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All Journal JURNAL KIMIA SAINS DAN APLIKASI Journal of Physics: Theories and Applications Wikrama Parahita : Jurnal Pengabdian Masyarakat Jurnal Rekayasa Proses ASEAN Journal of Chemical Engineering JESCEE- Journal of Emerging Supply Chain, Clean Energy, and Process Engineering
Agung Nugroho
Department Of Chemical Engineering, Universitas Pertamina, Jalan Teuku Nyak Arief, Simprug, Kebayoran Lama, Jakarta 12220
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Synthesis of water-soluble chitosan inhibitor from shrimp shells and its corrosion rate on mild steel in acidic solution Nur Layli Amanah; Ika Dyah Widharyanti; Agung Nugroho
Journal of Physics: Theories and Applications Vol 5, No 1 (2021): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v5i1.50402

Abstract

Synthesis of WSCI (Water Soluble Chitosan Inhibitor) from shrimp shell waste is carried out through demineralization, deproteination, and deacetylation processes. WSCI is obtained from monomer termination and H2O2 assistance. WSCI was characterized using Fourier Transform Infrared Spectroscopy (FTIR) and the degree of deacetylation was determined using the baseline method. The effect of adding WSCI to low carbon steel SS400 with a 1 M HCl corrosive environment was studied using the weight loss method at various concentrations and temperatures. The overall results of the research show that WSCI synthesis used in the prevention of corrosion have an inhibition efficiency of up to 74.6% at a concentration of 200 ppm at a temperature of 28oC. Inhibition efficiency and corrosion rate are known to increase with increasing WSCI concentration and corrosion rate decreasing with increasing temperature.
Adsorption study of mango peel activated carbon as iron removal for batik waste industry Agung Nugroho; Nur Layli Amanah; Revo Gilang Firdaus
Jurnal Rekayasa Proses Vol 16, No 1 (2022)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.69404

Abstract

A B S T R A C TMango peel waste which has a carbon functional group was converted to activated carbon. The as-synthesized activated carbon (AC) was then utilized as an adsorbent for batik waste which contains heavy metal substances such as Fe2+. The purpose of this study was to determine the optimum process variation in absorbing heavy metal ion Fe contained in batik waste. Four variation methods of activated carbon synthesis were explored to determine the most suitable method of AC synthesis. The results showed that the sample synthesized using a combination physical-chemical-physical process was the best process variation resulting in percentage removal of Fe2+ of 84.81%. FTIR showed that the functional groups in mango peel were visible for all variations of the process, namely hydroxyl (-OH) derived from cellulose and hemicellulose and carboxyl (-COOH) derived from pectin. The adsorption study showed that the most suitable isotherm for all process variations was Langmuir with an R2 value of 0.9999 for the MPAC-4 sample. The adsorption mechanism is physisorption with a value of E < 8 kJ/mol based on the D-R isotherm and has the largest adsorption capacity of Qmax 8.2 mg/g.Keywords: batik waste; adsorption; activated carbon; iron waste; mango peelABSTRAKLimbah kulit mangga yang memiliki gugus fungsi karbon dapat dikonversi menjadi karbon aktif. Karbon aktif hasil sintesis (AC) tersebut selanjutnya dimanfaatkan sebagai adsorben limbah batik yang mengandung zat logam berat seperti Fe2+. Tujuan dari penelitian ini adalah untuk mengetahui variasi proses optimum dalam menyerap ion logam berat Fe yang terkandung dalam limbah batik. Terdapat 4 variasi metode sintesis karbon aktif yang diteliti untuk menentukan metode sintesis AC yang paling cocok. Hasil penelitian menunjukkan bahwa sampel yang disintesis menggunakan kombinasi proses fisika-kimia-fisika merupakan variasi proses terbaik dengan persentase penyisihan Fe2+ sebesar 84,81%. Analisis FTIR menunjukkan bahwa gugus fungsi pada kulit mangga terlihat untuk semua variasi proses, yaitu hidroksil (-OH) yang berasal dari selulosa dan hemiselulosa dan karboksil (-COOH) yang berasal dari pektin. Studi adsorpsi menunjukkan bahwa isoterm yang paling cocok untuk semua variasi proses adalah Langmuir dengan nilai R2 = 0,9999 untuk sampel MPAC-4. Mekanisme adsorpsi adalah fisisorpsi dengan nilai E < 8 kJ/mol berdasarkan isoterm DR dan memiliki kapasitas adsorpsi terbesar Qmax 8,2 mg/g.Kata kunci: limbah batik; adsorpsi; karbon aktif; limbah besi; kulit mangga
Pelatihan Pembuatan Dye Sensitized Solar Cell (DSSC) Sederhana untuk Siswa SMP 161 Jakarta Agung Nugroho; Sylvia Ayu Pradanawati; Yose Fachmi Buys; Ayu Dahliyanti; Dita Floresyona; Yudi Rahmawan; Tirta Rona Mayangsari; Paramita Jaya Ratri; Gede W.P. Adhyaksa
Wikrama Parahita : Jurnal Pengabdian Masyarakat Vol. 7 No. 1 (2023): Mei 2023
Publisher : Universitas Serang Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30656/jpmwp.v7i1.5445

Abstract

Perkembangan teknologi bersih menjadi isu yang saat ini sedang digencarkan pemerintah dalam upaya 100% elektrifikasi di Indonesia. Solar Panel merupakan salah alat yang paling populer dalam era teknologi baru terbarukan. Pengenalan solar panel di siswa bangku sekolah dapat mening¬kat¬kan pengetahuan dan pengalaman siswa dalam mengaplikas¬ikan energi baru terbarukan. Kurikulum Merdeka Belajar mendukung pengaplikasian teori secara hands on kepada siswa. SMP 161 dipilih karena merupakan sekolah adiwiyata yang menjadi mercusuar sekolah lain di Jakarta dalam hal lingkungan hidup. Dalam pelatihan ini, sel surya murah berbasis Dye Sensitized Solar Cell (DSSC) dibuat sendiri oleh siswa dan dipandu oleh tim dosen Universitas Pertamina. Menjelang akhir kegiatan, 100% siswa berhasil membuat DSSC dengan variasi dye dari jus blackberry dan buah naga merah. Dengan melakukan praktik langsung, siswa dapat memperoleh pengalaman dan pengetahuan baru mengenai DSSC.
Comparison of Maseration and Sonication Method on Flavonoid Extraction from Mango Leaves: Effect of Solvent Ratio Alifiana Permata Sari; Nur Layli Amanah; Awalia Wardatullathifah; Agung Nugroho
ASEAN Journal of Chemical Engineering Vol 22, No 2 (2022)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.74204

Abstract

Mango leaf extract has proven to contain flavonoids that serve as antioxidants. In this study, a comparison between traditional maceration and sonication on flavonoid extraction from mango leaf was investigated. The various ratios of ethanol and acetone were utilized as solvents (1:5, 1:10, and 1:15). The sonication process, which uses an ultrasonic cleaning bath set at 40 oC, takes 30 minutes as contrasted to the maceration procedure of 36 hours treatment at room temperature. The flavonoid test using aluminum (III) chloride (AlCl3) colorimetric technique shows that acetone provides greater solvent power than ethanol. According to this study, the optimal ratios for the maceration and sonication procedures are 1:10 and 1:15, respectively. The maceration process resulted in the optimum extract of 0.186 mgQE/g dry leaves. Meanwhile, using a 1:15 acetone solvent ratio and the sonication method, the highest concentration of flavonoid components was discovered, reaching 0.143 mgQE/g dry material with 54 times shorter time.
A Comparative Study on The Electrochemical Properties of Hydrothermal and Solid-State Methods in The NCM Synthesis for Lithium Ion Battery Application Sylvia Ayu Pradanawati; Eduardus Budi Nursanto; Afif Thufail; Ahmad Zaky Raihan; Sugianto Sugianto; Haryo Satriya Oktaviano; Hanida Nilasary; Achmad Subhan; Agung Nugroho
ASEAN Journal of Chemical Engineering Vol 22, No 2 (2022)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.74209

Abstract

In this article, we report and compare the synthesis method of the active cathode materials based on nickel‐cobalt‐manganese (NCM) for lithium-ion battery application. We evaluate the hydrothermal and solid-state reaction method in NCM-622 synthesis, the material characterizations, and the battery performance. Based on the analytical results using X-ray diffraction (XRD), particles synthesized using hydrothermal and solid-state methods exhibit a highly crystalline NCM phase. NCM particles synthesized using solid-state reaction exhibit high-rate performance up to 10 C. The electrochemical impedance spectroscopy analysis shows that the charge transfer resistance (Rct) of NCM synthesized by the solid-state reaction (SSR) method was 25.9% lower than hydrothermal. Meanwhile, the ionic diffusivity of the SSR sample was 38.5% higher than the hydrothermal sample. These two factors lead to better performance when tested in a lithium-ion battery.
Acid Treatment on Carbonate Rock: An Effect of HCL Concentration on Rock Properties and Fluid Flowrates Agung Nugroho; Nur Layli Amanah; Hary Perdana Kamal; Syahreza Angkasa
Journal of Emerging Supply Chain, Clean Energy, and Process Engineering Vol 1 No 1 (2022): Journal of Emerging Supply Chain, Clean Energy, and Process Engineering
Publisher : Universitas Pertamina

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57102/jescee.v1i1.2

Abstract

A series of analyses techniques were performed to study the influence of different acid concentrations on the rock properties during the acidizing process. Based on the Thin section and Routine Core Analysis (RCA), the calcite content have effect on the reservoir quality from the aspect of rock-fluid properties. In this paper, the physical and mineralogical responses to rock acidizing of carbonate rock are evaluated. This study found that calcite content decreases approximately 25% from the total calcite content of rock samples after the addition of HCl. Scanning Electron Microscope (SEM) Analysis show that samples treated using HCl 15% provide a wider pore size distribution, resulting in the increasing permeability fluid flow rate
Study of Efficiency and Reaction Rates Dechlorination of Nata De Coco Wastewater Using Sodium Thiosulfate Alifiana Permata Sari; Fadila Arum Rhamadani; Nur Layli Amanah; Agung Nugroho
Journal of Emerging Supply Chain, Clean Energy, and Process Engineering Vol 1 No 2 (2022): Journal of Emerging Supply Chain, Clean Energy, and Process Engineering
Publisher : Universitas Pertamina

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57102/jescee.v1i2.17

Abstract

Chemical reduction with sodium thiosulfate is commonly used to dechlorinate chlorinated waste. U.S. Environmental Protection Agency recommends sodium thiosulfate (Na2S2O3) as a dechlorinating agent for waste samples containing residual chlorine before being released into the environment or entering the distribution system. However, sodium thiosulfate's efficiency and chlorination kinetics at different concentrations are still unknown due to a lack of information on chlorination kinetics. The study was conducted by determining the number of efficient doses of sodium thiosulfate and observing chlorination kinetics using sodium thiosulfate as a dechlorination agent observed at different stoichiometric ratios (1x, 1.5x, and 2x). Sodium thiosulfate at a stoichiometric dose of 2x can reduce chlorine residue by up to 0.4 ppm. The regression analysis of and constant rate are used in the kinetic analysis of sodium thiosulfate dechlorination processes. The kinetics of the chlorination process employing sodium thiosulfate is first order to the total concentration of chlorine in solution at a stoichiometric dosage of 2x, according to the findings.
Synthesis and Electrochemical Properties of SnO2 Composited Activated Carbon from Coffee Ground Waste for Supercapacitor Applications Agung Nugroho; Muhammad Reza Wirayudha Pratama; Hans Kristianto; Haryo Satriya Oktaviano; Arenst Andreas Arie; Ratna Frida Susanti
Jurnal Kimia Sains dan Aplikasi Vol 26, No 8 (2023): Volume 26 Issue 8 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.8.293-299

Abstract

Biomass has been considered an alternative source of electrode materials. Converting biomass into activated carbon is one of the possible approaches. Coffee ground waste is abundant as the world’s coffee-drinking culture grows. This paper describes a study that converted coffee grounds into activated carbon and tested its feasibility for electrode materials. We use a simple pyrolysis technique (800°C) to synthesize activated carbon from waste coffee grounds, with potassium hydroxide (KOH) as an activator. Tin oxide (SnO2), which has a high theoretical capacity, was impregnated into the carbon framework using a hydrothermal method operating at 180°C for 2 hours. The X-ray diffraction (XRD) pattern and Fourier transform infrared spectroscopy (FTIR) results show that SnO2 was successfully impregnated into the carbon structure. Raman analysis also shows that the carbon structure of the activated carbon still retains despite the presence of the metal oxide during the hydrothermal synthesis. Furthermore, electrochemical measurements utilizing the galvanostatic method using a three-electrode system demonstrated that the specific capacitance of the material increased by approximately 106% at 5 A/g following SnO2 impregnation. Long cycle testing further demonstrates that including SnO2 in the carbon, structure may sustain outstanding performance even at high current densities of 5 A/g for 100 cycles with 99% capacity retention. The results demonstrate the possibility of activated carbon from coffee ground waste composited with tin oxide as supercapacitor electrodes.
Co-Authors Achmad Subhan Afif Thufail Ahmad Zaky Raihan Alifiana Permata Sari Alifiana Permata Sari Arenst Andreas Arie Awalia Wardatullathifah Ayu Dahliyanti Dita Floresyona Eduardus Budi Nursanto Fadila Arum Rhamadani Gede W.P. Adhyaksa Hanida Nilasary Hary Perdana Kamal Haryo Satriya Oktaviano Haryo Satriya Oktaviano Ika Dyah Widharyanti Kristianto, Hans Muhammad Reza Wirayudha Pratama Nur Layli Amanah Nur Layli Amanah Nur Layli Amanah Nur Layli Amanah Paramita Jaya Ratri Ratna Frida Susanti Revo Gilang Firdaus Sugianto Sugianto Syahreza Angkasa Sylvia Ayu Pradanawati Tirta Rona Mayangsari Yose Fachmi Buys Yudi Rahmawan