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STUDI KINETIKA REAKSI HETEROGEN α-PINENE MENJADI TERPINEOL DENGAN KATALISATOR ASAM KHLORO ASETAT Utami, Herti; Budiman, Arief; Sutijan, Sutijan; Roto, Roto; Sediawan, Wahyudi Budi
REAKTOR Volume 13, Nomor 4, Desember 2011
Publisher : Dept. of Chemical Engineering, Diponegoro University

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Abstract

KINETIC STUDY OF HETEROGENEOUS HYDRATION OF α-PINENE TO TERPINEOL USING CHLORO ACETIC ACID AS A CATALYST. Indonesian turpentine contains 65-85% α-pinene, 1% camphene, 1-3% β-pinene, 10-18% 3-carene and limonene 1-3%. In order to obtain more valuable products, α-pinene can be hydrated in dilute acid solutions to produce terpineol, which can be used as perfume, insect repellent, antifungal, disinfectant etc. The aim of this research was to study kinetics of terpineol synthesis from α-pinene, the main component of turpentine Turpentine was introduced into a batch reactor (tree neck flask) equipped with condenser, thermometer, stirrer and was warmed up to the desired temperature with the reaction time of 420 minutes. The study investigated the effects of temperature, catalyst amount, and the stirring rate on the hydration of α-pinene. The heterogeneous kinetics model was proposed to quantitavely describe the hydration process of α-pinene. The results of this study showed the relationship of the constants of the reaction rate and temperatures. The equations can be written as follow and . The relative errors were 2.80% and 2.19%, respectively. It was found that the chemical reaction step controlled the hydration process. The results of this study show that the proposed heterogeneous kinetics model can quantitatively describe the hydration of α-pinene using chloro acetic acid as catalyst very well.   Abstrak   Terpentin Indonesia mengandung 65-85% α-pinene, 1% camphene, 1-3% β-pinene, 10-18% 3-carene dan limonene 1-3%. Untuk meningkatkan nilai jual, α-pinene dapat dihidrasi dalam medium asam menjadi terpineol yang dapat digunakan untuk bahan parfum, penangkal serangga, anti jamur,  desinkfektan dll. Penelitian ini bertujuan mempelajari studi kinetika reaksi sintesa terpineol dari α-pinene yang merupakan komponen utama terpentin. Terpentin sebanyak volume tertentu dipanaskan dalam reaktor batch labu leher tiga yang dilengkapi dengan pendingin balik, thermometer dan pengaduk sehingga mencapai suhu tertentu dengan waktu reaksi selama 420 menit. Variabel yang dipelajari adalah suhu, jumlah mol katalis dan kecepatan pengadukan. Model kinetika heterogen diajukan untuk menggambarkan proses hidrasi α-pinene tersebut. Dari hasil perhitungan diperoleh hubungan antara konstanta kecepatan reaksi dengan suhu dapat dinyatakan dengan persamaan berikut dan . Jika dipakai untuk menghitung k1 dan k2 persamaan tersebut memberikan ralat rata-rata sebesar 2,80% dan 2,19%. Reaksi kimia lebih berpengaruh terhadap kecepatan proses hidrasi secara keseluruhan. Dari hasil perhitungan diperoleh bahwa model kinetika reaksi heterogen yang diajukan dapat menggambarkan secara kuantitatif reaksi hidrasi α-pinene dengan katalisator asam khloro asetat.
HYDROTALSIT Zn-Al-EDTA SEBAGAI ADSORBEN UNTUK POLUTAN ION Pb(II) DI LINGKUNGAN Roto, Roto; Indah, Dahlia Rosma; Kuncaka, Agus
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 22, No 2 (2015)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Abstract

Polusi ion Pb(II) di dalam lingkungan perairan cenderung naik seiring peningkatan jumlah industri smelter dan daur ulang aki bekas. Penelitian ini bertujuan untuk menguji kemampuan hidrotalsit Zn-Al-EDTA sebagai adsorben ion Pb(II) dalam air secara mendalam. Hidrotalsit Zn-Al-NO3 disintesis dengan metode kopresipitasi dan hidrotermal pada temperatur 100 °C selama 15 jam. Hidrotalsit Zn-Al-EDTA diperoleh dengan penukaran ion. Keasaman larutan, kinetika dan kapasitas adsorpsi diteliti. Hidrotalsit Zn-Al-EDTA memiliki d003 sebesar 14,52 Å sementara Zn-Al-NO3 sebesar 8,90 Å. Spektra FTIR menunjukkan keberadaan serapan gugus C=O pada bilangan gelombang 1684,77 cm-1. Kondisi optimum adsorpsi ion Pb(II) terjadi pada pH 4, waktu kontak 60 menit dan kapasitas adsorpsi diperoleh 2,07 mg/g pada konsentrasi awal 10 mg/L dengan berat adsorben 0,100 g. Adsorpsi ion Pb(II) oleh hidrotalsit Zn-Al-EDTA mengikuti reaksi pseudo orde dua dengan tetapan laju adsorpsi sebesar 8,90 g mmol-1min-1. Adsorpsi ion Pb(II) oleh Zn-Al-EDTA terjadi karena  pembentukan khelat Pb-EDTA di dalam struktur hidrotalsit. Hasil ini diharapkan mampu memberikan kontribusi yang lebih luas di dalam pengendalian konsentrasi Pb(II) di lingkungan.
APLIKASI PENGOLAHAN POLUTAN ANION KHROM(VI) DENGAN MENGGUNAKAN AGEN PENUKAR ION HYDROTALCIT ZN-AI-SO4 Roto, Roto; Tahir, Iqmal; Sholikhah, Umi Nur
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 16, No 1 (2009)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Abstract

Keberadaan logam khrom di dalam sistem perairan bersifat polutan yang harus ditangani dengan baik, dan untuk khrom (Vl) yang sering dijumpai dalam bentuk anion dapat diolah dengan menggunakan mekanisme pertukaran ion. Suatu agen penukar anion telah dibuat berupa senyawa hidrotalsit Zn-Al-SOa melalui proses sintesis, karakterisasi serta dilakukan pula pengujian aplikasinya untuk pengurangan polutant anion khrom (VI) dalam bentuk ion dikromat. Sintesis hidrotalsit Zn-Al-SOa dilakukan dengan metode stoikiometri pada pH 8 dan perlakuan hidrotermal. Aplikasi pertukaran dikromat dengan anion sulfat dalam antar lapis hidrotalsit serta uji regenerasi bahan diamati dengan bantuan analisis struktur dan analisis kinetika reaksi pertukaran. Produk pertukaran ion dikarakterisasi dengan XRD, spektrofotometri IR dan spektrometri serapan atom. Rumus kimia hidrotalsit produk diketahui adalah Zn0,74Al0,26(OH)1,74(SO4)0,13.0,52H2O. Anion dikromat dapat menukar sulfat dalam antarlapis hidrotalsit yang ditunjukkan dalam spektra IR dan pola XRD. Kapasitas pertukaran anion untuk dikromat diketahui 216,84 mek/100 g, sedangkan kinetika reaksi pertukaran ion mengikuti orde dua dengan k = 3 x 10-8 ppm-1.detik-1. Hasil menunjukkan Zn-Al-Cr2O7 dapat mudah diregenerasi. 
ANALISIS DAN PENGUKURAN PARAMETER REAKTOR KARTINI UNTUK PENERAPAN METODE K0-NAA Murniasih, Sri; Roto, Roto; Taftazani, Agus; M., Th. Rina; Sutisna, Sutisna
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 16, No 2 (2014): Juni 2014
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

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Abstract

Metode k0-NAA merupakan metode analisis yang banyak digunakan dengan berbagai keunggulan. Dalam penerapan metode k0-NAA diperlukan nilai parameter reaktor (f dan α), maka tujuan penelitian ini adalah akan dilakukan pengukuran nilai parameter f dan α di fasilitas Lazy Susan reaktor Kartini. Metode yang digunakan meliputi metode Cd-ratio dan triple bare. Telah diukur nilai parameter tersebut pada tiga lubang iradiasi di fasilitas Lazy Susan. Diperoleh perbedaan hasil pengukuran nilai parameter yang signifikan pada setiap lubang iradiasi, nilai ƒ berkisar 13,713 - 22,128 dan α berkisar -0,060 – 0,068. Hasil pengukuran f dan α dengan metode Cd-ratio, memberikan nilai yang lebih stabil dibandingkan metode triple bare. Nilai f dan α yang diperoleh dapat dijadikan basis data pada penerapan metode k0-NAA untuk analisis sampel di laboratorium AAN – PSTA.Kata kunci: parameter reaktor, reaktor Kartini, k0-NAA, fluks neutron  The k0-NAA method is an analysis method that widely used by many of the advantages. In the application of k0-NAA method needed valuea of reactor parameters (f and α), then the purpose of the research would be conducted meaasurement parameter values f and α in the Lazy Susan Kartini reactor facilities. The methods used include Cd-ratio and triple bare methods. The parameter value has been measured in three channels in the irradiation facilities Lazy Susan. Differences of measurement results obtained parameter values are significant in each channel irradiation, the value of ƒ ranged from 13.713 to 22.128 and the value of α ranged from -0.060 – 0.068. The results of measurements for the f and α with the Cd-ratio method, providing more stable value than the triple bare method. The value of f and α obtained can be used a database for the application of k0-NAA method for sample analysis in the laboratory NAA – CAST. Keywords: reactor parameter, Kartini reactor, k0-NAA, neutron flux
ANALITICAL METHOD VALIDATION OF ANIONIC SURFACTANT SODIUM DODECYL BENZENE SULFONATE (SDBS) IN CATFISH BY UV-VIS SPECTROPHOTOMETRY USING ACRIDINE ORANGE Ratri, Monica Cahyaning; Suratman, Adhitasari; Roto, Roto
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 2 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

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The analytical method development on an anionic surfactant of sodium dodecylbenzenesulfonate (SDBS) in a catfish using spectrophotometer UV-Vis using acridine orange (AO) has been conducted. This research aims to determine the optimum conditions of analysis and to determine validation parameters of sodium dodecylbenzenesulfonate (SDBS) analysis in a catfish. This study was divided into two steps, isolation of sodium dodecyl benzene sulfonate (SDBS) in the catfish with soxhlet extraction and the analysis of SDBS. The analysis of sodium dodecylbenzenesulfonate (SDBS) is based on the formation of ion pair between dodecylbenzenesulfonate (DBS) and acridine orange (AO). The results showed that the analysis can be performed at 499 nm, using ethanol as acridine orange (AO) solvent, the mole ratio of dodecylbenzenesulfonate (DBS) acridine orange (AO) 2:1, and pH 2.97. The parameters of validation had good acceptability as linearity (r) 0.998, limit of detection 0.0343 mg/L   and limit of quantification 0.104 mg/L, precision 0.382 - 1.78 %, sensitivity 4.64 x 104 L mol-1cm-1, and accuracy (82.11 - 100.3 %).
Saccharin Extraction And Analysis Of Drug And Food Samples By Derivative Ultraviolet (Uv) Spectrophotometry Hermanto, Sarwendah Ratnawati; Roto, Roto; Kuncaka, Agus
Eksakta: Jurnal Ilmu-Ilmu MIPA VOLUME 18, ISSUE 2, August 2018
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Saccharin extraction and analysis of drug and food samples was investegated by spectrophotometry ultraviolet (uv) derivative method were studied. The saccharin extraction was carried out using solvent of ethanol/chloroform (2:8 v/v). The limit of detection (LOD) and limit of quantification (LOQ) of the proposed method were  0.50 ppm and 1.82 ppm for the second order and 0.47 ppm and 1.58 ppm for the fourth, while for the zero order were 2,75 ppm and 8,55 ppm. The calibration curve was linear in the concentration range from 20-100 ppm (R2= 0.996 for the second order and R2=0.997 for the fourth). The percent recovery of saccharin was in the range 95.20-104.40% for the second order and 97.20-102.40% for the fourth. The range of saccharin concentration (w/w) in drugs, candies and toothpaste for the fourth derivative were 1.39±0.02 mg/kg until 7.15±0.05 mg/kg, 0.21±0.01 mg/kg until 2.09±0.01 mg/kg, and 0.15±0.03 mg/kg until 0.63±0.04 mg/kg, respectively.
Characterization of Butanediol-Alginate Ester as Candidate of Hemodialysis Membrane Amri, Choirul; Mudasir, Mudasir; Siswanta, Dwi; Roto, Roto
Indonesian Journal of Chemistry Vol 15, No 2 (2015)
Publisher : Universitas Gadjah Mada

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An ester of butanediol-alginate has been studied as a possible hemodialysis membrane. With 1,4-butanediol molar ratio of 0.1, 0.5, and 1.0, it showed that the membrane mechanical properties, stability, protein adsorption, platelet adhesion and performance for urea and creatinine clearance are better than that of unmodified alginate. The increase in 1,4-butanediol molar ratio causes hemodialysis ratio to improve, and causes protein adsorption and platelet adhesion at the membrane surface to decrease. In the case of protein adsorption and platelet adhesion, the membrane with the molar ratio of 1.0 has better hemocompatibility properties. In the hemodialysis test for 4 h, using 2.742 mg cm-2 h-1 of urea and 0.058 mg cm-2 h-1 of creatinine flux, this membrane showed that 48.5% of urea and 44.2% of creatinine were cleaned.
EXTRACTION AND SPECIATION OF CHROMIUM(VI) AND CHROMIUM(III) AS ION-ASSOCIATION COMPLEXES OF TETRAMETHYLAMMONIUM-CHROMATE Wandoyo, Valencia Widiyaningrum; Mudasir, Mudasir; Roto, Roto
Indonesian Journal of Chemistry Vol 6, No 2 (2006)
Publisher : Universitas Gadjah Mada

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A specific, selective and simple method for speciation of chromium(VI) and chromium(III) has been developed. This method is based on the quantitative extraction of chromium(VI) and chromium(III) as an ion association of tetramethylammonium-chromate in methyl isobutyl ketone (MIBK), followed by back extraction and preconcentration with an acidic diphenylcarbazide (DPC) solution. Back extraction was applied to achieve further preconcentration by a final factor of 20. The chromium(VI)-DPC complex was determined by a UV-Visible spectrophotometer. The optimum conditions of this method are as follows, optimum wavelength at 545 nm, MIBK as organic solvent, 7.5 mL of nitric acid (65%) for each 100 mL sample, mole ratio of TMAC to Cr(VI) of 2x104:1, 5 min shaking time, mole ratio of DPC to chromium(VI) of 8:1, and immediate UV-Vis measurement after obtaining of back-extract. The calibration curve was linear in the concentration range 0.00-0.40 µg.mL-1 of chromium(VI) with a regression equation of Abs=0.0038+1.7427x, in which x was the chromium species concentration ( µg.mL-1). The correlation coefficient (r) for the curve was 0.9991 and the detection limit was found to be 0.946 µg.mL-1. The result of analysis and speciation of chromium in water samples from a river near a leather processing plant in Yogyakarta area showed that the total content of chromium was in the range of 0.04 - 0.05 µg.mL-1 consisting of 0.03 - 0.04 µg.mL-1 of chromium(VI) and 0.002 - 0.01 µg.mL-1 of chromium(III). This result indicates that the concentration of chromium in the river is still below the safety limit.   Keywords: extraction, speciation, chromium, preconcentration, ion-association, tetramethylammonium
IMMOBILIZATION OF Saccharomycess cereviceae BIOMASS ON CHITOSAN AND ITS APPLICATION AS AN ADSORBENT FOR Pb(II) ION Hasri, Hasri; Mudasir, Mudasir; Aprilita, Nurul Hidayat; Roto, Roto
Indonesian Journal of Chemistry Vol 11, No 2 (2011)
Publisher : Universitas Gadjah Mada

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An application of Saccharomycess cereviceae biomass immobilized on chitosan (SC-Chi adsorbent) for Pb(II) ion removal was demonstrated. Adsorption experiment was conducted at various mass ratio of Saccharomycess cereviceae biomass to chitosan, contact time, pH of solution and concentration of cation. Total Pb(II) metal ion adsorbed was calculated from the difference of the amount of metal ion before and after adsorption which was measured by AAS. The results showed that optimum condition for adsorption of Pb(II) ion by the SC-Chi was achieved using mass ratio of Saccharomycess cereviceae to chitosan of 50% (w/w), pH solution of 7, contact time of 60 min and concentration of 25 mgL-1. The hydroxyl (-OH) and amino (-NH2) functional groups are believed to be responsible for the adsorption of Pb(II) ion by the adsorbent.
Zn-Al LAYERED DOUBLE HYDROXIDE AS HOST MATERIAL FOR SUNSCREEN COMPOUND OF p-AMINOBENZOIC ACID Roto, Roto; Tahir, Iqmal; Mustofa, Mustofa
Indonesian Journal of Chemistry Vol 7, No 1 (2007)
Publisher : Universitas Gadjah Mada

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Zn-Al layered double hydroxide can be used as host material for UV active compound p-aminobenzoic acid (PABA), which is having capability to block UV light of sunlight. The formation of Zn-Al-PABA was best developed in which the nucleation process was done at room temperature and followed by hydrothermal treatment at 100 oC.   To make a better product, the molar ratio of Zn to Al to PABA was adjusted to 3:1:1. From the elemental analysis and the content of PABA, it was observed that the product has structural formula of Zn0,745Al0.254(OH)1.650(PABA)0.349. 0.684H2O. The particle size of the powder as estimated using SEM was in the range 100-200 nm. FTIR and XRD proved that the p-amino benzoate ion occupied the interlayer space. This material is expected to have high sun protection factor (SPF).   Keywords: layered double hydroxide, sunscreen, p-amino benzoic acid, nanoparticle