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All Journal Jurnal Teknik Kimia USU Eksergi: Chemical Engineering Journal KOVALEN: Jurnal Riset Kimia Jurnal Kimia Riset JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia FLUIDA JKPK (Jurnal Kimia dan Pendidikan Kimia) Fullerene Journal of Chemistry Kumawula: Jurnal Pengabdian Kepada Masyarakat International Journal of Applied Technology Research Jurnal Teknologi Jurnal Teknik Kimia USU Industrial Research Workshop and National Seminar Journal Serambi Engineering (JSE) Journal of Green Science and Technology
Sihombing, Rony Pasonang
Jurusan Teknik Kimia, Politeknik Negeri Bandung
Aerospace Engineering 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 Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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Potensi Ekstrak Kunyit sebagai Inhibitor Korosi Ramah Lingkungan untuk Baja Karbon Rendah Sajida, Gita Nur; Krista, Gustin Mustika; Sari, Hermin Kartika; Taufiqurohim, Teguh; Ferawati, Yohana Fransiska; Sihombing, Rony Pasonang
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7483

Abstract

Corrosion is a significant metal degradation problem causing substantial economic losses, particularly in the oil and gas industry. Traditional chromate-based inhibitors are toxic, spurring the search for eco-friendly alternatives. This article explores the potential of Curcuma longa (turmeric) extract as a natural corrosion inhibitor for low-carbon steel plates in acidic and basic media. This study tests turmeric extract on low-carbon steel plates in HCl and NaOH media using immersion test (weight loss). The active compound curcumin in turmeric extract effectively inhibits corrosion. Its effectiveness is highly dependent on the solvent type and concentration; 0.25% NaOH yields up to ~87% effectiveness at 1000 ppm turmeric concentration, with a corrosion rate of 0.697 mdd, significantly outperforming 0.25% HCl which only reaches ~22% at similar concentrations with a corrosion rate of 133.99 mdd. Increasing NaOH concentration to 0.50% drastically enhances initial effectiveness, reaching ~63% at 100 ppm, and 90% at 400 ppm, with the corrosion rate dropping to 0.668 mdd. 
Phosphoric Acid-Activated Carbon From Coffee Grounds and Fly Ash For Efficient Laundry Wastewater Adsorption Muhari, Emma Hermawati Muhari; Silalahi, Rafael Leonardo; Puspita, Nina; Maryani, Anisya Sri; Sihombing, Rony Pasonang; Adhitasari, Alfiana; Kurnia, Dianty Rosirda Dewi
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10649

Abstract

Laundry waste that is directly discharged into water bodies causes pollution due to its chemical content, such as phosphate. The adsorption method is chosen as an option to reduce the phosphate content in laundry waste due to its simple preparation and low cost. The adsorbent used is a mixture of coffee grounds and fly ash. The use of coffee grounds is based on the increasing waste from coffee shops, thus being utilized as an adsorbent. The aim of this study is to determine the effectiveness of coffee grounds and fly ash with the best combination of composition and contact time using the adsorption method. The stages begin with the preparation of coffee grounds and fly ash through carbonization and activation using H3PO4. The variations performed consisted of variations in the composition of coffee grounds and fly ash with a total of 1 gram in ratios of 1:4; 2:3; 1:1; 3:2; 4:1 and contact time variations of 15 minutes, 30 minutes, 45 minutes, 60 minutes, and 75 minutes. Based on the research results, the highest percentage of removal was found in the composition variation of coffee grounds and fly ash with a ratio of 1:4 for 75 minutes.
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
Signifikansi Kadar Kafein pada Kopi Kerinci Robusta dalam Berbagai Interval Waktu Soeswanto, Bambang; Yusuf, Yusmardhany; Sihombing, Rony Pasonang; Suryadi, Joko; Luviana, Angely; Asyari, Restu Adji Alif; Adhitasari, Alfiana
Eksergi Vol 20 No 3 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i3.10353

Abstract

Kopi Kerinci Robusta merupakan salah satu kopi yang digemari masyarakat Indonesia yang tumbuh di daerah Kerinci. Selama ini masyarakat hanya mengenal kopi ini untuk dinikmati saja, tanpa memperhitungkan jumlah kandungan kafein yang akan terkonsumsi. Penelitian ini bertujuan untuk mengetahui rasio terbaik pada ekstraksi kopi Kerinci Robusta menggunakan pelarut etil asetat. Rasio umpan: pelarut (b/v) yang digunakan adalah 1:5; 1:7.5; 1:10; 1:12.5. Pelarut yang digunakan dalam penelitian ini adalah etil asetat. Metode penelitian yang digunakan adalah metode ekstraksi dengan kondisi operasi 50⁰C selama 2 jam dengan interval pengambilan sampel setiap 20 menit. Kadar kafein hasil penelitian diukur dengan menggunakan spektrofotometri pada panjang gelombang 273 nm. Hasil penelitian menunjukkan bahwa rasio optimum adalah rasio 1:5 yang menghasilkan kadar kafein sebesar 3737.41 ppm.
Utilization of Coffee Grounds and Fly Ash as Adsorbents to Reduce Phosphate Content in Laundry Wastewater Yusuf, Yusmardhany; Fatah, Khalaida Fania; Gunawan, Sinna Chaerunnabila; Soeswanto, Bambang; Sihombing, Rony Pasonang; Adhitasari, Alfiana
Eksergi Vol 22 No 1 (2025)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i1.12880

Abstract

Industrial laundry wastewater contains 70-80% phosphate which can cause environmental pollution and trigger the growth of algae blooms or eutrophication if it is discharged into the environment. The adsorption method was chosen to reduce the phosphate content in laundry waste because it is relatively simple and low cost. The adsorbent used can use coffee grounds and fly ash, where coffee grounds have 47.8-58.9%. The composition used for the adsorption process is a ratio of coffee grounds: fly ash (w/w) of 1:0 and 1:1. Contact time in the adsorption process varies between 30 minutes, 60 minutes, 90 minutes, 120 minutes, 150 minutes. Based on research results, the best reduction in phosphate levels from laundry waste was 45.88%, where the initial phosphate level in the waste was 10.2 mg/L. Apart from that, the efficiency of reducing COD levels with the best removal efficiency was 80.39% with the initial COD content in the waste being 4080 mg/L. The best composition for testing laundry waste is 1:1 coffee grounds and fly ash (w/w) and the best contact time for testing laundry waste is 150 minutes
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.
Pengaruh Kondisi Operasi Terhadap Kualitas Aluminium Stearat dalam Reaktor Batch Suminar, Dian Ratna; Lingga Permana, Rezza; Amellia, Yashinta; Ghozali, Mukhtar; Sudarman, Robby; Sihombing, Rony Pasonang
Jurnal Teknik Kimia USU Vol. 15 No. 1 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i1.22678

Abstract

Aluminum stearate has the same potential as aluminum soap as a lubricant additive that can be developed towards standardization of commercial products. The research stages consist of: (1) Making sodium soap through saponification reaction (stearic acid and NaOH), (2) Replacing sodium metal with aluminum metal through trans-saponification reaction, (3) Purifying the product by washing with distilled water, (4) Separation and drying of the product using a Buchner funnel and oven at 100 oC for 3 hours, (5) Analytical test of aluminum stearate product: testing melting point, water content, ash content, free fatty acid content, quantitative content using AAS spectrophotometer, and solubility test. The results of the study showed that aluminum stearate can be made through 2 reaction stages, namely saponification and trans-saponification in the form of a white powder with a melting point of 115.7 oC, ash content of 13.93%, maximum free fatty acid content of 0.9372%, and insoluble in water and chloroform; partially soluble in n-hexane and toluene waste; and soluble in paraffin, methanol, and nitric acid.
Pengaruh Kondisi Operasi Terhadap Kualitas Aluminium Stearat dalam Reaktor Batch Suminar, Dian Ratna; Lingga Permana, Rezza; Amellia, Yashinta; Ghozali, Mukhtar; Sudarman, Robby; Sihombing, Rony Pasonang
Jurnal Teknik Kimia USU Vol. 15 No. 1 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i1.22678

Abstract

Aluminum stearate has the same potential as aluminum soap as a lubricant additive that can be developed towards standardization of commercial products. The research stages consist of: (1) Making sodium soap through saponification reaction (stearic acid and NaOH), (2) Replacing sodium metal with aluminum metal through trans-saponification reaction, (3) Purifying the product by washing with distilled water, (4) Separation and drying of the product using a Buchner funnel and oven at 100 oC for 3 hours, (5) Analytical test of aluminum stearate product: testing melting point, water content, ash content, free fatty acid content, quantitative content using AAS spectrophotometer, and solubility test. The results of the study showed that aluminum stearate can be made through 2 reaction stages, namely saponification and trans-saponification in the form of a white powder with a melting point of 115.7 oC, ash content of 13.93%, maximum free fatty acid content of 0.9372%, and insoluble in water and chloroform; partially soluble in n-hexane and toluene waste; and soluble in paraffin, methanol, and nitric acid.
Co-Authors -, Alfiana Adhitasari Adi Rizki Nugraha Ageng Priyambudi Ahmad Fauzan Alamsari, Jasinta Putri Alatif, Ikhsan Akmal Alfiana Adhitasari Alisya Nurbaits Althafa Muntaqin Amellia, Yashinta Anindita, Faradila Anisa, Vira Rizki Annisa Nurlatifah Asyari, Restu Adji Alif Azzahra, Rafila Chika Bambang Soeswanto binti Jamaluddin, Jamarosliza C. Yudha Hidayatulloh Cecep Yudha Hidayatullah Dieni Nurul Fathiyyah Fajriati, Ramadhana Suci Fatah, Khalaida Fania Fatimah Fauzan, Rizky Ferawati, Yohana Fransiska Fitriani, Desti Ghozali, Mukhtar Gunawan, Sinna Chaerunnabila Hariyadi, Tri Hidayatulloh, Irwan Ibrahim, Idham Kholid Indarti, Retno Jayanti, Retno Dwi Keryanti, Keryanti Khalisha, Keira Kharisma, Luthfiana Krista, Gustin Mustika Kurnia, Dianty Rosirda Dewi Lingga Permana, Rezza Lutfiah Rahmasari Luviana, Angely Malik, Dava Maulana Marlina, Ari Maryani, Anisya Sri Muhammad Fadly Wiryawan Kautsar, Muhari, Emma Hermawati Muhari, Emma Hermawati Muhari Mukhtar Gozali Nanda Liant Kumara Ngatin, Agustinus Nidaa’ Rihhadatul ‘Aisya Komara Nidaulhusna, Anisa Ninik Lintang Edi Wahyuni Nurbaits, Alisya Nurcahyo Nurcahyo, Nurcahyo Nurhasanah, Santy Nurulgina, Rahma Paramitha, Tifa Permanasari, Ayu Ratna Permatasari, Rahma Puspa Puspita, Nina Putri Utami Dita Cahya Putri, Angelina Rahmawati, Sri Puji Ramadan, Naufal Alip Cahya Ramadhan, Muhammad Zikri Ramadhani, Isma Afifah Renata, Calvin Aditya Restu Adji Alif Asyari Retno Indarti Reynaldi, Randi Rijal Muyasar Fahmi Risnandar, Tiara Devita Rispiandi Rispiandi Robby Sudarman Rusmana, Muchamad Raihan Surya Sajida, Gita Nur Salsabila Nisrina Junaedi Salsabila, Intan Salsabila, Iva Najwa Salsabila, Shafira Salsabilla, Iva Najwa Sari, Hermin Kartika Sari, Radianti Novita Silalahi, Rafael Leonardo Solehuddin Al-Ayubi Solehudin Al-Ayubi Sudrajat Harris Abdulloh Suminar, Dian Ratna Suryadi, Joko Tamba, Alfonsius Perdija Teguh Taufiqurohim Tika Paramitha Tri Hariyadi Unung Leoanggraini Wahyu Wibisono Wahyuni, Ninik Lintang Edi Widya Fitria Nur Fauziah Wina Maulida Yulistiani, Fitria Yunus Tonapa Sarungu Yusmardhany Yusuf Yusmardhany Yusuf Yusuf, Yusmardhany Zafarina, Alizza Asry