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All Journal Jurnal Teknologi Industri Pertanian Jurnal Rekayasa Proses International Journal of Renewable Energy Development JURNAL KIMIA SAINS DAN APLIKASI Research Report - Engineering Science Jurnal Sains dan Teknologi Jurnal Pendidikan Indonesia Seminar Nasional Teknik Kimia Kejuangan Jurnal Rekayasa Proses International Journal of Applied Sciences and Smart Technologies Metalurgi International Journal of Renewable Energy Development Jurnal Rekayasa Proses
Ratna Frida Susanti
Jurusan Teknik Kimia, Fakultas Teknologi Industri Universitas Katolik Parahyangan, Bandung
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences

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Carbon composite of NiO hydrothermal impregnation from sugarcane bagasse and its electrochemical properties Nasti, Al Nadine De; Siburian, Kyfti Yolanda; Sembiring, Abraham Danofan; Kristianto, Hans; Susanti, Ratna Frida; Oktaviano, Haryo Satriya; Nugroho, Agung
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.88210

Abstract

Sugarcane bagasse (SB) can synthesize activated carbon (AC) through a two-step calcination process at calcination at 400oC and activation at 800oC. NaOH 0.1 M is used to activate the pre-carbonized sample in the activation step. The AC samples undergo hydrothermal impregnation with nickel oxide (NiO) at 110°C. The X-ray diffraction (XRD) pattern and Energy dispersive X-ray spectroscopy (EDX) confirmed the presence of NiO after this process. Scanning Electron Microscope (SEM) indicates the presence of pore structures in the sample morphology. A three-electrode system with 1 M Na2SO4 as an electrolyte was employed to assess the electrochemical properties. The specific capacitance for activated carbon derived from SB stands at 89.53 F/g at 0.05 A/g current density, while after impregnation with NiO, it increases to 250.53 F/g at the same current density. The results demonstrate the possibility of activated carbon from sugarcane bagasse waste composited with NiO as supercapacitor electrodes.
Studi kinetika proses atmospheric pressure acid leaching bijih laterit limonit menggunakan larutan asam nitrat konsentrasi rendah Kevin Cleary Wanta; Felisha Hapsari Tanujaya; Ratna Frida Susanti; Himawan Tri Bayu Murti Petrus; Indra Perdana; Widi Astuti
Jurnal Rekayasa Proses Vol 12 No 2 (2018): Volume 12, Number 2, 2018
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.35644

Abstract

Kinetics study of atmospheric pressure acid leaching (APAL) process is indispensable for extractor design in an industrial scale. So far, the kinetic model used for this process is the shrinking core model. In this study, the shrinking core model was evaluated against experimental data for laterite leaching process using a solution of low concentration nitric acid (0.1 M). Variations in temperature and particle size were carried out at 303–358 K and <75–250 microns. Other operating conditions, such as pulp density, stirring speed, and time were kept at 20% w/v, 200 rpm, and 120 minutes, respectively. The model evaluation results showed that the shrinking core model was not suitable for this process because the process controlling stage is not just one stage only.
Pengaruh derajat keasaman (pH) dalam proses presipitasi hidroksida selektif ion logam dari larutan ekstrak spent catalyst Kevin Cleary Wanta1; Federick Dwi Putra; Ratna Frida Susanti; Gelar Panji Gemilar; Widi Astuti; Shinta Virdhian; Himawan Tri Bayu Murti Petrus
Jurnal Rekayasa Proses Vol 13 No 2 (2019): Volume 13, Number 2, 2019
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.44007

Abstract

Nickel hydroxide [Ni(OH)2] is an important compound in producing rechargeable batteries. The synthesis of Ni(OH)2 can be carried out using a hydroxide precipitation method from a solution containing nickel (II) (Ni2+) ions. In this study, the synthesis of Ni(OH)2 was investigated from the solution of extracted spent catalyst using sulfuric acid (H2SO4) solution. The selective precipitation was conducted using sodium hydroxide (NaOH) solution and the degree of acidity (pH) was varied in the range of 4–14. The operating temperature was kept constant at 30oC. The experimental results showed that the optimum precipitation conditions of Al3+ and Ni2+ ions were obtained at different pH where the optimum pH values were 6 and 10, respectively. Precipitate samples were characterized and the results showed that the purity of Ni(OH)2 in those samples was 13.1%. The XRD results indicated that the structure of precipitate still contains other impurities, such as Na2SO4, Al(OH)3 and those compounds were mutually agglomerate.
Effect of surfactant type on synthesis and characteristics of nanonickel hydroxide Stephen Lim; Ratna Frida Susanti; Gelar Panji Gemilar; Widi Astuti; Himawan Tri Bayu Murti Petrus; Kevin Cleary Wanta
Jurnal Rekayasa Proses Vol 15 No 2 (2021): Volume 15, Number 2, 2021
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.69723

Abstract

Nickel hydroxide has a vital role in various applications, especially as a support material for energy storage materials. Nickel hydroxide can be synthesized through the hydroxide precipitation method. However, the product formed by this method may be large or more than 100 nm because the agglomeration step can occur easily. This present work aims to study the effect of surfactant types in the synthesis and characterization of nickel hydroxide nanoparticle. Nickel sulfate (NiSO4) solution was used as a precursor solution, while 5M sodium hydroxide (NaOH) solution was used as a precipitation agent. The surfactants studied were alkyl benzene sulfonate (ABS), sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and polyvinylpyrrolidone (PVP). The nickel hydroxide synthesis process was carried out at 50 oC for 1 hour. The surfactant concentration used was at the critical micelle concentration (CMC), where the CMC for ABS, SDS, CTAB, and PVP were 0.01; 0.05; 3; and 0.5 %w/v, respectively. The synthesis of nickel hydroxide nanoparticle was carried out successfully precipitated almost 100% of Ni2+ ions. The product characterization that has been carried out shows that ABS surfactant produces the best nickel hydroxide nanoparticle product where the particle size is 3.12–4.47 nm.
SYNTHESIS AND CHARACTERISTIC OF NANOSILICA FROM GEOTHERMAL SLUDGE: EFFECT OF SURFACTANT Adiatama, Aufa Rai; Susanti, Ratna Frida; Astuti, Widi; Petrus, Himawan Tri Bayu Murti; Wanta, Kevin Cleary
Metalurgi Vol 37, No 2 (2022): Metalurgi Vol. 37 No. 2 Agustus 2022
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1467.999 KB) | DOI: 10.14203/metalurgi.v37i2.637

Abstract

In the synthesis of nanoparticles, the phenomenon of agglomeration is an undesirable condition because the particles formed can be larger. The use of surfactants can prevent the occurrence of this phenomenon. In this study, the use of surfactants was studied in the synthesis of nanosilica from geothermal sludge. The method applied in the synthesis of nanosilica is the sol-gel method. A 1 M sodium hydroxide (NaOH) solution was used to prepare the sol phase, while the gel phase was prepared at pH 5 using a 1.5 M hydrochloric acid (HCl) solution. The surfactants used were alkyl benzene sulfonate (ABS), cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS), and polyvinylpyrrolidone (PVP). The surfactant added to the precursor solution was at the critical micelle concentration (CMC), where the CMC values for each surfactant were 0.15, 0.05, 0.50, and 1.00 wt% for ABS, CTAB, SDS, and PVP, respectively. The experimental results showed that the synthesis of nanosilica without surfactant could produce the product with a purity of 98.03%. Even though the purity is already high, the resulting product experiences agglomeration and surfactants were needed to minimize the occurrence of agglomeration in the product. The surfactant that gives the best product quality is PVP, where the particle size is in the range of 2.01–3.65 nm. However, the product produced with this PVP has a low purity, 56.67%. It is because the sodium chloride (NaCl) is trapped in the surfactant template.
Design of Student and Course Learning Outcomes Measurement Kristianto, Hans; Prasetyo, Susiana; Susanti, Ratna Frida; Adithia, Mariskha Tri
Jurnal Pendidikan Indonesia Vol 10 No 1 (2021)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.27 KB) | DOI: 10.23887/jpi-undiksha.v10i1.29061

Abstract

Measurement of the outcomes becomes a vital part in OBE system to ensure the attainment of each outcome. In Indonesia, OBE was adopted in 2015 for higher education level. However, the changes were not accompanied with clear method to measure the outcomes, which became the urgency of this research. In this study, a preliminary method to measure student learning outcomes (SLO) and course learning outcomes (CLO) was presented. The measurement of SLO and CLO attainment was started by SLO mapping to courses, which usually had been done at curriculum design. Based on the mapping, formulation of CLO with a set of direct assessment was planned at the start of each course. After the teaching learning activities, a series of calculation was designed to obtain the attainment of SLO and CLO for each student, course, and whole study program. In the same time the final mark for GPA calculation of each student could also be obtained. The designed method could play an essential part in teaching-learning quality assurance and curriculum continuous improvement, which is aligned with both international and national accreditation criteria and standards. Furthermore, this study could provide insight for other study program in SLO and CLO attainment measurement.
Carbon composite of NiO hydrothermal impregnation from sugarcane bagasse and its electrochemical properties Nasti, Al Nadine De; Siburian, Kyfti Yolanda; Sembiring, Abraham Danofan; Kristianto, Hans; Susanti, Ratna Frida; Oktaviano, Haryo Satriya; Nugroho, Agung
Jurnal Rekayasa Proses Vol 17 No 2 (2023): Volume 17, Number 2, 2023
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.88210

Abstract

Sugarcane bagasse (SB) can synthesize activated carbon (AC) through a two-step calcination process at calcination at 400oC and activation at 800oC. NaOH 0.1 M is used to activate the pre-carbonized sample in the activation step. The AC samples undergo hydrothermal impregnation with nickel oxide (NiO) at 110°C. The X-ray diffraction (XRD) pattern and Energy dispersive X-ray spectroscopy (EDX) confirmed the presence of NiO after this process. Scanning Electron Microscope (SEM) indicates the presence of pore structures in the sample morphology. A three-electrode system with 1 M Na2SO4 as an electrolyte was employed to assess the electrochemical properties. The specific capacitance for activated carbon derived from SB stands at 89.53 F/g at 0.05 A/g current density, while after impregnation with NiO, it increases to 250.53 F/g at the same current density. The results demonstrate the possibility of activated carbon from sugarcane bagasse waste composited with NiO as supercapacitor electrodes.
Pengaruh Konsentrasi NaBH4 dan Penambahan Surfaktan Sodium Dodecyl Sulfate (SDS) dalam Sintesis Nanopartikel Perak sebagai Material Antibakteri Arif Budianto Cuaca; Ratna Frida Susanti; Anastasia Prima Kristijarti; Widi Astuti; Himawan Tri Bayu Murti Petrus; Wanta, Kevin Cleary
Jurnal Rekayasa Proses Vol 18 No 1 (2024): Volume 18, Number 1, 2024
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.12274

Abstract

This study was carried out to study the synthesis of silver nanoparticles in which the concentrations of the reducing agent NaBH4 and SDS surfactant varied. Furthermore, the silver nanoparticles formed were characterized and tested for their antibacterial capabilities to show how varying parameters could influence the properties of silver nanoparticles as an antibacterial material. 0.05 M AgNO3 precursor solution was mixed with NaBH4 solution as a reducing agent in the 0.001–0.015 M concentration range. In addition, surfactant was also added under CMC conditions. The Ag+ ion reduction process took place at room temperature for 5 minutes. Then, the colloidal silver nanoparticle samples were characterized and tested for antibacterial properties. The bacteria used are Escherichia coli and Staphylococcus aureus. This study reduced 98% of Ag+ ions to Ago particles when using surfactants and the highest concentration of NaBH4, whereas the synthesis of silver nanoparticles without surfactants could only reduce 88% of Ag+ ions. Using surfactants also produces particles with a much smaller diameter, around 51 nm. Antimicrobial testing also showed that silver nanoparticles with surfactants could inhibit bacterial growth. Thus, using surfactants and high concentrations of NaBH4 can provide better antimicrobial characteristics and capabilities to these silver nanoparticles.
Synthesis and Characterization of rGO Using a Combination Hummers Method and Hydrothermal Reduction Pardede, Maichel Letare; Jonathan, Nicholas; Irawan, Robin; Nugroho, Agung; Susanti, Ratna Frida
Jurnal Kimia Sains dan Aplikasi Vol 28, No 7 (2025): Volume 28 Issue 7 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.7.396-404

Abstract

Reduced graphene oxide (rGO) was successfully synthesized through a combination of two oxidation methods. The Hummers method was employed to synthesize graphite oxide (GrO), followed by a hydrothermal reduction technique to obtain a more ordered rGO structure. X-ray diffraction (XRD) analysis confirmed the transformation of GrO to rGO, as indicated by an interlayer spacing of 0.35–0.40 nm. This value reflects the crystalline characteristics and multilayer nature of the structure. The calculated crystallite size yielded La = 5.825 nm and Lc = 0.967 nm, suggesting a relatively high degree of crystallinity. Raman spectroscopy revealed an increase in structural disorder after the reduction process, as shown by an ID1/IG ratio of 1.771, which indicates the formation of structural defects due to the removal of oxygen-containing groups. Meanwhile, the IG/ID3 ratio of 1.039 confirms that the carbon atoms in rGO are arranged in a hexagonal graphite lattice. Additionally, the I2D/IG ratio of 0.321 indicates the presence of a multilayer structure. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX) showed that the rGO consists of graphene layers exhibiting folding and wrinkling, likely caused by thermal fluctuations during reduction at 180°C. The success of the reduction process was further supported by the increase in the C/O ratio from 2.42 in GrO to 5.39 in rGO. Electrochemical characterization by cyclic voltammetry (CV) demonstrated that rGO exhibits pseudocapacitive behavior, achieving a specific capacitance of 408.661 F/g at a scan rate of 5 mV/s. Overall, the combined synthesis approach employed in this study successfully produced rGO with favorable morphology and promising electrochemical properties, highlighting its potential for energy storage applications such as supercapacitors.
Kinetika Proses Ekstraksi Katalis Bekas Ni/γ–Al2O3 dengan Pelarut Asam Sulfat: Model Shrinking Core dan Model Lump Bahri, Elsha Pamida; Simanungkalit, Ivanna Crecentia Narulita; Susanti, Ratna Frida; Gemilar, Gelar Panji; Astuti, Widi; Petrus, Himawan Tri Bayu Murti; Wanta, Kevin Cleary
JST (Jurnal Sains dan Teknologi) Vol. 12 No. 3 (2023): Oktober
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jstundiksha.v12i3.46264

Abstract

Tahapan scale–up dari suatu proses kimia, kinetika atau mekanisme dari proses tersebut perlu untuk dipelajari. Hal ini dilakukan untuk meminimalkan kesalahan dalam tahap perancangan suatu alat proses. Studi kali ini bertujuan untuk mengevaluasi model matematika yang dapat menggambarkan fenomena riil dari proses ekstraksi katalis bekas Ni/γ–Al2O3 dengan menggunakan pelarut asam sulfat (H2SO4). Studi ini melibatkan dua tahapan utama, yaitu tahap pengambilan data eksperimen dan tahap simulasi model matematika terhadap data eksperimen. Data untuk studi kinetika diperoleh melalui eksperimen proses ekstraksi dalam kondisi atmosferis di mana temperatur operasi divariasikan pada 30, 60, dan 85oC. Larutan asam sulfat yang digunakan memiliki konsentrasi 1 M, sedangkan ukuran partikel katalis kurang 74 mikron. Proses ekstraksi dilakukan selama 120 menit dengan pengambilan sampel secara berkala. Kandungan nikel pada sampel tersebut dianalisis dengan menggunakan instrumen Atomic Absorption Spectroscopy (AAS).  Hasil eksperimen menunjukkan bahwa pada temperatur 85oC dan waktu ekstraksi 120 menit, nikel yang diperoleh paling banyak dibandingkan kondisi operasi lainnya, yaitu sebesar 16,95%. Studi kinetika terhadap data eksperimen tersebut menunjukkan bahwa model lump merupakan model kinetika terbaik untuk menggambarkan fenomena fisis yang terjadi selama proses ekstraksi ini berlangsung. Model lump memberikan persentase kesalahan rata–rata yang lebih kecil dibandingkan model shrinking core. Hal ini mengindikasikan bahwa tahapan difusi internal dan reaksi kimia merupakan tahapan yang mengendalikan proses ekstraksi ini.
Co-Authors Adiatama, Aufa Rai Agung Nugroho Anastasia Prima Kristijarti Anastasia Prima Kristijarti Arabella Febiola Armani Arabella Febiola Armani Arenst Andreas Arenst Andreas Arie Arif Budianto Cuaca Ashanty Stenny Bahri, Elsha Pamida Dessy Natalia Edward Yonathan Natapraja Elsha Pamida Bahri Federick Dwi Putra Federick Dwi Putra Federick Dwi Putra Felisha Hapsari Tanujaya Felisha Hapsari Tanujaya Felisha Hapsari Tanujaya Garry Christianto Solihin Gelar Panji Gemilar Gelar Panji Gemilar Gelar Panji Gemilar Gelar Panji Gemilar Gemilar, Gelar Panji Haryo Satriya Oktaviano Haryo Satriya Oktaviano Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Ignatius Jeremy Renaldo Indra Perdana Indra Perdana Irawan, Robin Ivanna Crecentia Narulita Simanungkalit Jonathan, Nicholas Kevin Cleary Wanta Kristianto, Hans Mariskha Tri Adithia, Mariskha Tri Muhammad Reza Wirayudha Pratama Nasti, Al Nadine De Nugroho, Agung Pardede, Maichel Letare Rachel Ananda Sartika Garini Sembiring, Abraham Danofan Shinta Virdhian Shinta Virdhian Siburian, Kyfti Yolanda Simanungkalit, Ivanna Crecentia Narulita Stephen Lim Stephen Lim Susiana Prasetyo S Tabita Kristina Mora Ayu Panggabean Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Yohana Fransiska Ferawati