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All Journal Jurnal Rekayasa Proses International Journal of Renewable Energy Development Jurnal Sains dan Teknologi Journal of Engineering and Technological Sciences SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Jurnal Rekayasa Proses INSIST (International Series on Interdisciplinary Research) Journal of Appropriate Technology for Community Services International Journal of Applied Sciences and Smart Technologies Abdimas Galuh: Jurnal Pengabdian Kepada Masyarakat Reswara: Jurnal Pengabdian Kepada Masyarakat Metalurgi International Journal of Renewable Energy Development Jurnal Rekayasa Proses
Kevin Cleary Wanta
Department Of Chemical Engineering, Parahyangan Catholic University
Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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Uji validitas model shrinking core terhadap pengaruh konsentrasi asam sitrat dalam proses leaching nikel laterit Kevin Cleary Wanta; Himawan T. B. M. Petrus; Indra Perdana; Widi Astuti
Jurnal Rekayasa Proses Vol 11 No 1 (2017): Volume 11, Number 1, 2017
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.23321

Abstract

Atmospheric pressure acid leaching process is one of nickel laterite processing which has a big potential to be applied in industry. The leaching process is influenced by several factors and one of them is concentration of acid as leachant. The purpose of this present study is to learn the effect of concentration of citric acid on the use of shrinking core kinetic model. The process was done by varying citric acid concentration at 0.1, 1, and 2 M. The other operation conditions, such as particle size, solid-liquid ratio, temperature, stirring speed, and leaching process were kept constant at 125-150 μm, 0,2 sample mass/volume of acid solution, 85 oC, 200 rpm, and 120 minutes, respectively. The experimental results showed that the higher concentration of citric acid was used, the higher the percentage recovery of nickel was obtained. In addition, the validity test of shrinking core model indicated a positive impact to describe physical phenomenon of leaching process.
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.
Nickel recovery from nickel-containing spent catalyst using atmospheric leaching and oxalate precipitation Widi Astuti; Yuniati, Mutia Dewi; Yuda, Aulia Pertiwi Tri; Sumardi, Slamet; Dewi, Jilda Sofiana; Wanta, Kevin Cleary; Petrus, Himawan Tri Bayu Murti
Jurnal Rekayasa Proses Vol 19 No 2 (2025): Volume 19, Number 2, 2025
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.17589

Abstract

A study has been done to investigate and optimize the recovery of nickel from nickel-containing spent catalyst through sulfuric acid (1 - 2 mol/L) atmospheric leaching in different operation conditions. From the leaching experiments, it was possible to extract 77.95% nickel under the conditions of 2 mol/L H2SO4, reaction time of 5 h, 5% pulp density, and temperature of 80°C. In the next step Ni was selectively precipitated from a sulfuric acid-leached solution using 1 mol/L oxalic acid. The nickel content in the product was 97.29% Ni. Based on the study, sulfuric acid was found to be a suitable leaching agent to extract Ni from the nickel-containing spent catalyst. The study also indicated the effective extraction and recovery of nickel which was well supported by characterization studies using XRD technique.
Pengaruh kalsinasi terhadap karakteristik mesoporous nanosilica (MSN) dari sludge geothermal dan performanya dalam sistem drug loading kurkumin Angelia, Annasthasya Milleni; Ramadhany, Putri; Kristijarti, Anastasia Prima; Astuti, Widi; Petrus, Himawan Tri Bayu Murti; Wanta, Kevin Cleary
Jurnal Rekayasa Proses Vol 19 No 2 (2025): Volume 19, Number 2, 2025
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.20154

Abstract

This study was conducted to study the effect of calcination on the characteristics of mesoporous nanosilica (MSN) from sludge geothermal waste and its performance in drug loading curcumin. The preparation of MSN was carried out using the sol-gel method using polyvinylpyrrolidone (PVP) surfactant. The removal of surfactants from MSN was processed using the calcination method, where the muffle furnace was adjusted at a temperature of 600oC for 7 hours. The formed MSN samples were then characterized using XRF, XRD, FTIR, and BET instruments. Meanwhile, the adsorption capacity of MSN to curcumin before and after calcination was measured using a 600 ppm curcumin solution. This drug loading process lasted for 6 hours at room temperature. The study's results showed that MSN's composition and crystallinity structure did not change significantly due to the calcination process. However, the functional groups of MSN changed after calcination. The pore size of MSN after calcination also decreased from 4.31 (before calcination) to 4.02 nm. This change in MSN characteristics also affects the performance of curcumin drug loading. This can be seen based on the efficiency of curcumin adsorption, where calcined MSN can adsorb curcumin by 32.92%, while for uncalcined MSN, the adsorption efficiency is 25.64%. Based on the results of this study, the calcination process has a positive effect on the drug loading ability of MSNs.
Analisis kelayakan finansial dan non finansial untuk pendirian pabrik pakan ikan berbasis maggot Wanta, Kevin Cleary; Julianto, Shelvia; Fynn, Vincentius Felix; Miryanti, Y.I.P. Arry; Kumalaputri, Angela Justina; Santoso, Herry; Tjuaja, Rudy; Witono, Judy Retti B.
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.80087

Abstract

Sektor perikanan di Indonesia tergolong sebagai sektor yang sangat besar, baik dalam hal produksi maupun konsumsinya. Kondisi ini menyebabkan kegiatan budidaya ikan juga akan meningkat seiring dengan kebutuhannya. Salah satu masalah yang dihadapi dalam kegiatan tersebut adalah masalah pakan ikan yang mahal. Untuk itu, pendirian pabrik pakan ikan yang murah dengan produk yang memenuhi standar nutrisi merupakan peluang besar. Studi ini mempelajari tentang evaluasi ekonomi terhadap kelayakan finansial dan non finansial dari pabrik pakan ikan berbasis maggot. Analisis kelayakan finansial yang telah dilakukan menunjukkan bahwa nilai ROI, PBP, NPV, IRR, dan BEP sebesar 20,84%, 5,48 tahun, Rp 307.103.117, 15,36%, dan 32,11%, secara berurutan. Berdasarkan hasil perhitungan tersebut, seluruh parameter kelayakan finansial menunjukkan bahwa pabrik pakan ikan berbasis maggot ini layak untuk didirikan. Tidak hanya itu, pendirian pabrik tersebut juga memberikan pengaruh positif secara non finansial. Aspek lingkungan, teknikal, sosial-ekonomi, dan pasar mendukung kelayakan pendirian pabrik ini. Lebih jauh, pabrik pakan ikan ini juga mendukung usaha untuk mengatasi permasalahan sampah organik. Kegiatan budidaya maggot dengan menggunakan sampah organik ini akan tumbuh karena maggot yang dihasilkan dapat digunakan sebagai bahan baku utama untuk produksi pakan ikan.
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.
Simulation of Cement Mill to Predict and Mitigate the Over-Heat Phenomenon: an Approach to Optimize the Energy Consumption in Cement Industry Petrus, Himawan Tri Bayu Murti; Kristanto, Jonas; Wanta, Kevin Cleary; Prasetya, Agus
International Series on Interdisciplinary Science and Technology Vol. 4 No. 2 (2019)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

being one of the most energy-intensive industries, cement industry requires to evaluate the energy efficiency of their operating units, one of them is cement mill. Functioning as a mixing unit of several materials, i.e., clinker, limestone, gypsum, and trass with their initial heat and propensity of heat generation during milling, over-heat in the cement mill occurs frequently. It should be avoided in order to establish efficiency. Therefore, a mathematical model was generated in this study to predict and to mitigate this overheat phenomenon. This cement mill mathematical model has been generated using mass and energy balances. The output of the model is temperature profile versus residence time with targeted water content of the product that the optimum residence time can be calculated. Based on the temperature profile with a targeted water content of the product, it can be concluded that the optimum operating condition of the cement mill lies in the range of 5 to 30 seconds of materials residence time in the cement mill
Co-Authors Achmad Noerkhaerin Putra Adiatama, Aufa Rai Agus Prasetya Agus Prasetya Anastasia Prima Kristijarti Anastasia Prima Kristijarti Angela Justina Kumalaputri Angelia, Annasthasya Milleni Arif Budianto Cuaca Arry Miryanti Bahri, Elsha Pamida Ceicalia Tesavrita Cherish Rikardo Dewi, Jilda Sofiana Dwiki Eka Putra Edward Yonathan Natapraja Elsha Pamida Bahri Federick Dwi Putra Federick Dwi Putra Federick Dwi Putra Felisha Hapsari Tanujaya Felisha Hapsari Tanujaya Felisha Hapsari Tanujaya Fynn, Vincentius Felix Gelar Panji Gemilar Gelar Panji Gemilar Gelar Panji Gemilar Gelar Panji Gemilar Gemilar, Gelar Panji Giovanni Angelina Herry Santoso Himawan T. B. M. Petrus 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 Indra Perdana Indra Perdana Indra Perdana Indra Perdana Ivanna Crecentia Narulita Simanungkalit Jonas Kristanto Judy Retti Witono Julianto, Shelvia Kristanto, Jonas Loren Pratiwi Ramadhany, Putri Ratna Frida Susanti Shinta Virdhian Shinta Virdhian Simanungkalit, Ivanna Crecentia Narulita Slamet Sumardi, Slamet Stephen Lim Stephen Lim Tabita Kristina Mora Ayu Panggabean Tjuaja, Rudy Vincent Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Y.I.P. Arry Miryanti Yansen Hartanto Yeremias Juma Yuda, Aulia Pertiwi Tri Yuniati, Mutia Dewi