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All Journal Eksergi: Chemical Engineering Journal KOVALEN: Jurnal Riset Kimia Kinetika International Journal of Applied Technology Research Jurnal Difusi Journal of Green Science and Technology
Bambang Soeswanto
Department Of Chemical Engineering, Politeknik Negeri Bandung
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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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.
Utilization Of Sengon Wood Sawdust Waste as Esterified Cellulose-Based Bioadsorbent for CD(II) Wastewater Purification Fauzan, Rizky; Mujahidah, Nisa Rahmah; Nugraha, Teguh Aditya; Azzahra, Nasya; Paramitha, Tifa; Soeswanto, Bambang; Sihombing, Rony Pasonang
Journal of Green Science and Technology Vol 9 No 3 (2025): Journal of Green Science and Technology Vol. 9 No. 3 December 2025 Special Editio
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i3.10650

Abstract

Cadmium (Cd) is a heavy metal with high toxicity that can enter the body through contaminated food chains, so wastewater containing cadmium needs to be treated before being discharged into the environment. This study uses adsorption methods to reduce Cd(II) concentration in artificial wastewater by utilizing modified sengon wood sawdust cellulose as a bioadsorbent. Adsorption tests were conducted in batch mode at room temperature with constant stirring, and the results were analyzed using AAS. The objective of this study was to determine the optimum adsorption conditions using Response Surface Methodology (RSM) and to determine the adsorption capacity of the modified bioadsorbent based on the Freundlich or Langmuir adsorption isotherm models. The variations in bioadsorbent dose in this study were 2, 4, and 6 g/L; adsorption time variations were 30, 60, and 90 minutes; pH variations were 3, 4, and 5. Based on the design expert 13 RSM software, the optimum adsorption conditions for citric acid-modified bioadsorbent are a bioadsorbent dose of 3.957 g/L, time of 31.655 minutes, and pH of 4.968. For the EDTA-modified bioadsorbent, the optimum conditions were a bioadsorbent dose of 3.836 g/L, time of 30 minutes, and pH of 4.708. The results of the adsorption isotherm modeling indicate that the citric acid-modified and EDTA-modified bioadsorbents are more suitable for the Freundlich isotherm model due to their higher determination coefficient (R²). Thus, the adsorption capacities for the citric acid-modified and EDTA-modified bioadsorbents were determined to be 1.7828 mg/g and 1.5776 mg/g, respectively.
Co-Authors -, Alfiana Adhitasari Alfiana Adhitasari Asyari, Restu Adji Alif Azzahra, Nasya Budiastuti, Herawati - Clarisa, Shintiya Dianty Rosirda Dewi Kurnia Dini Sri Wahyuni Edi Wahyuni, Ninik Lintang Elizabeth, Lidya Endang Kusumawati Endang Widyastuti Fatah, Khalaida Fania Fauzan, Rizky Firmansyah, Taufik Akbar Gunawan, Sinna Chaerunnabila Hariyadi, Tri Haryadi - Herawati Budiastuti Hidayatulloh, Irwan Indarti, Retno Kartika Dian Pratiwi Luviana, Angely Marlina, Ari Muhari, Emma Hermawati Mujahidah, Nisa Rahmah Ngatin, Agustinus Nugraha, Teguh Aditya Nurcahyo Paramitha, Tifa Pratama, Yusuf Prihandini, Ghusrina Pullammanappallil, Pratap Putri, Alifhah Ananda Qobus, Muhammad Fauzy Ramadhana Rahmawati, Ranti Ramadhani, Laily lsna Retno Indarti Rispiandi Rispiandi Robby Sudarman Sihombing, Nova Sihombing, Rony Sihombing, Rony Pasonang Sudrajat Harris Abdulloh Suryadi, Joko Trirahayu, Dhyna Analyes Unung Leoanggraini Wahyuni, Ninik Lintang Edi Widiastuti, Endang Widyabudiningsih, Dewi Widyanti, Emmanuela Maria Yunus Tonapa Sarungu Yusuf, Yusmardhany Zulfa, Salma Indana