Bambang Rusdiarso
Departemen Kimia, Universitas Gadjah Mada, Yogyakarta

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REDUKSI SENYAWA 6-AMINO-5-NITROSO URASIL MENJADI 5,6-DIAMINOURASIL (STUDI PENDAHULUAN) Suhartana, Suhartana; Rusdiarso, Bambang; Narsito, Narsito
Jurnal Kimia Sains dan Aplikasi Vol 3, No 1 (2000): Volume 3 Issue 1 Year 2000
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4090.218 KB) | DOI: 10.14710/jksa.3.1.177-181

Abstract

Telah dilakukan sintesis dan reduksi senyawa 6-amino-5-nitroso urasil (6-A-5-NU) menjadi 5,6 diaminourasil (DAU). Analisis kualitatif dilakukan dengan penentuan titik leleh dan spektra IR. Senyawa 5,6- Diaminourasil (DAU) disintesis dari urea dan etilsianoasetat dalam suasana enolat. Reaksi diawali dengan melalui pembentukan senyawa hasil antara senyawa 6-aminourasil, dan 6-Amino-5-Nitroso Urasil (keduanya madya yang stabil), sebelum diperoleh senyawa hasil akhir DAU. Hasil DAU yang diperoleh mempunyai titik leleh 249-254°C (literatur 257-258°C) dan rendemen yang diperoleh adalah 80,86%, kondisi optimum diperoleh dengan memakai reduktor amonium sulfida, dan suhu 40°C.
SYNTHESIS OF MESOPOROUS TITANIA BY POTATO STARCH TEMPLATED SOL-GEL REACTIONS AND ITS CHARACTERIZATION Budi, Canggih Setya; Kartini, Indriana; Rusdiarso, Bambang
Indonesian Journal of Chemistry Vol 10, No 1 (2010)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (603.682 KB) | DOI: 10.22146/ijc.21476

Abstract

Mesoporous titania powders with high-order crystalline building blocks had been synthesized through the sol-gel process using potato starch gel template. Internal spongelike pore structure of starch gel template was generated by heating the starch granules at 95 °C in water solution and freezing the starch gel at -15 °C. The synthesis routes were performed by immersing the starch gel template for 4 days into the white colloidal solution of TiO2 nanoparticles, which were prepared by hydrolyzing titanium (IV) tetraisopropoxide (TTIP) in ethanol at pH 1. Mesoporous TiO2 powders were obtained by two different ways of template removal, performed by calcination of the TiO2-starch composites at 600 °C for 4 h or combination of extraction with ethanol-HCl (2:1) at 80 °C and calcination at 500 °C for 4 h. Fourier Transform Infra Red (FT-IR) spectra shows both of template removal methods result in decreasing of characteristic vibrational band of the starch hydrocarbon on the resulted TiO2 powders. The X-Ray Diffraction (XRD) pattern imply that the concentrations of starch gel template influence the anatase crystallite peaks intensity of the synthesized TiO2 powders. TiO2 templated by 20% of starch sponges gel has highest intensity of anatase crystallite. Scherrer calculation inidicated that anatase particle size has nanoscale dimmension up to 12.96 nm. The nano-architecture feature of mesoporous TiO2 scaffolds was also evaluated by the Scanning Electron Microscope (SEM). It is shown that mesoporous TiO2 framework consist of nanocrystalline TiO2 particles as buiding blocks. The N2 adsorption-desorption isotherm curves assign that TiO2 powder resulted from extraction-calcination route has higher mesoporosity than that of only calcinated. The synthesized mesoporous TiO2 powder exhibits high Brunauer-Emmet-Teller (BET) specific surface area up to 65.65 m2/g.
Efek Deasetilasi Kitin Secara Bertahap Terhadap Derajat Deasetilasi Dan Berat Molekul Kitosan Junaidi, Ahmad Budi; Kartini, Indriana; Rusdiarso, Bambang
Jurnal Sains dan Terapan Kimia Vol 2, No 1 (2008)
Publisher : Jurnal Sains dan Terapan Kimia

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Abstract

Telah dilakukan kajian tentang preparasi kitosan yang dibuat dari kitin melalui proses deasetilasi bertahap menggunakan NaOH. Kitin diisolasi dari kulit udang putih Lampung (Litophenaeus vannamei). Derajat deasetilasi ditentukan dengan menggunakan metode spektroskopi FTIR dan berat molekul ditentukan dengan menggunakan metode viskometri. Efek deasetilasi kitin secara bertahap terhadap derajat deasetilasi dan berat molekul dipelajari dengan cara membandingkannya dengan deasetilasi secara kontinyu. Hasil penelitian menunjukkan bahwa deasetilasi kitin secara bertahap dapat meningkatkan derajat deasetilasi kitosan yang diperoleh secara signifikan dan tidak ada perbedaan berat molekul yang signifikan antara kitosan hasil deasetilasi bertahap dengan kitosan hasil deasetilasi kontinyu. Hal ini mengindikasikan bahwa konsentrasi NaOH sangat berpengaruh terhadap proses deasetilasi, tapi tidak signifikan berpengaruh terhadap proses depolimerisasi.Kata kunci : kitin, kitosan, deasetilasi bertahap, derajat deasetilasi, berat molekul.
SILVER NANOPARTICLES CAPPED WITH P-HYDROXYBENZOIC ACID AS A COLORIMETRIC SENSOR FOR THE DETERMINATION OF PARAQUAT Gusrizal, Gusrizal; Santosa, Sri Juari; Kunarti, Eko Sri; Rusdiarso, Bambang
Indonesian Journal of Chemistry ARTICLE IN PRESS
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1240.279 KB) | DOI: 10.22146/ijc.48806

Abstract

Highly stable silver nanoparticles capped with p-hydroxybenzoic acid were synthesized by reducing silver ion with p-hydroxybenzoic acid and used for the detection of paraquat. The synthesized silver nanoparticles, which are yellow, exhibited an absorption peak at 420 nm when measured with a UV-visible spectrophotometer due to the surface plasmon resonance. In the presence of paraquat, the color of silver nanoparticles changed from yellow to purple accompanied by the appearance of a new peak at 580 nm in addition to the peak at 420 nm. In order to obtain optimum experimental conditions, temperature, and time of reaction were optimized, and the ratio of absorbance obtained at 580 nm and 420 nm (A580/A420) were monitored. The A580/A420 is proportional to the concentration of paraquat. Under the most favorable condition, the calibration curve showed a high level of linearity ranging from 6.0 × 10?4 to 1.0 × 10?3 M, and the detection limit was found to be 8.30 × 10?6 M. Silver nanoparticles capped with p-hydroxybenzoic acid was found to be useful for the colorimetric determination of paraquat in the aqueous medium.
KINETIKA ADSORPSI ION EMAS(III) OLEH HIBRIDA MERKAPTO SILIKA Hamdiani, Saprini; Nuryono, Nuryono; Rusdiarso, Bambang
Jurnal PIJAR Vol 10, No 1 (2015)
Publisher : Jurnal PIJAR

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Abstract

Telah dilakukan kajian kinetika adsorpsi ion emas(III) oleh adsorben hibrida merkapto silika (HMS). HMS disintesis melalui proses sol-gel dengan prekursor natrium silikat (Na2SiO3) dari abu sekam padi. HMS dibuat dengan menambahkan asam klorida pada campuran senyawa 3-(trimetoksilil)-1-propantiol (TMSP) dan larutan Na2SiO3. Kinetika adsorpsi ditentukan dengan melakukan adsorpsi sistem statik (batch) dengan variasi waktu. Jumlah ion emas yang teradsorpsi dihitung secara kuantitatif berdasarkan selisih konsentrasi logam sebelum dan setelah adsorpsi yang dianalisis dengan spektroskopi serapan atom (SSA). Data menunjukkan interaksi HMS dengan ion emas cenderung mengikuti pola kinetika reaksi pseudo orde-2 dengan nilai konstanta laju reaksi (k) = 1x10-2 g mg-1min-1. Berdasarkan nilai perubahan energi bebas Gibbs adsorpsi standar (-ΔG°= 34,63-37,99 kJ/mol) menunjukkan bahwa adsorpsi berlangsung secara kimia (kemisorpsi).
Ekstraksi Adsorben Ramah Lingkungan dari Matriks Biologi: Asam Humat Tinja Kuda (AH-TK) Basuki, Rahmat; Santosa, Sri Juari; Rusdiarso, Bambang
CHEMPUBLISH JOURNAL Vol 2 No 1 (2017): Chempublish Journal
Publisher : Universitas Jambi

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Abstract

Telah berhasil dilakukan ekstraksi asam humat dari serbuk tinja kuda kering dan serbuk tinja kuda yang direndam terlebih dahulu dengan disinfektan. Metode ekstraksi dilakukan berdasarkan prosedur Stevenson (1994) di bawah atmosfer udara. Pemurnian dilakukan dengan larutan 0,1 M HCl/0,3 M HF (1:1). Hasil ekstraksi adalah 4 jenis asam humat dari tinja kuda yaitu, asam humat tinja kuda kotor (AHTK), asam humat tinja kuda murni (AHTK-Mur), asam humat tinja kuda desinfektan kotor (AHTK-Dis), dan asam humat tinja kuda desinfektan murni (AHTK-Dis-Mur). Karakterisasi keempat asam humat dari tinja kuda menggunakan spektrofotometer UV-Vis dan FT-IR menunjukkan pola serapan dan puncak-puncak serapan yang mirip dengan asam humat pembanding dari tanah gambut, yaitu asam asam humat tanah gambut (AHTG) dan asam humat tanah gambut murni (AHTG-Mur) yang merupakan pola/serapan karakteristik asam humat berdasarkan Stevenson (1994). Kadar abu AHTG, AHTG-Mur, AHTK, AHTK-Mur, AHTK-Dis, AHTK-Dis-Mur masing-masing sebesar 7,31; 1,20; 15,66; 0,99; 18,02; dan 1,82 % (b/b). Keasaman total AHTK, AHTK-Mur, AHTK-Dis, AHTK-Dis-Mur berturut-turut adalah 400,6; 415,3; 282,5; dan 333,1 cmol/kg. Hasil tersebut menunjukkan AHTK-Mur memiliki keasaman dan kadar abu paling baik.
FOTODEGRADASI SURFAKTAN ANIONIK NATRIUM DODESILBENZENASULFONAT TERKATALISIS TIO2 Ceristrisani, Normah; Rusdiarso, Bambang; Tri Wahyuni, Endang
Prosiding Seminar Nasional MIPA 2012: PROSIDING SEMINAR NASIONAL MIPA UNDIKSHA 2012
Publisher : Prosiding Seminar Nasional MIPA

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Abstract

AbstrakPenghilangan surfaktan anionik berupa natrium dodesilbenzenasulfonat (DBS) yang termasuk dalam golongan Linear Alkilbenzena Sulfonat (LAS), telah dilakukan melalui metode fotodegradasi terkatalisis TiO2. Dalam penelitian tersebut telah dipelajari pengaruh konsentrasi DBS dan waktu penyinaran terhadap efektivitas fotodegradasi DBS yang terkatalisis TiO2.Proses fotodegradasi surfaktan DBS dilakukan dengan cara menyinari campuran yang terdiri dari larutan DBS dan serbuk fotokatalis TiO2 dalam reaktor tertutup yang dilengkapi dengan lampu UV dan disertai pengadukan. Kondisi penelitian fotodegradasi adalah 50 mL larutan DBS dengan konsentrasi awal dan waktu penyinaran yang bervariasi. Hasil fotodegradasi ditentukan berdasarkan selisih konsentrasi DBS awal dengan konsentrasi DBS sisa dalam larutan setelah proses fotodegradasi menggunakan metilen biru melalui metode Spektrofotometri UV-Visibel.Hasil penelitian menunjukkan bahwa penambahan TiO2 dapat meningkatkan efektivitas fotodegradasi surfaktan DBS dari 15,27 % menjadi 98,55 % dari konsentrasi DBS awal 10 ppm. Fotodegradasi DBS terkatalisis TiO2 juga mengalami peningkatan dengan semakin besarnya konsentrasi DBS awal hingga optimum tercapai yaitu pada konsentrsi DBS awal 40 ppm, sebanyak 99,35 % DBS terdegradasi. Waktu penyinaran yang semakin lama dapat meningkatkan efektivitas fotodegradasi surfaktan DBS terkatalisis TiO2 sampai 24 jam dengan hasil degradasi sebesar 98,55 % dan untuk waktu yang lebih lama dapat menyebabkan penurunan efektivitas fotodegradasi.
SYNTHESIS OF MESOPOROUS METHYL-SILICA HYBRID FOR ADSORPTION OF ALIZARIN RED-S Rusdiarso, Bambang; Kunarti, Eko Sri; Hamdiani, Saprini
Indonesian Journal of Chemistry Vol 8, No 2 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.943 KB) | DOI: 10.22146/ijc.21622

Abstract

Mesoporous methyl-silica hybrid has been synthesized through sol-gel process, by using tetraethylorthosilicate and methyltriethoxysilane as precursors and tartaric acid as a template. The adsorbent was applied to study the adsorption of alizarin red-S. The preparation of methyl-silica hybrid was carried out at various mol ratios of precursors and tartaric acid concentration. The methyl-silica hybrid result was characterized by infrared spectroscopy, X-ray diffraction, and surface area analyzer. Adsorption experiment was conducted to study the effect of pH and Alizarin Red-S concentration on the adsorption capacity of the adsorbent. The adsorbed Alizarin Red-S was calculated from different of Alizarin Red-S concentration before and after adsorption based on the analysis with UV-Vis method. Characterization with Infrared Spectroscopy showed that methyl-silica hybrid has been successfully synthesized as indicated by appearance of characteristic functional group vibrations i.e Si-C, silanol (Si-OH) and siloksan (Si-O-Si). The X-ray diffraction data showed amorphous structure of methyl-silica Hybrid. The Surface Area Analyzer analysis data showed that the pore diameter and surface area of methyl-silica hybrid tended to increase as the template concentration increases. Adsorption study of methyl-silica hybrid showed that the adsorption decreased as the pH was increased. The optimum adsorption was obtained at pH=2.0 with the concentration of Alizarin Red-S of 70 mg/L.
Evaluation of Lagergren Kinetics Equation by Using Novel Kinetics Expression of Sorption of Zn2+ onto Horse Dung Humic Acid (HD-HA) Rusdiarso, Bambang; Basuki, Rahmat; Santosa, Sri Juari
Indonesian Journal of Chemistry Vol 16, No 3 (2016)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (363.011 KB) | DOI: 10.22146/ijc.21151

Abstract

Extraction and purification of humic acid from dry horse dung powder (HD-HA) was performed successfully and the purified HD-HA was then applied as sorbent to adsorb Zn2+. Extraction and purification were performed based on procedure of Stevenson (1994) under atmospheric air. Parameters investigated in this work consist of effect of medium sorption acidity, sorption rate (ka) and desorption rate constant (kd), Langmuir (monolayer) and Freundlich (multilayer) sorption capacities, and energy (E) of sorption. The ka and kd were determined according to the kinetic model of second order sorption reaching equilibrium, monolayer sorption capacity (b) and energy (E) were determined according to Langmuir isotherm model, and multilayer sorption capacity (B) was determined based on Freundlich isotherm model. Sorption of Zn2+ on purified HD-HA was maximum at pH 5.0. The novel kinetic expression resulted from proposed kinetic model has been shown to be more applicable than the commonly known Lagergren equation obtained from the pseudo-first order sorption model. The application of the equation revealed that the intercept of Lagergren equation, ln qe was more complex function of initial concentration of Zn2+ (a), Langmuir sorption capacity (b), and sorbed Zn2+ at equilibrium (xe).
SYNERGISTIC EXTRACTION OF COBALT(II) WITH MIXTURE OF ACYL-PYRAZOLON AND CROWN-ETHER IN STRONSIUM(II) ENVIRONMENT Rusdiarso, Bambang
Indonesian Journal of Chemistry Vol 7, No 1 (2007)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (768.042 KB) | DOI: 10.22146/ijc.21711

Abstract

Synergistic extraction of cobalt(II) with mixture of acyl-pyrazolon (HL) and crown-ether (E) in the Sr(NO3)2 environment has been studied. In this research, HPMBP (phenyl-1-methyl-3-benzoil-4-pyrazolon-5) was used, with three different kinds of  crown-ether, i.e. (benzo-15-crown-5), DB18C6 (dibenzo-18-crown-6) and DB24C8 (dibenzo-24-crown-8), in chloroform. In the bulk environment  of stronsium,  a cobalt coextraction and stronsium occured with species ESrNO3+,Co(PMBP)3-, and E = B15C5,    while Co(PMBP)2E and ESr,Co(PMBP3)2, with E = DB18C6. There was no  coextraction when using crown-ether DB24C8, with the extracted species Co(PMBP)2E. Values of extraction constant presented in log Kex were -6.08 (B15C5), - 4.51,  -12.55 (DB18C6), and - 4.57 (DB24C8), respectively.   Keywords: synergistic, cobalt (II), strontium (II), coextraction.