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All Journal JURNAL KIMIA SAINS DAN APLIKASI Research Report - Engineering Science Seminar Nasional Teknik Kimia Kejuangan JURNAL INTEGRASI PROSES ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry
Arenst Andreas
Parahyangan Catholic University
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology Other

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Synthesis of Nanosilica Originated from Fly Ash using Sol-Gel Method with Methanol as Solvent Daniel Alvin Chaidir; Hans Kristianto; Arenst Andreas
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Coal fly ash could harm environment and dangerous for human health. Coal fly ash could be used as silica precursor because it contains silica in considerable amount. Method that used to isolate silica is alkaline fusion which used NaOH. The goals are to determine the effect of precursor and solvent ratio (1:9; 1:16; 1:23) and ageing time (3, 6, and 9 days) to particle size and characteristic obtain. Procedure of separating silica begin from burnt fly ash at 750°C, dissolved in HCl, filtered the solution to obtain the precipitate, dried the precipitate and dissolved in NaOH to obtained Na2SiO3. Procedure of nanosilica synthesis was carried out with mixed methanol, water, ammonia, and precursor while stirred for 8 hours, ageing for few days, followed with separate solution using centrifugation method. Product obtained was then characterized using SEM-EDS and XRD. From the results obtained, the ratio of precursor and solvent concentration would affect the particle size obtained and the amount of the product. The highest amount of Si obtained when ratio of precursor : methanol = 1:23 and ageing time 9 days which is 22.64%. Meanwhile, ageing time would affect the particle size distribution obtained. The product also known has amorphous structure.
Sintesis Karbon Aktif dari Kulit Jeruk dengan Aktivasi Menggunakan Subkritik Air Arenst Andreas
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2015: Prosiding SNTKK 2015
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Low-cost and environmental friendly activated carbon was synthesized from orange peels (citrus nobilis var. microcarpa) which activated by subcritical water. Orange peels were first carbonized in an electrical furnace at temperature of 800oC for 2 hours. Activation process of the carbonized orange peel were done in 1 hour inside a reactor at temperature of 200oC and pressure from 120 to 220 bar. Mesoporous activated carbon with highest surface area was obtained at pressure of 170 bar, where the surface area was 491.840 m2/g. The orange peel derived activated carbons were tested in the adsorption of methylene blue (MB) from aqueous phase. The adsorption study was done under batch condition with various initial concentration of MB solution. The initial concentrations of MB used were 2, 4, 6, 8 and 10 ppm. The adsorption of MB followed the pseudo-second-order rate equation, and fit well to the Temkin isotherm, while the adsorption mechanism was affected by the intraparticle diffusion and surface diffusion.
Studi Adsorpsi Biner Zat Warna dengan Karbon Aktif Boas Tua Hotasi; Yosep Christian; Hans Kristianto; Arenst Andreas Arie
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Pyrolysis Carbonization of Sago Starch Haryadi Wibowo; Arenst Andreas Arie; Budi Husodo Bisowarno
JURNAL INTEGRASI PROSES VOLUME 10 NOMOR 1 JUNI 2021
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jip.v10i1.11289

Abstract

Battery requirements are increasing over time, the anode for sodium ion batteries (SIB) can use amorphous carbon. Carbon synthesis is carried out via pyrolysis. Research on the synthesis of carbon derived from sago starch is still rare. This study aims to determine the carbon characteristics of sago starch treated with nitrogen doping according to the SIB anode by taking into account the morphology, size distribution, material structure, material composition, and the distance between layers. The carbonization method used in this research is the pyrolysis process at 900 o C for 1 hour. Variations in the experiment were carried out through direct pyrolysis process with variations of urea against starch 3:1, 2:1, and pure starch. The experimental results were analysis using SEM (EDS) and XRD. The results showed that the pyrolysis process doped with nitrogen with a ratio of 3:1 urea had an interlayer distance of 0.353304 nm, 2:1 had an interlayer of 0.368059 nm, and 0.390178 nm of pure sago starch. This value indicates that carbon is a non-graphite material (> 0.3354 nm). The carbon produced from pyrolysis produces carbon that is amorphous and has a similar shape, which is like wood.
PENGARUH RASIO IMPREGNANT ZNCL2 DAN TEMPERATUR KARBONISASI TERHADAP LUAS PERMUKAAN KARBON AKTIF DARI KULIT JERUK Hans Kristianto; Arenst Andreas Arie
JURNAL INTEGRASI PROSES VOLUME 5 NOMOR 3 DESEMBER 2015
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (862.135 KB) | DOI: 10.36055/jip.v5i3.260

Abstract

Pada penelitian ini dilakukan sintesis karbon aktif dari kulit jeruk (Citrus nobilis var microcarpa) dengan menggunakan aktvasi kimia ZnCl2. Penelitian ini bertujuan untuk mengetahui pengaruh rasio impregnant dan temperatur karbonisasi terhadap luas permukaan karbon aktif yang diperoleh. Rasio kulit jeruk terhadap impregnant divariasikan 4:1, 2:1, 1:1, 1:2, dan 1:4, dengan temperatur karbonisasi pada 400, 500, dan 600˚C. Karbonisasi dilakukan dengan menggunakan electrical tubular furnace dengan atmosfer nitrogen selama 1 jam. Luas permukaan karbon aktif dianalisa dengan menggunakan Micromeritics apparatus NOVA 1000/3200e Quantachrome. Diperoleh bahwa temperatur dan rasio impregnant cenderung berpengaruh terhadap luas permukaan karbon aktif yang diperoleh. Pada rasio impregnant 4:1 sampai 1:2, temperatur karbonisasi terbaik pada 500˚C, akan tetapi pada rasio 1:4, luas permukaan yang diperoleh relatif sama untuk setiap variasi temperatur. Luas permukaan yang diperoleh relatif tinggi terutama jika dibandingkan dengan karbon aktif lain yang disintesis dari kulit buah-buahan. Luas permukaan karbon aktif terbesar diperoleh pada rasio impregnant 1:4 dan temperatur 600˚C dengan luas permukaan mencapai 1198,16m2/g.
Adsorption of Ni(II) Ion onto Calcined Eggshells: A Study of Equilibrium Adsorption Isotherm Hans Kristianto; Novitri Daulay; Arenst Andreas Arie
Indonesian Journal of Chemistry Vol 19, No 1 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (19.556 KB) | DOI: 10.22146/ijc.29200

Abstract

Adsorption is one of the most effective and economical method to treat heavy metals in water. In this study, we utilize waste chicken eggshells as biosorbent to adsorb Ni(II). Furthermore we study the effect of eggshell calcination on its adsorption performance. The effect of calcination on the characteristic of eggshell was observed using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy (SEM-EDS). It could be observed that CaCO3 in eggshell was converted into CaO, and from SEM images the calcined eggshell became more porous than the uncalcined one. The effect of various parameters such as initial Ni(II) solution pH and initial Ni(II) concentration was investigated using batch adsorption experiments. The data obtained then fitted to Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms. The best pH for Ni(II) adsorption was found to be 6. From Langmuir and Dubinin-Radushkevich, it was found that calcined eggshells gave 60 times higher maximum adsorption capacity then uncalcined one. This increase was possible due to more porous structure of calcined eggshells. The adsorption process was found to be exothermic and physisorption. This result was confirmed by the decrease of % removal with increase of temperature. Furthermore, Langmuir isotherm was found to be the best model, indicating adsorption of Ni(II) was monolayer adsorption on homogenous surface.
NANO CARBON SYNTHESIS FROM MICROALGAE CHLORELLA VULGARIS AS PRECURSOR OF SOLID PHASE CARBON Alexander William Prijadi; Arenst Andreas Arie; Budi Husodo Bisowarno
JURNAL INTEGRASI PROSES Vol 11, No 2 (2022)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jip.v11i2.15652

Abstract

Nanocarbon is a nanometer-scale substance made entirely of carbon atoms. Generally, the synthesis of nanocarbon is usually conducted using a gas-phase carbon raw material which is toxic. Therefore, the use of solid-phase carbon raw material to synthesize nanocarbon started to develop. In this research, nanocarbon will be synthesized using variations of solid-phase carbon raw material derived from a novel carbon precursor, microalgae Chlorella vulgaris. Nanocarbons produced were analyzed using SEM, XRD, and TEM. SEM analysis did not show the nanocarbon formed. However, this may be due to the nanocarbon being very small. To ensure whether nanocarbon is formed or not, XRD analysis is conducted. XRD analysis shows the possibility of forming carbon nanotubes from the sample with activated carbon as a raw material. There were peaks at diffraction angles of 24–26° and 42–43,5°, which indicated carbon nanotubes. In addition, the dc value of this sample has a value like carbon nanotubes, which is 0.344 nm. In contrast, the other two samples, which used hydrochar and microalgae as raw materials, only indicated activated carbon after the synthesis. The TEM analysis supported by XRD analysis for a sample with activated carbon as a raw material showed the presence of carbon nanotubes. This is indicated by their rope-like morphology, which is not visible in SEM analysis due to their tiny size. At the same time, the other two samples did not show any morphology indicating the presence of nanocarbon. So, it can be concluded that the synthesis of nano carbon has been successfully carried out using activated carbon as raw material and produces nano carbon with the type of carbon nanotubes.
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.
SYNTHESIS OF ACTIVATED CARBONS ORIGINATED FROM ORANGE PEEL BY SUBCRITICAL CO2 ACTIVATION METHOD Arenst Andreas Arie; Emerentina Maerilla Puspaningrum; Henky Muljana
ALCHEMY Jurnal Penelitian Kimia Vol 12, No 1 (2016): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.12.1.944.61-69

Abstract

Low-cost and environmental friendly activated carbons were synthesized from orange peel waste by carbonization followed by activation process using supercritical carbon dioxide. The carbonization process of orange peel waste was conducted in the electrical furnace at temperature of 800 °C for 2 h. Activation process of the impregnated orange peel was carried out in the tubular furnace for 1 h at activation temperature of 140 °C and pressure variation of 80, 125 and 170 bar. Activated carbon with highest surface area of 262.173 m2/g was obtained by co2 pressure of 125 bar. The activated carbons were then utilized as adsorbents for removal of methylene blue (MB) from aqueous solution. The batch adsorption study was carried out by varying the initial concentration of mb solution (2, 4, 6, 8 and 10 ppm). Experimental results showed that the adsorption kinetic of mb fitted the pseudo-second-order rate equation, where as for the adsorption isotherm model followed two models i.e. The dubinin- radushkevich and freundlich model. The adsorption mechanism was found to be governed by the intraparticle and surface diffusion mechanism.
Co-Authors Agung Nugroho Alexander William Prijadi Boas Tua Hotasi Budi Husodo Bisowarno Cahyadi Dwi Putra Christiandi Arifin Daniel Alvin Chaidir Daniel Yonathan Devi Fitriani Kurniawati Emerentina Maerilla Puspaningrum Febe Apecsiana Garry Christianto Solihin Haryadi Wibowo Haryo Satriya Oktaviano Henky Muljana Jessica Atin Kristianto, Hans Muhammad Reza Wirayudha Pratama Nicolas Orlando Novitri Daulay Ratna Frida Susanti Selvya Utama Windy Wilianti Yosep Christian