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All Journal Jurnal Bahan Alam Terbarukan Communications in Science and Technology JURNAL PHOTON Halal Research Journal Sewagati Jurnal Teknologi Kimia Mineral Bulletin of Chemical Reaction Engineering & Catalysis Journal Of Chemical Process Engineering
Sri Rachmania Juliastuti, Sri Rachmania
Jurusan Teknik Kimia, Gedung AO lt. 2 Kampus Politeknik Negeri Malang Jl. Soekarno Hatta No.9 Malang 6514 Telp (0341)404424-404425
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THE EFFECT OF AMOUNT OF NATURAL ZEOLIT CATALYST IN PRODUCT OF POLYPROPILENE (PP) PLASTIC WASTE PYROLYSIS Juliastuti, Sri Rachmania
Jurnal Bahan Alam Terbarukan Vol 4, No 2 (2015): December 2015
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v4i2.4171

Abstract

To overcome the waste problem, especially plastic waste , environmental concerned scientists from various disciplines have conducted various research and actions. Catalytic pyrolysis processes was chosen as an alternative method to recycle plastic waste. The purpose of this experiment was to determine the effect of natural zeolit catalyst on the pyrolysis process with oxygen-free conditions to obtain maximum hydrocarbon compounds (gasoline fraction in C5-C9). The process of pyrolysis was conducted in 3.5 dm3 unstirred stainless steel semi-batch reactor. This process operated at atmospheric pressure with nitrogen injection. Plastic waste that used in this particular paper was 50 grams of polypropylene (PP). In pyrolysis process, natural zeolite catalysts was added 2,5 gram (5% weight of natural zeolite per weight of plastic waste samples), 5 gram (10% ), and 10 gram (20%). Temperature of pyrolysis was 450°C and were maintained until 30 minutes. Steam that produced from pyrolisis was condensed and analysed by gas chromatography–mass spectrometry (GC-MS) to determine yield of hydrocarbons produced. From the analysis of GC-MS, liquid products of pyrolysis contained lots of aromatic hydrocarbons. The optimal amount of catalyst that produce liquid with hydrocarbon compound that has the quality of gasoline was 10 gram (20%) with ≤C9 composition as 29,16% n-paraffin, 9,22% cycloparaffin, and 61,64% aromatics.
Purified Konjac Glucomannan as Thickener for Substituting Gelatin in Making Panna Cotta Rachmaniah, Orchidea; Juliastuti, Sri Rachmania; Wisnu, Mita Mellenia; Samparia, Dian Asrini; Hendrianie, Nuniek; Darmawan, Raden; Meka, Wahyu; Fahmi, Fahmi
Halal Research Vol 4 No 1 (2024): February
Publisher : Halal Center ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j22759970.v4i1.980

Abstract

A thickener such as gelatin is essential in increasing viscosity and forming a gel system. Nowadays, gelatin is one of the most popular thickeners in food, pharmacy, and cosmetic products. Animal skins which lead to halal issues are still common sources of gelatin. Crude konjac flour (CKF) which is sourced from porang tubers and has a high degree of purity of glucomannan (GM) is a potential substitute for animal skins. Moreover, the use of KGM also supports national programs of processing agricultural products into finished products ready to export. This study applies five different CKF variants as panna cotta (PC) thickener: CKF from the fresh bulb of porang (Amorphophallus oncophyllus sp.) (CH-UP), CKF from chips of Porang (CH-CP), a native CKF, as well as laboratory-purified products of CKF (>90%-w of GM content) (DM-CKF-M3X-50, and DM-CKF-M3X-96), and commercially products of porang flour (K-TPO and K-TPM) were applied to make PC; substituting gelatin. Only CKF, DM-CKF-MX-50, and DM-CKF-M3X-96 successfully thickened PC in terms of appearances. Further, organoleptic analysis was applied to CKF, DM-CKF-MX-50, and DM-CKF-M3X-96. According to the organoleptic analysis, PC with CKF, DM-CKF-MX-50, and DM-CKF-M3X-96 was more preferred by the respondents than commercial PC. In overall, CKF application on PC exhibited improved sensory properties and tastes of PC.
One-stage microwave-assisted activated carbon preparation from Langsat peel raw material for adsorption of iron, manganese and copper from acid mining waste Ni'mah, Lailan; Juliastuti, Sri Rachmania; Mahfud, Mahfud
Communications in Science and Technology Vol 8 No 2 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.2.2023.1299

Abstract

This study describes the efficacy of microwave technology for the preparation of an activated carbon from Lansium domesticum peel as an adsorbent to adsorb Fe, Cu, and Mn from acid mine waste. In contrast to the conventional pyrolytic carbonization technique, the described method demonstrated several unparalleled advantages, including superior energy efficiency and remarkably rapid processing. The reported microwave irradiation method was able readily to achieve a morphology and extensive surface area similar to that of a sample produced using the traditional pyrolytic carbonization method for 2 hours, and this was accomplished in just 10 minutes. The activated carbon obtained was characterized using SEM-EDX, BET-BJH, and proximate test and applied to adsorb metal ions from acid mine waste to evaluate the isothermal adsorption model. The best power for activated carbon production was 400 watts for 10 minutes, which met the requirements of ASTM D 4607 for determining the iodine value of activated carbon. Optimal mass for adsorbing Fe, Cu, and Mn from acid mine waste was 4 grams with the removal percentages of 94.08%, 83.69%, and 90.67%, respectively. BET surface area was 1367.0385 m2/g along with a BJH cumulative volume and an average pore diameter of 1.112 cm3/g and 2.25 nm, respectively. This suggests that it possesses mesoporous characteristics and adheres to the Langmuir model during the adsorption process, signifying monolayer adsorption. Meanwhile, kinetics followed the pseudo-second-order rate equation.
Karakteristik Karbon Aktif Teraktifasi HᴣPO4 dari Limbah Sereh (Cymbopogon S.P) Ni`mah, Lailan; Juliastuti, Sri Rachmania; Mahfud, Mahfud; Isna Syauqiah; Agus Mirwan; Harivram, Awali Sir Kautsar; Fitriati, Ulfa; Suryani, Agus
Journal of Chemical Process Engineering Vol. 9 No. 1 (2024): Journal of Chemical Process Engineering
Publisher : Fakultas Teknologi Industri - Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/jcpe.v9i1.686

Abstract

Karbon aktif dapat diperoleh dari bahan-bahan alam (biomaterial) dengan penggunaan sebagai adsorben yang sering disebut dengan biosorben. Berbagai bahan biomaterial yang dapat dimanfaatkan sebagai karbon aktif yaitu yang memiliki kadar selulosa ataupun hemiselulosa, salah satunya yakni limbah sereh. Proses pembuatan karbon aktif dari limbah sereh melibatkan karbonisasi pada suhu 300 °C selama 2 jam dalam furnace, kemudian direndam dengan larutan H3PO4 20% selama 24 jam. Hasil pengarangan dan aktifasi dikarakterisasi dengan analisis kadar air, kadar abu, volatile matter, fixed carbon, dan bilangan iodin serta SEM-EDX untuk mengetahui topografi permukaan arang aktif, ukuran pori dan kandungan unsur pada karbon aktif. Nilai karbon (fixed carbon) pada hasil aktifasi yakni 65,47%; bilangan iodin sebesar 876,46. Rongga karbon aktif dari limbah sereh menggunakan Scanning Electron Microscopy-Energy (SEM) tampak lebih terbuka dan memanjang. Kandungan unsur dari karbon aktif limbah sereh menggunakan Dispersive X-Ray (EDX) sebesar 65,66% untuk nilai karbon (C) dan 32,45% untuk nilai oksigen (O2). Secara keseluruhan, hasil analisis proksimat dan SEM-EDX menunjukkan bahwa karbon aktif dari limbah sereh memenuhi standar SNI 06-3730-1995.
Shelf-Life Test of Kebab Kebuli Al 'Aqoh for Fulfiling Product Quality of Small Medium Enterprise Rachmaniah, Orchidea; Rahmawati, Yeni; Kusumahati, Sari; Juliastuti, Sri Rachmania; Hendrianie, Nuniek; Darmawan, Raden; Oktavianingrum, Eva; Fahmi, Fahmi; Meka, Wahyu
Photon: Jurnal Sain dan Kesehatan Vol. 14 No. 1 (2023): Jurnal Photon
Publisher : LPPM Universitas Muhammadiyah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jp.v14i1.6041

Abstract

Al 'Aqoh Drink & Snack, an SME of PKH ITS, participated in a mentoring program in 2021. A series of long-term test storage, microbial contamination tests, and nutritional content tests were conducted for Kebab Kebuli, a product of Al 'Aqoh Drink & Snack, as an implementation of Halal Assurance System (SJH) and Good Manufacturing Practice (GMP). The test results inferred the hygiene of the Kebab Kebuli production process. Freshly made Kebab Kebuli had a total mold value of 2.00 x 101 CFU/g and Escherichia coli of 6.00 x 101 CFU/g. However, other parameters, such as Salmonella sp. and Staphylococcus aureus, were not detected. Although a few mold numbers were detected, ca. 2.00 x 101 CFU/g, an awareness still needs to be applied. Moreover, a non-pathogenic E. coli bacterium, ca. 6.00 x 101 CFU/g, was detected. E. coli can be minimized with good process and post-production sanitation. Therefore, the cooking and reheating process of Kebab Kebuli at 65 oC and subsequent chilling at 4 oC should have been applied. It may have been enough to suppress the growth of E. coli. Hence, it is necessary to process the Kebab Kebuli according to the serving suggestions and to ensure food safety, i.e., avoiding diarrhea.
BIODEGRADASI XYLENE DARI LAHAN TERCEMAR MINYAK BUMI OLEH BAKTERI RHODOCOCCUS ERYTHROPOLIS Ole, Maria Assumpta Nogo; Juliastuti, Sri Rachmania
JURNAL TEKNOLOGI KIMIA MINERAL Vol 2 No 1 (2023): JURNAL TEKNOLOGI KIMIA MINERAL
Publisher : Politeknik ATI Makassaar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.887 KB) | DOI: 10.61844/jtkm.v2i1.455

Abstract

Peningkatan eksploitasi minyak bumi merupakan sumber utama pencemaran tanah dan air. Tanah yang tercemar hidrokarbon pada dasarnya telah mengandung mikroorganisme yang dapat memecah hidrokarbon. Akan tetapi proses biodegradasi hidrokarbon dengan metode in situ mengalami hambatan karena lahan tercemar yang luas dan kebutuhan nutrien yang tidak terpenuhi. Oleh sebab itu maka dikembangkan metode ex situ dengan memindahkan tanah tercemar ke laboratorium untuk diolah dengan metode slurry bioreaktor. Mikroorganisme yang digunakan dalam proses ini adalah bakteri aerob Rhodococcus erythropolis yang mampu menguraikan alkilbenzena, seperti o-xylena, toluene dan etilbenzena pada temperatur 25oC – 37oC. Proses degradasi dilakukan pada 3 bioreaktor berpengaduk untuk konsentrasi baktri 12,5%, 15,0% dan 17,5%. Monitoring populasi bakteri dilakukan setiap 2 hari untuk mengetahui fase hidup mikroorganisme. Analisis hidrokarbon dilakukan setiap 14 hari selama 8 minggu dengan metode gas chromatography (GC). Bioreaktor 17,5% Rhodococcus erythropolis memberikan persen degradasi paling baik yaitu 96,83%.
Performance of a Batch Operation Microbial Fuel Cell (MFC) with Cobalt Micronutrient Addition Based on Kinetic Models Juliastuti, Sri Rachmania; Laily, Fitria Nur; Darmawan, Raden
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 1 Year 2025 (April 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20259

Abstract

The generation of electricity via MFC is subject to alteration by the concentration of the substrate. The objective of this study was to examine the performance of MFCs using both theoretical and experimental methods to ascertain the kinetic parameters associated with the addition of cobalt, with the aim of enhancing electricity generation via MFCs. The study demonstrated the impact of varying substrate concentrations and the composition of food waste and water, with formulas 0:5, 1:4, 2:3, 3:2, 4:1, and 5:0 (w/v). The kinetics of biochemical reactions were determined by employing the Monod and Gates-Marlar equations. The Monod equations were evaluated using three distinct representation methods. The Langmuir, Lineweaver-Burk, and Eadie-Hofstee models were employed. Conversely, the electrochemical reaction rate is evaluated through the Butler-Volmer equation. The current density derived from the theoretical approach exhibited a comparable pattern to that observed in the experimental data. The maximum power density was attained at a substrate concentration of 4:1 (w/v) exceeding 25,000 mW/m². The presented model facilitated the enhancement and optimization of MFC performance. Substrate concentration and biomass concentration exert a significant influence on MFC performance, as evidenced by the analysis of variance (ANOVA) and response surface methodology (RSM). Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Silica Synthesis from Mount Semeru Volcanic Ash as a Nickel Heavy Metal Adsorbent Darmawan, Raden; Juliastuti, Sri Rachmania; Hardiatmoko, Bagas; Defriana, Aulia; Laily, Fitria Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 2 Year 2025 (August 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20337

Abstract

This study aims to synthesize SiO2 gel-based adsorbents using the sol-gel method from Mount Semeru volcanic ash through varying concentrations of sodium hydroxide and acid catalysts and to determine its adsorption capacity on nickel (Ni(II)). Volcanic ash was obtained from Lumajang District, East Java, Indonesia. The silica gel adsorbent was made using the sol-gel method with different amounts of NaOH (1.0 M, 2.0 M, 3.0 M, and 4.0 M) and acid catalysts (acetic and hydrochloric acid). First, silica (SiO2) was extracted from the volcanic ash, and then the sol-gel process was used to manufacture SiO2 gel-based adsorbents. The SiO2 gel was analyzed using X-ray Fluorescence Analysis, Fourier-transform Infrared (FTIR), and Brunauer Emmett, and Teller (BET). Adsorption analysis of the Ni(II) metal ion content was conducted at various stirring rates and adsorbent dose masses. The results obtained showed that the most optimal SiO2 gel was achieved when using 3.0 M NaOH, 10.53% HCl, and 8.30% CH3COOH. Through FTIR analysis, NaOH 3.0 M x HCl silica contains only the siloxane groups, whereas NaOH 3.0 M x CH3COOH silica contains both the silanol and siloxane groups. The best results were gained with SiO2-based adsorbents (NaOH 3.0 M x CH3COOH) at a dose of 10 g/L and a stirring rate of 50 rpm, with Ni(II) adsorption effectiveness of 99.80%. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Penerapan Pangan Jajan Anak Sekolah (PJAS) pada SDN MOJO VI Surabaya dan Potensinya untuk dikembangkan menjadi ZONA Kuliner Halal Aman dan Sehat (KHAS) Kluster Pendidikan Tingkat Dasar Airlangga, Bramantyo; Rahmawati, Yeni; Juliastuti, Sri Rachmania; Darmawan, Raden; Machmudah, Siti; Aparamarta, Hakun Wirawasista; Roesyadi, Achmad; Sumarno, Sumarno; Rachmaniah, Orchidea
Sewagati Vol 9 No 4 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i4.2511

Abstract

Makanan sehat mendukung sistem kekebalan tubuh, menjaga tubuh tetap kuat dan siap melawan infeksi dan penyakit. Adanya penerapan program Pangan Jajan Anak Sekolah (PJAS) di SDN MOJO VI Surabaya secara tidak langsung meningkatan kesadaran siswa sekaligus orang tua siswa akan pentingnya memilih jajan anak yang aman dan sehat. Hal ini tidak hanya bermanfaat bagi siswa di sekolah, namun dalam jangka panjang akan mempengaruhi kebiasaan makan keluarga. Penerapan PJAS pada kios-kios kantin sekolah merupakan langkah awal penerapan Sistem Jaminan Halal (SJH); mengingat kriteria PJAS yang sesuai adalah aman dan bermutu selain bergizi. Sehingga PJAS yang aman dan bermutu selangkah menuju PJAS halal. Pemberian pendampingan gratis untuk pengajuan sertifikasi halal dilakukan kepada setiap kios di SDN MOJO VI Surabaya: kantin Melati, Kenanga, Anggrek, dan Mawar. Kegiatan ini membawa keberhasilan bagi SDN Mojo VI Surabaya dalam meraih juara 1 Nasional dalam kategori PJAS. Penerapan PJAS sekaligus sertifikasi halal disetiap kios kantin di SDN Mojo sangat berpotensi untuk ditingkatkan menjadi Zona KHAS. Sehingga pihak pengelola Kantin SDN MOJO VI Surabaya tidak hanya menjamin kehalalan makanan tetapi juga menjamin kebersihan dan kesehatan jajan siswanya secara keseluruhan.
Co-Authors Achmad Roesyadi Agus Mirwan Airlangga, Bramantyo Aparamarta, Hakun Wirawasista Darmawan, Raden Defriana, Aulia Fahmi Fahmi FITRIA NUR LAILY Hardiatmoko, Bagas Harivram, Awali Sir Kautsar Hendrianie, Nuniek Isna Syauqiah Kusumahati, Sari Mahfud Mahfud Maria Assumpta Nogo Ole Meka, Wahyu Ni'mah, Lailan Ni`mah, Lailan Oktavianingrum, Eva Rachmaniah, Orchidea Samparia, Dian Asrini Siti Machmudah Sumarno . Suryani, Agus Ulfa Fitriati Wisnu, Mita Mellenia Yeni Rahmawati, Yeni