three, and four). The examination of corrosion resistance of Al-6061 alloy was examined using open circuit potential measurement, tafel polarization, and cyclic polarization. Moreover, the morphology of Al-6061’s surface after corrosion test was also studied using an optical microscope. The hardness test increased gradually with the addition of pass number in ECAP processing from 48.60 HB (0-pass) to 110.8 HB (4-passes). ECAP processing affects the microstructure of Al-6061 alloy, where the elongated grains are aligned parallel to the extrusion direction. Furthermore, the grain size of samples with higher pass numbers is more homogeny than samples with lower pass numbers. Meanwhile, the Tafel Polarization curves showed that ECAP processing in all samples decreased the corrosion rate from 0.6263 mmpy (as-annealed sample) to 0.1508 mmpy (4-passes sample). This phenomenon reveals that the corrosion resistance of Al-6061 alloy samples raises by the existence of ECAP processing. According to the morphological observation of Al-6061 samples, grain refinement due to ECAP processing could improve corrosion resistance.
BIOETHANOL FROM CHEESE WASTE (WHEY) USING KLUYVEROMYCES MARXIANUS Alif Nur Laili Rachmah; Ratri Sekaringgalih; Binti Ruliana; Ansori Ansori
Jurnal Inovasi Pendidikan dan Sains Vol 4 No 3 (2023): December
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Nahdlatul Wathan Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51673/jips.v4i3.1799

Abstract

Alternatives to petroleum scarcity are of much concern to researchers. The development of bioethanol is one of the renewable energies that must be supported by research from various sources of raw materials so that it can be converted into bioethanol. Generally, the raw material of bioethanol used contains sugar and starch. if biomass used sugar cane and cassava then the availability of food will also be threatened. Therefore one of the alternative raw materials that can be used is industrial waste cheese (whey). Whey is the side of the product cheese industry, which contains 4-5%. The aim of the study is to optimate whey fermentation to the production of bioethanol using Kluyveromyces marxianus with the variation of time and starter volume. Bioethanol production with raw material lactose which is contained in whey used Kluyveromyces Marxianus with variabel changed time fermentation and starter volume. For time fermentation variables are 24, 48, 60, 72 dan 84 hours, and for volume starter variabel are 20%, 22%, dan 24% v/v. The highest content of bioethanol production used Kluyveromyces Marxianus on variable starter volume 24% at time 84 hours was obtained 0,32% bioethanol content with pH 3,5
Optimization of Biodegradable Films from Avocado Seed Starch Using Response Surface Methodology Rachmah, Alif Nur Laili; Badaruddin, Sabrianah; Trisnantari, Tamaratritania Citta; Rahanra, Geraldi; Sekaringgalih, Ratri
Journal of Green Chemical and Environmental Engineering Vol. 2 No. 1 (2026): Journal of Green Chemical and Environmental Engineering
Publisher : Candela Edutech Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63288/jgcee.v2i1.23

Abstract

This study aimed to develop and optimize biodegradable films based on avocado seed starch (Persea americana) using glycerol as a plasticizer and chitosan and carrageenan as fillers. The film formulation was optimized using Response Surface Methodology (RSM) with a Box–Behnken Design to evaluate the effects of formulation variables on biodegradability and mechanical properties. The biodegradability values ranged from 31.93 % to 51.94 %, indicating that all films were biodegradable. Increasing glycerol and carrageenan concentrations significantly increased biodegradability, while higher chitosan concentration improved tensile strength but reduced biodegradability. The optimal formulation was obtained at 2.96 % glycerol, 1.56 % chitosan, and 2.85 % carrageenan, with a predicted biodegradability of 53.11 %. The results indicate a trade-off between mechanical strength and biodegradability, where higher plasticizer content enhances degradation but reduces tensile strength. This study demonstrates that RSM optimization is effective in producing biodegradable films with balanced mechanical and environmental performance, highlighting the potential of avocado seed starch as a sustainable packaging material.
IMPLEMENTASI TEKNOLOGI TEPAT GUNA BIOMACERATOR DALAM PENGOLAHAN BIOPESTISIDA LIMBAH TEMBAKAU DI DESA JATIAN, JEMBER Qiromi, Naylatul; Safitri, Putri; Nisya' Ulfiani, Khoirun; Ulayya Al-Daan, Firyaal; Armansyah , Jodi; Wika Amini, Helda; Nurani, Yukti; Ansori; Hakim Raharjo, Sonya; Yufrani Afred, Merymistika; Sekaringgalih, Ratri; Hidayati, Nurul
Jurnal Edukasi Pengabdian Masyarakat Vol 5 No 2 (2026): APRIL 2026
Publisher : FIP UNIRA MALANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36636/eduabdimas.v5i2.9166

Abstract

Jatian Village, Pakusari District, Jember Regency, has ±204,80 hectares of tobacco farmland, around 6.000 plants, and average production of 9,93 quintals of dried tobacco each season. About 18% of biomass becomes waste as inferior leaves and stems that remain unused and may pollute the environment. Yet tobacco waste contains active compounds such as nicotine, alkaloids, and flavonoids that can be used as raw materials for biopesticides. This program examined converting tobacco waste into biopesticide through maceration assisted by a biomacerator. The waste was chopped and dried, then macerated for 48 hours at a 3:7 material-to-solvent ratio using water-ethanol mixtures in two variations (9:1 and 9:2) to compare extraction effectiveness. Effectiveness tests showed that the 20% ethanol formulation accelerated mortality of armyworms within 3 minutes and grasshoppers within 45 minutes, whereas the 10% ethanol formulation required 10 minutes and 1 hour 20 minutes, respectively. The activity increased community understanding from 15% to 85%, enabled 85% of participants to operate the biomacerator independently, and achieved 95% satisfaction, indicating a sustainable solution that strengthens self-reliance in agricultural waste management.
Co-Authors Afred, Merymistika Yufrani Alif Nur Laili Rachmach Alif Nur Laili Rachmah Ansori Ansori Ansori Ansori Ansori Ari Kurniawan Armansyah , Jodi Ayu Qurota A’yun Badaruddin, Sabrianah Bekti Palupi Binti Ruliana Geraldi Rahanra Gessantara, M. Febbia Hakim Raharjo, Sonya Helda Wika Amini Indahma Puji Lestari Julieta, Theressa Nabila Salsabila Hanum Nisya' Ulfiani, Khoirun Nurul Hidayati Puspasari, Vinda Putrayasa, I. Nyoman Gede Putri Safitri Qiromi, Naylatul Sonya Hakim Raharjo Syaifullah, Rangga Yudha Trisnantari, Tamaratritania Citta Ulayya Al-Daan, Firyaal Wardono, Joko Tri Wika Amini, Helda Yohanes Yufrani Afred, Merymistika Yukti Nurani Yuni Susanti Yustisia, Ari