Acta Chemica Malaysia

Journal: Acta Chemica Malaysia (ACMY)
Author:  Bin Guoa, Mai Furukawa, Ikki Tateishi, Hideyuki Katsumata, Ahmed H. A. Dabwan, 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.01.2026.28.31

Graphitic carbon nitride (g-C₃N₄) photocatalysts were synthesized via thermal polymerization of urea in the presence of 1,3,5-trihydroxybenzene (THB) as a molecular modifier. The incorporation of 10 mg THB resulted in enhanced visible-light-driven photocatalytic performance for dye decolorization in aqueous solution. Under 450 nm irradiation, the modified g-C₃N₄ (T10) achieved over 90% degradation of Orange II within 60 min, with a pseudo-first-order rate constant approximately five times higher than that of pristine g-C₃N₄. Kinetic analysis based on the Langmuir–Hinshelwood model confirmed improved charge transfer efficiency and reduced electron–hole recombination. In contrast, Rhodamine B degradation exhibited substrate-dependent behavior, indicating that surface modification influences adsorption characteristics and interfacial reaction pathways. The enhanced performance toward Orange II is attributed to extended π- conjugation, improved visible-light absorption, and surface hydroxyl functionalities introduced by THB, which promote dye adsorption and reactive oxygen species formation. These findings demonstrate that molecular-level modification of g-C₃N₄ using aromatic hydroxyl compounds provides an effective strategy to tailor photocatalytic selectivity and improve visible-light-driven wastewater treatment performance.

Journal: Acta Chemica Malaysia (ACMY)
Author: Ojike P. C., Ezeugo J.O, Ifediorah E. I
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.01.2026.20.27

The growing environmental concerns associated with synthetic corrosion inhibitors have also heightened demand for environmentally friendly substitutes derived from natural sources. This paper assesses the synthesis and inhibition of green corrosion inhibitors from bio-extracts of Carica papaya leaf (CPL), Vernonia amygdalina leaf (VGL), and Annona muricata leaf (AML) on aluminium, mild steel, and zinc in HCl and H2SO4. Phytochemicals such as alkaloids, flavonoids, phenols, saponins, tannins, steroids, phytates, and glycosides were confirmed by phytochemical analysis. It was determined that the Bio-Extracts were described by Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography-Mass Spectrometry (GC-MS). Thermometric analysis and scanning electron microscopy (SEM) were used to evaluate corrosion inhibition. An optimal inhibition efficiency of 75.42 -84.56% was obtained with the extracts, which was due to the formation of protective Fe 2 + -extract complexes by adsorption on metal surfaces. FT-IR spectra have shown shifts in peak positions, indicating synergistic interactions between functional groups. These results demonstrated the possibility of using bio-extracts as non-toxic, sustainable industrial activity inhibitors.

Journal: Acta Chemica Malaysia (ACMY)
Author:A.M. Usmana, A.A.Muhammad, Jamilu Ahmad Bello, Abdulrahman Muhammad Haris, Sulaiman Tijjani Nasiru
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.01.2026.12.19

Quantum chemical study was carried out with the aid of material studio using density functional theory (DFT), which examined the effects of specific chloroquinoline molecules on the inhibition of aluminium corrosion in hydrochloric acid, as well as the effects of the chlorine substituent at positions 5, 6, and 8 of the core quinoline. Prior to optimization of each molecule, simulations were performed by means of the DFT electronic program DMol3 using the Mulliken population analysis in the Material Studio. DMol3 permitted the analysis of the electronic structures and energies of molecules, solids and surfaces. The analysis of the quantum chemical parameters, the adsorption parameters form the simulation of the molecules, the Mulliken and Hirshfeld values of the fukui indices for the three molecules of the 5-ClQ, 6-ClQ and 8-ClQ indicated that all the three molecules exhibits high potential for inhibition of aluminium corrosion in HCl environment. The most popular parameters which play a prominent role were the eigen values of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO), the HOMO-LUMO gap (ΔE), chemical hardness and softness, electro-negativity and the number of electrons transferred from inhibitor molecule to the metal surface. All the molecules showed good corrosion inhibition tendency, however, 5-ClQ molecule gives better aluminium corrosion inhibition potential than other two molecules. The orientation of the chlorine substituent on the core quinoline was found to be responsible for intra-molecular intraction which leads to reduced attraction to the aluminium surface for the 6-ClQ and 8-ClQ molecules, hence lower corrosion inhibition tendency than 5-ClQ molecule despite having the same molecular mass.