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All Journal Jurnal Bahan Alam Terbarukan Seminar Nasional Teknik Kimia Kejuangan Prosiding Semnastek KOVALEN: Jurnal Riset Kimia JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya FLUIDA Fullerene Journal of Chemistry Kumawula: Jurnal Pengabdian Kepada Masyarakat International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Industrial Research Workshop and National Seminar
Ngatin, Agustinus
Jurusan Teknik Kimia, Politeknik Negeri Bandung
Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Aplikasi Ekstrak Eceng Gondok dalam Korosi dengan Pelarut Metanol Rony pasonang sihombing; Putri Utami Dita Cahya; Nidaa’ Rihhadatul ‘Aisya Komara; Restu Adji Alif Asyari; Annisa Nurlatifah; Agustinus Ngatin; Yunus Tonapa Sarungu
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 6, No 2 (2022)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.181 KB) | DOI: 10.17977/um0260v6i22022p001

Abstract

Eceng gondok memiliki kandungan antioksidan seperti lignin, tanin, saponin, dan alkaloid yang dapat berikatan dengan logam membentuk lapisan pelindung sebagai inhibitor organik pada proses korosi. Tujuan dari penelitian ini adalah menentukan kandungan antioksidan dalam ekstrak eceng gondok yang dapat menurunkan laju korosi pada logam. Proses maserasi dilakukan dengan rasio sampel : metanol adalah 1:9 (b/v). Jenis senyawa antioksidan diuji menggunakan metode fitokimia sedangkan aktivitas antioksidan diuji dengan metode FRAP (Ferric Reducing Antioxidant Power. Pengujian korosi baja menggunakan metode coupon dengan waktu pengkorosian 5 hari dalam media udara, air hujan, dan air keran. Hasil yield ekstrak sebesar 72,80%. Berdasarkan hasil uji fitokimia sedangkan FRAP) ekstrak positif mengandung senyawa antioksidan yaitu alkaloid, tanin dan saponin dengan konsentrasi antioksidan sebesar 296,547 ppm. Inhibitor organik yang menunjukkan effisiensi inhibisi paling tinggi pada konsentrasi 75 ppm dengan nilai 94,52% dalam media air keran, 65,53% pada media udara, dan 52,96% pada media air hujan.
Pengaruh Jenis Elektrolit Proses Anodisasi Aluminium Terhadap Efisiensi Proses Dan Sifat Mekanik (Kekerasan) Permukaan Dan Ketebalan Lapisan Oksida Rony pasonang sihombing; Agustinus Ngatin; Salsabila Nisrina Junaedi; Wina Maulida; Emma Hermawati Muhari; Alfiana Adhitasari; Yusmardhany Yusuf
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 6, No 2 (2022)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.943 KB) | DOI: 10.17977/um0260v6i22022p024

Abstract

Aluminium adalah logam untuk  bahan peralatan di industri karena mempunyai sifat-sifat yang unggul seperti kuat, ringan, dan mudah dibentuk, tetapi sifatnya mudah terdeformasi dan mempunyai kekerasan serta ketahanaan aus yang rendah. Untuk memperbaiki sifat fisis dan mekanis aluminium dapat dilakukan melalui proses anodisasi. Tujuan penelitian ini adalah menentukan pengaruh jenis  elektrolit pada proses anodisasi terhadap efisiensi proses dan produk tebal lapisan oksida dan sifat mekanik (kekerasan) permukaan aluminium.  Proses anodisasi aluminium dilakukan bervariasi jenis elektrolit (asam sulfat, asam fosfat, asam oksalat, asam kromat,) dengan konsentrasi 15%. Suhu proses anodisasi dibuat konstan pada 25 ⁰C dengan waktu proses 20 menit, dan tegangan 18 Volt.  Hasil penelitian ditunjukkan bahwa proses anodisasi dalam larutan asam sulfat memiliki efisiensi tertinggi yaitu 51,98% daripada ketiga elektrolit yang lain, dan menghasilkan produk ketebalan lapisan oksida paling tinggi mencapai 13,88 µm dan kekerasan permukaan aluminium 287,9 HV, dalam larutan asam fosfat menghasilkan efisiensi terendah yaitu 0,99%, ketebalan lapisan oksida 0,28 µm dan kekerasan permukaan logam aluminium 41,3 HV yang nilainya lebih rendah dari kekerasan permukaan logam dasar yaitu 66,75 HV.
Pengaruh Konsentrasi Kaolin dan ZnO dengan Penambahan PVOH Terhadap Karakteristik Bioplastik Berbasis Pati Ngatin, Agustinus; Sihombing, Rony P; Al-Ghifari, Muhammad Z; Maulana, Fauzan I
Prosiding Industrial Research Workshop and National Seminar Vol. 13 No. 01 (2022): Vol 13 (2022): Prosiding 13th Industrial Research Workshop and National Semin
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (470.904 KB) | DOI: 10.35313/irwns.v13i01.4170

Abstract

Bioplastik berbasis pati dapat dijadikan sebagai alternatif dari permasalahan plastik konvensional karena memiliki kelebihan yaitu dapat terdegradasi secara alami, namun memiliki kelemahan berupa buruknya karakteristik yang membuat fungsionalitasnya menurun. Kekurangan tersebut dapat diatasi dengan penambahan filler seperti ZnO dan kaolin clay, plasticizer, serta aditif seperti PVOH. Penelitian ini bertujuan untuk mempelajari pengaruh penambahan bahan tersebut terhadap daya serap air dan biodegradabilitas bioplastik sebagai alternatif bagi penggunaan plastik konvensional. Bioplastik jenis ini dibuat dengan mencampurkan pati dengan 25% b/b gliserol, filler (ZnO atau kaolin clay) dengan variasi konsentrasi (3%, 6%, 9%, dan 12%, b/b), dan 5% b/b PVOH ke dalam air dengan pemanasan dan pengadukan kontinyu. Hasil penelitian menunjukkan bioplastik dengan filler ZnO memiliki daya serap air lebih baik namun sifat biodegradabilitasnya lebih rendah dibandingkan filler kaolin clay. Penambahan PVOH meningkatkan biodegradabilitas bioplastik dengan filler ZnO, namun sebaliknya pada filler kaolin clay. Bioplastik dengan daya serap air terbaik didapatkan pada penambahan filler ZnO 12% b/b dan PVOH 5% b/b dengan nilai daya serap air 70,2644%, sedangkan biodegradabiliras terbaik didapatkan pada penambahan filler kaolin clay 3% b/b dan PVOH 5% b/b dengan nilai sebesar 34,0608%.
Ekstraksi Daun Tembakau dengan Metode MAE (Microwave Assisted Extraction) dengan Variasi Jenis Pelarut dan Waktu Ekstraksi pada Daya Microwave 150 Watt Sihombing, Rony Pasonang; Tamba, Alfonsius Perdija; Renata, Calvin Aditya; Ngatin, Agustinus
Prosiding Industrial Research Workshop and National Seminar Vol. 13 No. 01 (2022): Vol 13 (2022): Prosiding 13th Industrial Research Workshop and National Semin
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (358.162 KB) | DOI: 10.35313/irwns.v13i01.4171

Abstract

Tembakau merupakan salah satu rempah-rempah yang pertumbuhannya cukup besar di Indonesia. Berdasarkan data Badan Pusat Statistik produksi tembakau Indonesia pada 2020 sebesar 261.011 ton. Hal tersebut adalah potensi yang sangat besar, namun pemanfaatan tembakau sejauh ini mayoritas hanya digunakan pada industri rokok. Penelitian mengenai ekstraksi tembakau diharapkan mampu mendorong peluang pemanfaatan tembakau untuk keperluan lain selain bahan baku rokok, seperti inhibitor korosi dan bioinsektisida. Penelitian ini bertujuan untuk mengetahui pengaruh waktu ekstraksi dan jenis pelarut terhadap perolehan rendemen ekstrak tembakau. Metode ekstraksi yang digunakan adalah MAE (Microwave Assisted Extraction). Pelarut yang digunakan etanol 96% dan methanol 95%, serta waktu ekatraksi yang digunakan adalah 5,10,15, dan 20 menit. Analisis yang dilakukan adalah analisis rendemen, densitas, dan GC-MS. Hasil ekstrak menggunakan pelarut metanol dan etanol mencapai densitas rata-rata masing-masing 0.82 g/mL dan 0.83rendemen tertinggi yang dihasilkan masing-masing 37.74% dan 38.05% pada waktu ekstraksi 10 menit. Berdasarkan hasil GC-MS komponen tertinggi dalam ekstrak adalah nikotin dengan komposisi pada ekstrak dengan pelarut etanol dan metanol masing-masing 96.1% dan 95.5%.
Pengaruh Tegangan Operasi Dalam Peningkatan Sifat Mekanik Hasil Hard Anodizing Aluminium 1100 Dalam Asam Sulfat 15% Dan Asam Fosfat 1% Rusmana, Muchamad Raihan Surya; Ibrahim, Idham Kholid; Ngatin, Agustinus; Sihombing, Rony Pasonang
Prosiding Industrial Research Workshop and National Seminar Vol. 14 No. 1 (2023): Vol 14 (2023): Prosiding 14th Industrial Research Workshop and National Semina
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v14i1.5405

Abstract

Aluminium alloy 1100 umum digunakan dalam industri otomotif khususnya kendaraan komersial, seperti sebagai bahan pembuat komponen pesawat terbang. Untuk memenuhi sifat-sifat fisik dan mekanis agar tahan terhadap cuaca ekstrem dan lingkungan yang mengandung air garam perlu adanya peningkatan ketahanan aus dan kekerasan permukaan melalui proses hard anodizing. Dalam proses hard anodizing, dilakukan pengampelasan benda kerja yang akan digunakan, kemudian dilakukan proses pickling, degreasing, dan neutralizing. Selanjutnya, dilakukan proses hard anodizing dengan menempatkan benda kerja pada kutub positif dan elektroda pada kutub negatif (katoda) dari sumber arus DC. Proses hard anodizing ini menggunakan larutan eletrolit campuran H2SO4 15% dan H3PO4 1% dengan rapat arus yang digunakan 3A/dm2, temperatur 5oC serta variasi tegangan 10V dan 20V. Dari penelitian ini didapatkan pada tegangan 20V dengan efisiensi terbaik 83,05%, ketebalan lapisan oksida terbaik 11,43 mm dan kekerasan permukaannya 144,25 HVN.
EFFECT OF VOLTAGE ON THE THICKNESS OF OXIDE LAYER AT ALUMINUM ALLOYS FOR STRUCTURAL BONDING USING PHOSPHORIC SULFURIC ACID ANODIZING (PSA) PROCESS Chamidy, Harita N; Ngatin, Agustinus; Rosyadi, Anisa Fitriani; Julviana, Arisya; Noviyani, Noviyani
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 1 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.01.8

Abstract

The aerospace industry mostly uses the aluminum alloys 2xxx and 7xxx series for their fuselage construction, and some of them are assembled using structural bonding because it is strong, easy during the fabrication process, resistant to corrosion, and non-toxic. The anodization process is a proven surface treatment method for structural bonding. Phosphoric Sulfuric Acid Anodizing (PSA) is an eco-friendly alternative as a chromate-free solvent technology for the anodizing process that is applied for structural bonding. The thickness of the oxide layer caused by the voltage given in this process was evaluated in terms of corrosion resistance using the oxide layer's thickness as the main factor. The PSA process of AA2024 T3 clad was carried out at a constant concentration of 125 g/L of phosphoric acid, 80 g/L of sulfuric acid, 27 A, and a temperature of 26 to 28 OC for 23 minutes with various voltages. The voltage was varied at 16, 18, and 20 VDC. The optimum condition for the voltage applied was 18 VDC, which resulted in an oxide layer thickness of 2.76 µm.
EFFECT OF VOLTAGE ON THE THICKNESS OF OXIDE LAYER AT ALUMINUM ALLOYS FOR STRUCTURAL BONDING USING PHOSPHORIC SULFURIC ACID ANODIZING (PSA) PROCESS Chamidy, Harita N; Ngatin, Agustinus; Rosyadi, Anisa Fitriani; Julviana, Arisya; Noviyani, Noviyani
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 1 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.01.8

Abstract

The aerospace industry mostly uses the aluminum alloys 2xxx and 7xxx series for their fuselage construction, and some of them are assembled using structural bonding because it is strong, easy during the fabrication process, resistant to corrosion, and non-toxic. The anodization process is a proven surface treatment method for structural bonding. Phosphoric Sulfuric Acid Anodizing (PSA) is an eco-friendly alternative as a chromate-free solvent technology for the anodizing process that is applied for structural bonding. The thickness of the oxide layer caused by the voltage given in this process was evaluated in terms of corrosion resistance using the oxide layer's thickness as the main factor. The PSA process of AA2024 T3 clad was carried out at a constant concentration of 125 g/L of phosphoric acid, 80 g/L of sulfuric acid, 27 A, and a temperature of 26 to 28 OC for 23 minutes with various voltages. The voltage was varied at 16, 18, and 20 VDC. The optimum condition for the voltage applied was 18 VDC, which resulted in an oxide layer thickness of 2.76 µm.
Effect of Phosphate Concentration on Anodizing Process Efficiency and Aluminium Surface Hardness in 16% Sulfuric Acid Solution Sudarman, Robby; Indarti, Retno; Nurcahyo, Nurcahyo; Fauzan, Ahmad; Ngatin, Agustinus; Sihombing, Rony Pasonang
Fluida Vol. 17 No. 1 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i2.4461

Abstract

One of the problems the aircraft industry faces is equipment that has decreased performance in the period before planning. The solution to this condition is that a material that has hard properties and is corrosion-resistant is needed. Aluminium is a metal that is applied as equipment in the industry because it has the characteristics of being light, strong, corrosion resistant and easy to shape, but has properties that are easy to deform, have low hardness and wear resistance. Anodizing process has the characteristics to improve the surface properties of aluminium metal in physical and mechanical properties. The anodizing process of aluminium metal using sulfuric acid solution produces a thicker oxide layer than in other solutions, such as phosphoric acid solution. This research studied the effect of phosphoric acid concentration on process efficiency, oxide layer thickness, and the hardness of the anodized oxide layer in 16% sulfuric acid solution. Phosphoric acid solution concentration varied from 0; 0.5; 1;2;4; and 8% in 16% sulfuric acid solution at 5 Volts voltage or 1.12 A/dm2 current density with 25 minutes processing time. The results showed that the anodizing process in 16% sulfuric acid solution had the lowest efficiency of 19.3% after adding variations in the concentration of phosphoric acid. These conditions reached the optimum in 16% sulfuric acid solution with the addition of 1% phosphoric acid; 26.6 mg oxide mass; 50.33% efficiency; 90.48 mg/dm2 oxide layer thickness and 86.57 HV metal surface hardness
Laju Korosi Logam Baja Karbon Rendah di Larutan Garam pada Berbagai Konsentrasi Inhibitor Korosi dari Ekstrak Daun Pepaya: Low Carbon Steel Metal Corrosion Rate in Salt Solution at Various Concentrations of Corrosion Inhibitor from Papaya Leaf Extract Wahyuni, Ninik Lintang Edi; Sihombing, Rony Pasonang; Nurcahyo; Ngatin, Agustinus; Sarungu, Yunus Tonapa; Adhitasari, Alfiana; Soeswanto, Bambang; Muhari, Emma Hermawati; indarti, retno
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 2 (2023): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i2.16344

Abstract

Papaya leaf extract could be used as an organic corrosion inhibitor. Corrosion inhibitors were used as a method to reduce corrosion rate. The most corrosive environment was the marine environment. The purpose of this study was to determine the best concentration of papaya (Carica papaya) leaf extract inhibitor which could reduce the corrosion rate of low carbon steel in a 3.56% NaCl solution environment. The maceration process was carried out for 24 hours with 70% ethanol solvent with a solute:solvent ratio of 1:8 (w/v) at room temperature. Inhibitor extracts were analyzed qualitatively with the phytochemical method. The addition of FeCl3 was carried out on the inhibitor extract from papaya leaves. The color change occurred from blackish brown to greenish black which indicated the presence of tannin compounds in the papaya leaf extract. Corrosion testing was carried out with hot stream temperature setting at 45⁰C to 55⁰C and concentrations of inhibitor extracts at 300, 600, and 900 ppm. The test was conducted for 36 hours with a span of metal mass every 6 hours. Corrosion rate calculation is done by weight loss method. The results showed that papaya leaf extract inhibitors positive contained corrosion inhibitor and could reduce the corrosion rate in 3.56% NaCl solution. The corrosion rate without inhibitor is 1.023 mmpy. Corrosion rates with inhibitor concentrations of 300, 600, and 900 ppm were 0.755, 0.585, and 0.438 mmpy, respectively.
Pengolahan Air Limbah Tahu Menggunakan Metode Elektrokoagulasi dan Adsorpsi Secara Kontinyu: Tofu Wastewater Treatment Using Continuous Electrocoagulation and Adsorption Method Wahyuni, Ninik Lintang Edi; Nurcahyo; Leoanggraini, Unung; Sudarman, Robby; Soeswanto, Bambang; Muhari, Emma Hermawati; Ngatin, Agustinus; Sihombing, Rony Pasonang
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 2 (2023): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i2.16446

Abstract

Tofu wastewater contains a lot of protein therefore it is easily degraded to produce foul odors and harmful gases due to microbes. Protein levels can be reduced through the electrocoagulation method which is equipped with adsorption. The purpose of this study is to reduce the value of turbidity, TSS, and COD in tofu wastewater due to the influence of voltage in the electrocoagulation process which is equipped with an adsorption process. This research was conducted with an electrocoagulation process at a rate of 250L/min with voltage variations of 15, 20, and 24Volt in a 10L tank containing 3 pairs of aluminum (Al) electrodes connected with direct current. The output water from the electrocoagulation process flows into the settling basin and flows into the adsorption tank containing activated carbon adsorbent. Both of these continuous processes were the innovation of this research. Sampling was conducted every 10 minutes for analysis of turbidity, TSS, COD, and pH. The results of the output water analysis from the electrocoagulation process after passing through the precipitation and adsorption processes show that increasing the voltage results in the decrease of turbidity, TSS, and COD values, however, increased efficiency and pH. Thus, a voltage of 24V with a flow rate of 250mL/min resulted in the highest efficiency of the voltage variations (15, 20, and 24V) with a process time of 90 minutes with a turbidity impurity reduction efficiency value of 45.42% with a value of 41.36 NTU from 75.22NTU, TSS 91.42% with a decrease to 1827mg/L from 21288mg/L, and COD 55.56% with a COD value of 9600mg/L from 21600mg/L, and a process output water pH of 4.91, as well as a reduction in aluminum electrode weight of 1.024grams.
Co-Authors Adi Rizki Nugraha Ageng Priyambudi Ahmad Fauzan Al-Ghifari, Muhammad Z Alfiana Adhitasari Annisa Nurlatifah Annisaa Fitri Wulandari Asri Dwi Saffanah Bambang Soeswanto Chamidy, Harita N Dieni Nurul Fathiyyah Fatimah Fuad HM Gatot Subiyanto Ibrahim, Idham Kholid Indarti, Retno Jayanti, Retno Dwi Julviana, Arisya M Faizal Maulana, Fauzan I Mentik Hulupi Muhari, Emma Hermawati Mukhtar Gozali Nanda Liant Kumara Nidaa’ Rihhadatul ‘Aisya Komara Noviyani Noviyani Nurcahyo Nurcahyo, Nurcahyo Paramitha, Tifa Putri Utami Dita Cahya Renata, Calvin Aditya Restu Adji Alif Asyari Retno Indarti Rifki Ardiansyah Robby Sudarman Rosyadi, Anisa Fitriani Rusmana, Muchamad Raihan Surya Salsabila Nisrina Junaedi Saputra, Tri Reksa Setyaningrum, Sinta Sihombing, Rony P Sihombing, Rony Pasonang Suminar, Dian Ratna Suryadi, Joko Tamba, Alfonsius Perdija Tri Hariyadi Tri Reksa Saputra Triyoga Meiditama Putra Unung Leoanggraini Wahyuni, Ninik Lintang Edi Widya Fitria Nur Fauziah Wina Maulida Yunus Tonapa Sarungu Yusmardhany Yusuf Yusmardhany Yusuf