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Sharifah Bee Abdul Hamid

Bio: Sharifah Bee Abdul Hamid is an academic researcher from University of Malaya. The author has contributed to research in topics: Nanoparticle & Fourier transform infrared spectroscopy. The author has an hindex of 15, co-authored 35 publications receiving 713 citations.

Papers
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TL;DR: In this article, a review of the substantial progress on the synthesis of mesoporous titania in terms of its enhanced surface areas, particle size, and porosity is presented.

128 citations

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TL;DR: In this paper, the authors highlight the available scientific and fundamental understanding towards the water oxidation mechanism on ZnO surfaces, as well as present a summary on the modification strategies carried out to increase the photocatalytic response of ZnOs.
Abstract: The investigation of the water oxidation mechanism on photocatalytic semiconductor surfaces has gained much attention for its potential to unlock the technological limitations of producing H2 from carbon-free sources, i.e., H2O. This review seeks to highlight the available scientific and fundamental understanding towards the water oxidation mechanism on ZnO surfaces, as well as present a summary on the modification strategies carried out to increase the photocatalytic response of ZnO.

113 citations

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TL;DR: Current review highlights the progress on implantable biofuel cell, with focus on the nano-carbon functionalization for enzyme immobilization enhancement in glucose/O2 biofuel cells.

103 citations

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TL;DR: The results elucidated that the base pretreatment was efficient enough to yield porous carbon with an enlarged surface area, which can successfully eliminate Cu(II) cations from waste water.
Abstract: This study examines the feasibility of catalytically pretreated biochar derived from the dried exocarp or fruit peel of mangostene with Group I alkali metal hydroxide (KOH). The pretreated char was activated in the presence of carbon dioxide gas flow at high temperature to upgrade its physiochemical properties for the removal of copper, Cu(II) cations in single solute system. The effect of three independent variables, including temperature, agitation time and concentration, on sorption performance were carried out. Reaction kinetics parameters were determined by using linear regression analysis of the pseudo first, pseudo second, Elovich and intra-particle diffusion models. The regression co-efficient, R² values were best for the pseudo second order kinetic model for all the concentration ranges under investigation. This implied that Cu(II) cations were adsorbed mainly by chemical interactions with the surface active sites of the activated biochar. Langmuir, Freundlich and Temkin isotherm models were used to interpret the equilibrium data at different temperature. Thermodynamic studies revealed that the sorption process was spontaneous and endothermic. The surface area of the activated sample was 367.10 m²/g, whereas before base activation, it was only 1.22 m²/g. The results elucidated that the base pretreatment was efficient enough to yield porous carbon with an enlarged surface area, which can successfully eliminate Cu(II) cations from waste water.

61 citations

Journal ArticleDOI
TL;DR: In this article, the preparation of α-Fe2O3 nanoparticles using curcuma and tea leaves extract is reported, and the as-prepared samples have well-crystallized rhombohedral structure.
Abstract: In this study, the preparation of α-Fe2O3 nanoparticles using curcuma and tea leaves extract are reported. The curcuma and tea leaves are acted as a reductant and stabilizer. The crystal structure and particle size of the as-synthesized materials were measured through X-ray diffraction. X-ray diffraction patterns revealed that the as-prepared samples were α-Fe2O3 nanoparticles with well-crystallized rhombohedral structure and the crystallite sizes of the α-Fe2O3 nanoparticles are 4 and 5 nm. Scanning electron microscopy images showed that the prepared samples have spherical shape. The purity and properties of the as-synthesized α-Fe2O3 nanoparticles were measured by Raman spectroscopy. The chemical compositions of the as-prepared α-Fe2O3 nanoparticles have been analyzed by Fourier transform infrared spectroscopy. The absorption edge of the α-Fe2O3 nanoparticles are 561 and 551 nm. The photocatalytic activity of the α-Fe2O3 nanoparticles was measured by degradation of methylene orange and the α-Fe2O3 nanoparticles showed the excellent photocatalytic performance.

50 citations


Cited by
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Journal ArticleDOI
TL;DR: This paper presents a critical review of recent achievements in the modification of ZnO photocatalyst for organic contaminants degradation and recommends improvements in the heterogeneous photocatalysis under UV/visible/solar illumination.

1,646 citations

Journal ArticleDOI
TL;DR: Modification to produce engineered/designer biochar is likely to enhance the sorption capacity of biochar and its potential applications for environmental remediation.

905 citations

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TL;DR: In this article, the main advancements in overcoming the barriers accompanied by pure ZnO and the criteria for fabrication of effective visible-light-responsive (ZnO-based) photocatalysts are reviewed.

697 citations

Journal ArticleDOI
TL;DR: This article analyzes the interaction of nanoparticle surface and ligands with different chemical groups, the types of bonding, the final dispersibility of ligand-coated nanoparticles in complex media, their reactivity, and their performance in biomedicine, photodetectors, photovoltaic devices, light-emitting devices, sensors, memory devices, thermoelectric applications, and catalysis.
Abstract: The design of nanoparticles is critical for their efficient use in many applications ranging from biomedicine to sensing and energy. While shape and size are responsible for the properties of the inorganic nanoparticle core, the choice of ligands is of utmost importance for the colloidal stability and function of the nanoparticles. Moreover, the selection of ligands employed in nanoparticle synthesis can determine their final size and shape. Ligands added after nanoparticle synthesis infer both new properties as well as provide enhanced colloidal stability. In this article, we provide a comprehensive review on the role of the ligands with respect to the nanoparticle morphology, stability, and function. We analyze the interaction of nanoparticle surface and ligands with different chemical groups, the types of bonding, the final dispersibility of ligand-coated nanoparticles in complex media, their reactivity, and their performance in biomedicine, photodetectors, photovoltaic devices, light-emitting devices, sensors, memory devices, thermoelectric applications, and catalysis.

616 citations

Journal ArticleDOI
TL;DR: Modified biochar (BC) is reviewed in its preparation, functionality, applications and regeneration, and the Langmuir isotherm model provides the best fit for sorption equilibria of heavy metals and anionic contaminants and the pseudo 2(nd) order is the most appropriate model of sorption kinetics for all contaminants.

558 citations