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Teguh Wirawan, Teguh
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman
Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Public Health Social Sciences

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ADSORPSI METHYLENE BLUE OLEH ARANG AKTIF: MINI REVIEW Mulyana, Mulyana; Wirawan, Teguh; Marliana, Eva
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Methylene blue is a cationic dye molecule which is quite dangerous for the body, one of which can cause irritation of the digestive tract if swallowed, cause cyanosis if inhaled, and cause skin irritation if touched. Adsorption is one of the separation methods most often used in most industries, because the process is easy, and the operating costs are also relatively cheap. Activated charcoal is widely used as an adsorbent material because it has high porosity and surface area and has good absorption capacity for organic and non-organic materials. In this research, a literature study has been carried out on the adsorption of methylene blue with activated charcoal adsorbent from various types of ingredients. There are various factors that can influence the adsorption ability of methylene blue by activated carbon, such as the type of original material, the type of activator used to include HCl, NaCl, KOH, NaOH, H2SO4, and Na2CO3, as well as the temperature range for carbonation between 300-700oC. Adsorption parameters varied, such as pH between 4-9, contact time between 20-240 minutes, and adsorption capacity between 6.90-1614.968 mg/g. Keywords: Methylene blue, Adsorption, Activated charcoal.
ADSORPSI ZAT WARNA METHYLENE BLUE MENGGUNAKAN ADSORBEN KOMPOSIT Fe3O4-ARANG AKTIF KULIT LAI [Durio Kutejensis (Hassk.)Becc.] Rahmawati, Rahmawati; Wirawan, Teguh; Koesnarpadi, Soerja
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Methylene blue is a synthetic dye commonly used in industry. Methylene blue is not very toxic to humans, but can cause skin irritation, eye irritation, and systemic effects including blood changes. This research aims to utilize lai bark activated charcoal composited with Fe3O4 as an adsorbent to adsorb methylene blue dye. Fe3O4-lai skin activated charcoal composite adsorbent was synthesized using the co-precipitation method from FeSO4.7H2O and FeCl3.6H2O then combined with lai skin activated charcoal. The Fe3O4-activated charcoal composite for skin was characterized using FTIR. The results of composite characterization using FTIR show that there is a wave number of 596.00 cm-1 which is the Fe-O group. The research results showed that the optimum conditions for the adsorption of methylene blue dye by the Fe3O4-activated charcoal composite adsorbent for lai skin were 60 minutes, pH 8, concentration 250 mg/L and following the Langmuir isotherm. The maximum adsorption capacity of Fe3O4-lai skin activated charcoal composite was 197.8792 mg/g. Keywords: Adsorption, Methylene Blue Dye, Composite, Lai Leather
Oxidation of Styrene to Benzaldehyde Using Environmentally Friendly Calcium Sulfate Hemihydrate-Supported Titania Catalysts Koesnarpadi, Soerja; Wirawan, Teguh; Nurhadi, Mukhamad; Wirhanuddin, Wirhanuddin; Prananto, Yuniar Ponco; Nazarudin, Nazarudin; Degirmenci, Volkan; Lai, Sin Yuan; Nur, Hadi
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 4 Year 2024 (December 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20224

Abstract

This paper presents the synthesis and characterization of calcium sulfate hemihydrate (CSH)-supported titania (TiO2) catalysts and their application in the environmentally friendly oxidation of styrene to benzaldehyde using hydrogen peroxide (H2O2) as the oxidant. The study explores the catalyst's structure-activity relationship, emphasizing the importance of mesoporous materials for enhanced catalytic performance. The CSH-Titania catalysts were synthesized using fish bone-derived CSH as a support, which aligns with green chemistry principles. Characterization techniques such as Fourier Transform Infra Red (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Brunauer-Emmett-Teller (BET) surface area analysis confirmed the successful impregnation of titania and its catalytic efficiency. The catalysts exhibited high selectivity for benzaldehyde, achieving up to 49.45% conversion of styrene, with benzaldehyde as being the main product. The research highlights that the catalyst’s performance decreased after calcination due to a reduced surface area and pore volume, yet it maintained recyclability across three cycles with minimal  lose  in selectivity loss. Overall, this study introduces a cost-effective and sustainable approach to styrene oxidation, demonstrating the potential for industrial application in producing high-value chemicals with minimal environmental impact. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
PHYTOCHEMICAL TEST AND ANTIBACTERIAL ACTIVITY OF METHANOL EXTRACT OF Melicope lunu-ankenda (Gaertn.) T.G. Hartley STEM AGAINST Salmonella typhi AND Staphylococcus aureus Hermawan, Hermawan; Wirawan, Teguh; Pratiwi, Djihan Ryn
JURNAL ATOMIK Vol 6 No 1 (2021)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Phytochemical test and antibacterial activity of methanol extract of Melicope lunu-ankenda (Gaertn.) T.G. Hartley have been done. The extraction of Melicope lunu-ankenda (Gaertn.) T.G. Hartley stem sample was carried out by the maceration method using methanol as a solvent. An antibacterial activity test was carried out using the agar diffusion method. Phytochemical tests results showed that methanol extract of Melicope lunu-ankenda (Gaertn.) T.G. Hartley stem has secondary metabolites including alkaloids, steroids, triterpenoids, and quinones. The antibacterial activity test results obtained MIC values for Salmonella typhi bacteria of 1.25% and for Staphylococcus aureus bacteria of 0.625%. Methanol extract of Melicope lunu-ankenda (Gaertn.) T.G. Hartley stem has broad-spectrum antibacterial activity.
Pembuatan Arang Aktif Kulit Buah Tarap (Artocarpus odoratissimus B.) dan Komposit Fe3O4-Arang Aktif Kulit Buah Tarap Sebagai Adsorben Logam Kadmium (Cd) Fradita, Windiy Mira; Koesnarpadi, Soerja; Wirawan, Teguh
JURNAL ATOMIK Vol 10 No 1 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i1.1411

Abstract

Tarap (Artocarpus odoratissimus B.) is a species of the genus Artocarpus and belongs to the Moraceae family. In its use, fruit cores, skins, and leaves can become metal adsorbents. This research aims to determine the characteristics and adsorption capacity of tarap fruit skin, which can be an alternative to dealing with cadmium (Cd) metal pollution. Making activated charcoal adsorbent tarap fruit peel was carbonated at a temperature of 450ºC for 1 hour and activated using 2 M HCl, while the Fe3O4-activated charcoal composite tarap fruit peel was made using the coprecipitation method from FeSO4.7H2O and FeCl3.6H2O with a mole ratio of 1:1 and then combined with tarap fruit peel activated charcoal to adsorb cadmium metal using the batch method, which is separated using an external magnet and analyzed using an Atomic Absorption Spectrophotometer. The results of FT-IR characterization on both adsorbents contained C-O and O-H groups and on the Fe3O4-activated charcoal composite of tarap fruit peel, there were Fe-O groups. The XRD difactogram shows that there is a Fe3O4 diffraction pattern with relatively small intensity in the Fe3O4-activated charcoal composite of tarap fruit peel. The results of VSM analysis show that the Fe3O4-activated charcoal composite of tarap fruit peel is paramagnetic. The optimum conditions for the adsorption of cadmium metal on activated charcoal from tarap fruit peel were at pH 7 with a contact time of 60 minutes and on the Fe3O4-activated charcoal composite from tarap fruit peel at pH 6 with a contact time of 45 minutes. The maximum adsorption capacity of activated charcoal from tarap fruit peel is 11.1316 mg/g and for the Fe3O4-activated charcoal composite tarap fruit peel is 22.9510 mg/g.
ELEKTRODEKOLORISASI LIMBAH CAIR INDUSTRI SARUNG TENUN SAMARINDA MENGGUNAKAN ELEKTRODA PbO2/Pb DARI AKI BEKAS Ramadani, Desi Fidyah; Wirawan, Teguh; Widodo, Nanang Tri
JURNAL ATOMIK Vol 10 No 1 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i1.1413

Abstract

Electrodecolorization of liquid waste from the Samarinda woven sarong industry using PbO2/Pb electrode has been conducted. The purpose of this study was to decolorize woven sarong wastewater samples using the electrodecolorization method using lead dioxide (PbO2) as the anode and lead (Pb) as the cathode. Electrodecolorization is carried out by varying working potential, Na2SO4 electrolyte concentration, time and electrode distance. The dye concentration was determined using a UV-Vis spectrophotometer. The research results showed that the optimum conditions for electrodecolorization of woven sarong wastewater samples were using PbO2/Pb electrodes, namely with a working potential of 6 volts, a Na2SO4 electrolyte concentration of 0.25 M, a time of 60 minutes, and a distance of 1 cm. The percentage of decolorization of Samarinda woven sarong wastewater samples using PbO2/Pb electrodes, at maximum conditions was 98,75%.
Adsorpsi Sinarcion Red C8B Menggunakan Arang Aktif Magnetik Berbasis Limbah Ampas Tebu Juliani, Okti; Wirawan, Teguh; Widodo, nanang Tri
JURNAL KIMIA MULAWARMAN Vol 22 No 2 (2025)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v22i1.1066

Abstract

ABSTRAK Penelitian tentang adsorpsi Sinarcion Red C8B menggunakan arang aktif magnetik berbasis limbah ampas tebu telah dilakukan. Adsorben komposit Fe3O4 arang aktif ampas tebu disintesis dari FeCl3.6H2O dan (NH4)2Fe(SO4)2.6H2O dengan perbandingan 2:1 yang dikompositkan dengan arang aktif ampas tebu. Adsorben komposit Fe3O4 arang aktif ampas tebu dikarakterisasi dengan menggunakan instrumen Fourier Transform Infrared (FTIR) dan X-Ray Diffraction (XRD) serta dilakukan uji adsorpsi dengan menentukan waktu kontak, berat optimum, menentukan kapasitas adsorpsi dan menentukan persen adsorpsi dari sampel limbah kain tenun Sarung Samarinda. Hasil karakterisasi spektra FTIR komposit Fe3O4 arang aktif menunjukkan telah terbentuknya komposit dengan ditandai munculnya serapan pada bilangan gelombang 1222,25 cm-1 yaitu adanya gugus C-O dan munculnya serapan khas gugus Fe-O pada bilangan gelombang 573,94 cm-1. Difraktogram XRD komposit Fe3O4 arang aktif menunjukkan pola difraksi arang berbentuk amorf. Adsorpsi zat warna Sinarcion Red C8B pada waktu kontak 45 menit, berat optimum 0,1 g, mengikuti pola isoterm Freundlich dengan kapasitas adsorpsi maksimum sebesar 1,0489 mg/g dan persen adsorpsi dari sampel limbah kain tenun Sarung Samarinda sebesar 21,69%.
Adsorption of Methylene Blue Using Composite Fe3O4-Ihau Fruit Peel Powder (Dimocarpus longan var. malesianus Leenh.) Arisa, Putri; Wirawan, Teguh; Widodo, Nanang Tri
Indonesian Journal of Chemical Research Vol 13 No 2 (2025): Edition for September 2025
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2025.13-put

Abstract

A study has been conducted on the adsorption of methylene blue dye using Fe3O4-ihau fruit peel powder composite as the adsorbent. The Fe3O4-ihau fruit peel powder composite adsorbent was synthesized using the co-precipitation method from FeSO4.7H2O and FeCl3.6H2O in a 3:2 ratio, then composited with ihau fruit peel powder. The resulting Fe3O4-ihau fruit peel powder composite was characterized using Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy (SEM), and X-Ray Diffractometer (XRD). FTIR characterization results of the Fe3O4-ihau fruit peel powder composite showed an absorption peak at a wave number of 586.36 cm-1, corresponding to the Fe-O group. SEM revealed that the Fe3O4-ihau fruit peel powder composite has an uneven surface and smaller pores compared to the ihau fruit peel powder, and XRD showed a diffractogram of the Fe3O4-ihau fruit peel powder composite that closely resembled that of Fe3O4. Methylene blue adsorption by the Fe3O4-ihau fruit peel powder composite adsorbent was optimal at pH 4 with an optimum contact time of 75 minutes, and it had a maximum adsorption capacity of 43.7267 mg/g. The adsorption isotherm followed the Langmuir isotherm, and the adsorption of methylene blue dye using Fe3O4-ihau fruit peel powder composite adsorbent occurs spontaneously, endothermically, and by physisorption.
Gas-Liquid Separator Modified on CV-AAS System for Determination of Total Hg in the Industrial Wastewater Samples Sujito, Sujito; Pasaribu, Subur P; Wirawan, Teguh; Panggabean, Aman Sentosa
Molekul Vol 17 No 3 (2022)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2022.17.3.5039

Abstract

The research about the utilization of modified gas-liquid separators in the determination of Hg ions by using the Cold Vapor Atomic Absorption Spectrophotometer (CV-AAS) method has been done. To optimize the measurement results, several parameters that affect the hydride generator have been studied. Some specified essential parameters are the type and concentration of acid, the level of SnCl2 as a reducing agent, sample volume and the analytical performance such as linearity (r), detection limit (LOD) and quantitation limit (LOQ), repeatability (% RSD), and accuracy have been studied. The results of the research showed the gas-liquid separator modified can be used instead of commercial gas- liquid separators. It was showed by the repeatability value as % RSD < 2/3 CV Horwitz values, the LOD was 0.2530 μg/mL, and the LOQ was 0.8432 μg/mL. The accuracy of this method was good shown by a recovery percentage of 101.6%. Based on the result of this research, the modified of gas-liquid separator can be used for the determination https://www.adenomyosisadviceassociation.org/hysterectomy of Hg ions by using the CV-AAS method with valid results
SINTESIS DAN KARAKTERISASI KOMPOSIT Fe3O4-ARANG AKTIF KULIT BUAH IHAU (Dimocarpus Longan var. malesianus Leenh.) SEBAGAI ADSORBEN METHYLENE BLUE Ananda, Azizah Fithri; Wirawan, Teguh; Widodo, Nanang Tri
Acta Chimica Asiana Vol. 8 No. 2 (2025)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v8i2.253

Abstract

Research has been conducted on the synthesis and characterization of Fe3O4-active charcoal composite of ihau fruit peel (MAACI) as a methylene blue dye adsorbent. This research aimed to produce activated charcoal from ihau fruit peel (AACI) composited with magnetite (Fe3O4). AACI was prepared by carbonating Ihau fruit peel in a furnace at 425C for 1 hour and chemically activated by immersion in an HCl solution for 24 hours. The synthesis of MAACI was carried out using the coprecipitation method with FeCl3 • 6H2O and FeSO4 • 7H2O in a 3:2 ratio, followed by compounding with AACI. The MAACI was characterized by Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The characterization results showed that the FTIR spectrum exhibits an absorption peak at a wavenumber of 586.36 cm-1, indicating the presence of the Fe-O group. SEM analysis revealed that the MMACI has denser pores and a coarser texture compared to activated charcoal. Meanwhile, XRD results showed a diffraction pattern that matches the characterization of magnetite (Fe3O4). The adsorption of methylene blue by MAACI yielded optimum results at a pH of 9 with a contact time of 45 minutes. The maximum adsorption capacity obtained was 8.7014 mg/g, and the adsorption process followed the Langmuir isotherm model. This adsorption takes place spontaneously, is endothermic and occurs physically.
Co-Authors Abdul Aziz Ahmad, Atika Aulia Aman Sentosa Panggabean Ananda, Azizah Fithri Arief, M. Syaiful Arisa, Putri Degirmenci, Volkan Djihan Ryn Pratiwi, Djihan Ryn Ersanto, Tri Edi Eva Marliana, Eva Fatmawati, Ririn Anggraeni Fradita, Windiy Mira Gaanty Pragas Maniam, Gaanty Pragas Hadi Nur Hairani, Rita Hermawan Hermawan Hiyahara, Irfan Ashari Husna Syaima Juliani, Okti Lai, Sin Yuan Menono, Fera Friskaneke Mukhamad Nurhadi, Mukhamad Mulyana Mulyana Nanang Tri Widodo Nazarudin Noor Hindryawati, Noor Nurfarizha, Harisma Oliviani, Nadira Rahmawati, Rahmawati Ramadani, Desi Fidyah Reknosari, Elen Ruga, Ritbey Saibun Sitorus Sam, Risna Fitriani Sari, Riska Alif Kartika Soerja Koesnarpadi Subur P Pasaribu Sujito Sujito Wirhanuddin, Wirhanuddin Yulieta, Afifah Nur Yuniar Ponco Prananto