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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Materi Indonesia Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Science and Technology Indonesia INDONESIAN JOURNAL OF APPLIED PHYSICS ALCHEMY Jurnal Penelitian Kimia Jurnal Pengabdian Pada Masyarakat Communications in Science and Technology Molekul: Jurnal Ilmiah Kimia G-Tech : Jurnal Teknologi Terapan Journal of Electrical, Electronic, Information, and Communication Technology (JEEICT) Jurnal Abdi Masyarakat Indonesia Jurnal Abdimas Kartika Wijayakusuma Inovasi Fisika Indonesia (IFI) Molekul: Jurnal Ilmiah Kimia Bulletin of Chemical Reaction Engineering & Catalysis BULETIN FISIKA

Teguh Endah Saraswati

Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Sebelas Maret University Surakarta

Author-ID : 372217

Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry 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 Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health Social Sciences Other

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SYNTHESIS OF MAGNETIC COMPOSITE OF IRON COMPOUNDS/CARBON NANOTUBES IN CHEMICAL VAPOR DEPOSITION Teguh Endah Saraswati; Oktaviana Dewi Indah Prasiwi; Abu Masykur; Miftahul Anwar
Jurnal Sains Materi Indonesia Vol 20, No 3: APRIL 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

The chemical vapor deposition (CVD) synthesis of magnetic carbon nanotubes (mCNT) using carbon dioxide/carbon catalyst has been successfully carried out in various pressures. The temperatures were set at 800° C for 10 minutes reaction time. Nitrogen (N2) gas in 20 Torr was flown in followed by ethanol vapor until the final pressure reached 80 and 100 Torr without added air, and 180 Torr with added air. The formation of mCNT was confirmed by shifted X-ray diffraction (XRD) peak of graphite from 26.53° to 25.53° which were highly considered to the other carbon allotropes with sp2 hybridized carbon atom hybridization structures. The higher pressure with added atmospheric air led to the excessive oxidation which influenced the growth of mCNT. Transmission electron microscopy (TEM) analysis observed mCNT filled by catalyst particles which suggested as magnetic phase induced the magnetic property of mCNT. The best electrical conductivity performance (lower electrical resistance) was owned by mCNT produced in the lower pressure condition with no air added.

PEMBUATAN OZONATED OIL DARI MINYAK GORENG BEKAS MENGGUNAKAN METODE PLASMA DIELECTRIC BARRIER DISCHARGE (DBD) Yuliana Pratiwi; Ellysa Amelia Putri; Muhammad Rifqi Ihsan; Teguh Endah Saraswati
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2019): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 10 2019
Publisher : Prosiding SNST Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (126.341 KB)

Ozonated oil dapat dimanfaatkan sebagai minyak terapi yang dapat mengatasi masalah kulit. Pembuatan ozonated oil dilakukan dengan menggunakan teknologi plasma. Penelitian ini bertujuan untuk mensintesis ozonated oil berasal dari minyak goreng bekas menggunakan plasma Dielectric Barrier Discharge (DBD). Pemakaian minyak goreng bekas sekaligus bertujuan untuk mengurangi limbah minyak goreng bekas dengan mengubahnya menjadi ozonated oil yang memiliki nilai tambah. Reaktor plasma Dielectric Barrier Discharge (DBD) dalam penelitian ini tersusun dari elektroda dalam, elektroda luar dan barrier. Reaktor plasma dihubungkan tegangan AC sebesar 5 kV. Plasma dialirkan dari pompa udara dengan laju alir udara atmosfer sebesar 1 L/menit. Treatment minyak goreng bekas dilakukan selama 2 jam. Hasil treatment minyak goreng bekas diinvestigasi dengan spektrofotometer UV-Vis. Minyak setelah perlakuan plasma memiliki warna yang lebih jernih dibanding dengan minyak sebelum perlakuan. Spektra absorpsi minyak yang dihasilkan menunjukkan pergesaran serapan pada 430 dan 523 nm menjadi berturut-turut 411 dan 477 nm yang diduga sebagai perubahan dari senyawaan oksida minyak goreng menjadi senyawaan minyak terozonasi. Puncak serapan pada 315 dan 357 nm tetap dapat dipertahankan dengan intensitas yang sama yang mengindikasikan bahwa perlakuan plasma tidak merusak struktur utama minyak. Hal ini menyimpulkan bahwa perlakuan dengan plasma DBD mampu menozonasi minyak tanpa mengubah struktur awal minyak.Kata kunci: Dielectric Barrier Discharge (DBD), Minyak Goreng Bekas, Ozonated Oil, Plasma

Purification of Carbon-Based Magnetic Nanoparticles (CMNs) Produced by Submerged Arc Discharge in Liquid Ethanol/Ethylenediamine Oktaviana Dyah Mayasari; Dielsa Eka Kuswari; Witri Wahyu Lestari; Teguh Endah Saraswati
Molekul Vol 16, No 1 (2021)
Publisher : Universitas Jenderal Soedirman

Surface modification of covalently amine-attached carbon-based magnetic nanoparticles (CMNs) can be produced quite simply in submerged arc discharge using the amine-containing liquid medium ethylenediamine (ED), resulting in CMNs-ED. However, after the arc discharge processing, the resulting nanoparticles possibly contain physically absorbed amine-containing molecules from a liquid medium on the particle surface. To remove the non-covalently bound molecules, a purification process is required. In this study, the purification was conducted using polar and non-polar solvents following the synthesis process. The surface property was initially characterized by a dispersion test in water, showing that CMNs-ED purified by water have better dispersion than CMNs produced in ethanol alone, CMNs-ED before purification, and CMNs-ED after purification by immersion in toluene. Before and after purification, the diffraction pattern showed definitive peaks corresponded to the crystal planes of C(002), Fe3C(220), and Fe3O4(311) at 26.51°, 44.65°, and 35.42°, respectively. The amine functional group on the nanoparticles before purification thought to come from decomposed ethylenediamine assigned by the vibration peaks appeared at a wavenumbers ~3400 cm-1 and 1020-1220 cm-1, which corresponds to N-H and C-N, respectively. After purification, the vibration peaks of amine groups were still observable, indicating that the amine groups were still covalently attached to the nanoparticles. Magnetic analysis showed that CMNs before and after purification have superparamagnetic properties, with the magnetic saturation value around 10-17 emu/g. The electron microscope images show that the CMNs-ED before purification have a spherical form with a diameter larger than CMNs-ED after purification.

Photocatalytic Activity of TiO2 Nano Supported on Membrane Cellulose Acetate/Nata De Coco (CA/NDC) in Photodegradation of Methylene Blue Roro Ernia Prawithasari; Ilma Fadilah; Mudjijono Mudjijono; Teguh Endah Saraswati; Dwidjono Hadi Darwanto
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.1.113.90-101

Study of synthesis and effectiveness of membrane catalyst of cellulose acetate/nata de coco-TiO2 nano (CA/NDC-TiO2 nano) in photodegradation of methylene blue in batch system has been investigated. TiO2nanoparticles were synthesized by hydrothermal method followed by calcination at 450oC. Scanning Electron Microscopy (SEM) images indicate nano TiO2 has been successfully synthesized with average particle diameter as 88,63±4,37 nm. X-ray diffraction pattern (XRD) of nano TiO2 shows some characteristic peaks of anatase TiO2 were still existed. Membrane photocatalyst of CA/NDC- nano TiO2 was prepared via phase inversion method by mixing TiO2 nanoparticles with CA casting solution. Thermogravimetric analysis shows three decomposition steps of CA/NDC-nano membrane as well as CA/NDC membrane. Photodegradation of methylene blue was conducted with nano-TiO2 particles and CA/NDC-TiO2 membrane for 50 minutes in batch system. The absorbance changes were measured by spectrophotometer at wavelength of 664.6 nm. The result shows the photodegradation rections tended to follow second order reaction. According to the rate constant value, k, the photocatalytic effectivity using CA-NDC/nano TiO2 membrane and nano TiO2photocatalysts in metilen blue photodegradation, statistically were not significantly different.

EFFECTS OF HEATING TEMPERATURE AND BINDER IN THE PRODUCTION OF CHAR-BASED ELECTRICAL CONDUCTOR Teguh Endah Saraswati; Achmad Bahrudin; Miftahul Anwar
ALCHEMY Jurnal Penelitian Kimia Vol 12, No 2 (2016): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.12.2.708.167-178

Graphite as one alotrof carbon is widely used as an electrode material for a good electrical conductivity properties. Charcoal as a carbon source material was found very abundant in nature. Charcoal has the potential application for electrode material in energy storage such as in a battery or supercapacitor. For this purpose, charcoal amorphous structure needs to be converted into a graphite structure so that it has better electrical conductivity property. This research aims to prepare the electrical conductor material derived from wood charcoal that could potentially be used as an electrode. Preparation was made by mixing charcoal powder with asphalt binder with a weight ratio of 3:1, 4:1, 5:1 and followed by heat treatment under an inert atmosphere at temperature of 600°C, 800°C and 1000°C. Charcoal material which was originally to be an electrical insulator has been successfully converted into an electrical conductor. The achievement of the optimum temperature to produce electrodes with the smallest electrical resistance is then applied to the manufacture of carbon electrodes by heating a mixture of charcoal and fructose binder in a weight ratio of 1:1 (w/w). The results showed electrodes with a mixture of charcoal powder and fructose with heat treatment at 1000°C has the better electrical conductivity among other variations.

Isolasi Mikroselulosa dari Limbah Eceng Gondok (Eichornia crassipes) dengan Metode Bleaching-Alkalinasi Jeesica Hermayanti Pratama; Rizka Lailatul Rohmah; Amalia Amalia; Teguh Endah Saraswati
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Isolasi selulosa dari tanaman Eceng Gondok (Eichornia crassipes) berhasil dilakukan dengan menggunakan metode bleaching diikuti dengan alkalinasi. Metode bleaching dilakukan menggunakan NaOCl dengan pengadukan dan pemanasan suhu rendah yaitu 80 oC selama 4 jam, diikuti dengan metode alkalinasi menggunakan NaOH dengan pemanasan pada suhu rendah yaitu 45 oC selama 3 jam. Penerapan metode bleaching dan alkalinasi ini bertujuan untuk delignifikasi dengan memutuskan rantai polimerik diantara selulosa dengan lignin atau hemiselulosa. Selain itu, proses oksidasi lanjut juga terjadi karena keberadaan HOCl dan OH- sebagai hasil peruraian NaOCl dan NaOH. Setelah pencucian hingga pH netral, hasil isolasi yang didapatkan adalah berupa serbuk putih yang secara fisis berbeda dari material awal sebelum perlakuan. Hasil rendemen berkisar 6 ─ 20% dengan penyusutan massa sebesar 80%. Analisa gugus fungsi hasil isolat dengan spektrometer Fourier Transform Infrared (FTIR) menunjukkan keberadaan serapan dari gugus hidroksil ─OH, ─C─H, =C─H, ─OH dan C=O (gugus karboksilat), C-H dan C─O, dan C─O─C pada cincin piranosa yang menguatkan keberhasilan isolasi selulosa. Berdasarkan observasi morfologi dan struktur dengan menggunakan scanning electron microscope (SEM), selulosa hasil isolasi berbentuk butiran kristal dengan ukuran mikrometer yang secara signifikan berbeda dari penampakan fisis serat awal sebelum perlakuan.Isolation of Cellulose Microfiber from Water Hyacinth (Eichornia crassipes) Waste by Bleaching-Alkalization Method. Cellulose isolation from water hyacinth plants (Eichornia crassipes) was successfully performed using bleaching followed by alkalization methods. The bleaching method was carried out using NaOCl with stirring dan heating at a low temperature of 80 oC for 4 hours. This method was then followed by an alkalization method using NaOH with heating at a low temperature of 45 oC for 3 hours. The application of the bleaching followed by alkalization method aimed to proceed the delignification by breaking the polymeric chain between cellulose dan lignin or hemicellulose. In addition, the process of advanced oxidation also occurred due to the presence of HOCl dan OH- decomposed from NaOCl dan NaOH. The solid was then washed until the pH of the solution was neutral. As results, the white powder solid was obtained which was physically different from the initial material before treatment. The yield obtained was around 6 ─ 20% with a mass shrinkage of 80%. Analysis of the functional groups of the isolates using Fourier Transform Infrared (FTIR) spectrometers showed the presence of the hydroxyl groups ─OH, ─C─H, =C─H, ─OH dan C=O (carboxylic groups), CH dan C ─O, dan C─O─C on the pyranose ring that reinforces the success of the cellulose isolation. Based on morphological dan structural observations under a scanning electron microscope (SEM), the cellulose isolated was in crystalline granules in micrometer size which was significantly different compared to the physical appearance of the initial fiber before treatment.

Hand Sanitizer dari Daun Mangga sebagai Upaya Menekan Penyebaran Pandemi Covid-19 di Wilayah Jebres dan Polokarto Maria Ulfa; Ida Setiarini; Ika Uswatun Hasanah; Kusumandari Kusumandari; Teguh Endah Saraswati
Jurnal Pengabdian Pada Masyarakat Vol 6 No 4 (2021)
Publisher : Universitas Mathla'ul Anwar Banten

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30653/002.202164.900

HAND SANITIZER FROM MANGO LEAVES AS AN EFFORT TO SUPPRESS THE SPREAD OF THE COVID-19 PANDEMIC IN THE JEBRES AND POLOKARTO REGIONS. Covid-19 is an international pandemic that still has many victims. The UNS Campus area is a vulnerable area because apart from being public, there are also many residents who live around the campus which can be a medium for spreading the virus. The implementation of the health protocol, one of which is washing hands with running water or using a hand sanitizer, is one of the preventive measures to prevent the spread of the virus. Synthetic hand sanitizers have a lot of impact, especially for people who are sensitive to chemicals such as alcohol or synthetic disinfectants. On the other hand, the use of hand sanitizers has an important position to suppress the spread of the virus because it has the power to deactivate proteins from the Covid-19 spike section. Therefore, a breakthrough is needed to make natural hand sanitizers that are cheaper and have long-term sustainability. One of the natural ingredients that have a high antibacterial content is mango leaves. Various studies have stated that the tannin content of mango leaves is around 1.0 mg/g capable of deactivating bacteria and viruses. Unfortunately, so far, mango leaves are not used much except as fertilizer and more is wasted as garbage. In addition, the long pandemic period has caused the community not to have large reserves of hand sanitizers for their daily needs. Therefore, in this community service, training on the manufacture of hand sanitizers was carried out in the area around the UNS campus to provide skills to the community in procuring hand sanitizers independently from the plants around them as well as providing stock of natural hand sanitizers for people who are sensitive to chemicals.

Surface-enhanced Raman Scattering (SERS) Substrate of Colloidal Ag Nanoparticles Prepared by Laser Ablation for Ascorbic Acid Detection Teguh Endah Saraswati; Yudha Pratama Putra; Mohammad Rifqi Ihsan; Isnaeni Isnaeni; Yuliati Herbani
Molekul Vol 13, No 1 (2018)
Publisher : Universitas Jenderal Soedirman

Ag nanoparticles were synthesized by laser ablation using an Ag plate in distilled water. This method was performed using a laser with a wavelength of 532 nm and energy of 30 mJ for 60 min. Ag nanoparticles successfully formed, confirmed by the selected area electron diffraction (SAED) which revealed four principal crystal planes of (111), (200), (220) and (311). The size distribution of Ag nanoparticles ranged from 5 to 40 nm, as estimated from electron imaging observed by transmission electron microscope (TEM). Ascorbic acid was used as the analyte to test the characteristics of surface-enhanced Raman scattering (SERS) of colloidal Ag nanoparticles. The concentration of ascorbic acid (1.0, 0.5 and 0.25 wt%) and incubation time (0 and 6 h) were varied to determine the limit of detection and the effect of incubation time. The Raman scattering spectroscopy results showed that the colloidal Ag nanoparticle substrate improved the signals for detection of ascorbic acid.

The Chemical Characteristics of Iron Oxide/Carbon Synthesized by the Arc Discharge Method in Liquid Media with the Addition of Ammonia Indah Retnosari; Ikrima Nur Hayati; Amalia Amalia; Sri Hastuti; Teguh Endah Saraswati
Jurnal Kimia Sains dan Aplikasi Vol 21, No 4 (2018): volume 21 Issue 4 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

The chemical characteristics of composite material of iron oxide with carbon synthesized by arc discharge method in liquid medium have been identified. The liquid medium used in the method was ethanol with ammonia addition. The chemical characteristics of the resulting product were studied by Fourier transform infrared spectroscopy (FTIR) and energy dispersive X-ray (EDX). The morphology of the material was studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The observed materials have a spherical and orderly structure. The FTIR spectra profile shows the peaks of N-H and C-N. The amino groups coming from ammonia as a liquid medium during arc discharge were supposed to have been covalently attached to carbon materials composited with iron oxide. The elemental analysis of EDX confirms the presence of nitrogen elements that were not found on the materials synthesized in arc discharge without ammonia addition.

Understanding Pore Surface Modification of Sucrose-Modified Iron Oxide/Silica Mesoporous Composite for Degradation of Methylene Blue Yuvita Eka Pertiwi; Maria Ulfa; Teguh Endah Saraswati; Didik Prasetyoko; Wega Trisunaryanti
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 3 Year 2021 (September 2021)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.3.10619.459-471

Santa Barbara Amorphous (SBA-15) containing iron oxide with a sucrose-modified in a heterogeneous reaction for degradation methylene blue (MB) successful synthesized used hydrothermal, ultrasonication, and wet impregnation method. SBA-15 is mesoporous silica that can easily serve as external and internal surfaces making it suitable for a wide range of applications. The structure and morphology of materials were characterized using Surface Area Analyzer (SAA), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Transmission Electron Microscopy (TEM). Iron oxide impregnated as a maghemite phase has an average size of 12 nm and well distributed on the SBA-15. After modified with sucrose the materials remaining stable, which has a two-dimensional hexagonal (p6mm) structure, high specific surface area, and large pore volume (up to 1.82 cm3.g−1). The degradation of MB was evaluated under visible light irradiation using UV-Vis spectroscopy. Catalytic activity showed efficiencies of 52.9; 70.2; and 21.1% for SBA-15, Fe2O3/SBA-15, and sucrose-modified Fe2O3/SBA-15 respectively. Sucrose-modified Fe2O3/SBA-15 has the lowest efficiency, which probably occurs due to the presence of pore-blocking and the formation of micropores on the external pore. The modification with sucrose has the advantage of producing a high surface area even though there is a catalytic center due to partial decomposition which causes a decrease in the efficiency of degradation of MB. All materials provide a high micro surface area so that they can be further adapted and can be widely applied to many potential applications as both catalyst support and an adsorbent. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Co-Authors Abdul Basith Abdurrahman, Ahmad Faruq Abu Masykur Abu Masykur Achmad Bahrudin Agus Ramelan Ahmad Faruq Abdurrahman Ahmad Qusnudin Akihisa Ogino Alifia Desy Alifia Desy, Alifia Amalia Amalia Amalia Amalia Aprilia, Ayu Ardian Aji Ardian Aji, Ardian Ari Handono Ramelan Asy Syifa Labibah Athaya Cantia Putri Atmanto Heru Wibowo Candra Purnawan Carissa Hertiningtyas Carissa Hertiningtyas, Carissa Cynthia Linaya Radiman Dana - Praseptiangga Davit Dhruv Deana Wahyunigrum Dendy, Dendy Dian Maruto Widjonarko Dian Maruto Widjonarko Didik Prasetyoko Dielsa Eka Kuswari Dini Deviana Saputri Djuminah Djuminah Dwi Teguh Rahardjo Dwidjono Hadi Darwanto Edi Pramono Edi Pramono Edi Pramono Edi Pramono Ellysa Amelia Putri Fajar Rakhman Wibowo Faradilla, Radianita Feri Adrianto Fitriana, Dina Ganjar Fadilah Ganjar Fadillah Ganjar Fadillah, Ganjar Hamzah Fansuri Husna Syaima Ida Setiarini Ika Uswatun Hasanah Ikrima Nur Hayati Ilma Fadilah Indah Retnosari Irfani, Hasna Haifa Irwan Iftadi Isa Anshori Isna Nurmilatul Azizah Isnaeni Isnaeni Isya Fitri Andhika, Isya Fitri Isya Fitria Andhika Jeesica Hermayanti Pratama Kemala, Yusnadia Kusumandari Kusumandari Kusumandari Kusumandari Kusumandari, Kusumandari Kusumawardani - - Lestar, Witri Wahyu Lestari, Witri Wahyu Maria Ulfa Masaaki Nagatsu Melina, Dika Caesar Miftahul Anwar Miftahul Anwar Miftahul Anwar Mohammad Rifqi Ihsan Mudjijono Mudjijono Muhammad Rifqi Ihsan Mukti, Rino Rakhmata Murni - Ramli Nadia Octaviani Faiq Salsabila Naufal, Widyan Muhammad Nestri Handayani, Nestri Nisaul Hasanah Abdul Rosyad Nor Shalina Saputri Nugroho, Roshid Adi Nuzula, Rifania Aura Oktaviana Dewi Indah Prasiwi Oktaviana Dyah Mayasari Ozi Adi Saputra Patiha Patiha Patiha Patiha, Patiha Pramudita Putri Kusuma Pramudita Putri Kusuma Pramudita Putri Kusuma, Pramudita Putri Pratama, Jeesica Hermayanti Puspitasari, Melani Puji Rahayu Rahayu Rahmawati Rahmawati Rizka Lailatul Rohmah Rizqi Apriliyani Roro Ernia Prawithasari Rosid Eka Mustofa Saputri, Dini Deviana Sari, Fitri Nela Sayekti Wahyuningsih Sayekti Wahyuningsih Sayekti Wahyuningsih Sayekti Wahyuningsih Sentot Budi Rahardjo Sentot Budi Rahardjo Sentot Budi Rahardjo Sentot Budi Raharjo Sri Hastuti Sri Hastuti Sri Murni Suciati - - Suharbiansah, Rujito S. R. Sulistyo - Saputro Ulfa, Maria Venny, Venny Wega Trisunaryanti Widyan Muhammad Naufal Wijang Wisnu Raharjo Wijang Wisnu Raharjo Witri Wahyu Lestari Wulandari, Resa Yudha Pratama Putra Yudi - Rinarto Yuliana Pratiwi Yulianto Adi Nugroho Yuliati Herbani Yuvita Eka Pertiwi Zahar, Intan Zetadini, Reza

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