Article Per Year (5 Year)
p-Index From 2021 - 2026
0.61
P-Index
This Author published in this journals
All Journal VALENSI Jurnal Ilmu Kedokteran (Journal of Medical Science) Omega: Jurnal Fisika dan Pendidikan Fisika Jurnal Riset Teknologi Pencegahan Pencemaran Industri Makara Journal of Science Bulletin of Chemical Reaction Engineering & Catalysis
Ridla Bakri
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, University Of Indonesia, Jl. Lingkar Kampus Raya, Pondok Cina, Beji, Depok, Jawa Barat 16424, Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Education Energy Engineering Environmental Science Health Professions Medicine & Pharmacology Physics Public Health

Published : 9 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search
Journal : VALENSI

 1 
Degradasi Fotokatalitik Zat Warna Direct Yellow dan Direct Violet dengan Katalis TiO2/AgI - Sinar UV Riswiyanto S; Ridla Bakri; Anggi Titis A
Jurnal Kimia Valensi Jurnal Valensi Volume 2, No.1, November 2010
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v2i1.230

Abstract

Industri tekstil di Indonesia telah berkembang semakin pesat. Mengakibatkan kebutuhan akan zat warna semakin bertambah. Zat warna yang sering digunakan merupakan golongan azo yang mempunyai sifat non-biodegradable, diantaranya adalah Direct Yellow dan Direct Violet. Limbah zat warna harus diolah terlebih dahulu sebelum dibuang ke perairan. Salah satunya dengan menggunakan radiasi sinar UV dan katalis TiO2/AgI yang sangat menjanjikan dalam mendegradasi senyawa zat warna, hal ini disebabkan oleh kehadiran senyawa AgI yang mempunyai sifat fotosensitif. Hasil penelitian diperoleh kondisi optimum pada pH 5, waktu optimum 90 menit dan kosentrasi zat warna 40 ppm untuk Direct Yellow sedangkan untuk Direct Violet pada pH 6, waktu optimum 60 menit dan konsentrasi zat warna 40 ppm. Untuk campuran zat warna 1:1 (Direct Violet : Direct Yellow) didapatkan hasil sebesar 85,43% dengan kondisi optimum Direct Violet dan 91,32% dengan kondisi optimum Direct Yellow. Campuran zat warna 1:2 (Direct Violet : Direct Yellow) didapatkan hasil sebesar 79,04% dengan kondisi optimum Direct Violet dan 89,95% dengan kondisi optimum Direct Yellow. Campuran zat warna 2:1 (Direct Violet : Direct Yellow) didapatkan hasil sebesar 90,28% dengan kondisi optimum Direct Violet dan 95,08% dengan kondisi optimum Direct Yellow.
Zeolite from Zirconium-Modified Fly Ash Waste for Absorption of Phosphate Compounds in Waters Putri, Mu'izzah Irsyadi; Saefumillah, Asep; Bakri, Ridla
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 9, No. 1, May 2023
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v9i1.26951

Abstract

Eutrophication is a phenomenon of decreasing air quality caused by the very high amount of phosphate ions in the aquatic system. Thus, an effective and efficient adsorbent is needed for phosphate absorption in aquatic systems. In this study, zeolit from fly ash waste was modified with zirconium (Zr) as an adsorbent for phosphate absorption in aquatic systems. Fly ash was pretreated with acid and then synthesised using the hydrothermal method. And then, the results of the fly ash zeolit synthesis were continued using zirconium. The adsorption capacity was tested through several parameters, including the adsorbent concentration test, variations in pH,and contact time. Zirconium-modified zeolite (ZrMZ) adsorbent was the most effective adsorbent for phosphate adsorption, with an adsorption capacity of 3.015 mg-P/g at a 3 g/L adsorbent dosage and pH 7. The adsorption kinetics for the ZrMZ adsorbent followed pseudo-second-order kinetics. The best result of ZrMZ adsorbent to absorb phosphate in lake water was an adsorption capacity value of 0.186 mg-P/g and an adsorption efficiency of 81.137%.
Co-Authors Agustino Zulys Anggi Titis A Ardiansah, Bayu Asep Saefumillah Firmansyah, Rika Hidayat, Mirzanur Indra Puspita Sari Mohammad Tegar Indrayana Nanda Saridewi, Nanda Putri, Mu'izzah Irsyadi Riswiyanto S Sugiharto, Ade Firmansyah Tresye Utari Wibisana Widiatmaka Yoki Yulizar