Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Jurnal Zeolit Indonesia Chimica et Natura Acta Makara Journal of Science
Diana Rakhmawaty
dosen
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science Materials Science & Nanotechnology

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
PHOTOCATALYTIC PRODUCTION OF TiO2-NATURAL ZEOLITE FROM TASIKMALAYA FOR PHOTODEGRADATION OF METHYLENE BLUE A., Arfan Sani; N., Atiek Rostika; Rakhmawaty, Diana
Jurnal Zeolit Indonesia Vol 8, No 1 (2009)
Publisher : Jurnal Zeolit Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (389.252 KB)

Abstract

Photocatalyst is reaction process of one materials to another materials which aided by energy from ultraviolet radiation and solid catalyst. The study conducted by making a catalyst based on variation concentrates from natural zeolite Cikalong-Tasikmalaya with addition of TiO2. The test of photocatalytic activity was conducted on methylene blue. The purpose this study to obtain a new photocatalytic is modified of natural zeolite with TiO2 which expected had a high reactivity so able to used on waste fluid processing. The step was conducted were activated natural zeolite, than making of photocatalytic from TiO2 and natural zeolite, and the last is drying on the oven and calcination at 5000C. In the diffraction pattern of TiO2-zeolit (20%) there was a peak of TiO2 around of 2θ about 25,3o, it is indicated that TiO2 was surroundings on natural zeolite. TiO2-zeolit (20%) which was analyzed with SEM showed that active metal of TiO2 has been surroundings on surface of zeolite. Analysis of gas absorption (GSA) with BET methods showed an increase wide of 7,0 m2/g for zeolite and19,4 m2/g for TiO2-zeolit (20%). Best degradation of methylene blue was indicated by TiO2-zeolit (20%) with the value of 82,5% after the radiation with ultraviolet for 80 minutes and measured by visible UV spectrophotometer.
SINTESIS DAN KARAKTERISASI SENYAWA 3,3’-BENZILIDENA BIS- 4 – HIDROKSI KUMARIN UNTUK SEDIAAN RADIOTERAPI Setiawan, Duyeh; Rakhmawaty, Diana
Chimica et Natura Acta Vol 2, No 3 (2014)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (600.391 KB) | DOI: 10.24198/cna.v2.n3.9161

Abstract

Penelitian yang sedang dikembangkan saat ini adalah senyawa kimia yang memiliki aktivitas biologis anti kanker, salah satunya adalah senyawa turunan kumarin yaitu 3,3’-benzilidena bis-4-hidroksikumarin. Senyawa kumarin dapat membentuk kompleks stabil dengan ion logam valensi tiga yang bersifat radioisotop untuk meningkatkan aktivitas biologinya terhadap anti kanker. Penelitian ini bertujuan melakukan sintesis dan karakterisasi kumarin sebagai ligan untuk disiapkan dalam pembuatan senyawa kompleks kumarin bertanda radioisotop untuk sediaan radioterapi. Senyawa kumarin disintesis dengan cara mereaksikan benzaldehid dan 4-hidroksikumarin melalui reaksi kondensasi. Karakterisasi senyawa kumarin meliputi penentuan titik leleh, FTIR, 1H-NMR, 13C-NMR. Hasil karakterisasi kumarin diperoleh dalam bentuk kristal berwarna putih sebanyak 5,79 g dan rendemen 56,34 %, mudak larut dalam aseton, mempunyai titik leleh 233 °C. Hasil penelitian diharapkan dapat digunakan dalam pembuatan sediaan radiofarmaka alternatif untuk terapi kanker.
The Use of TiO2-SiO2 in Photocatalytic Process to Degrade Toxic and Dangerous Waste Destiarti, Lia; Tjokronegoro, Roekmiati; Rakhmawaty, Diana; Rudiyansyah,
Makara Journal of Science Vol. 19, No. 1
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study was conducted to investigate the use of TiO2 immobilized on SiO2 (TiO2-SiO2) in a photocatalytic process to degrade toxic industrial waste, phenol, linear alkylbenzene sulfonate (LAS), and Cr(VI), which is dangerous for humans and the environment. Titanium dioxide (TiO2), as a photocatalyst, can make the solution become turbid. Thus, TiO2-SiO2 was used to increase the possibility of ultraviolet (UV) transmission. The phenol and LAS levels were measured with the Indonesian National Standard (INS) while the Cr(VI) level was determined with the colorimetric method. The activity test for the catalyst in suspension and immobilization against phenol showed that TiO2-SiO2 was more active than TiO2. By using the photocatalytic process with the TiO2-SiO2 photocatalyst for 8 h, degradation of phenol and LAS reached 50% as a single compound and 12% as a mixture. However, TiO2-SiO2 did not decrease Cr(VI)
Co-Authors Arfan Sani A., Arfan Sani Atiek Rostika N., Atiek Rostika Atiek Rostika Noviyanti Destiarti, Lia Duyeh Setiawan Roekmiati Tjokronegoro, Roekmiati Rudiyansyah, S Solihudin, S Yati B Yuliyati, Yati B