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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

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Sifat dan Aplikasi Nanomaterial Magnetik sebagai Katalis Heterogen Ardiansah, Bayu; Bakri, Ridla; Hidayat, Mirzanur
Omega: Jurnal Fisika dan Pendidikan Fisika Vol 2 No 2 (2016)
Publisher : Program Studi Pendidikan Fisika UHAMKA

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Abstract

Nanomaterial mangnetik merupakan tren baru dalam ilmu material yang menunjukkan sifat fisikokimia yang khas dan memiliki manfaat yang luas pada berbagai disiplin ilmu. Di dalam paper ini akan dibahas mengenai sifat dan kegunaan nanomaterial magnetik khususnya di bidang katalis heterogen sintesis senyawa organik yang aktif dan dapat digunakan kembali ( reusable).
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.
Penentuan Umur Bercak Darah Manusia pada Kain Katun dengan Menggunakan High Performance Liquid Chromatography Mohammad Tegar Indrayana; Wibisana Widiatmaka; Ade Firmansyah Sugiharto; Ridla Bakri
Jurnal Ilmu Kedokteran Vol 8, No 1 (2014): Jurnal Ilmu Kedokteran
Publisher : Fakultas Kedokteran Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (107.923 KB) | DOI: 10.26891/JIK.v8i1.2014.8-17

Abstract

This research is to study the method in determining the age of human bloodstain due the rarity of human bloodstainresearches in Indonesia, by analyzing the X and Y peaks that appeared in High Performance Liquid Chromatography(HPLC). This research is experimental with time series for 11 days observation by exposing the bloodstain onto 33pieces of cotton fabric, each measuring 1 cm x 1 cm that originated from 3 respondents with environmental conditionsof the FKUI/RSUPN Dr. Cipto Mangunkusumo Forensic and Medico-legal Department which represents the area ofCentral Jakarta. The results of this research is the X and Y peaks do not point to a linearity so that the criteria for linearregression equation is not met. The conclusion of this research is age of human bloodstain on cotton fabric byanalyzing X peak with HPLC cannot yet be used pragmatically in the field in accord to the conditions at the crimescene.
PREPARATION of [BzMe3N]2[Na2W4O12(OMe)4(MeOH)6].6MeOH Bakri, Ridla
Makara Journal of Science Vol. 7, No. 1
Publisher : UI Scholars Hub

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Abstract

An attempt to prepare trinuclear tungsten oxoalkoxides [BzMe3N]3 [W3O8 (OMe)5 ] from the reaction between WO2 (OMe)2 , [BzMe3N]2WO4 and [BzMe3N](OMe) in the ratio of 2:1:1 in MeOH produced [BzMe3N]2 [Na2W4O12(OMe)4 (MeOH)6 ].6MeOH. Suitable crystals for X-ray chrystallographic studies were obtained from hot mixture of methanol-acetonitrile solution. The I.R., 1H-NMR, and microanalysis data including crystal structure of [Na2W4O12(OMe)4 (MeOH)6 ] 2- anion are reported
THE SYNTHESES OF [BzMe3N]2[Mo4O10(OMe)6] Bakri, Ridla
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

In an attempt to synthesize [BzMe3N]2Mo2O5(OMe)5 from the reaction of [BzMe3N]2MoO4 and MoO(OMe)4 in the ratio of 1:1 in methanol has produced [BzMe3N]2Mo4O10(OMe)6. The formation of [Mo4O10(OMe)6]2- anion suggests that ligand dissociation has occured in solution. Suitable crystals for X-ray chrystallographic were obtained from hot methanol and the crystal structure of [BzMe3N]2Mo4O10(OMe)6 has been solved and reported here in.
THE SYNTHESES OF [BzMe3N]2[Mo4O10(OMe)6] Bakri, Ridla
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

In an attempt to synthesize [BzMe3N]2Mo2O5(OMe)5 from the reaction of [BzMe3N]2MoO4 and MoO(OMe)4 in the ratio of 1:1 in methanol has produced [BzMe3N]2Mo4O10(OMe)6. The formation of [Mo4O10(OMe)6]2- anion suggests that ligand dissociation has occured in solution. Suitable crystals for X-ray chrystallographic were obtained from hot methanol and the crystal structure of [BzMe3N]2Mo4O10(OMe)6 has been solved and reported here in.
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%.
Green Synthesis of Cu-BDC Nanosheets for Methylene Blue Degradation Saridewi, Nanda; Zulys, Agustino; Bakri, Ridla
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 4 Year 2025 (December 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20458

Abstract

Metal Organic Frameworks (MOFs) with two-dimensional (2D) nanosheet morphology possess unique surface characteristics, making them highly favourable for photocatalytic applications. This study synthesised Cu²⁺-based MOF nanosheets using a modified three-layer method. This approach is relatively simple, energy-efficient, and qualifies as a green synthesis method. The MOFs were prepared from copper(II) nitrate trihydrate (Cu(NO₃)₂·3H₂O) as the metal precursor and 1,4-benzenedicarboxylic acid (H₂BDC) as the organic linker, aiming to evaluate their photocatalytic activity for methylene blue degradation. The resulting Cu-BDC nanosheets displayed characteristic FTIR absorption bands at 1501 and 1547 cm⁻¹ corresponding to symmetric and asymmetric C=O stretching, 1394 cm⁻¹ for C–O stretching, and peaks at 751 and 569 cm⁻¹ associated with Cu–O vibrations. The XRD analysis revealed four sharp peaks at 2θ values of 8.2°, 10.2°, 16.1°, and 34.1°, indicating good crystallinity with a calculated crystallite size of 22.03 nm, and the bandgap energy is 3.89 eV. Cu-BDC nanosheets exhibit a thin sheet morphology with elemental compositions of carbon 73.08%, oxygen 11.19%, and copper 15.73%. Cu-BDC nanosheets exhibit optimal degradation activity at pH 13, with an optimal catalyst dose of 5 mg and an initial dye concentration of 20 ppm, achieving a degradation capacity of 98.62 mg/g after 120 minutes of reaction. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Easy Preparation of Zinc Molybdate Photocatalyst and Its Application for Degradation of Methylene Blue Bakri, Ridla; Firmansyah, Rika; Yulizar, Yoki
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 14 No. 2 (2023): November
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2023.v14.no2.p45-53

Abstract

Photocatalyst is one way that can be done to overcome the problem of dye waste in water. Hazardous chemicals are regularly used in the manufacture of photocatalysts. In this research, ZnMoO4 was prepared by an environmentally friendly and cost-effective synthesis. The functional groups, crystalline structure and morphology of ZnMoO4 were characterised using fourier transform infrared (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). The band gap energy has been studied through UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The photocatalytic activity of ZnMoO4 was tested against the organic pollutant methylene blue under visible light irradiation and its degradation products were analyzed with a UV-Vis spectrophotometer at a wavelength of 664 nm. The photocatalytic process of ZnMoO4 has been able to degrade 99% of methylene blue after 80 minutes of irradiation. The excellent photodegradation performance indicates that the transition activity of electron currents from the valence band to the conduction band on ZnMoO4 is going well.
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