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Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Kampus Universitas Andalas Limau Manih Padang 25163
Location
Kota padang,
Sumatera barat
INDONESIA
Jurnal Riset Kimia
Published by Universitas Andalas
ISSN : 1978628X     EISSN : 24768960     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 551 Documents
 36   37   38   39   40 
KAJIAN AWAL PENGARUH WAKTU REAKSI DAN RASIO MOLAR ASAM OLEAT DENGAN BUTANOL TERHADAP SIFAT FISIKO KIMIA PLASTISIZER BUTIL OLEAT Mers Selly; Nirwana -
Jurnal Riset Kimia Vol. 7 No. 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.176

Abstract

Vol 7 No 2ABSTRACTEsterification reaction is a reaction between fatty acids or carboxylic acids with alcohols toesters. Fatty acid (oleic acid) sourced from palm oil. One alternative to increase the economicvalue of palm oil is oleic acid esterification into oleic butyl known as plasticizers. Plasticizeradditives are compounds added to polymers to improve its flexibility and workabilitas. Thisstudy aims to study the effect of reaction time and molar ratio of the plasticizer synthesis oleicbutyl and identify the plasticizer oleic butyl. In this study, the first step is preparation H-Zeolitecatalyst, then synthesis of plasticizer butyl oleic esterification using natural zeolite catalystswere activated to H-zeolites with variables in the reaction time (6, 9 and 12 hours) and themolar ratio of oleic acid and butanol (1: 6, 1: 9 and 1:12) with the permanent variable stirringspeed of 200 rpm, 108-112 ° C of temperature and the catalyst were 15% oleic acid-based. Fromthe test results obtained 0.862 specific gravity, viscosity of 8.39 mPa and showed that thespecific gravity and viscosity of the resulting plasticizer has commercial plasticizer standardnamely 0.862 to 0.928 and from 8.2 to 9.4. Optimal operating conditions obtained in thisresearch is the molar ratio of 1:12, reaction time 12 hours resulted in a conversion reaction of76.73%.Keywords: Esterifikasi, H-zeolite, Oil, Plasticizer
PEMURNIAN CATECHIN DARI GAMBIR KOTO PANJANG, PESISIR SELATAN Norman Ferdinal
Jurnal Riset Kimia Vol. 5 No. 1 (2011): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i1.177

Abstract

Vol 5 No 1ABSTRACT The research about catechin purification from gambier was purposed to find its solubility properties in various solvent such as in cold water, hot water, hexane, ethyl acetate, and methanol. By knowing its solubility properties, the easiest way to purify the catechin could be gotten which is yielding about 7.33%. Further, the molecular structure has been gotten by determining its melting point and using spectrophotometric measurements such as UV, IR, 1H NMR, 13C NMR. Based on those measurements, d-cathecin structure with a melting point of 175 - 177 ºC was founded. The expected benefit from this research is it could be benefiting the development of gambier purification industry in order to enhancing added value of West Sumatera’s commodities. It would make Western Sumatera gaining stronger bargaining position due to the capability on selling not only on the crude form to abroad. The result of this research has indicated that catechin purification can be performed using an organic solvent and water.  Keywords: Purification, catechin, gambier
DEGRADASI RHODAMIN B SECARA FOTOKATALISIS DAN OZONOLISIS DENGAN PENAMBAHAN TIO2-NIFE2O4, TiO2-CuFe2O4, DAN TiO2-MnFe2O4 Safni -; Deliza -; Rahmayeni -
Jurnal Riset Kimia Vol. 7 No. 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.178

Abstract

Vol 7 No 2ABSTRACTDegradation of Rhodamin B has been done by photocatalytic and ozonolysis using TiO2-Anatase and TiO2-NiFe2O4, TiO2-CuFe2O4, TiO2-MnFe2O4 catalysts, photocatalytic methodused lamp with λ = 365 nm and ozonolysis methode used ozon reactor. Analysis of degradationresult used spectrofotometer UV-Vis. TiO2-NiFe2O4, TiO2-CuFe2O4, TiO2-MnFe2O4 catalystwere characterized by XRD to determine size and structure of crystal. The solution ofRhodamin-B 2 mg/L was degraded 93,33 % without catalyst after being photolysed for 180minutes and after adding 0,02 g TiO2-MnFe2O4, TiO2-CuFe2O4, TiO2-Anatase, TiO2-NiFe2O4catalyst. The additional consentration in a row are 99,55 %; 99,77 %; 100 %; 100 %. Thesolution of Rhodamin B 2 mg/L was degraded 99,33% without catalyst after being ozonolysisfor 25 minutes and after adding 0,02 g of TiO2- MnFe2O4, TiO2-CuFe2O4, TiO2-Anatase, TiO2-NiFe2O4 catalysts with the additional consentration in a row are 99,77 %, 99,77 %, 99,77 %,100 %. So the degradation of Rhodamin B using ozonolysis method was faster thanphotocatalytic with catalysts and without catalyst.Keywords: Rhodamin B, Photocatalytic, Ozonolysis, TiO2-Anatase, TiO2-NiFe2O4, TiO2-CuFe2O4,TiO2-MnFe2O4.
DIP-COATING SENYAWA KALSIUM FOSFAT DARI BATU KAPUR BUKIT TUI MELALUI METODE SOL-GEL Novesar Jamarun; Lia Anggresani; Syukri Arief
Jurnal Riset Kimia Vol. 5 No. 1 (2011): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i1.179

Abstract

 ABSTRACT Preparation of Dip-Coating Calcium Phosphate via sol-gel method using natural limestone Bukit Tui as calcium precursors and diammonium hydrogen phosphate as phosphorus precursors with sol-gel process has been investigated. Ethanol was used as solvent and DEA (diethanolamine) was used stabilizing agent. The powder were prepared by calcinated the sol at 950 oC. The products were characterized by Fourier Transform Infra Red, X-Ray Diffraction and Scanning Electron Microscopy. FTIR results showed that the vibration form was PO43-, P2O74-, O-H and CO2. XRD patterns of powder with various Ca/P mol ratio showed that the product of calcium phosphate was Ca2P2O7 and also found the hydroxyapatite Ca10(PO4)6(OH)2 in Ca/P mol ratio 1,7. SEM images of powder calcium phosphate revealed that their morphology were spheric and homogen. The coating process was done at glass substrate with coating speed 20 cm/min by calcinations at 400 oC. XRD patterns of thin layer showed that the product was Ca2P2O7 and SEM images of thin layer revealed that their morphology were bulk. Keywords: Natural limestone, calcium phosphate, hydroxyapatite, sol-gel, dip-coating
PEMBUATAN PASTA DAN PEMBENTUKAN LAPISAN TIPIS HIDROKSI APATIT KARBONAT Selfa Dewati Samah; Syukri Arief; Novesar Jamarun
Jurnal Riset Kimia Vol. 7 No. 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.180

Abstract

 ABSTRACTPaste of Carbonated Hydroxyapatite (CHA) as a biocompatible material that can be used in thebone and teeth repair has been developed on preparation of thick film. CHA paste was preparedby mixing precipitate of CHA with CaSO4 and polyethylene glycol (PEG) in 2-propanol assolvent. Paste was deposited on substrate to get thick films by screen printing method. X raydiffraction (XRD) analysis has shown hexagonal crystal structure and crystal size of CHAacquired 7,2 nm by Scherrer’s method. Fourier Transform Infrared (FTIR) analysis has shownabsorption spectra which indicating phosphate, carbonate, and hydroxide group. Size of thiscomposite particles analyzed by PSA (particle size analyzer) about 3μm and pore size was 0.44-0.49 nm obtained from BET analysis, increased with the addition of CaSO4 (0.44 to 0,49 nm).Rephrase PEG was found as an adhesive and homogenize paste on substrat surface. In addition,CHA paste also potentially can be used as bone cement.Keywords : Paste, thick film, carbonated hydroxyapatite
TRANSPOR IODIN MELALUI MEMBRAN KLOROFORM DENGAN TENIK MEMBRAN CAIR FASA RUAH Refinel -; Zaharasmi Kahar; Sukmawita -
Jurnal Riset Kimia Vol. 5 No. 1 (2011): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i1.181

Abstract

 Vol 5 No 1ABSTRACT The transport of iodine through a bulk liquid membrane containing chloroform as the solvent and alkaline sodium sulfite solution as the receiving phase was studied .Iodine transport was performed by bulk liquid membrane technique consist of 10 mL I2/KI solution as feed phase, Na2SO3 (20 mL) and NaOH solution as receiving phase, and chloroform (30 mL) as membrane phase which was stirred 100 rpm. The presence of iodine both in feed and receiving phase then where determined by Spectrophotometer UV-Vis with λ max at 567 nm. The optimum conditions for iodine transport investigated from this work are 4x10-3 N, pH 4 in feed phase, pH 9 in receiving phase, I2 : KI ratio in feed phase (2 : 5), and a stirring duration is 180 minutes. As conclusion the bulk liquid membrane technique with Na2SO3 and NaOH as receiving and acception substances is potential for iodine transport resulting 78.6 % of iodin transport. Keywords: Iodine, transport, chloroform, bulk liquid membrane, Na2SO3, NaOH
ADSORPSI ZAT WARNA BIRU METILENA OLEH LEMPUNG BENTONIT AKTIF Susilawati -
Jurnal Riset Kimia Vol. 7 No. 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.182

Abstract

 ABSTRACTStudy on bentonite adsorbent properties such as benthonite optimum activation condition, afectof sulfic acid consentration, activation temperature and activation time to decolorization ofmethilne Blue has been conducted. The study was started by activation of bentonite uponmethylene blue. The data was analysis by statistical method : Least Significant Difference (LSDor BNT). It is found that the mass of bentonite significantly effected (P < 0,01) on thedecolorization percentage of methylene blue. The optimum condition of adsorbtion showed thatthe concentration of activating agent (sulfic acid) was 20%, activation temperature at 110o C andactivation time was 30 minutes. On this optimum condition, the bentonite absorbed methyleneblue up to 93.30% .Keywords: Bentonite, Methylene Blue, Activation, Decolorization
PERUBAHAN KOMPOSISI METIL ESTER AKIBAT KERUSAKAN PANAS PADA METIL ESTER SULFONAT DARI JARAK PAGAR Sri Hidayati
Jurnal Riset Kimia Vol. 5 No. 1 (2011): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i1.183

Abstract

Vol 5 No 1ABSTRACT Surfactant is a surface-active agent that can be produced by a chemical or biochemical synthesis. The most widely used anionic surfactant in surfactant flooding is linier alkyl benzene sulfonate (LAS) synthesized from petroleum material. The weaknesses of petroleum based surfactant are: it is made from nonrenewable resources, has very poor detergency in hard water and naturally are difficult to be degraded. These problems can be overcome by producing methyl ester sulfonate (MES) surfactant made from natural resources, such jatropha oil es methyl ester. Temperature is the important factor that should be performed in MES stability. The purpose of this research is to investigate the sulfonate group caused by temperature and degradation time. The result of thermal degradation tests of Methyl Ester Sulfonates showed that at temperature of 150 oC during 72 hours influenced the degradation of sulfonate group. It was indicated by decreasing peak of sulfonate formed at the wave number of 1250 – 1150 cm-1. The increased of temperature showed decreased ability of surfactant to stabilized of emulsion and surface tension. Keywords: methyl ester sulfonates, thermal degradation
SYNTHESIS AND CHARACTERIZATION OF MODIFIED MESOPOROUS SILICA-IMOBILIZED Cu(II)-ACETONITRILE COMPLEX AND ITS APPLICATION IN TRANSESTERIFICATION OF FRYING OIL Syukri -; Rycce Sylviana Pratikha; Novesar Jamarun
Jurnal Riset Kimia Vol. 7 No. 2 (2014): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v7i2.184

Abstract

 ABSTRACTMesoporous silica has attracted rapidly growing attention in catalysis. In this work, mesoporoussilica was synthesized by using CTAB surfactant and then modified by AlCl3. Such materialwas used as support for Cu(II)--acetonitile complex and applied in transesterification of fryingoil. The XRD pattern of the obtained silica confirms the availability of chracteristic peak onsilica surface while its TEM exhibits the uniformity of nanochannel of the mesoporous silica.The particle size of silica support has become smaller after grafting process showed by SEMimages. FT-IR spectra of the materials indicated that the Cu(II) grafted on the mesoporoussilica was in the form of its acetonitrile complex. Supprisingly, the Cu loading the graftedcatalyst was found to be very high. That was 21%, when the catalyst applied ontransesterification of the examined frying oil the amount of total methyl ester yielded were of65%.Keywords: mesoporous silica, AlCl3, Cu(II)-acetonitrile complex, transesterification
PENGARUH TEMPERATUR DAN KONSENTRASI KATALIS PADA CRACKING CANGKANG SAWIT MENJADI CRUDE BIO-FUEL Sunarno -; Silvia R.Y; Syaiful Bahri
Jurnal Riset Kimia Vol. 5 No. 1 (2011): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i1.185

Abstract

 ABSTRACT One of solid waste that produced by palm industry is palm oil shell. This waste abundant in Riau about 700.5 ton/day. The shell compositions are cellulosa, hemicellulosa, and lignine. That compounds can be cracked into crude biofuel in slurry reactor with NiMo/ZSM-5 catalyst. The objective of research to study the influence of cracking temperature (300, 310, 320, 330 0C) and concentration of catalyst (0.5; 1.5; 2.5; 3.5%) to yield of crude biofuel and to determine physical and chemical properties. Cracking process used 50 gram palm oil shell size -40+60 mesh, 500 mL silinap and rotation speed of mixing 300 rpm. The maximum yield was obtained 68.6% at temperature 330 0C and catalyst concentration NiMo/ZSM-5 2.5%. The physical properties of crude biofuel were calorimetric value (43.84 MJ/kg), density (1.01 g/mL), viscocity (13.27cSt), acid number (76.11 g NaOH/g sample) and flash point (64 0C). The GC-MS analysis result indicated dominant compounds in crude biofuel were acetic acid (33.94%), phenol (31.71%), furancarboxaldehide (7.78%) and methanol (4.93%). Key words : Catalyst, crude biofuel, palm oil shell 

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