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All Journal Jurnal Penelitian Saintek EKSAKTA: Journal of Sciences and Data Analysis Jurnal Sains Dasar Indonesian Journal of Chemistry Molekul: Jurnal Ilmiah Kimia Indonesian Journal of Chemistry and Environment Jurnal Elemen Kimia

Cahyorini Kusumawardani

Universitas Negeri Yogyakarta

Author-ID : 2977204

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Materials Science & Nanotechnology

Published : 18 Documents Claim Missing Document

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Optimasi Waktu dan Suhu Hidrotermal pada Sintesis Nanotabung TiO2 Terdoping Nitrogen untuk Aplikasi Fotokatalis Khoiriyah Lukman, Laila; Kusumawardani, Cahyorini
Jurnal Sains Dasar Vol 9, No 2 (2020): October 2020
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v9i2.38969

Nanotabung nitrogen-doped TiO2 (N-TiO2) disintesis dengan metode hidrotermal dari titanium tetra isopropoksida (TTIP) sebagai precursor Ti, etilendiamin sebagai sumber nitrogen dan etanol sebagai pelarut. Pengaruh parameter sintesis dipelajari dengan melakukan variasi suhu (110, 130, dan 150ºC) dan waktu hidrotermal (24, 48, dan 72 jam). Material hasil sintesis dikarakterisasi menggunakan XRD dan spektroskopi UV-Vis DRS. Aktivitas fotokatalitik material nanotabung N-TiO2 diuji dalam reaksi degradasi metilen biru dilakukan. Hasil penelitian menunjukkan bahwa kenaikan suhu hidrotermal dan lama waktu hidrotermal menyebabkan ukuran kristal semakin besar, dan Egmenurun. Uji fotokatalis material hasil sintesis menunjukkan hasil terbaik pada sampel hasil sintesis pada temperatur 130ºC selama 48 jam yang memiliki karakteristik strukur lebih kristalin, energi celah pita yang relatif rendah, dan mampu mendegradasi metilen biru sebesar 74,94% di bawah sinar UV.

EFFECT OF RATIO VARIATION Mg / AL IN SYNTHESIS OF HYDROTALSIT WITH HYDROTHERMAL COPRECIPITATION METHOD Sri Handayani; Cahyorini Kusumawardani; Kun Sri Budiasih
Jurnal Penelitian Saintek Vol 19, No 1: April 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Catalyst are divided into two kinds, homogeneous and heterogeneous catalysts. The catalys tthat constantly developed isa heterogeneous catalyst because could be separated easily and reuseable. The purpose of this research were synthesis and characterization of hydrotalcite Mg/Al as a heterogeneous catalyst which can be use din the aldol condensation reaction. Synthesis hydrotalcite was conducted by hydrothermal coprecipitation method. Synthesis performed with variations mol Mg/Alat a temperature hydrothermal 1000C for 15 hours. Hydrotalcite as a heterogeneouscatalyst preparation was done by calcinationat 4000C. Characterization of synthesized hydrotalcyte was performed by FTIR to identified functional group and XRD analysis to characteriz edits structure. The results showed that the optimum conditions for the synthesized hydrotalcite was obtained atmole ratio Mg/Al3:1.

INFLUENCE OF CALCULATION TEMPERATURE TO HIDROTALSIT Mg / Al WHICH IS DISINTESTED THROUGH UNSECUAL METHOD OF PRESIPITATION Hasan Adidarma; Sri Handayani; Cahyorini Kusumawardani; Kun Sri Budiasih
Jurnal Penelitian Saintek Vol 19, No 2: Oktober 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research aims to determine the effect of calcination temperature variation from 200°C to 500°C on the Mg/Al hydrotalcite structure. Mg/Al hydrotalcite has been synthesized via a low supersarturated precipitation method with hydrothermal treatment, using Mg(NO3 )2 .6H2 O and Al(NO3 )3 .9H2 O as the raw materials, and base solution of NaOH and Na2 CO3 as the precipitators. Mg/Al hydrotalcite compound synthesized before and after calcination were characterized using fourier transform infrared (FTIR) and X-ray diffractometer (XRD). The results of FTIR and XRD data analysis showed that the calcination of hydrotalcite of Mg/Al at 200o C did not changed the structure of hydrotalcite compounds, calcination at temperatures 300-400o C showed that structure of hydrotalcite compound starts to change form a mixture of magnesium oxide and aluminum, and calcination at 500°C showed that the crystal structure of Mg/Al hydrotalcite has broken to form a mixture of metal oxides, namely MgO (phericlase) with a little mixture of aluminum oxide in the form of θ-Al2O3 and γ-Al2O3.

Synthesis of Mg/Al Hydrotalcite by Using Low Supersaturated Precipitation Method with Variation of Mole Ratio Christanty Wahyu Septyaningrum; Sri Handayani; Cahyorini Kusumawardani; Kun Sri Budiasih
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 14, ISSUE 2, August 2014
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol14.iss2.art1

This research aims to synthesize Mg/Al hydrotalcite with mole ratio variations of Mg/Al precursor through low supersaturated precipitation method. Mg/Al hydrotalcite was synthesized with Mg/Al mole ratio variation of 1:1, 2:1, 3:1, and 4:1. Mg/Al hydrotalcite was synthesized using NaOH and Na2CO3 base solutions. The mixture of precursor was stirred for 2 hours then treated by hydrothermal at 100 °C for 4 hours. Results of the synthesis Mg/Al hydrotalcite with mole ratio variations is a white powder. The formation of the structure of Mg/Al hydrotalcite showed by certain peaks in the FTIR spectra and XRD diffractogram.The results of data analysisshowed that variation of mole ratio Mg/Alcauses a shift of peak in the XRD diffractogram shifted towards the left along with a comparative increase in mole ratio Mg/Al, but the main functional groups on the compound Mg/Al hydrotalcite increasingly formed with better.

Sintesis dan Karakterisasi Senyawa Perovskite BaSnO3 melalui Metode Sol-Gel untuk Aplikasi Sel Surya Erna Warisman; Cahyorini Kusumawardani
Jurnal Sains Dasar Vol 7, No 2 (2018): October 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v7i2.38554

Penelitian ini bertujuan untuk mengetahui pengaruh variasi konsentrasi prekursor sintesis BaSnO3 terhadap struktur dan karakter elektronik N-TiO2 dan mengetahui efisiensi sel surya N-TiO2 tersensitisasi BaSnO3. Sintesis dilakukan menggunakan prekursor BaCl2 dengan variasi 10; 7,5; 5; 2,5; dan 1 mmol dan SnCl4. Selanjutnya masing-masing prekursor dilarutkan ke dalam 80 mL etanol absolut, kemudian larutan tersebut diaduk selama 1 jam agar homogen. Selanjutnya di tambahkan tetes demi tetes 20 mL H2O2 ke dalam larutan tersebut sambil dilakukan pengadukan selama 2 jam. NH4OH pekat ditambahkan tetes demi tetes sampai pH campuran mencapai 10. Endapan dipisahkan dari filtratnya menggunakan kertas saring dan dicuci dengan air terdemineralisasi. Material putih hasil sintesis dikeringkan dalam oven pada temperatur 80oC selama 2 jam dan dikalsinasi pada temperatur 900oC selama 2 jam untuk menghasilkan padatan berwarna kuning. Hasil XRD menunjukkan bahwa senyawa BaSnO3 yang disintesis berbentuk kubik dengan nilai parameter kisi antara 4.11651 Å dan 4.11342 Å. Hasil karakterisasi UV-Vis menghasilkan nilai energi celah pita senyawa BaSnO3 antara 3,02 – 3,17 eV. Setelah material N-TiO2 disensitisasi dengan BaSnO3 2,5 mmol energi celah pita mengalami penurunan dari 3,17 menjadi 2,98 eV. Aktivitas fotovoltaik menunjukkan efisiensi konversi sel surya senyawa N-TiO2/BaSnO3 berbagai variasi prekursor mmol BaCl2 menghasilkan nilai antara 1,95 - 3,2%. Senyawa BaSnO3 5 mmol mempunyai nilai efisiensi konversi sel surya yang paling tinggi yaitu 3,2%. Hasil karakterisasi SEM EDX menunjukan morfologi permukaan senyawa BaSnO3 yang homogen dan perbandingan atom sebesar 0,242 : 0,136 : 0,018.

The Influence of pH on the Nitrogen-doped TiO2 Structure and Its Photocatalytic Activity on Methylene Blue Degradation Cahyorini Kusumawardani; Kristiyan Handoyo Sugiyarto; Anti Kolonial Prodjosantoso
Molekul Vol 16, No 3 (2021)
Publisher : Universitas Jenderal Soedirman

The mesoporous nitrogen-doped titania (N-doped TiO2) has been synthesized through sol-gel method by refluxing the precursor mixture, continued by hydrolysis process, and then followed by annealing in air at the desired temperature. The pH of precursor mixture solution before hydrolysis process has been varied to study their influence on the resulting N-doped TiO2. The resulting material were characterized using X-Ray Diffraction (XRD), N2 Gas Sorption Analyzer (GSA), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), and UV Vis Spectrophotometer. The XRD analysis result showed that the pH and water content played an important role on the crystal formation of the N-doped TiO2. The result showed that a high acidity condition resulted in a favored tendency of anatase crystalline phase, while lowering acidity leaded to the rutile formation. Porosity analysis showed the significant influence of pH in the synthesis process on the pore characteristic and pore size distribution of the resulting material. The photocatalytic activity was tested on the methylene blue degradation system comparing to pure TiO2 and commercial Degussa P25 and the result showed that the synthesized N-doped TiO2 provided better photocatalytic activities.

THE PREFERENTIAL STRUCTURE OF Co2+ SOLVATION IN AQUEOUS AMMONIA SOLUTION DETERMINING BY MONTE CARLO SIMULATION Cahyorini Kusumawardani; Sukisman Purtadi; Crys Fajar Partana; Harno Dwi Pranowo; Mudasir Mudasir
Indonesian Journal of Chemistry Vol 7, No 1 (2007)
Publisher : Universitas Gadjah Mada

A Monte Carlo simulation was performed for Co2+ in 18.6 % aqueous ammonia solution at a temperature of 293.16 K, using ab initio pair potentials and three-body potentials for Co-H2O-H2O, Co-NH3-NH3 and Co-H2O-NH3 interactions. The first solvation shell consists average of 2.9 water and 3.2 ammonia molecules, and the second shell of 10.4 water and 11.2 ammonia molecules. The structure of the solvated ion is discussed in terms of radial distribution functions, angular distributions and coordination number.

MONTE CARLO SIMULATIONS OF Co (II) IN WATER INCLUDING THREE-BODY CORRECTION Cahyorini Kusumawardani; Harno Dwi Pranowo; Crys Fajar Partana; Mudasir Mudasir
Indonesian Journal of Chemistry Vol 6, No 3 (2006)
Publisher : Universitas Gadjah Mada

In order to describe the cobalt-water interaction correctly, a new ab initio potential was developed consisting of pair interaction terms as well as three-body contributions. Within this approach, it was possible to correct for the well-known failures of pair potentials in describing solvation phenomena of such ions. A first-shell coordination number of 6 in agreement with experimental data were obtained from Monte Carlo simulations of a single cobalt (II) ion in water. The structure of hydrated ion is discussed in terms of radial density functions and coordination number, energy and angular distributions.

GAS PHASE STRUCTURE AND STABILITY OF COMPLEX FORMED BY H2O, NH3, H2S AND THEIR METHYL DERIVATIVES WITH THE CATION CO2+ Cahyorini Kusumawardani
Indonesian Journal of Chemistry Vol 4, No 2 (2004)
Publisher : Universitas Gadjah Mada

Ab initio molecular orbital calculations at the Hartree-Fock-Self Consistent Field (HF-SCF) have been performed in order to determine the structure and gas phase energies of complex formed by the Lewis bases of H2O, NH3, H2S and their methyl derivatives with the cation Co2+. The relative basicities of the base studied depend on both the substituent. The gas-phase interaction energies computed by the SCF method including electron correlation Møller-Plesset 2 (MP2) dan Configuration Iteration (CI) were comparable in accuracy. The binding energies computed by these two methods reach the targeted chemical accuracy.

Synthesis and Structural Analysis of Powder Complex of Tris(bipyridine)cobalt(II) Trifluoromethanesulfonate Octahydrate Kristian Handoyo Sugiyarto; Cahyorini Kusumawardani; Kristanti Eka Wulandari
Indonesian Journal of Chemistry Vol 18, No 4 (2018)
Publisher : Universitas Gadjah Mada

The powder complex of tris(bipyridine)cobalt(II) trifluoromethanesulfonate octahydrate has been synthesized by direct interaction of the corresponding aqueous solutions (and drops of ethanol) of cobalt(II) nitrate, bipyridine, and potassium triflate. The yellow-orange powder produced was filtered off and allowed to dry on an aeration for characterization. AAS measurement showed the content of metal to be 6.06%, corresponding to the theoretical value of 6.06% in [Co(bipy)3](CF3SO3)2.8H2O. The analysis of conductance producing the charge ratio of cation to anion to be 2:1, confirms the formula. The magnetic moment, µeff, of this complex which was to be 4.5-4.9 BM, indicates that the complex is paramagnetic corresponding to the three unpaired electrons with a significantly orbital contribution. UV-Vis spectrum of the complex reveals the first band observed at about 11100 cm–1, which is associated with the spin-allowed transition, 4T1g → 4T2g. A distinct shoulder at only about 16100 cm–1 should be associated with the spin-forbidden transition of 4T1g → 2T2g,2T2g (G). The expected second and third bands which are associated with spin-allowed transitions of 4T1g → 4T1g(P) and 4T1g → 4A2g at higher energy were not well resolved. The infrared spectrum shows absorptions of the functional group of ligand which is influenced by the metal-ligand interaction in this complex. The powder XRD of this complex was refined using Le Bail method of Rietica program and found to be fit as monoclinic symmetry with a space group of C2/c.

Co-Authors A.K Prodjosantoso A.K Prodjosantoso Anti Kolonial Prodjosantoso Ari Safitri Bintang Tanjung Sari Christanty Wahyu Septyaningrum Cindy Candrika Anugrahayu Crys Fajar Partana Crys Fajar Partana Denny Hadya Khoirulfatihin Diandari Siti Nur Ichsani Erna Warisman Harno Dwi Pranowo Harno Dwi Pranowo Hasan Adidarma Khoiriyah Lukman, Laila Kristanti Eka Wulandari Kristian Handoyo Sugiyarto Kristiyan Handoyo Sugiyarto Kun Sri Budiasih Kun Sri Budiasih Misbah Rijal Ulhaq Mudasir Mudasir Mudasir Mudasir Sri . Handayani Sri Handayani Sukisman Purtadi Vatrika Anggriana Putri Yuzzaini Dwi Kurniawati

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