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Alchemy Jurnal Penelitian Kimia
Published by Universitas Sebelas Maret
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Environmental Science Materials Science & Nanotechnology
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Articles 10 Documents
 1 
Search results for , issue " Vol 10, No 1 (2014)" : 10 Documents clear
SYNTHESIS AND CHARACTERIZATION OF C-HEXYL CALIX[4]RESORCINARENA FROM RESORCINOL-HEPTANAL CONDENSATION Handayani, Desi Suci; Almaqqomul Amin, Zainal Arifin; Kusumaningsih, Triana; Masykur, Abu
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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Synthesis of C-hexyl calix[4]resorcinarene through condensation reaction between resorcinol and heptanal with HCl catalyst has been investigated. Synthesis conducted by the ratio of resorcinol: heptanal (1:1) using reflux for 6 hours in ethanol. Structural analysis of the product was done by FTIR and 1H-NMR spectroscopy, while the characterization was done by determining melting point. The product was golden brown powder with a yield 99.43% and melting point more than 300 °C. Structural analysis with FTIR and 1H-NMR known vibration and signals characteristic of calix[4]resorcinarena group,the vibrations of the CH bridge. Vibration of CH bridge appearance at wave number 1445 cm-1 and 1456 cm-1, while signal of CH bridge appearance at chemical shifts from 4.17 to 4.21 ppm.
OPTIMIZING OF TiO2 SEPARATION FROM BANGKA ILMENITE BY LEACHING PROCESS USING HCl Wahyuningsih, Sayekti; Hidayatullah, Hari; Pramono, Edi; Rahardjo, Sentot Budi; Ramelan, Ari Handono; Firdiyono, Florentinus; Sulistiyono, Eko
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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Separation of titanium dioxide (TiO2) from ilmenite Bangka has been done byleaching processusing HCl. Before the leaching process, ilmenite was roastedat 900oC for pre-oxidation (preliminary - oxidation). Leaching process carried out by variation of HCl concentration and Fe0reducing agents. While the re-deposition of dissolved Ti4 +ionachieved by hydrolysis - condensation using 2- propanol - H2O solvents.Leaching the pre-oxidazed ilmenite shows the phase change of  pseudobrokite (Fe2TiO5 ) into hematite ( Fe2O3) and synthetic rutile ( TiO2 ). Formation of the synthetic rutile was characterized by the loss of intensity of Fe2TiO5 at 26.65 º and the increasing intensity of rutile TiO2 at 27.49 º.The dissolution rate of both titanium and iron wasfound to be increased, generally, by increasing acid concentration in case of HCl as well as by increasing ilmenite:Fe0 ratio. Precipitation ofthe dissolved titania with 2-propanol -H2Oof 8:2(v /v) produced anataseTiO2 due to the hydrolysis and condensation of Ti-tetraisopropoxide complexes.
BIOSYNTHESIS OF BIOSURFACTANT BY PSEUDOMONAS AERUGINOSA USING CASSAVA FLOUR INDUSTRIAL WASTEWATER AS MEDIA Suryanti, Venty; Hastuti, Sri; Handayani, Desi Suci; Windrawati, Windrawati
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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Biosynthesis of biosurfactant by Pseudomonas aeruginosa have been prepared using cassava flour industrial wastewater (manipueira) as medium. The optimum condition of the biosurfactans biosynthesis was obtained using media containing nutrient broth and manipueira without centrifugation (NBM) with 4 days fermentation. UV-Vis and FT-IR spectra indicated that the biosurfactant was a rhamnolipid containing hydroxyl, ester, carbocylic and aliphatic carbon chain functional groups. Biosurfactant exhibited critical micelle concentration (CMC) value of 576  mg/L and surface tension value of 0.045  N/m. The biosurfactant was able to decrease the interface tension and form emulsion with benzene, toluene, gasoline and palm oil. This biosurfactant showed w/o emulsion system.
PROCESS TECHNOLOGY OF FABRICATION NO2 GAS SENSOR DEVICES WITH ACTIVE LAYER In2O3 Widodo, Slamet
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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This paper discuss the design and fabrication of NO2 gas sensor based on metal oxide using thick film technology was described. The design of gas sensor is consisted of components, i.e. heater, electrode (interdigital fingers) and sensitive layer from In2O3 material. This sensor has been designed as multilayers with heater and both electrodes in one surface , in accordance with miniaturisation aspect, heat distribution and less consumption of energy from the sensor device. The heater and electrode were fabricated on alumina substrate (aluminum oxide/Al2O3) with silver paste. The In2O3layer provides resistance change when it is exposed by NO2 gas. It indicates that this sensor device has a potency to be used as NO2 detector.
THE EFFECT OF CHLORO ACETIC ACID CONCENTRATION AND TEMPERATURE REACTION OF CARBOXYMETHYL CHITOSAN FORMATION ON CATION EXCHANGE CAPACITY AND THERMAL STABILITY Purnawan, Candra; Pramono, Edi; Purwanto, Purwanto; Martini, Tri; Haryati, Thita
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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The research on the effect of chloro acetic concentration and temperature reaction of carboxymethyl chitosan formation on cation exchange capacity and thermal stability of polymer have been done. Carboxymethyl chitosan was synthesized by reaction of chitosan and chloro acetic acid with NaOH as catalyst. Polymer was characterized by Fourier Transform Infrared Spectrofotometer, cation exchange capacity test, and thermal analysis with thermogravimetric method. Carboxymethyl chitosan has strong FTIR adsorption of carboxyl group (-COO-) in 1606,70 cm-1 and 1444,68 cm-1. The increasing of chloro acetic acid concentration and reaction temperature decreased cation exchage capacity and changed thermal stability of polymer.
ISOLATION AND IDENTIFICATION OF β-SITOSTEROL AND STIGMASTEROL MIXTURE FROM ROOT BARK OF SLATRI (Calophyllum soulattri Burm. f) Saputra, Doni Eko; Handayani, Nestri; Wartono, Muhammad Widyo
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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Chemical isolation and identification of root bark of Calophyllum soulattri Burm. f. have been conducted. Isolation was conducted by maceration with ethyl acetate as solvent. Ethyl acetate extract was separated and purified by vacuum liquid chromatography and flash chromatography which was guided by thin layer chromatography to obtain yellowish white solid. Isolated compounds were determined by spectroscopy methods such as UV, FTIR, 1H NMR, 13C NMR, DEPT, HSQC, HMBC and were compared to the references. Based on the analysis result it’s known that the compounds are the mixture of β-sitosterol and stigmasterol.
BATCH INJECTION POTENTIOMETRY ASAM ASPARTAT, ASAM GLUTAMAT DAN ARGININ MENGGUNAKAN ELEKTRODA TUNGSTEN OKSIDA Muflihah, Yeni Maulidah; Masruroh, Heny; Zulfikar, Zulfikar
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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The presence of aspartic acid, glutamic acid and arginine in solution can be detected by potentiometric method using tungsten oxide electrode in a batch system. Characterization of tungsten oxide electrode used include linear range, limit of detection, sensitivity and reproducibility. Buffer type and concentration effect also studied to optimize the measurement results. Optimum conditions for detecting arginine was at pH 6.0 with a phosphate buffer concentration of 0.5 x 10-3 M. Correlation coefficient was obtained for 0.9864, the detection limit of 5.24 x 10-6 M, sensitivity 16.1 mV/decade with reproducibility 0 –7 %. Glutamic acid has a correlation coefficient of 0.9789, the detection limit of 3.80 x 10-6 M, the sensitivity of 9.2 mV/decade and reproducibility of 0 – 6 %. Aspartic acid has a correlation coefficient of 0.9949, the detection limit of 7.76 x 10-6 M, sensitivity of 13.4 mV/decade and reproducibility of 0 – 5 %.
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)
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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
HDO REACTION OF THF USING Pt/-AL2O3 CATALYST ENRICHED BY ALUMINA : EFFECT OF TEMPERATURE TO PRODUCT DISTRIBUTION, RATE OF REACTION AND DEACTIVATON OF CATALYST Hidayat, Yuniawan; Nurcahyo, IF.; Sofiana, Ana; Saputro, Arifin Dwi
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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Effect of temperature variation to product distribution, rate and deactivation of catalyst of tetrahydrifuran hydrodeoxygenation have been conducted using Pt/-Al2O3 with aluminum enrichmen. Reaction was conducted by flow system. Product of reaction were analyzed as propane (C3) and buthene derivate (C4). At 350 oC, 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.
UTILIZATION OF α-KERATIN OF CHICKEN FEATHERS AS ADSORBEN OF LEAD ION Latifah, Rais Nur; Ernia, Roro; Lisdiana, Anisya; Yulianto, Erick Rian; Asrilya, Nur Jannah; Rosalia, Ayuni Dita; Mustofa, Rosid Eka; Pramono, Edi
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
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Research of Pb ions adsorption with chicken feathers adsorbent has been conducted. This research aims to determine adsorption properties of activated chicken feathers and the chicken feathers that were not activated by Na2S for Pb ions. The adsorption process was conducted by batch method with variation of the concentration, pH, and contact time. Pb content in solution is characterized by AAS spectroscopy (Atomic Absorption Spectroscopy). The results show that the contact time and pH condition for adsorption equilibrium are 60 min for activated chicken feathers and 90 min for chicken feathers which were not activated by Na2S at pH 8. Pb absorption by chicken feathers followsFreundlich isotherm and the reaction kinetics follow the Ho equation.

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