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All Journal Jurnal Riset Kimia IJEMS (Indonesian Journal of Environmental Management and Sustainability)
Syukri Darajat
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Chemistry Decision Sciences, Operations Research & Management Energy Environmental Science Public Health

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SENG OKSIDA (ZnO) SEBAGAI FOTOKATALIS PADA PROSES DEGRADASI SENYAWA BIRU METILEN Darajat, Syukri; Aziz, Hermansyah; Alif, Admin
Jurnal Riset Kimia Vol 1, No 2 (2008): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i2.72

Abstract

 ABSTRACT A research aimed to study the influence of ZnO white powder on photodegradation of methylene blue using Merkuri lamp (l = 365 nm) as light source have been reached. A suspension of ZnO (40 mg) mixed with 25 mL of methylene blue solution (initial concentration of 0.015 mM) then was illuminated for 60 minutes showed degradation and quantum yield amounting 23.84% and 3.55 molecules photon-1, respectively. These results mean that by using ZnO as photocatalyst there is about four times efficiency than the one without ZnO either in case of time consumed or the number of photon applied. In kinetic study, it has been observed that such semiconductor-catalyzed photochemical reaction obeys the first order rule where rate constant and half time consecutively were 0.0029 minute-1 and 231 minutes.  Keywords : photodegradation, photocatalyst, quantum yield, semiconductor, photochemical reaction.
SENG OKSIDA (ZnO) SEBAGAI FOTOKATALIS PADA PROSES DEGRADASI SENYAWA BIRU METILEN Syukri Darajat; Hermansyah Aziz; Admin Alif
Jurnal Riset Kimia Vol. 1 No. 2 (2008): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v1i2.72

Abstract

 ABSTRACT A research aimed to study the influence of ZnO white powder on photodegradation of methylene blue using Merkuri lamp (l = 365 nm) as light source have been reached. A suspension of ZnO (40 mg) mixed with 25 mL of methylene blue solution (initial concentration of 0.015 mM) then was illuminated for 60 minutes showed degradation and quantum yield amounting 23.84% and 3.55 molecules photon-1, respectively. These results mean that by using ZnO as photocatalyst there is about four times efficiency than the one without ZnO either in case of time consumed or the number of photon applied. In kinetic study, it has been observed that such semiconductor-catalyzed photochemical reaction obeys the first order rule where rate constant and half time consecutively were 0.0029 minute-1 and 231 minutes.  Keywords : photodegradation, photocatalyst, quantum yield, semiconductor, photochemical reaction.
Utilization of Hydroxyapatite from Quail Eggshells as an Adsorbent for Lead Metal Ions Pb(II) Alif, Matlal Fajri; Darajat, Syukri; Azizah, Siti
Indonesian Journal of Environmental Management and Sustainability Vol. 9 No. 1 (2025): March
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2025.9.1.20-27

Abstract

Lead is a toxic metal known for its harmful effects, even in minor quantities, because it does not break down naturally and can therefore pollute ecosystems. This research involved the creation of hydroxyapatite using quail egg shell through a sol-gel method, which served as a medium for capturing Pb ions in a batch process by assessing different parameters. The created material was analyzed using X-Ray Diffraction (XRD) to confirm its crystal form, SEM (Scanning Electron Microscopy) to analyze its surface, FTIR (Fourier Transform Infrared Spectroscopy), and morphology to determine the functional units that were present. Sorption tests were performed under various scenarios, encompassing different pH levels, the initial Pb ion concentration, and time of contact, with the outcome evaluated through atomic absorption spectrophotometry (AAS). The results demonstrated that the optimal conditions for Pb ion uptake were observed at a concentration of 800 mg/L with 0.1 g of absorbent as well as a contact time of 60 minutes, achieving a lead ion removal rate of 71.48%. The sorption isotherm followed the Langmuir model, while the sorption kinetics fit the pseudo-order two model, indicating a monolayer sorption mechanism on a uniform surface. These outcomes suggest hydroxyapatite derived from quail eggshells is a promising eco-friendly material for treating wastewater containing heavy metal ions.
Co-Authors Admin Alif Admin Alif Hermansyah Aziz Matlal Fajri Alif Siti Azizah