Browsing by Author "Hamidah Abdullah"
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Publication Impact Of Doping And Additive Applications On Photocatalyst Textural Properties In Removing Organic Pollutants: A Review(Multidisciplinary Digital Publishing Institute (MDPI), 2021) ;Safia Syazana Mohtar ;Farhana Aziz ;Ahmad Fauzi Ismail ;Nonni Soraya Sambudi ;Hamidah Abdullah ;Ahmad Nazrul Bin RosliBunsho OhtaniThe effect of ion doping and the incorporation of additives on photocatalysts’ textural properties have been reviewed. Generally, it can be summarised that ion doping and additives have beneficial effects on photocatalytic efficiency and not all have an increase in the surface area. The excessive amount of dopants and additives will produce larger aggregated particles and also cover the mesoporous structures, thereby increasing the pore size (Pd) and pore volume (Pv). An excessive amount of dopants also leads to visible light shielding effects, thus influence photocatalytic performance. Ion doping also shows some increment in the surface areas, but it has been identified that synergistic effects of the surface area, porosity, and dopant amount contribute to the photocatalytic performance. It is therefore important to understand the effect of doping and the application of additives on the textural properties of photocatalysts, thus, their performance. This review will provide an insight into the development of photocatalyst with better performance for wastewater treatment applications. - Some of the metrics are blocked by yourconsent settings
Publication The Synthesis of Oxalate-modified Pyrite/chitosan as an Antibacterial Composite(Emerald Publishing, 2023) ;Rashween Kaur Jagjit Singh ;Khee Chung Hui ;Nurul Khusna Mohd Salleh ;Prakash Peechmani ;Farhana Aziz ;Hamidah Abdullah ;Ahmad Nazrul RosliNonni Soraya SambudiThe combination of organic and inorganic components has produced bioactive materials with excellent properties. Chitosan is a widely used organic component that has received recognition as a biocompatible material. In contrast, naturally occurring pyrite has so far received limited exposure as a biomaterial, despite its great antibacterial activity. Hence, the incorporation of pyrite into the chitosan matrix is expected to highlight the usage of pyrite as a bioactive material, particularly in antibacterial response. In this research, chitosan and oxalate-modified pyrite were combined to form beads at wt% pyrite loadings of 1, 3 and 5%. Energy-dispersive X-ray spectroscopy analysis could confirm the loading of pyrite into the bead matrix. The beads exhibit a high water absorption ability. With the addition of pyrite, the absorption of water could increase up to 37% compared with that of blank chitosan beads. The immersion of beads in simulated body fluid shows the bioactivity of beads by formation of apatite. Microbial activity against Escherichia coli and Staphylococcus aureus is exhibited by all composite beads containing oxalate-modified pyrite, particularly by beads containing 5 wt% oxalate–pyrite.