Article Per Year (5 Year)
p-Index From 2021 - 2026
1.713
P-Index
This Author published in this journals
All Journal Jurnal Bahan Alam Terbarukan Seminar Nasional Teknik Kimia Kejuangan Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Indonesian Journal of Chemistry Jurnal Penelitian dan Pengabdian Kepada Masyarakat UNSIQ Proceedings Series on Physical & Formal Sciences Makara Journal of Technology
Chandra Wahyu Purnomo
Unknown Affiliation
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Other

Published : 14 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 14 Documents
Search

 1   2 
Karakteristik Morfologi dari Formulasi Pupuk NPK Coated dengan Enkapsulasi Starch-PVA-Glycerol Habibi, Wildan; Purnomo, Chandra Wahyu; Perdana, Indra
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

In modern agriculture, the application of NPK fertilizer plays an important role in food security. However, most commercial uncoated fertilizers have low nutrient absorption efficiency with 30-70% nutrient loss, advances to financial losses for farmers and causing environmental issues. Slow-release fertilizer (SRF) is the best solution to decrease loss rate, supplying nutrients sustainably, and reduces potential negative environmental effects. These fertilizers are made by physically encapsulating NPK fertilizer with organic hydrophobic materials (starch-polyvinyl alcohol (PVA)-glycerol). Double layered encapsulation is formulated by in-situ copolymerization of starch with vinyl acetate monomer from PVA in different ratios. Glycerol is added to increase the film compatibility. Scanning Electron Microscope (SEM) followed by Energy Dispersive X-ray (EDX) analysis reveals the morphological characteristic of uncoated and coated NPK samples. The surface micrograph of uncoated NPK exhibits fine spire crystals that are intensely cemented on to the surface with some bigger crystals of potassium chloride. The gaps and pores are also visible. The SEM micrographs of coated NPK depict layering and agglomeration that is a clear indication of the coating. A higher ratio of PVA increases agglomeration on the surface of coated NPK, representing dense and complete coverage with less pores and cavities occurs
Penjerapan Natrium pada Hasil Ekstraksi Silika dari Lumpur Panas Bumi Akmal, Afiffurroyan Aflah; Purnomo, Chandra Wahyu; Ariyanto, Teguh
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

Geothermal sludge contains silica which can be used as plant fertilizer. Extraction of silica from geothermal sludge can be carried out by the extraction method using sodium hydroxide solution to form sodium silicate. This extraction was conducted by varying the extraction time of 10, 20, 30, 40, 50, 60, 70 and 80 minutes; NaOH concentration of 1,5N; and extraction temperature of 80oC. Extracted silica concentration was analyzed using UV-Vis Spectrophotometry. The best extracted silica content was 158673 ppm under 60 minutes of extraction time, 80oC of extraction temperature, and 1.5N of NaOH concentration. The results of this extraction still contain sodium at a concentration and need to be reduced so that it can be used as fertilizer. The process of reducing sodium concentration using the ion exchange method in a batch system. This process uses variations of initial sodium concentration with a resin mass of 20 grams and temperature of 45oC. From the Atomic Adsorption Spectroscopy (AAS) analysis, the adsorption capacity (qe) increases with increasing the initial sodium concentration. Langmuir's equilibrium provide a match to the adsorption equilibrium experimental data.
Physical Separation Bahan Aktif Katoda dari Campuran Hasil CrushingBaterai Lithium-Ion Bekas Fadillah, Farika Asna; Perdana, Indra; Purnomo, Chandra Wahyu
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

The increasing use of electric vehicles in the coming decades makes the recycling of spent li-ion batteries an important topic to develop. Recycling spent li-ion batteries is necessary to extract valuable materials from the battery cathode. Elutriation is one of the separation method to separate the cathode and anode from the blackmass resulting from crushing by utilizing differences in density and terminal velocity. The Elutriation method is attractive to develop because the separation is done by adjusting the fluid velocity and does not use chemicals. In this study, 4 variations of fluid load will be used, namely 24, 27, 30, and 34 mL/min. The blackmass to be elutriated has a size variation between -38 to +53 micrometers. From the results under the elutriator, the cathode mass obtained for fluid load variations of 24, 27, 30, and 34 mL/min are 0.8366, 0.4333, 0.3907, and 0.1349 grams. The highest cathode recovery at a load of 24 mL/min is 97.21% and the cathode fraction is 0.4091. Furthermore, it can increase the cathode composition in the mixture by 48.98% and reduce the anode composition by 18.54%.
Sintesis Graphene Oxide (GO) dari Grafit Limbah Baterai dengan Modifikasi Metode Hummer Atika Putri Karina; Chandra Wahyu Purnomo; Teguh Ariyanto
Proceedings Series on Physical & Formal Sciences Vol. 9 No. 1 (2026): Seminar Nasional Teknik (SENATEK)
Publisher : UM Purwokerto Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/pspfs.v9i1.2164

Abstract

Graphene oxide (GO) is a carbon-based material with great potential for gas adsorption applications due its large surface area and abundant oxygen-containing functional groups. This study aims to synthesize GO from spent lithium-ion battery graphite through an enviromentally friendly modification of the Hummer method. The modification involved varying the intercalation media using hydrogen peroxide (H2O2), sulfuric acid (H2SO4) and their combination to evaluate their effect on the oxidation of potassium permanganate (KMnO4), heating, and post-reduction with H2O2. The structural evolution of graphite and the obtained GO was analyzed using Raman spectroscopy, where the ID/IG ratio was used an indicator of defect density. Result revealed that was battery graphite exhibited a higher degree of structural disorder than commercial graphite, with an increase ID/IG ratio from 0.12 to 0.32. After oxidation the ID/IG ratio increased to 0.33 for GO synthesized with mixed media (H?SO? + H?O?) (GO-mix), 0.94 for GO synthesized with H?SO? (GO-HM), and 1.36 for GO synthesized with H?O? only (GO-PT H2O2). The highest ratio observed in GO-PT H?O? indicates the most effective oxidation and the formation of abundant oxygen functional groups without KMnO? degradation. Therefore, using H?O? as a single intercalation agent offers a simple, efficient, and sustainable approach for producing high-quality graphene oxide from waste battery graphite.
Co-Authors Agus Prasetya Akmal, Afiffurroyan Aflah Alchusnah, Retno Hayati Ariawan, Ilham Arief Budiyanto Astiti, Dian Fitriani Atika Putri Karina Damayanti, Sri Ismiyati Fadillah, Farika Asna Faqih, Nasyiin Fitri Nur Kayati, Fitri Nur Heri Hermanto Hinode, Hirofumi Ika Puspitasari Indra Perdana Khasani Khasani Lenora, Bernice Mustakim, Zainal Putri, Nelliza Saputra, Juli Sarastuti, Dewi Sarto Sunaryo Sunaryo Sunaryo Suwito, Darwito Teguh Ariyanto Teguh Ariyanto Wahyu, Joko Nugroho Wildan Habibi Wiratni Budhijanto Yusmiyati, Yusmiyati