Acta Chemica Malaysia

Journal: Acta Chemica Malaysia (ACMY)
Author: Bin Guo, Ahmed H.A. Dabwanb, Mai Furukawa, Ikki Tateishi, Hideyuki Katsumata, Satoshi Kaneco
ISSN: 2576-6732
e-ISSN: 2576-6724

This is an open access journal distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

DOI: 10.26480/acmy.01.2022.43.47

In this work palladium nanoparticles were supported on mixed mixture of 75 wt % anatase and 25 wt % rutile titanium oxide to create holes on the surface of titanium oxide and electrons on the surface of metal electrodes. The effects of different parameters were investigated namely, oxalic acid wt %, pH, Temperature, Irradiation time, and NaCl wt %. The formed particles were characterized by X-ray diffraction, high resolution transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy and diffuse reflectance UV-V is spectroscopy and nitrogen adsorption–desorption isotherms (BET). Hydrogen evolution was monitored by sampling at different intervals and measured using gas chromatography. Optimum conditions to obtain the highest hydrogen yields were; oxalic acid 2 wt % (2229 μmol g-1), pH 2.2 (2229 μmol g-1), Temperature 50 oC (2180 μmol g-1) and NaCl 1 wt % (3530 μmol g-1). No decreasing was observed when long term experiment was evaluated (154 hrs). This could be attributed to the fact when TiO2 is irradiated with light having a wavelength of 380 nm or less, a pair of electron holes is formed. Using the electrons, Pd ions are reduced and precipitated on TiO2. At this time, if Pd is reduced and precipitated on TiO2, it is considered that the electrons photogenerated by TiO2 move onto Pd, suppress the recombination of electrons and holes, and promote the hydrogen production reaction in other words photogeneration can proceed as long as there is irradiation.

Journal: Acta Chemica Malaysia (ACMY)
Author: Jamal Kouhdareh, Hassan Keypour, Sedigheh Alavinia
ISSN: 2576-6732
e-ISSN: 2576-6724

This is an open access journal distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

DOI: 10.26480/acmy.01.2022.35.42

In recent days, nanohybrid metal organic frameworks (MOF) have been considered as next generation catalysts due to their unique features like large surface to volume ratio, tailorable geometry, uniform pore sizes and homogeneous distribution of active sites. In this report, we address the thiophene-2-aldehyde modified 3D Zn-centred MOF IRMOF-3 following a post synthetic modification approach (schiff base IRMOF-3). Utilizing the excellent chelating ability of thiophene-2-aldehyd, Pd ions are immobilized over the host matrix MOF. The as-synthesized material was physicochemically characterized using a broad range of analytical techniques like FT-IR, electron microscopy, EDS, elemental mapping, and XRD. Subsequently the material has been catalytically employed in the classical Suzuki–Miyaura coupling towards the synthesis of diverse biphenyl derivatives at sustainable conditions. There are very few reports on the covalently modified MOFs towards the organic coupling reactions. The catalyst has been isolated by centrifugation and recycled in 10 consecutive runs with almost insignificant leaching and minute decrease in reactivity.

Journal: Acta Chemica Malaysia (ACMY)
Author: Wafa F. S. Badulla, Ebtesam S. Bamahmood, Randa M. Saif
ISSN: 2576-6732
e-ISSN: 2576-6724

This is an open access journal distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

DOI: 10.26480/acmy.02.2022.94.99

Skin whitening creams & products (SL) contain certain unsafe chemicals such as mercury, steroids such as; Clobetasol propionate, and hydroquinone (HQ), which have negative effects on health if used excessively. The present study aimed to determine the presence of the HQ and CP in the SL creams that are sold in the Aden Market and measure the pH of these creams as well. The determination of the HQ & CP in the SL creams was carried out by using UV-Spectroscopy. This study indicated the presence of HQ in all creams in the range between 3.00 ± 1.08- 6.72 ± 0.02 except in Cream I. The lower % was found in Cream V and the higher % was in Cream II. The CP was detected in five creams out of seven creams. The range of the CP was between 0.0085 ± 0.46 – and 0.164 ± 0.15. The pH of all formulations was found to be between 3.63 ± 0.006 and 7.50 ± 0.02. The SL creams or products may contain HQ and CP even if the label doesn’t indicate the presence of these compounds. There should be more control, restriction of the use, and distribution of such products to prevent possible long-term adverse effects.