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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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EXTRACT OF COCOR BEBEK (KALANCHOE PINNATA) AS A CORROSION INHIBITOR Saputra, Tri Reksa; Ngatin, Agustinus
Jurnal Bahan Alam Terbarukan Vol 6, No 2 (2017): December 2017 [Nationally Accredited]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v6i2.7949

Abstract

In this study, Cocor Bebek leaves (Kalanchoe pinnata) extract is studied for metal corrosion inhibitor. 10.3 kg of K. Pinnata leaves produce concentrated extract of methanol, n-hexane and ethyl acetate as much as 65.7442, 36.1452, and 15.2711 g respectively. The concentrated extracts were then used to determine the rate of corrosion. Corrosion rate test showed that extract of ethyl acetate can reduce corrosion rate of carbon steel in NaCl 3.5% from 2.954 mpy to 0.963 and 0.923 mpy using 500 ppm and 1000 ppm of extract consecutively. Corrosion rate of Cocor Bebek extract at addition of 500 ppm ethyl acetate in the solution of NaCl 3.5% is decreasing immediately. It was found that the carbon steel corrosion rate decrease as much 4.857 for 6 hours and continuously shows sharp decline until 24 hours of corrosion time. Corrosion rate is slowly decreasing till reach 1.694 mpy at corrosion time of 168 hours.
RANCANG BANGUN SISTEM PENGOLAHAN AIR JERNIH DI KAMPUNG WISATA SABLON Rony Pasonang Sihombing; Agustinus Ngatin; Joko Suryadi; Retno Dwi Jayanti; Yunus Tonapa Sarungu; Robby Sudarman
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 5, No 1 (2022): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v5i1.35907

Abstract

Air bersih yang memadai secara kuantitas, kualitas dan kontinuitas merupakan kebutuhan penting untuk kelangsungan hidup manusia. Oleh karenanya diperlukan suatu instalasi pengolahan air untuk menunjang kebutuhan ini. Air tanah merupakan air yang belum mengalami proses pengolahan dengan kriteria kualitas air yang sudah mendekati air bersih. Metode pengolahan air yang dilakukan menggunakan metode filtrasi fisik dan kimia sebelum digunakan untuk kebutuhan sehari-hari. Jenis filter yang digunakan adalah filter benang ukuran 10 µm, filter polipropilen (PP) 10 µm  dan filter karbon aktif. Berdasarkan hasil rancangan, air yang dihasilkan pada sistem rancang bangun diantaranya adalah air dengan kualitas kesadahan 2.3 NTU, masa pakai filter benang 14 hari/bulan, filter PP 2.4 hari/bulan, dan filter karbon aktif 30 hari/bulan. Untuk kemudahan operasional, sistem rancang bangun untuk filter PP dibuat paralel 3 agar perawatan dapat dilakukan setiap minggu.
Pemanfaatan Hasil Kondensasi Oli Bekas Menjadi Bahan Aditif Aspal dengan Metode Sulfonasi Yunus Tonapa Sarungu; Agustinus Ngatin
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Pengaruh Pretreatment Larutan Zinkat terhadap Elektroplating Nikel-Krom pada Logam Aluminium Agustinus Ngatin; M Faizal; Fuad HM
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Pengaruh Konsentrasi Surfaktan Non-Ionik Terhadap Viskositas Perekat Polivinil Asetat Berbasis Air: Effect of Non-Ionic Surfactant on Water-Based Adhesive Viscosity Rony Pasonang Sihombing; Robby Sudarman; Agustinus Ngatin
KOVALEN: Jurnal Riset Kimia Vol. 6 No. 3 (2020): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2020.v6.i3.15278

Abstract

Substrate combining could be done by using adhesive. In Indonesia, especially industrial field, solvent base adhesives were still being developed. This kind of adhesive was not environmental friendly and not safe handling. Therefore, Polyvinyl Acetate (PVAc) water-based adhesive was prepared as an outcome of this research as one of solution to overcome the problem above. Effect of surfactant concentration on the viscosity was aimed at this research. Semi continuous polymerization with stirring motor rates on 50 – 500 rpm was used (optional). Pressure of 1 atm, 750C temperature, 5 – 6 hours reaction time for each was used as polymerization operation in this research. Vinyl Acetate Monomer (VAM), partial hydrolysis Polyvinyl Alcohol (PVOH), water, Ammonium Persulfate (APS) were prepared as raw material. NP-10 and NP-06 were non-ionic surfactants which each concentration was varied in this research. Water-based adhesive with NP-06 concentration variation resulting in viscosity from 98 m.Pa for 0.17 %wt concentration to 213 m.Pa for 0.68 %wt concentration. While NP-10 concentration variation resulting viscosity from 143 m.Pa for 0.17 %wt to 321 m.Pa for 0.68 %wt concentration. Therefore, adhesive with NP-10 surfactant concentration variable has a higher viscosity rate than NP-06 ones. Keywords: Water-based adhesive, non-ionic surfactant, adhesive viscosity
Konversi Karat Besi Menjadi Besi (III) Sulfat dan Pemanfaatannya Sebagai Adsorpsi Pewarna Tekstil: Iron Rust to Iron (III) Sulphate Conversion and the Utilization as Textile Dye Adsoption Ngatin Agustinus; Fatimah; Widya Fitria Nur Fauziah; Rony Pasonang Sihombing
KOVALEN: Jurnal Riset Kimia Vol. 6 No. 3 (2020): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2020.v6.i3.15308

Abstract

Iron rust was an iron oxide compound that was less attractive, dirty, brown in color, and could pollute the environment, causing water to turn brown. To minimize iron contamination, conversion was carried out into iron (III) sulfate which was useful as an adsorbent for textile dyes. The purpose of this study was to determine the effect of sulfuric acid concentration and volume of H2O2 10% used to convert iron rust into optimal iron (III) sulfate compounds. The method used was a laboratory experiment on a batch scale and the hydrate content in iron (III) sulfate was carried out by the gravimetric method and its ability as an adsorbent was carried out based on the adsorption of dyes using the spectrophotometric method. The results showed that a reactor filled with 3 grams of iron rust powder and 100 mL of sulfuric acid was stirred at 425 rpm at 80 0C for 30 minutes, added 15 ml 10% H2O2 followed by stirring and heating until the solution was saturated, cooled to form crystals. The crystalline yield in these conditions was the increase in sulfuric acid concentration which resulted in low process efficiency, namely 30.34% at 50% sulfuric acid concentration and 15 mL 10% H2O2. The addition of 10% H2O2 solution to 50 mL of 20% sulfuric acid solution and 3.0 grams of a carat as much as 5 mL-10 mL 10% H2O2 produced iron (III) sulfate with 26.53% process efficiency. Iron (III) sulfate is a white, light gray crystal with the chemical formula Fe2 (SO4)3.5 H2O which was a rhombic shaped crystal. and able to absorb the dye which showed that 1.0 g of iron (III) sulfate was able to absorb the highest amount of red dye in a volume of 100 mL of textile dye solution. Keywords: Iron rust, synthesis, iron (III), sulfuric acid, textile dyes
Kajian Pustaka Karakterisasi Perekat Polivinil Asetat Berbasis Air dengan Variabel Surfaktan: Water Base Polyvinyl Acetate Characterization with Surfactant Variable – a Review Rony Pasonang Sihombing; Dieni Nurul Fathiyyah; Nanda Liant Kumara; Agustinus Ngatin
KOVALEN: Jurnal Riset Kimia Vol. 7 No. 1 (2021): Edisi April
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2021.v7.i1.15448

Abstract

Polyvinyl acetate (PVAc) is an applicative polymer used as an adhesive material for one to another. These polymers can be synthesized through an emulsion polymerization process. In the industrial world, the process of making adhesive still involves environmentally unfriendly organic compounds containing xylene, benzene, and toluene. Therefore, water-based adhesive was introduced as an alternative to the PVAc synthesis solution. The aim of this literature review is to identify the type of surfactants used and analyze the PVAc characterization. This literature study focuses on the characterization of water-based PVAc with non-ionic nonylphenol (NP) surfactants including: NP-06, NP-10, NP 10 + 30, NP-30 and NP-40. Another surfactant used in this literature study is anionic surfactant Sodium Lauryl Sulfate (SLS) in units of Critical Micelle Concentration (CMC) including 1 CMC, 3 CMC, 5 CMC, 10 CMC, and 15 CMC. The result is a similarity in phenomena between the two types of surfactants. There is an increase in viscosity and a decrease in the value of the particle size as the surfactant increasing concentration used. However, in terms of the particle size, there is an optimal value where the specific NP surfactant concentration produces specific particle size with grit and at the specific SLS surfactant concentration produces relatively similar particle size.
Pengaruh Asam Itakonat terhadap Properti Polimer Perekat Akrilik Berbasis Air: Effect of Itaconic Acid on the Properties of Acrylic Water Base Adhesive Polymer Rony Pasonang Sihombing; Agustinus Ngatin
KOVALEN: Jurnal Riset Kimia Vol. 7 No. 2 (2021): Edisi Agustus
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2021.v7.i2.15507

Abstract

Acrylic-based polymer adhesive is a type of adhesive that can be used for pressure sensitive adhesive (PSA). Itaconic acid (IA) is a type of acid with 2 (two) OH groups which can form hydrogen bonds. The acrylic base can be used purely from its class. In some cases, however, the acrylic base can be used together with another base. Therefore acrylic-based adhesive with variable addition of itaconic acid was introduced in this study. In this application, the holding power property is one of the important parameters of a PSA. Therefore, holding power is the main parameter in this study. This research includes the preparation of tools and materials, mixing the main raw materials of acrylic monomer and itaconic acid with the types of surfactants and water, and product characterization. The polymerization process is carried out at a pressure of 1 atm with a temperature of 75°C - 80°C accompanied by stirring with a rotation rate of ± 500 rpm. The characterization of this research resulted in a PSA product with a holding power of 2 kg for 30 seconds to 620 minutes. While the resulting peel strength is 1.12 kgf / inc to 0.76 kgf / inc. Keywords: itaconic acid, acrylic PSA, holding power
EKSTRAKSI KULIT BUAH MANGGIS SECARA REFLUK DAN SOKLETASI MENGGUNAKAN PELARUT ETANOL Agustinus Ngatin; Mentik Hulupi
Prosiding Semnastek PROSIDING SEMNASTEK 2014
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Ekstrak kulit buah manggis mengandung xanthon dan antosianin. Xanthon merupakan senyawafenol yang dapat digunakan sebagai antioksidan yang terdapat dalam kulit buah manggis dengankadar  yang  tinggi  dan  memiliki  sifat  yang  baik  dan  bermanfaat  bagi  tubuh Antosianin  adalahkelompok  pigmen  yang  berwarna  merah  sampai  biru  yang  tersebar  dalam  tanaman. Pigmenantosianin berbentuk glikosida dan menjadi penyebab warna merah, biru, dan violet serta dapatmengalami perubahan selama penyimpanan dan pengolahan. Ekstrak kulit buah manggis dapatdiambil melalui proses ekstraksi. Penelitian ini bertujuan mengambil ekstrak secara sokletasi danrefluk menggunakan  pelarut etanol, menentukan pengaruh rasio serbuk kulit manggis dan etanolterhadap  ekstrak,  dan  menentukan  pengaruh  waktu  proses  dan  pengadukan  terhadap  ekstrak.Metode  prnelitian  dilakukan  secara  eksperimen  di  laboratorium  dengan  metode  sokletasi  danrefluk..  Kulit  manggis  dikeringkan,  dihancurkan,  dan  pengayakan  sehingga  diperoleh  serbukdengan ukuran 0,22 mm. Serbuk kulit manggis diekstraksi menggunakan pelarut etanol denganrasio (1:8 s.d 1: 12)  gram per mL, variasi waktu ekstraksi (30 s.d 80) menit.  Hasil penelitianmenunjukkan  bahwa  proses  ekstraksi  secara  refluk  menghasilkan  jumlah  ekstrak  lebih  tinggidaripada  secara  sokletasi  dalam  rasio  serbuk  kulit  manggis  dan  etanol  1:7,5  sampai  1:12,5dengan  yield  11,25%.  Proses  ekstraksi secara  refluk pada  suhu  600C  dengan  waktu  60  menitmenghasilkan ekstrak 1,5426 g atau 6,17% dengan rasio serbuk kulit manggis dan etanol 1:11.Pada rasio ini dengan kondisi proses ekstraksi secara refluk dengan pengadukan 700 rpm, suhu600C dan waktu proses 80 menit menghasilkan yield 16,71% dan tanpa pengadukan 12,66%.Ekstrak dalam larutan asam berwarna kuning dan basa berwarna coklat
Penggunaan metode ekstraksi maserasi dan partisi pada tumbuhan cocor bebek (kalanchoe pinnata) dengan kepolaran berbeda Tri Reksa Saputra; Agustinus Ngatin; Yunus Tonapa Sarungu
Jurnal Kimia Fullerene Vol 3 No 1 (2018): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (453.753 KB) | DOI: 10.37033/fjc.v3i1.26

Abstract

Has conducted research of the preparation Cocor Bebek plants as raw materials for corrosion test by using two methods of extraction are maceration and partition. Maceration process is done by using methanol, which will then be concentrated by using a rotary evaporator to produce concentrated methanol extract. The next stage is the process of partitioning using a solvent n-hexane and ethyl acetate, and of the steps that have been made, from the fresh leaves Cocor Bebek generated as much as 10.3 kg of concentrated methanol extract as much as 65.7442 g, n-hexane extract as much as 36.1452 g, and the ethyl acetate extract as much as 15.2711 g.
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 Ninik Lintang Edi Wahyuni 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 Widya Fitria Nur Fauziah Wina Maulida Yunus Tonapa Sarungu Yusmardhany Yusuf Yusmardhany Yusuf