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All Journal Sodality: Jurnal Sosiologi Pedesaan Jurnal Rekayasa Proses International Journal of Renewable Energy Development JURNAL KIMIA SAINS DAN APLIKASI The Journal of Pure and Applied Chemistry Research Journal of Mathematical and Fundamental Sciences Jurnal Riset Kimia ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Jurnal Rekayasa Proses Edulingua: Jurnal Linguistiks Terapan dan Pendidikan Bahasa Inggris JPPS (Jurnal Penelitian Pendidikan Sains) SEMAR Renjana Pendidikan Dasar International Journal of Science and Society (IJSOC) Makara Journal of Science Jurnal Natural Jurnal MIPA dan Pembelajarannya Molekul: Jurnal Ilmiah Kimia Prosiding Temu Ilmiah Nasional Guru International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Muara: Jurnal Manajemen Pelayaran Nasional Jurnal Rekayasa Proses

Fitria Rahmawati

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

Author-ID : 356186

Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Neuroscience Physics Social Sciences Other

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The Composite of ZrO2-TiO2 Produced from Local Zircon Sand Used as A Photocatalyst for The Degradation of Methylene Blue in A Single Batik Dye Wastewater Ita Permadani; Dhini A. Phasa; Andini W. Pratiwi; Fitria Rahmawati
Bulletin of Chemical Reaction Engineering & Catalysis 2016: BCREC Volume 11 Issue 2 Year 2016 (August 2016)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.11.2.539.133-139

In this research, a composite of ZrO2-TiO2 was used as a photocatalyst in the degradation of dye wastewater. The dye waste water is a single Methylene Blue, MB, wastewater from Batik industry. Meanwhile, the ZrO2 was prepared from zircon sand founded from Bangka Island, Indonesia. The composite was prepared at various weight ratio and heat treated at 500 oC. The result shows that the purity of ZrO2 from zircon sand is only 66.46 %. However, the addition of ZrO2 into TiO2 able to increase the photocatalytic activity proven by 88.75 % degradation of MB at a ZrO2-TiO2 weight ratio of 1:1. The result is higher than the degradation with anatase TiO2; that is only 62.67 %. The kinetics study found that the photocatalytic degradation of MB with single TiO2 has the rate constant of 1.85x10-2 minutes-1. Meanwhile, the rate constant of the MB degradation with the composite ZrO2-TiO2 is 16.73x10-2 minutes-1.

The Effect of Mole Ratio Natural-CaCO₃/KF in the Synthesis of KCaF₃ Perovskite Base Catalyst I. F. Nurcahyo; Eddy Heraldy; Suciana Nur Cahyaningsih; Fitria Rahmawati; Khoirina Dwi Nugrahaningtyas; Yuniawan Hidayat; Firanda Larasati
Jurnal Kimia Sains dan Aplikasi Vol 27, No 8 (2024): Volume 27 Issue 8 Year 2024
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.27.8.388-394

The KCaF3 perovskite catalyst was successfully synthesized by reacting limestone (natural-CaCO3) with potassium fluoride (KF). The synthesis of the KCaF3 catalyst was conducted with several variations in the mole ratio of CaCO3 to KF (1:1, 1:2, and 1:3). The research results showed that the addition of KF can affect the characteristics of the catalyst. The optimal catalyst is the KCaF3 catalyst with a mole ratio variation of 1:3. X-ray diffractometer analysis revealed that the highest KCaF3 phase composition reached 74.05%, while thermogravimetric analysis indicated a CaCO3 concentration of 34.50%. Surface Area Analyzer analysis shows that KCaF3 has the largest surface area, which is 187.1 m2/g. This catalyst efficiently facilitated the transesterification of palm oil, yielding 93.4% biodiesel.

Peramalan jumlah wisatawan mancanegara ke indonesia dengan menggunakan metode autoregressive integrated moving average with exogenous variable (ARIMAX) efek variasi kalender libur akhir tahun Rahmawati, Fitria; Lestari, Trianingsih Eni
Jurnal MIPA dan Pembelajarannya Vol. 2 No. 11 (2022): Nopember
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um067v2i112022p8

Sektor pariwisata di Indonesia merupakan salah satu andalan untuk menyerap devisa Negara. Salah satunya dari wisatawan mancanegara yang berkunjung ke Indonesia, dimana biasanya meningkat pada libur akhir tahun. Besarnya potensi ini membuat para investor asing berlomba-lomba menanamkan modal untuk membangun hotel yang dapat berakibat over supply. Untuk menangani hal tersebut diperlukan prediksi jumlah wisatawan yang akurat dengan melakukan peramalan yaitu dengan analisis deret waktu. Ketika data deret waktu memiliki variabel lebih dari satu yang disebut juga sebagai data multivariat misalkan dengan adanya penambahan variabel dummy efek variasi kalender libur akhir tahun maka salah satu metode peramalan yang bisa digunakan adalah dengan Autoregressive Integrated Moving Average with Exogenous Variable (ARIMAX) Efek Variasi Kalender. Metode ARIMAX adalah modifikasi dari model ARIMA Seasonal dengan penambahan variabel eksogen yaitu variabel dummy dan periode waktu.Dengan melihat permasalahan tersebut, penelitian ini bertujuan mengetahui model deret waktu terbaik untuk meramalkan jumlah wisatawan mancanegara dengan metode ARIMAX serta mengetahui hasil peramalan jumlah wisatawan mancanegara dengan metode ARIMAX. Berdasarkan hasil analisis terhadap jumlah wisatawan mancanegara, diperoleh bahwa model terbaik peramalan sebagai berikut Y_t=475158,2+98619,9D_1t+3650,5t+a_t 〖(1- 0,22055B)〗^(-1) 〖(1-0,48107B^12)〗^(-1) Dari model diatas diketahui bahwa peramalan untuk data ke-t dipengaruhi oleh efek variasi kalender libur akhir tahun dan periode waktu pada saat ke-t. Dan hasil peramalan jumlah wisatawan yang datang ke Indonesia dengan metode ARIMAX pada bulan Januari 2016 dan bulan februari 2016 sebesar 814052,96 dan 858423,27 orang.

Screen printed carbon electrode from coconut shell char for lead ions detection Heliani, Kinkind Raras; Rahmawati, Fitria; Wijayanta, Agung Tri
International Journal of Renewable Energy Development Vol 13, No 1 (2024): January 2024
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2024.57679

This research aimed to produce a screen-printed carbon electrode (SPCE) from an activated coconut shell carbon. As a raw material, coconut shell char provides renewability and is abundantly available in the market. Meanwhile, SPCE offers a simple electroanalytical electrode because the working, counter, and reference electrodes are in one piece. The coconut shell carbon was activated by steam at 700 oC for 1h, producing AC700 that was then characterized to ensure the result by following per under carbon as the main component, the phases, crystal structure, surface area, morphology, and elemental content. The result showed that the surface area of AC700 is 816 m2/g, and the surface structure is porous, as identified by SEM images. Impedance analysis followed by data fitting and conductivity calculation found a high conductivity of 8.68 x 10-2 Scm‑1. The produced-SPCE or SPAC700 was modified by ferrocene at various compositions of 10%; 20%; and 30% of mass. The SPAC700-Fc30 provided the best performance for lead analysis with a detection limit of 0.35 mM, a quantitation limit of 1.17 mM, and good reproducibility with a Repeatability Coefficient (RC) of 0.022. SPAC700-Fc30 showed good lead ions detection despite under 10% Cu2+ and 10% Co2+ interferences. The result confirmed the potential use of coconut shell char as the raw material for SPCE production.

Kinetics Study on Thermal Degradation of Polystyrene and Sulfonated Polystyrene from Styrofoam Waste Pramono, Edi; Dewi, Chintya; Rahmawati, Fitria
Molekul Vol 18 No 3 (2023)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2023.18.3.7306

This research studied kinetics of thermal degradation of polystyrene (PS), and sulfonated polustyrene (sPS) which were synthesized from styrofoam waste. The thermal study was conducted by thermogravimetric analysis (TGA) at various heating rate of 10, 15, 20 and 25 dpm. The kinetics parameters were determined by Coats Redfern (CR), Friedman (FM), Kissinger-Akahira-Sunose (KAS) and Ozawa-Flynn-Wall (OFW) models. TGA result found that PS has range thermal stability of 274 – 415 oC, but sPS has range thermal stability of 175 – 582 oC. Kinetic study to PS shows that the activation energy increases by the increasing of fraction conversion for all kinetics parameters with a regression value close to 1. While in sPS, the CR method shows an increase in activation energy value with an increasing fraction convertion. On the other hand, CR-FM-KAS and OFM methods obtained an increase in activation energy, then decreased at the fraction convertion above 0.6, and received negative activation energy. The kinetics model successfully explains the degradation of PS and sPS. In addition, the high thermal stability of sPS from styrofoam waste shows that this material has good potential as polymer electrolyte materials.

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. 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.

PEMANFAATAN VIDEO PEMBELAJARAN PADA MATERI POKOK SUHU, KALOR, DAN PEMUAIAN DI SMP DARUL MUTA’ALLIMIN SIDOARJO Rahmawati, Fitria; Widiasih
Prosiding Temu Ilmiah Nasional Guru Vol. 15 No. 1 (2023): TING XV 2023
Publisher : Fakultas Keguruan dan Ilmu Pendidikan (FKIP), Universitas Terbuka

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

The emergence of various interesting videos when accessing the internet, makes students more comfortable watching videos compared to opening textbooks. On the other hand, the science learning outcomes of grade VII A students of Darul Muta'allimin Junior High School were found that only 10.34% of students were able to achieve KKM (>75). The study aims to implement the assignment of heat material without using paper (paperless) but using video media which is expected to increase student activity and learning outcomes of grade VII A students at SMP Darul Muta'allimin for the 2022/2023 school year. The research method used is classroom action research in the form of pre-cycle activities and carried out in 2 cycles with student activity observation instruments and student learning outcomes evaluation sheets. Analysis of the average learning outcomes of grade VII A students has increased significantly, from 54.14 to 78.96. The percentage of class learning completeness reached 79.31%. The number of students completed is 23 students. Students show readiness and activeness in participating in learning activities after getting video assignments. There are 6 students who have not been able to complete their learning influenced by several factors, namely internal factors (interests, talents, motivation, learning methods, psychological aspects) and external factors (social environment, friendships, and family). The results showed that giving video assignments was able to improve student learning outcomes on temperature, heat, and expansion material at SMP Darul Muta'allimin.

A dry cold sintering to Ta doped-lithium lanthanum zirconate solid electrolyte for all-solid-state lithium metal battery Rahmawati, Fitria; Alaih, Imam Shofid; Rosalin, Azka W; Nurcahyo, I F; Nursukatmo, Hartoto; Nilasary, Hanida; Oktaviano, Haryo S.; Raihan, Edo; Muzayanha, Soraya U.; Handaka, Muhammad F. A.
International Journal of Renewable Energy Development Vol 13, No 5 (2024): September 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60351

Solid electrolyte is the essential part in all-solid-state battery (ASSB), in which the sintering step is vital to get a dense and high ionic conductivity. However, Li-loss frequently occurs at a high temperature, causing ionic conductivity to drop. This research investigated a dry-cold sintering process (dry-CSP) to Ta doped-LLZO (LLZTO), in which the LLZTO powder was pressed by cold isostatic pressing (CIP) at 40 MPa without solvent addition and then heated at 300oC for 2h. XRD analysis found that LLZTO300C40P remains crystallized in a single cubic with ionic conductivity of (3.02 0.53) x 10-5 Scm-1, which is higher than another result in Al doped-LLZO by CSP uniaxial pressing and with moistened-solvent (wet-CSP). The feasibility was tested by preparing a coin cell with a LiCoO2 cathode and Li metal anode. Cyclic voltammogram of the LCO-LLZTO300C40P-Li ASSB provides a high current density representing a higher electrochemical reaction rate inside the full cell. The battery ran well with an initial charging capacity of 88 mAh/g, and a discharge capacity of 50 mAh/g, providing 56.8 % Coulombic Efficiency. An interface engineering between electrode-solid electrolyte is essential to develop the ASSB performance.

The Influencing Factors of Access and Control Men and Women in Community Forest Resources Management Rahmawati, Fitria; Abdulkadir-Sunito, Melani
Sodality: Jurnal Sosiologi Pedesaan Vol. 1 No. 3 (2013): Sodality: Jurnal Sosiologi Pedesaan
Publisher : Departement of Communication and Community Development Sciences, Faculty of Human Ecology

Tujuan penelitian ini yaitu mendeskripsikan profil aktivitas laki-laki dan perempuan pada kegiatan reproduktif, produktif dan sosial kemasyarakatan, mendeskripsikan profil akses dan kontrol laki-laki dan perempuan dalam pengelolaan sumberdaya hutan rakyat, membandingkan faktor-faktor yang berpengaruh terhadap akses dan kontrol laki-laki dan perempuan dalam pengelolaan sumberdaya hutan rakyat. Responden adalah petani rumah tangga dan buruh tani yang bekerja di hutan rakyat. Penelitian ini mengindikasikan bahwa dalam kegiatan reproduktif, perempuan pada rumahtangga buruh tani memiliki curahan waktu lebih tinggi daripada perempuan pada rumah tangga petani dan dalam kegiata produktif laki-laki pada rumahtangga buruh tani memiliki curahan waktu lebih tinggi daripada laki-laki pada rumahtangga petani. Faktor penguasaan lahan rumahtangga, keikutsertaan suami-istri dalam kegiatan kelompok dan pengetahuan lokal suami istri dalam budidaya tanaman di lahan hutan mempengaruhi akses kontrol pada rumahtangga petani terlebih pada laki-laki sedangkan pada rumahtangga buruh tani faktor-faktor tersebut tidak mempengaruhi akses dan kontrol atas sumberdaya dalam kegiatan pengelolaan hutan rakyat. Kata kunci : akses dan kontrol, pengelolaan hutan rakyat, rumahtangga buruh tani, rumahtangga petani, gender, laki-laki dan perempuan.

Green tea (Camellia sinensis L.) potential to liver of hyperuricemia rats (Rattus norvegicus) fed with high purine diet NUGRAHENI, PUTRANTY WIDHA; MAHDI, CHANIF; RAHMAWATI, FITRIA; ANALITA, RIZKI NUR
Jurnal Natural Volume 24 Number 3, October 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i3.29599

Uric acid is produced in tissues containing xanthine oxidases, like the small intestine and liver, as involved in the purine metabolism of adenine and guanine. High uric acid levels cause damage to cell membranes due to the lipid peroxidase chain reaction. Foods containing high purines will activate the xanthine oxidase (XOD), causing an increase in free radicals. Free radicals attack polyunsaturated fatty acids (PUFA) by forming lipid peroxides. PUFA molecules contain multiple double bonds, which make them susceptible to oxidation by reactive oxygen species (ROS), such as free radicals. PUFA will be broken into simple compounds such as pentane, ethane, and aldehydes, leading to malondialdehyde (MDA) formation. High MDA levels illustrate the process of cell membrane oxidation leading to cell membrane damage. Hyperuricemia is often treated using synthetic drugs such as allopurinol; however, it can cause side effects. Some people will choose medicinal plants with minimal side effects. Green tea (Camellia sinensis L.) contains many polyphenol antioxidants, especially flavonoids, which also have a strong antioxidant effect by exerting multiple mechanisms such as inhibiting several enzymes, including antiphospholipid peroxidase, free radical scavengers, metal bonds, and xanthine oxidase (XOD). Statistical analysis results proved that green tea with a dose of 600 mg/kg BW could decrease the level of MDA in the liver by 84.87% (p 0.01) and reduce the activity of XOD by 35.36% (p 0.01). Taken together, green tea can improve liver histopathology.

Co-Authors -, Patiha Abu Masykur Abu Masykur Agung T. Wijayanta Agung Tri Wijayanta AGUS PURWANTO Agustin Widyowati Alaih, Imam Shofid Andini W. Pratiwi Anggia Putri Gustami Arikasuci Fitonna Ridassepri Aryanthi, G. Ayu Aryunani ., Aryunani Aulia, Nabila Putri Bagus Swandito, Paulus Bintang Junita Siagian, Bintang Junita Byba Melda Suhita Chanif Mahdi Chintya Dewi, Chintya Dani G Syarif Dedi Rohendi Dhini A. Phasa Dian Irianti Dian Irianti Dian Maruto Widjonarko Dwi Aman Nur Romadhona Dwi Nugrahaningtyas, Khoirina Dyah Purwaningsih Eddy Heraldy Eddy Heraldy Eddy Heraldy Eddy Heraldy Eddy Heraldy Eddy Heraldy Edi Pramono Fadlulloh, Zaki Firanda Larasati Gesyth Mutiara Hikhmah Al Ichsan Handaka, Muhammad F. A. Heliani, Kinkind Raras I F Nurcahyo I F Nurcahyo, I F I. F. Nurcahyo I.F. Nurcahyo IF Nurcahyo Imam Shofid Alaih Indah Rizki Fitriani, Indah Rizki Irvina M. Murni Irvinna Mutiara Murni Istiqomah, Ana Ulfa Ita Permadani Ivandini Tribidasari Anggraningrum Jin Miyawaki Jun Nakamura Kardi, Soeparman Karima Apriany Khoirina Dwi Nugrahaningtiyas Khoirina Dwi Nugrahaningtyas Khoirina Dwi Nugrahaningtyas Khoirina Dwi Nugrahaningtyas Khoirina Dwi Nugrahaningtyas Khoirina Dwi Nugrahaningtyas Khoirina Nugrahaningtyas Kinkind Raras Heliani Koji Nakabayashi Larasati Larasati Lisa Agustina Nurlaila Mahsus, Mahsus Maisaroh, Ummi Mawasthi, Wanodya Anggit Moedjijono Moedjijono Mohamad Syafri Mudjijono Mudjijono Muhammad A. Munir Muhammad Farhan Muzayanha, Soraya U. Nilasary, Hanida Nugraheni, Putranty Widha Nur Aini NUR FADILAH Nurani Handayani Nurcahyo, I. F. Nurcahyo, I.F. Nursukatmo, Hartoto Oktaviano, Haryo S. Pamularsih A.W Paramartha, I Gusti Ayu Filia Patiha - Pranoto . Puspitasari, Noviana Putri, Denis Octareta Amelia Qurrotul'aini, Nisriina 'Abidah Raihan, Edo Ridwan, Qanita Rini Wulandari Rini Wulandari Rizki Nur Analita Rochmi I. Apriyani, Rochmi I. Rosalin, Azka W Saputri, Dini Deviana Sayekti Wahyuningsih Sayekti Wahyuningsih Sayekti Wahyuningsih Sentot B. Rahardjo, Sentot B. Septia K Arifah Shobikah, Nanik Shota Sato Sidiq Fathonah Siti Rondiyah Sofia, Iva Suciana Nur Cahyaningsih Syafira Nur Zalfa Syoni Soepriyanto Syulfi Faiz Taufiiq-Yap Yun Hin Trianingsih Eni Lestari Viona Natalia Viona Natalia W.W, Soegimin Wanodya Anggit Mawasthi Widiasih Wijayanta, Agung Tri Witri Wahyu Lestari Wulan Cahya Inayah Yuni, Prima Novia Yuniawan Hidayat Yuniawan Hidayat Yuniawan Hidayat Yuniawan Hidayat Yuniawan Hidayat Yuniawan Hidayat Zalfa, Syafira Nur

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