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All Journal Jurnal Riset Kimia Indonesian Journal of Chemical Science ALCHEMY Jurnal Penelitian Kimia BERNAS: Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian Masyarakat Indonesia Molekul: Jurnal Ilmiah Kimia International Journal of Renewable Energy Development Jurnal Rekayasa Proses
Yuniawan Hidayat
Universitas Sebelas Maret
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Neuroscience Nursing Public Health Social Sciences Veterinary Other

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KAJIAN KESAHIHAN PERSAMAAN ESPENSON (1995) UNTUK REAKSI ENZIMATIS DAN YANG MIRIP Patiha, Patiha; Mudjijono, Mudjijono; Hidayat, Yuniawan; Pramono, Edy
Indonesian Journal of Chemical Science Vol 3 No 2 (2014)
Publisher : Indonesian Journal of Chemical Science

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Abstract

Telah dilakukan kajian tentang kesahihan persamaan Espenson (1995). Pertama secara teoritis atas paradigma yang digunakan dan kemudian dari hasilpenerapannya pada penentuan tetapan Michaelis-Menten dari reaksi brominasi aseton.  Dikatakan sahih jika, secara teoritis konsisten dengan konsep dasar kinetika kimia dan reaksi enzimatisdan memberikan harga tetapan Michaelis-Menten yang pasti. Ditemukan bahwa persamaan tersebut tidak/kurang sahih.
STUDI KINETIKA REAKSI HIDROGEN PEROKSIDA DENGAN IODIDA PADA SUASANA ASAM R. Hakim, Arif; Patiha, Patiha; Hidayat, Yuniawan
Indonesian Journal of Chemical Science Vol 3 No 2 (2014)
Publisher : Indonesian Journal of Chemical Science

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Abstract

Studi kinetika reaksi hidrogen peroksida dengan iodida pada suasana asam telah dilakukan. Tujuan penelitian ini adalah membuktikan apakah hukum laju reaksi merupakan penjumlahan, pecahan ataugabungan keduanya. Desain percobaan yang digunakanadalah metode isolasi dengan H+ dan I- dibuat berlebih terhadap H2O2.Hasil percobaan variasi konsentrasi H+menunjukan reaksi dapat memenuhi hukum laju dalam bentuk penjumlahan. Pada percobaan variasi konsentrasi H2O2, H2O2 teramati dapat berorder 0 atau 1 bergantung pada konsentrasinya sesuai dengan yang diperkirakan dari hukum laju pecahannya. Berdasarkan hasil percobaan, reaksi disimpulkan memiliki hukum laju gabungan keduanya yang lebih lanjut terbukti berdasarkan nilai konstanta laju perhitungan.
HDO Reaction of THF Using Pt/γ-Al2O3 Catalyst Enriched by Alumina: Effect of Temperature to Product Distribution, Rate of Reaction and Deactivation of Catalyst Hidayat, Yuniawan; Nurcahyo, Idul Fitri; Sofiana, Ana; Saputro, Arifin Dwi
ALCHEMY Jurnal Penelitian Kimia Vol 10, No 1 (2014): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.10.1.5.94-104

Abstract

Effect of temperature variation to product distribution, rate and deactivation of catalyst of tetrahydrifuran hydrodeoxygenation have been conducted using Pt/gAl2O3 with aluminum enrichmen. Reaction was conducted by flow system. Product of reaction were analyzed as propane (C3) and buthene derivate (C4). At 350ºC, reaction product and rate constant were optimum. At higher temperature, product distribution was shift from C4 to C3. Lowering pore size catalyst, surface area and acidity of catalyst were responsible to catalyst deactivation. Deactivation process was follow exponential regression.
Effect Of Concentration Metal Precursor Co And Mo On Character Of CoMo / USY Catalyst Nugrahaningtyas, Khoirina Dwi; Hidayat, Yuniawan; Saputri, Tiara Diah
ALCHEMY Jurnal Penelitian Kimia Vol 10, No 1 (2014): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.10.1.9.40-48

Abstract

The preparation and characterization of bimetallic catalysts using impregnation method with a variation of concentration of precursor sequence Co and Mo metal  obtained  catalyst K 1 [Co (0.018 M) - Mo (0.037 M)/USY]. K 2 [Co (0.026 M) - Mo (0.055 M)/USY], K 3 [Co (0.035 M) - Mo (0.074 M)/USY], K 4 [Co (0.05 M) - Mo (0.11 M )/USY] and K 5 [Co (0.107 M) - Mo (0.22 M)/USY].Character of the catalyst in terms  of crystallinity was analyzed by XRD. The result shows that there is no cristalinity damage of USY after impregnation but the amorphous cristalin structure was obtained.  Amount of metal content was analyzed by XRF and the catalyst morphology by SEM-EDS. The result shows that the higher the concentration of Co and Mo so that find the higher content of metal in catalyst of the prepared catalyst increase. K 4 shows the best characteristic of catalysts prepared in this research. Analysis of K 4 is proving that Co and Mo are presented in catalyst
Activated Carbon Addition Methods on the Pre-impregnation Process of Co-Mo in Y-Zeolite Ultra Stable: A Properties Exploration and Enhancement of Metals Loaded Hidayat, Yuniawan; Nugrahaningtyas, Khoirina Dwi; Hendrastuti, Priska Julia
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.384

Abstract

The amount of loaded Co-Mo metal on the Y-Zeolite Ultra Stable (USY) was increased by the addition of activated carbon in the pre-impregnation process. USY modification was done by adding activated carbon to USY as much as 10 wt%. The process of adding activated carbon is carried out by three methods, i.e., grinding with sucrose binder (ACU1), without sucrose (ACU2), and conducting by ball milling (ACU3). Wet impregnation method was employed to disperse the Co and Mo, sequentially. Composites were characterized using Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), and surface area analyzer (SAA). Metal dispersions were observed by X-ray fluorescence (XRF). The FTIR suggests an interaction between USY and activated car-bon, while the XRD result indicated the none structural transformation of USY zeolite. The SAA analysis showed an increased total pore radius with the activated carbon addition. The XRF confirmed the increasing of total metals dispersion of 6.25% (ACU1); 5.48%(ACU2); 5.18% (ACU3); compare to USY origin with 3.28% metals loaded.
The Role of The Ni/HZSM-5 Ratio on The Anisole Hydrodeoxygenation Reaction Nugrahaningtyas, Khoirina Dwi; Nurcahyo, I F; Hidayat, Yuniawan; Rahmawati, Fitria; Fadlulloh, Zaki; Heraldy, Eddy; Qurrotul'aini, Nisriina 'Abidah
Molekul Vol 19 No 2 (2024)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2024.19.2.11105

Abstract

ABSTRACT. Bio-oil is a renewable energy source with high oxygen levels, and anisole is a chemical widely employed in research to represent it. Catalytic hydrodeoxygenation (HDO) reduces the oxygen content. A catalyst known as nickel-modified HZSM-5 has shown promising results for HDO. Meanwhile, catalyst efficiency depends on the Ni/HZSM-5 ratio. So, this study aims to determine how the Ni/HZSM-5 ratio influences the catalyst's properties, activity, and selectivity in anisole HDO. The Ni/HZSM-5 catalyst was made using the wet impregnation method with various ratios of Ni/HZSM-5. The catalysts were analyzed for their morphology using scanning electron microscopy-energy-dispersive X-ray (SEM-EDX). The diffraction patterns were studied using X-ray diffraction (XRD). Surface area and porosity were determined through gas sorption analysis (GSA). Then, the acidity strength was evaluated via temperature-programmed ammonia desorption (NH3-TPD). The characterization results show Ni was successfully impregnated and distributed evenly in HZSM-5 without changing the primary structure. Adding Ni metal to HZSM-5 increases the surface area of the catalyst but reduces its acid strength. The catalytic performance of the catalysts was then evaluated in a flow reactor at 400 °C, using 15 mL/min H2 gas. The liquid products of the reaction were analyzed using gas chromatography-mass spectroscopy (GC-MS). The results of the catalytic performance show that Ni4.5/HZSM-5 has the highest catalytic activity in anisole conversion. At the same time, Ni6.4/HZSM-5 shows the highest selectivity towards benzene-toluene-xylene (BTX). Keywords: Hydrodeoxygenation, nickel, anisole, heterogeneous catalyst, acidity.
N/S-doped carbon electrode derived from paper waste as a sustainable electric double-layer capacitor Rahmawati, Fitria; Aini, Nur; Ridwan, Qanita; Paramartha, I Gusti Ayu Filia; Putri, Denis Octareta Amelia; Saputri, Dini Deviana; Nugrahaningtyas, Khoirina Dwi; Heraldy, Eddy; Hidayat, Yuniawan; Nurcahyo, I. F.; Anggraningrum, Ivandini Tribidasari
International Journal of Renewable Energy Development Vol 14, No 3 (2025): May 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60846

Abstract

This research aims to produce N/S-doped Carbon Electrode derived from paper waste (NSCEp) for Electric Double-Layer Capacitor (EDLC). The paper waste holds potential as raw material for carbon production because of its high cellulose content, abundance of availability, and low price. To enhance the electrical performance of the carbon, an activation step was conducted, followed by double doping with nitrogen and sulfur using thiourea. The NSCEp result was analysed to examine its specific diffraction peaks, crystallinity, morphology, and elemental contents. The NSCEp powder was then mixed with dispersant to produce a homogeneous slurry for the electrode film. The EDLC was assembled in a sandwich-like structure, with sodium hydroxide (NaOH) solution impregnated in a separator between the carbon film electrodes. The EDLC assembly was conducted under an argon atmosphere in a CR2032 coin cell. The results found that the NSCEp provides a high electrical conductivity of 1.21 x 102 S/cm. The prepared EDLC achieved the specific capacitance value of 39.555 F/g as determined by cyclic voltammetry (CV) analysis. Furthermore, the EDLC demonstrates high initial charge-discharge capacities of 300.56 mAh/g and 248.88 mAh/g, respectively, at a current of 0.015 A/g. The capacity remains stable for up to 300 charge-discharge cycles.
Optimalisasi Pengelolaan Sampah Rumah Tangga Menjadi Kompos Dan Produk Kreatif Di Bank Sampah Permata, Desa Kembaran Siswandari, Siswandari; Hidayat, Yuniawan; Sutrisno, Joko
BERNAS: Jurnal Pengabdian Kepada Masyarakat Vol. 6 No. 2 (2025)
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/jb.v6i2.12907

Abstract

Pengelolaan sampah rumah tangga perlu dilakukan secara komprehensif dan terpadu dari hulu ke hilir agar memberikan manfaat secara ekonomi, sehat bagi masyarakat dan aman bagi lingkungan serta dapat mengubah perilaku masyarakat. Seperti yang dilakukan oleh Bank Sampah Permata Desa Kembaran. Akan tetapi dalam pelaksanaannya belum maksimal. Peran bank sampah permata saat ini baru sebatas pengepul sampah non-organik yang masih bisa dijual kembali. Bank Sampah Permata pada dasarnya memiliki potensi dan peluang untuk terus berjalan. Hal ini disebabkan karena dukungan pemerintah setempat cukup besar pada bank sampah ini. Akan tetapi kondisi tersebut belum diimbangi dengan kesadaran dan pengetahuan warga setempat sebagai anggota bank sampah permata dalam menanggulangi permasalahan sampah. Khususnya dalam pemahaman pentingnya pemilahan sampah rumah tangga (sampah organik dan non-organik). Oleh karenanya kegiatan optimalisasi pengelolaan sampah rumah tangga di Desa Kembaran dilakukan melalui edukasi tentang pemilahan sampah, pelatihan ecobrick, pendampingan pengelolaan sampah organik dan pelatihan kewiraushaan agar diperoleh hasil yang maksimal
Studi awal kestabilan struktur katalis logam transisi periode pertama berbasis HZSM-5 Nugrahaningtyas, Khoirina Dwi; Zalfa, Syafira Nur; Rahmawati, Fitria; Nurcahyo, I.F.; Hidayat, Yuniawan
Jurnal Rekayasa Proses Vol 17 No 1 (2023): Volume 17, Number 1, 2023
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.76449

Abstract

Katalis logam transisi periode pertama (Fe, Co, Ni, Cu, atau Zn) berbasis Hydrogen Zeolite Socony Mobil – 5 (HZSM-5) merupakan katalis yang menjanjikan untuk berbagai macam reaksi. Pada penelitian ini akan dipelajari keperiodikan aktivitas dan kestabilan struktur katalis tersebut pada reaksi cracking anisol. Uji katalitik dilakukan dengan menggunakan reaktor semi alir. Produk dari hasil proses cracking anisol dianalisis menggunakan kromatografi gas-spektra massa (GC-MS), kemudian karakter katalis bekas seperti kristalinitas dan komposisi fasa dianalisis menggunakan X-ray diffraction (XRD), sedangkan luas permukaan dan porositas dianalisis menggunakan surface area analyzer (SAA). Hasil penelitian menunjukkan bahwa tidak nampak kaitan antara sifat periodik unsur dengan aktivitas katalitiknya. Karakter setiap katalis yang telah digunakan mengalami sedikit perubahan pada komposisi fasanya, terutama katalis Fe/HZSM-5 dan Co/HZSM-5, sedangkan luas permukaan dan porositasnya mengalami penurunan.
Pelatihan Keselamatan Bahan Gas Berbahaya Untuk Teknisi Mesin Pendingin Nurcahyo, I F; Heraldy, Eddy; Rahmawati, F; Nugrahaningtyas, Khoirina D; Hidayat, Yuniawan
Jurnal Pengabdian Masyarakat Indonesia Vol 4 No 1 (2024): JPMI - Februari 2024
Publisher : CV Infinite Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52436/1.jpmi.2031

Abstract

Pelatihan keselamatan bahan gas berbahaya untuk teknisi mesin pending telah dilaksanakan untuk teknisi mesin pendingin yang tergabung dalam paguyuban Aneka Jasa Teknik Surakarta (AJTS). Kecelakaan kerja berkaitan dengan gas freon banyak diberitakan di dunia maya. Paguyuban AJTS merupakan perkumpulan dari teknisi yang banyak berkecimpung sebagai teknisi mesin pendingin terutama AC, kulkas, dan freezer di Solo Raya. Pelatihan ini penting untuk dilakukan untuk membekali teknisi tersebut agar selamat dalam perakitan dan perbaikan mesin pendingin. Pelatihan ini dilaksanakan secara luring meliputi ceramah keselamatan bahan, praktek mengenal MSDS, dan praktek mendeteksi kebocoran gas freon menggunakan alat leaking detektor. Hasil pelatihan antara lain: peserta paham tentang bahaya gas freon dan pencegahan kecelakaan kerja dalam penanganan mesin pendingin. Pelatihan sangat bermanfaat bagi teknisi mesin pendingin terutama peserta pelatihan dan pembaca artikel ini, sehingga keselamatan kerja dapat tercapai.
Co-Authors Ana Sofiana, Ana Arif R. Hakim, Arif Arifin Dwi Saputro, Arifin Dwi Bagus Swandito, Paulus Budiman, Anatta Wahyu Candra Purnawan Dwi Nugrahaningtyas, Khoirina Eddy Heraldy Edi Pramono Edy Pramono Fadlulloh, Zaki Fitria Rahmawati Hartini Hendrastuti, Priska Julia I F Nurcahyo, I F IF. Nurcahyo, IF. Ivandini Tribidasari Anggraningrum Jati Wulansari, Jati Joko Sutrisno Khoirina Dwi Nugrahaningtyas Mudjijono Mudjijono, Mudjijono Nugrahaningtyas, Khoirina D Nur Aini Nurcahyo, I. F. Nurcahyo, I.F. Nurcahyo, Idul Fitri Paramartha, I Gusti Ayu Filia Patiha Patiha, Patiha Putri, Denis Octareta Amelia Qurrotul'aini, Nisriina 'Abidah Rahmawati, F Ridwan, Qanita Sabiila Gusti, Aji Indo Saputri, Dini Deviana Sayekti Wahyuningsih Siswandari Siswandari, Siswandari Tiara Diah Saputri, Tiara Diah Triyono . Wega Trisunaryati, Wega Zalfa, Syafira Nur