Widodo, Didik Setyo
Unknown Affiliation

Published : 2 Documents

Found 2 Documents

Hydrazine and Urea Fueled-Solution Combustion Method for Bi2O3 Synthesis: Characterization of Physicochemical Properties and Photocatalytic Activity Astuti, Yayuk; Elesta, Prisca Putri; Widodo, Didik Setyo; Widiyandari, Hendri; Balgis, Ratna
Bulletin of Chemical Reaction Engineering & Catalysis 2020: BCREC Volume 15 Issue 1 Year 2020 (SCOPUS and Web of Science Indexed, April 2020)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (932.521 KB) | DOI: 10.9767/bcrec.15.1.5483.104-111


Bismuth oxide synthesis using solution combustion method fuelled by hydrazine and urea has been conducted. This study aims to examine the effect of the applied fuels, urea and hydrazine, on product characteristics and photocatalytic activity in degrading rhodamine B dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) in a nitric acid solvent. Fuel was added and then stirred. The solution formed was heated at 300 ºC for 8 hours. The product obtained was then calcined at 700 ºC for 4 hours. Bismuth oxide synthesized with urea (BO1) and hydrazine (BO2) as fuels both obtained form of yellow powder. The formation of bismuth oxide is indicated by the vibrations of the Bi–O–Bi and Bi–O groups and the crystal structure of a-Bi2O3 in both products. Photocatalytic activity test showed that BO1 has a photocatalyst activity in degrading rhodamine B higher than that of BO2 with constant values of  3.83×10-5 s-1 and 3.43×10-5 s-1, respectively. The high photocatalytic activity can be examined through several factors, such as: band gap values, crystal structure, morphology, and surface area, acquired as a result of the use of different fuels in the synthesis process. Copyright © 2020 BCREC Group. All rights reserved 
ADSORPSI METHYLENE BLUE (MB) MENGGUNAKAN ABU LAYANG BATUBARA TERAKTIVASI LARUTAN NAOH Dwijayanti, Umi; Gunawan, Gunawan; Widodo, Didik Setyo; Haris, Abdul; Suyati, Linda; Lusiana, Retno Ariadi
Analit: Analytical and Environmental Chemistry Vol 5, No 1 (2020): Jurnal Analit : Analytical and Environmental Chemistry Volume 5, No. 01, April 2
Publisher : Universitas Lampung Jl. Prof. Dr. Sumatri Brojonegoro No.1 Bandar Lampung

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Penelitian tentang adsorpsi methylene blue (MB) oleh abu layang batubara teraktivasi NaOH telah dilakukan. Aktivasi abu layang dilakukan dengan menggunakan metode hidrotermal pada temperatur 80 oC selama 12 jam. Abu layang yang sudah teraktivasi dikarakterisasi menggunakan FTIR, dan studi adsorpsi dengan melakukan variasi pH, waktu kontak, dan konsentrasi adsorbat. Karakterisasi FTIR menunjukkan adanya silikat atau aluminat dari abu layang teraktivasi yang bertanggung jawab pada adsopsi MB yaitu vibrasi tekuk ikatan Si atau Al dengan O pada bilangan gelombang 420-500 cm-1. Abu layang teraktivasi dapat mengadsorpsi zat warna MB pada pH 7 dengan waktu kontak optimum 90 menit. Adsorpsi MB mengikuti pola isoterm Langmuir dan memiliki kapasitas adsorpsi sebesar 500 mg/g.http://dx.doi.org/10.23960/aec.v5.i1.2020.p01-14