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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology World Chemical Engineering Journal Asian Journal of Multidisciplinary Research ASEAN Journal for Science and Engineering in Materials Jurnal Inspektorat
Maryani, Yeyen
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Temperature Effect on Corrosion Rate of Metal AA 5052 Using D-Galactose Inhibitors In Sulfuric Acid Media With Electrochemical Method Arwati, I Gusti Ayu; Syahbana, Fikri; S., Wiwit; Maryani, Yeyen
World Chemical Engineering Journal VOLUME 6 NO. 2 DECEMBER 2022
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v6i2.17079

Abstract

Aluminum Alloy 5052 (AA 5052) is a metal that can be used as a biopolar plate in proton exchange membrane fuel cell (PEMFC), because it has the advantages of being resistant to corrosion, high conductivity, easy shape and light weight. PEMFC produces electrical energy and the rest of the process in the form of hot water and steam. In a bipolar plate PEMFC environment corrosion can easily occur due to an acidic environment and high operating temperature around 40°C-80°C. For this reason, a treatment is needed to strengthen the corrosion-resistant properties of AA 5052. The coating of the material can be done using the technique of electrophoretic deposition (EPD) using green inhibitor to reduce the corrosion rate. The electrochemical method was carried out to see how much influence temperature had on the corrosion rate of AA 5052. In this study, d-galactose green inhibitor with a concentration of 0.5 g, EPD time of 20 minutes was used, in a PEMFC environmental simulation in 0.5 M H2SO4 sulfuric acid medium, with test temperatures of 25°C (room temperature), 40°C, 60°C, and 80°C. From the results of the analysis using the electrochemical method, there was an effect of temperature on the corrosion rate of AA 5052 without an inhibitor layer of 0.3610 mmpy at room temperature and increased at 80°C 3.9527 mmpy. While AA 5052 which was coated with a d-galactose inhibitor, had a corrosion rate of 0.1678 mmpy at room temperature and continued to increase at a temperature of 80°C 3.7745 mmpy. Inhibitor efficiency was 53.51% at room temperature and decreased with increasing temperature to 4.5% at 80°C.
Corrosion Analysis on AMS 4050 Aluminum Metal in an Extreme Acid Rain Environment by Weight Loss Method Arwati, I Gusti Ayu; Alva, Sagir; Fadilah, Arif; Maryani, Yeyen
World Chemical Engineering Journal VOLUME 5 NO. 2 DECEMBER 2021
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v5i2.12613

Abstract

AMS 4050 aluminum metal which is a type of aluminum, with no Zn content, that composed of 5.7 - 6.7%Cu 2 - 2.6%, Mg 1.9 - 2.6%, Zr 0.15%, Si 0.15% and Mn 0.1% others 0.15% each. The advantage of aluminum is that it weighs only 2.7 gr / cm3, corrosion resistant, good electrical and heat transmitter, easy to fabricate or forge. This AMS 4050 material is widely used in the expansion industry to be used as an aircraft frame. MS 4050 aluminum is more resistant to cracking than other types of aluminum, however cracks can still occur due to corrosion due to acid rain. The test method used to calculate the corrosion rate is the weight loss method. The corrosion rate test results obtained with mean values for immersion of 1, 2, 3, and 4 weeks were 0.03, respectively; 0.07; 0.1 and 0.12 mg / cm2 h. EDX test results showed that the aluminum content in AMS 4050 metal decreased by 18.18%.
Rancangan IPAL Laboratorium untuk Mengolah Air Limbah Praktikum Kimia Rochmat, Agus; Wardoyo, Dyan Eko; Qisthi, Ghufron Zul; Maryani, Yeyen; Ganiadi, Mochamad
Asian Journal of Multidisciplinary Research Vol. 2 No. 2 (2025): Asian Journal of Multidisciplinary Research
Publisher : Jujurnal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59613/mgmmbc73

Abstract

Limbah laboratorium merupakan limbah yang berasal dari buangan hasil praktikum. Laboratorium Kimia Dasar Fakultas Teknik Untirta. Ada 2 aktifitas praktikum di laboratorium Kimia yang berpotensi menghasilkan limbah B3 yakni praktikum Kimia Dasar dan Praktikum Kimia Analitik-Fisik. Potensi limbah ini berupa kandungan logam berat: Pb, Cr, Cu, Amoniak dan zat warna. Setiap kali praktikum, limbah dikumpulkan dalam suatu jerigen dan di akhir semester dikirim ke industri pengolahan limbah untuk dimusnahkan. Penelitian ini bertujuan mendapatkan variasi terbaik penggunaan kombinasi PAC (Poly Aluminium Chloride)sebagai koagulan dan zeolit alam sebagai adsorben dalam pengolahan limbah cair dengan desain mini IPAL kapasitas 15 liter per jam yang didesain dengan sistem batch untuk menurunkan parameter COD, Pb, Cr, Cu hingga 80%. Metodologi penelitian dilakukan optimasi penggunaan PAC pada proses koagulasi dan disempurnakan dengan proses filtrasi terhadap Zeolit teraktifasi basa dan teraktifasi asam. Hasil akhir pengolahan limbah pada limbah praktikum kimia dasar dapat menurunkan kandungan limbah kimia dasar COD  49,62%, menurunkan kadar logam berat: Pb 98,9 %, Cr  44,23%, Cu  49,7 %. Sementara limbah praktikum kimia analitik-fisik diperoleh penurunan COD  60,68%, menurunkan kadar logam berat Pb 99,3%, Cr 95,23%, dan Cu 84,02%.
Solvent Recovery from Industrial Paint Waste using Batch Distillation: The Effect of Temperature Setyawan, Mafaz; Jayanudin, J.; Maryani, Yeyen
ASEAN Journal for Science and Engineering in Materials Vol 4, No 1 (2025): AJSEM: Volume 4, Issue 1, March 2025
Publisher : Bumi Publikasi Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Recovering materials from waste is a viable solution for managing paint-related organic solvent waste. This study focuses on the extraction of organic solvents from paint residues, which contain resins and pigments, to produce a renewed solvent. The method selected for recovery was distillation, which was used for optimizing the separation conditions for the solvents from their waste impurities. Using a batch distillation apparatus with a 30-L capacity, experiments were conducted at varying operating temperatures (120, 130, 140, 150, and 160°C) under a consistent vacuum pressure of 0.9 bar. The optimal results indicated that at 160°C and a vacuum pressure of 0.9 bar, a naphtha solvent with a 66.37% recovery rate was achieved at 19.91 L and an initial feed volume. This method of solvent recovery not only holds promise for waste reduction but also contributes significantly to environmental protection by minimizing pollutants.
Kecerdasan Buatan dan Blockchain untuk Audit Sektor Publik: Sebuah Tinjauan Sistematis Wahyudi, Tri; Zulfikar, Rudi; Maryani, Yeyen; Ibrani, Ewing Yuvisa; Kusuma, Rama Indera; Soleha, Nurhayati; Syaifudin, Rizal; Desmawan, Deris; Oktavianus, Afriman
Jurnal Inspektorat Vol. 1 No. 1 (2025): Jurnal Inspektorat
Publisher : Inspektorat Kabupaten Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64527/inspektorat.v1i1.13

Abstract

Audit sektor publik berperan penting dalam memastikan transparansi dan akuntabilitas keuangan pemerintah. Namun, tantangan dalam efektivitas, efisiensi, serta deteksi dini terhadap penyimpangan masih menjadi kendala. Studi ini mengeksplorasi peran kecerdasan buatan dan blockchain dalam meningkatkan kualitas audit publik melalui tinjauan literatur sistematis. Data dikumpulkan dari jurnal akademik dan laporan kebijakan yang terindeks dalam Scopus, dipublikasikan antara 2019–2024, berbahasa Inggris, dan tersedia secara Open Access melalui penyaringan berbasis PRISMA. Studi ini juga membandingkan penerapan teknologi antara negara maju dan berkembang. Hasil menunjukkan bahwa negara maju memiliki kesiapan regulasi dan infrastruktur yang lebih baik, sedangkan negara berkembang menghadapi tantangan resistensi kelembagaan dan keterbatasan sumber daya. Kecerdasan buatan meningkatkan efisiensi audit melalui otomatisasi analisis data dan deteksi anomali, sementara blockchain memperkuat integritas data melalui pencatatan yang tidak dapat diubah. Implikasi praktis studi ini mencakup perubahan peran auditor publik dari pemeriksa manual menjadi pengelola sistem digital, serta pentingnya integrasi teknologi dalam kebijakan audit dan pengawasan real-time. Kendala utama meliputi ketidakpastian regulasi, keterbatasan teknologi, dan resistensi terhadap perubahan. Studi ini merekomendasikan penguatan kerangka regulasi, pembangunan infrastruktur digital, dan peningkatan literasi teknologi di kalangan auditor. Penelitian lanjutan diperlukan untuk mengevaluasi kesiapan institusi dan dampak jangka panjang dari transformasi digital ini dalam audit sektor publik.
The Physicochemical Properties of Several Indonesian Rice Varieties Susiyanti, Susiyanti; Rusmana, Rusmana; Maryani, Yeyen; Sjaifuddin, Sjaifuddin; Krisdianto, Nanang; Syabana, Mohamad Ana
BIOTROPIA Vol. 27 No. 1 (2020): BIOTROPIA Vol. 27 No. 1 April 2020
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2020.27.1.1030

Abstract

Rice has different varieties, with each variety possessing diverse physical and chemical characteristics. The objective of this study was to analyze the physicochemical properties of several Indonesian local rice varieties. The experiment was conducted from March to April 2017 at the Agriculture Applied Technology Laboratory of the Faculty of Agriculture, Universitas Sultan Ageng Tirtayasa and at the Laboratory of Food Analysis Services in the Department of Food Technology, IPB University. Nine local rice varieties from several areas in Indonesia were used as samples, namely Jalahawara, Ciherang, Pandan Wangi, Rojolele, Sokan, Bendang Pulau, Batang Piaman, Cisantana and Sidrap. Their physicochemical characteristics were analyzed based on some criteria such as: physical quality (weight, length, width, form and percentage of chalkiness), chemical content, water content, ash content, fat content, protein content, carbohydrate content, crude fiber content, starch, amylose and amylopectin content. Data obtained were analyzed by one-way ANOVA using a Randomized Block Design. Jalahawara has the highest percentage of chalkiness. Based on the ratio of length and width, Sidrap and Ciherang were categorized as medium type and the others were oval/round. The heaviest and lightest based on the 1000-grain weight of rice were Ciherang and Bendang Pulau, respectively. The water content was about 2-4% for all samples. The highest and lowest amount of ash and fat content were found in Sidrap and Sokan, respectively. The highest and lowest amount of protein content were found in Batang Piaman and Sokan, respectively. The highest and lowest starch content were observed in Pandan Wangi and Ciherang. The content of amylose and amylopectin was the highest in Batang Piaman. The rice samples were categorized into two groups of low and medium levels of amylose. The low level of amylose was observed in Cisantana, Ciherang, Pandan Wangi and Sidrap, while the medium level of amylose was observed in Jalahawara, Sokan, Bendang Pulau, Batang Piaman and Rojolele.
Co-Authors Agus Rochmat Alva, Sagir Arwati, I Gusti Ayu Desmawan, Deris Fadilah, Arif Ganiadi, Mochamad IBRANI, EWING YUVISA Jayanudin, J. Krisdianto, Nanang Mohamad Ana Syabana Nurhayati Soleha, Nurhayati Oktavianus, Afriman Qisthi, Ghufron Zul Rama Indera Kusuma Rudi Zulfikar Rusmana, Rusmana S., Wiwit Setyawan, Mafaz Sjaifuddin, Sjaifuddin Susiyanti, Susiyanti Syahbana, Fikri Syaifudin, Rizal Tri Wahyudi Wardoyo, Dyan Eko