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Chem Info
Published by Universitas Diponegoro
CHEMINFO JOURNAL adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan oleh Jurusan Kimia, Fakultas Sains dan Matematika Universitas Diponegoro Semarang. Jurnal ini sebagai media publikasi hasil karya ilmiah lulusan S1 Jurusan Kimia.
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Articles
PENGARUH PENAMBAHAN KITOSAN TERHADAP KARAKTER SEMEN KALSIUM FOSFAT

Kusumawati, Fitria ( Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro )

Chem Info Journal Volume 3, Nomor 1, Tahun 2015
Publisher : Chem Info Journal

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Abstract

Telah dilakukan penelitian tentang pengaruh penambahan kitosan terhadap karakter semen kalsium fosfat. Tujuan dari penelitian ini adalah mengetahui pengaruh penambahan kitosan terahadap setting time, hardening time, struktur kalsium fosfat, kristalinitas dan ukuran bulir kristal pada semen kalsium fosfat. Metode yang digunakan untuk membuat fase powder adalah metode reaksi padatan temperatur tinggi dan untuk membuat semen kalsium fosfat adalah metode reaksi pelarutan. Semen yang dihasilkan selanjutnya dikarakterisasi menggunakan spektroskopi Fourrier Transform Infra Red (FTIR) dan XRay Diffraction (XRD). Hasil penelitian menunjukkan bahwa pengaruh penambahan kitosan terhadap semen kalsium fosfat adalah adanya gugus fungsi fosfat, karbonil dan hidroksil yang muncul bersama gugus fungsi N-H, C-H, dan C-O pada semen kalsium fosfat-kitosan, meningkatkan setting time dan hardening time, tidak menyebabkan perubahan struktur, menurunkan kristalinitas dan ukuran bulir kristal hidroksiapatit dari 58,14 nm menjadi 51,70 nm, eningkatkan kristalinitas dan ukuran bulir kristal α-trikalsium fosfat dari 36,47 nm menjadi 41,96 nm.

PENGARUH PENAMBAHAN KITOSAN TERHADAP KARAKTER SEMEN KALSIUM FOSFAT

Kusumawati, Fitria ( Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro )

Chem Info Journal Volume 3, Nomor 1, Tahun 2015
Publisher : Chem Info Journal

Show Abstract | Original Source | Check in Google Scholar |

Abstract

Telah dilakukan penelitian tentang pengaruh penambahan kitosan terhadap karakter semen kalsium fosfat. Tujuan dari penelitian ini adalah mengetahui pengaruh penambahan kitosan terahadap setting time, hardening time, struktur kalsium fosfat, kristalinitas dan ukuran bulir kristal pada semen kalsium fosfat. Metode yang digunakan untuk membuat fase powder adalah metode reaksi padatan temperatur tinggi dan untuk membuat semen kalsium fosfat adalah metode reaksi pelarutan. Semen yang dihasilkan selanjutnya dikarakterisasi menggunakan spektroskopi Fourrier Transform Infra Red (FTIR) dan XRay Diffraction (XRD). Hasil penelitian menunjukkan bahwa pengaruh penambahan kitosan terhadap semen kalsium fosfat adalah adanya gugus fungsi fosfat, karbonil dan hidroksil yang muncul bersama gugus fungsi N-H, C-H, dan C-O pada semen kalsium fosfat-kitosan, meningkatkan setting time dan hardening time, tidak menyebabkan perubahan struktur, menurunkan kristalinitas dan ukuran bulir kristal hidroksiapatit dari 58,14 nm menjadi 51,70 nm, eningkatkan kristalinitas dan ukuran bulir kristal α-trikalsium fosfat dari 36,47 nm menjadi 41,96 nm.

METODE ELEKTROFOTOKATALISIS DAN FOTOKATALISIS DENGAN TiO2 PADA DEKOLORISASI REMAZOL GOLDEN YELLOW RNL DAN PENURUNAN KONSENTRASI ION LOGAM Cd2+ SECARA SIMULTAN

N.R., Ade Novianti, , M.Si., Drs. Gunawan, Haris, M.Si., Drs. Abdul

Chem Info Journal Vol 1, No 2 (2013)
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Abstract

Experiments on elektrofotokatalisis using TiO2 on decolorization remazol golden yellow RNL and decreased concentrations of Cd2+ metal ion simultaneously have performed. The purpose of this study was to compare the effectiveness of photocatalytic TiO2 in the form of thin layers of powder that was used to electrophotocatalyzed remazol golden yellow RNL and to reduce the concentration of metal ion of Cd2+. The electrophotokatalysis method use TiO2/FTO working electrode and photocatalytic TiO2 powder for 240 minutes. UV-Vis spectrophotometer was used to determine the absorbance decrease of remazol golden yellow RNL, while atomic absorption spectrophotometer (AAS) was used to determine the decrease concentration of metal ion Cd2+. The results obtained in this study for working electrode TiO2/FTO are more effective to decolorize remazol golden yellow RNL and to decrease the concentration of metal ion Cd2+ compared to the use of TiO2 powder. Electrophotokatalysis using TiO2/FTO working electrode was capable to decolorize remazol golden yellow RNL by 87.9% and to lower the concentration of metal ion of Cd2+ by 82.7%, while the photocatalytic method was only able to decolirize remazol golden yellow RNL by 25.87% and to decrease the concentration of metal ion Cd2+ amounted to 53.2%   

Atom, Ion, Molekul dan Interaksinya: Analisis dan Perhitungan Mekanika Kuantum ab Initio

Siahaan, Parsaoran

Chem Info Journal Volume 1, Nomor 1, Tahun 2013
Publisher : Chem Info Journal

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Abstract

The widely explanation of the regularly atomic ionization energy properties by element periodic system, quantum theory and Schrodinger equation is still opened to be developed and explained for understanding the whole inherently properties of the elements and molecules. Developing of  the theory even also enable us to explain the nanoparticle elements properties, or to explain the non-covalent interactions properties of compounds. This developing will have been doing by computation method of quantum theory ab initio which is able to predict every hypotetic atomic, molecule, and its cluster.

METODE ELEKTROFOTOKATALISIS DAN FOTOKATALISIS DENGAN TiO2 PADA DEKOLORISASI ZAT WARNA REMAZOL BLACK B DAN PENURUNAN KONSENTRASI ION LOGAM Cu2+ SECARA SIMULTAN

Herlita, Ita, , M.Si., Drs. Gunawan, Haris, M.Si., Drs. Abdul

Chem Info Journal Vol 1, No 2 (2013)
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Abstract

Has done research on use electrophotocataysis and photocatalysis methods by using TiO2 for decolorize of remazol black B dye and decrease the concentration of Cu2+metal ion simultaneously. This research was carried out by electrophotocatalysis is electrolyzing sample solution using and TiO2/FTO as anoda and C as cathoda at a potential of 3 volts and for the photocatalysis was done by the addition of 0.1685 grams of TiO2 powder in the sample solution. The two methods in the photocatalys reactor were irradiation with UV-C light and mixtured using 4 rpm for 210 minutes. Sample solution were analyzed by UV-Vis and AAS. The results showed that electrophotocatalysis more effective methods to decolorize dye solution of remazol black B and to decrease the concentration of Cu2+metal ion simultaneously. Decolorization percentage of remazol black B dye with electrophotocatalysis and photocatalysis methods were 98.65% and 31,05%, while the decrease percentage of Cu2+ metal ion concentration were 98.25% and 31,50% respectively.

SINTESIS ISOPROPIL SINAMAT DARI SINAMALDEHID PADA MINYAK KAYU MANIS (Cinnamomum cassia) DAN UJI AKTIVITAS SEBAGAI ANTIDIABETES

Anwar, Finalia Femmy, , S.Si., M.Si., Ngadiwiyana, Fachriyah, M.Si, Dra. Enny

Chem Info Journal Vol 1, No 2 (2013)
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Abstract

Has done research on use of synthesis isopropyl cinnamate of cinnamaldehyde in cinnamon oil (Cinnamomum cassia) and test activities as the antidiabetic. The purpose of this study was to isolate cinnamaldehyde of cinnamon oil, synthesis cinnamic acid, cinnamic isopropyl synthesis and test the antidiabetic activity. The method used in this study by using the method of oxidation and esterification through cinnamoil chloride. Analysis of compounds synthesis was using infra red spectrophotometry, gas chromatography-mass pectroscopy. Activity test of anti-diabetic compounds isopropyl cinnamic was with the measurement of inhibition α-glucosidase activity. Cinnamaldehyde which is isolated from cinnamon oil was yellow orange oil and cinnamaldehyde’s yield   1    was up to 76.41% and its purity was 99.87%. Cinnamaldehyde analysis using of infra red spectrophotometer showed carbonyl vibration at 1676 cm-1, C-H aldehyde at 2813.9 cm-1. From mass spectra, it can be known that cinnamaldehyde had M+ 132. Cinnamic acid which is oxidation was a white solid with yield was up to 41,89%. Cinnamic acid analysis using of infra red spectrophotometer showed O-H ad 3433.29 cm-1. Esterification of cinnamic acid chloride sinamoil through using 2-propanol produces brownish yellow liquid with a yield of as much as 84.62% and its purity was 98.43%. Isopropyl cinnamic analysis using of infra red spectrophotometer showed C-O ester at 1165.00 cm-1 and C-O isopropyl at 1111.10 cm-1. From mass spectra, it can be known that isopropyl cinnamic had M+ 190. At concentrations of 74.219 ppm isopropyl cinnamate synthesis results showed activity as antidiabetic of the enzyme that can inhibit α-glucosidase by 96.94% with IC50 value of 45.42 ppm.

Effect of Milling Time on nanostructured Hydroxyapatite Results Synthesis by Precipitation Method

Pratiwi, Sari, Windarti, Tri, Nurhasanah, Iis

Chem Info Journal Vol 1, No 2 (2013)
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Abstract

A study "Effect of Milling Time on Nanostructured Hydroxyapatite Synthesis Results by Precipitation Method" in purpose to know the effect of milling time on purity, phases and size of hydroxyapatite crystals synthesized. Hydroxyapatite (HA) were synthesized by the method of precipitation by adding dropwise a solution of CaCl2 to a solution of KH2PO 4 which has been conditioned at pH 9 with stirring and heated at 40 °C for 4 hours. The resulting suspension was allowed to stand for 20 hours. Product of precipitation milled using a Planetary Ball Mill at 880 rpm angular velocity and the ratio of powder/ballmill 1:10 with milling time variation 0, 5, 15, 30 and 60 minutes. Based on the FTIR and XRD, it was concluded that the HA produced by milling time of 60 minutes has not been able to achieve high purity. Another type of calcium phosphate formed on the product is calcium hydrogen phosphate anhydrous (CHPA). The longer the milling time, the smaller the size of HA crystals. Size of HA crystals are formed on the nanometer scale is 49.85 nm; 38.30 nm; 34.84 nm; 33.44 nm and 30.44 nm.

SINTESIS HIDROKSIAPATIT DARI BATU KAPUR ALAM SECARA MEKANOKIMIA DENGAN VARIASI WAKTU PENGGILINGAN

Riqti, Frederica Thalita, Windarti, Tri, Sutanto, Heri

Chem Info Journal Vol 1, No 2 (2013)
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Abstract

A study entitled synthesis of hydroxyapatite from natural limestone with variations mechanochemical milling time. The purpose of this research was to produce hydroxyapatite and to determine the effect of milling time on the purity, phases, and crystallite size on the synthesis of hydroxyapatite from limestone with mechanochemical method. The principle of this method is that the reaction between solids with the help of mechanical energy. Limestone that has been mashed mixed with powdered KH2PO4, mechanochemical process is then performed with the variation of time 0, 70, 80, 90, and 100 minutes. The resulting products were analyzed with FTIR and XRD and calculated by Scherrer equation to determine the crystallite size. Based on XRD and FTIR result, dominant types of calcium phosphate produced in this research were hydroxyapatite (HA) and tetracalcium phosphate (TTCP). Crystallite size of HA was formed on the time variation of 70, 80, 90, and 100 minutes ie 40.66 nm, 39.03 nm, 36.84 nm, and 39.78 nm.

SINTESIS ZEOLIT DARI LIMBAH AMPAS TEBU VARIASI WAKTU KRISTALISASI DAN RASIO Si/Al

Riang, Alfonsa Juwita, , S.Si, M.Si., Sriatun, , M.Si., Dra. Taslimah

Chem Info Journal Vol 1, No 2 (2013)
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Abstract

Zeolite synthesis from bagasse was done in this research. Bagasse camouflage at 550oC for 4 hours, Silica in bagasse ash was extracted by dissolving in NaOH and heated. Sodium silicate mix with sodium aluminate then placed on a Teflon container and heated in an oven for the crystallization process. The study begins with the crystallization time 1,3,5,7 days with Si/Al ratio 50 and continued with the Si/Al ratio 75, and 100 by using the best of the crystallization time.The heating time of 1 and 3 days produced amorphous while the 5 and 7 days of heating time have resulted Zeolite with the best crystallinity of the zeolite in the 7 days of heating. Increasing of Si/Al ratio showed a decrease in crystallinity. Crystallinity of the zeolite with the best results obtained at the time of crystallization of 7 days with a ratio Si/Al 50. The resulting zeolite is Hydrogen Aluminum Silicate (H4Al2Si2O9), and there are mixture of the Sodium Silicate Hydrate (Na2SiO3.9H2O), Sodium Hydrogen Silicate Hydrate (Na2(H2SiO4).7H2O) with consecutive crystal size 340.29 nm; 362.84 nm; 392.21 nm and the comparison of the composition is 39.6%, 39.2%, 21.16%

PENGARUH METODE PEMANASAN DALAM OVEN DAN REFLUKS PADA SINTESIS ZEOLIT ZSM-5 DARI LIMBAH AMPAS TEBU

., Ngadiyono, ,S.Si, M.Si, Sriatun, ,M.Si, Dra. Taslimah

Chem Info Journal Vol 1, No 2 (2013)
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Abstract

The synthesis of ZSM-5 was done from bagasse waste ash and sodium silicate as source of silica and aluminium hydroxide as source of alumina with use heating method on oven and reflux. The synthesis was done by reacting sodium silicate and sodium aluminate at pH 11-12 until is formed gel. Gel through are taken to caried out heating on oven and reflux at 1100C for 1, 3, 5, dan 7 days. Product which obtained are washed by aquades until pH neutral, through are dried at 1100C for 10 hours.Characterization of product are carried out by Fourrier Transform InfraRed (FTIR) and X-Ray Diffraction (X-RD). Heating use reflux more effective than oven. Optimum result are obtained for heating at 5 days. Diffractogram are obtained showed that mixture of mineral such as Nacrite, Aluminum Silicate Oxide Hydrate, and ZSM-5. Spectrum FTIR showed that heating on reflux at wavenumber 609,51 cm-1 are showed double ring vibration of ZSM-5 framework.