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All Journal Indonesian Journal of Chemistry
Luma Majeed Ahmed
Department of Chemistry, College of Science, University of Kerbala, Kerbala 56001, Iraq
Chemical Engineering, Chemistry & Bioengineering Chemistry

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Incorporation CdS with ZnS as Composite and Using in Photo-Decolorization of Congo Red Dye Faten Hadi Fakhri; Luma Majeed Ahmed
Indonesian Journal of Chemistry Vol 19, No 4 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (426.682 KB) | DOI: 10.22146/ijc.38335

Abstract

The aim of this manuscript was to modify the ZnS surface by incorporating with CdS photocatalyst. This manner led to depressing the recombination process and increasing the activity. The X-ray Powder Diffraction (XRD) data were proved that the CdS incorporated with ZnS and formed ZnS-CdS nanocomposite by observing new peaks at 26.92, 28.62, 30.52, and 47.26°. Based on the Atomic Force Microscopy (AFM) analysis and Tauc equation, the particle sizes for all samples were raised with decreased the band gap values. The activation energy for decolorization of Congo red with the using ZnS is found to be more than that value for the using prepared ZnS-CdS composite. The percentage of efficiency was found to be increased with modified the ZnS surface.
Preparation, Characterization and Study of the Photodecolorization of Mixed-Ligand Binuclear Co(II) Complex of Schiff Base by ZnO Suhad Kareem Abass; Jassim Abbas Al-Hilfi; Sawsan Khudhair Abbas; Luma Majeed Ahmed
Indonesian Journal of Chemistry Vol 20, No 2 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2284.1 KB) | DOI: 10.22146/ijc.44192

Abstract

In this work, a new mixed-ligand binuclear Co(II) complex of Schiff base was prepared. Moreover, the characterization of this prepared complex was performed by measurement of melting points, UV-Vis spectra, FT-IR spectra, and magnetic susceptibility measurements, and later compared with metal and ligand solutions. It has been discovered that the Schiff bases with Co(II) ion forms a binuclear complex with a stoichiometry of molar ratio 1:2 from “metal:ligand”. The photodecolorization of this complex was done under UV light for ZnO's suspension solution. The results of this photodecolorization showed that the greatest efficiency was obtained with the use of ZnO dose of 300 mg/100 mL and at an initial pH of 7. The decolorization activation energy for this complex is a small value of 11.289 kJ mol–1. Additionally, the thermodynamic study for this reaction is non-spontaneous, endothermic and less random.
Controllable Cetrimide – Assisted Hydrothermal Synthesis of MoFe2O4 and Coupling with Al2O3 as an Effective Photocatalyst for Decolorization of Indigo Carmine Dye Mohammed Ali Hameed; Luma Majeed Ahmed
Indonesian Journal of Chemistry Vol 24, No 1 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.86693

Abstract

This research focuses on the MoFe2O4 nanoparticles synthesized via the hydrothermal method in the presence of positive surfactant- Cetrimide (CT) as a template and stabilizer. This is vital to prevent the agglomeration and reducing its activity. The mean crystal sizes of MoFe2O4 and its composite with alumina system were observed to be 23.97 and 47.41 nm, respectively. The shapes of MoFe2O4 and its composite are nanoplate and like-popcorn nanoparticles. The EDX spectra demonstrated that the MoFe2O4 and its composite are truly synthesized with high purity. The FTIR proved the MoFe2O4 is normal spinel. Based on the Tauc equation, band gaps were measured and found to be 2.78 and 4.05 eV for MoFe2O4 and its nanocomposite. The photo decolorization efficiency (PDE) of indigo carmine dye (IC) using MoFe2O4 nanoparticles and its nanocomposite was discovered to be 90.84 and 91.50%, respectively, at pH 5.3, 10 °C for 50 min. This photoreaction obeys the pseudo-first order, exothermic, spontaneous, and negative activation energy, that attitude to the multi-step occurs in chain reactions. This behavior depends on the speed of the binding step of the dye with Fe3+, Mo6+, or Al3+ in the crystal lattice of MoFe2O4 nanoparticle and its nanocomposite.
Co-Authors Faten Hadi Fakhri Jassim Abbas Al-Hilfi Mohammed Ali Hameed Sawsan Khudhair Abbas Suhad Kareem Abass