Murizam Darus
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Preferred name
Murizam Darus
Official Name
Murizam, Darus
Alternative Name
Murizam, D.
Darus, M.
Darus, Murizam
Main Affiliation
Scopus Author ID
55560769800
Researcher ID
GBJ-8265-2022

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The hydrothermal synthesis of TiO₂-GO with enhance photocatalytic activity

2024-12 , Noor Azira Mohd Noor , Muhammad Asri Idris , Murizam Darus , Nur Farhana Diyana Mohd Yunos

A composite material consisting of titanium dioxide and graphene oxide (TiO₂–GO) was synthesized through a hydrothermal reaction. This reaction involved the use of Ti(SO4)2 in an ethanol–water solvent. Different content of GO was studied to find the optimum parameter. The composites were subjected to characterization, encompassing an examination of their composition, structure, and microstructure through techniques such as X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), and ultraviolet-visible diffuse reflectance spectroscopy. For Raman spectra, the presence of a G-band at approximately 1599 cm-1 and a D-band at 1350 cm-1 in the spectra indicates the presence of graphene oxide (GO). Therefore, the modified Hummer method synthesized graphite to GO. The findings for the XRD spectrum concerning the TiO2–GO composites revealed the presence of finely dispersed anatase TiO₂ particles on the surface of the graphene oxide sheet layer. Diffraction pattern similar to pristine TiO₂, only for TiO2–GO(0.75) and the peak for rutile TiO2 at 2Ɵ values 27.08° for both technique and TiO₂–GO(0.5) for spray technique. Apparently, GO sheets were almost covered by anchored TiO₂ particles, providing the possibility of efficient electronic conducting and electron transportation as in the SEM microstructures. EDS analysis shows the excessive carbon element for TiO₂-GO(0.75) and TiO₂-GO(1). The findings concerning the TiO₂–GO composites revealed the presence of finely dispersed anatase TiO₂ particles on the surface of the graphene oxide sheet layer. Notably, the photocatalytic performance of the TiO₂–GO composite significantly surpassed that of pure TiO₂ in the photodegradation of methyl blue (MB) when exposed to sunlight. The spray technique had a higher photocatalytic degradation percentage which is 82% for TiO₂-GO(0.25) compared to the dropped technique 79% which is TiO₂-GO(0.5). Degradation analysis of methyl blue concluded that the improved photocatalytic activity of TiO₂–GO primarily results from the enhanced efficiency in trapping and transporting electrons, which can be attributed to the presence of graphene oxide (GO).

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Optimization of heating rate on hybrid microwave sintering of the PM Fe-Cr MMCs reinforced with Al2O3particle

2021-07-21 , Wan Abdul Rahman Assyahid Wan Ibrahim , Shayfull Zamree Abd. Rahim , Radhwan Hussin , Muhamad Farizuan Rosli , Mohd Fathullah Ghazli@Ghazali , Murizam Darus

This study reports the optimization of heating rate on the microwave sintered Fe-Cr-Al2O3 metal matrix composite (MMC). The heating rate was selected between 10°C/min to 60°C/min with increment of 10°C/min respectively. The samples were fabricated via PM route and microwave sintering was carried out in a tubular microwave furnace HAMiLab-V3 in N2 atmosphere purposely to avoid any oxidation and chemical reaction to samples. The microstructure of sintered samples was evaluated using SEM and bulk density and porosity were determined based on ASTM B962 - 17 and the microhardness were determined based on ASTM E384. The optimized heating rate of the sample was selected based on the micro hardness value and total porosity percentage as well as based on SEM microstructure analysis. The results revealed that the optimum heating rate occurred at 20°C/min due to the highest value of hardness achieved which is about 119.28 HV with at the highest bulk density about 6.07 g/cm3 and at the lowest total porosity about 14.55%. SEM micrographs also showed that the diffusion was mostly effective at 20°C/min heating rate compared to others, indicated that significant grain boundary diffusion of Fe matrix into Al2O3 particle was occurred.

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Logam bukan ferus

2012 , Ruhiyuddin Mohd Zaki , Faizul Che Pa , Murizam Darus , Mohd Arif Anuar Mohd Salleh

Umum mengetahui kepentingan bahan logam dalam kehidupan manusia seharian. Walaubagaimanapun, tidak ramai yang mempunyai pemahaman jelas berkaitan dengan bahan ini. Situasi ini mengilhamkan para penulis untuk menghasilkan buku Logam Bukan Ferus ini. Bab pertama menjelaskan berkenaan logam bukan ferus secara umum, pola penggunaan logam bukan ferus serta masa depan logam bukan ferus ini. Bab-bab lain pula memberikan fokus kepada beberapa jenis bahan bukan ferus secara spesifik seperti aluminium, zink, plumbum, kuprum, logam refraktori dan logam berharga.

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Near surface studies on the role of graphene oxide in the carbon species activities in it-sofc cathode materials

2020-01-01 , Murizam Darus , Noor Azira Mohd Noor , Muhammad Asri Idris , Nur Farhana Diyana Mohd Yunos

Active roles of carbon species in solid oxide fuel cell (SOFC) cathode was simulated by adding graphene oxide (GO) into Ba0.5Sr0.5Co0.2Fe0.8 (BSCF) materials prepared by sol-gel method. The mixture was heated up to intermediate temperature SOFC range (650 – 850 °C) for a period of 5 hours. A depth-profiling measurement by x-ray photoelectron spectroscopy (XPS) technique was carried out to analyse the carbon species activities at near surface of BSCF cathode. A depth-profiling analysis indicated that the GO bond components are retained under the cathode surface and does not affected the formation of carbonate phases in BSCF cathode.

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Logam Ferus

2011 , Murizam Darus , Ruhiyudin, Mohd Zaki , Faizal, Che Pa , Mohd Arif Anuar Mohd Salleh

Logam ferus adalah kumpulan logam dengan komposisi utamanya terdiri daripada bahan logam besi. Pengetahuan berkaitan bahan ini dapat membantu kita menghasilkan produk yang lebih berkualiti serta mengoptimakan penggunaan bahan ferus dengan lebih cekap. Bab pertama menjelaskan berkenaan logam ferus secara umum, proses penghasilan logam ferus serta piawai yang menjadi rujukan utama industri berkaitan. Bab kedua buku ini pula memberikan fokus kepada sifat-sifat logam ferus serta peranan utama bahan karbon dalam penghasilan keluli. Jenis-jenis keluli yang utama pula dijelaskan dalam bab tiga. Manakala bahagian terakhir menjelaskan proses-proses yang berkaitan dengan penghasilan produk daripada bahan logam ferus.

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Effects of solution treatment temperature on the mechanical properties of commercial recycled aluminium alloy cylinder head (A319)

2010 , Murizam Darus

The present work was performed to investigate the effect of different solution treatment temperature on commercial recycled aluminium alloy cylinder head during artificial ageing process. All samples were sectioned from recycled automotive cylinder head and solution heat treated at 495°C, 510°C and 525°C each for a period of 10 hours. All samples were then quenched into ice water at 0°C and followed by artificial ageing at 180°C for a time up to 20 hours. The precipitation behaviours was monitored by Vicker’s microhardness test and electrical resistivity measurement. Precipitation occurrence were characterised by thermal analysis method and SEM/EDX technique on critical sample. The effect of heat treatment processes was observed by metallographic technique. It is seen that the aluminium alloy exhibit age hardening response similar to artificial ageing where as the the peak-age hardening accelerated when higher solution temperature applied. The hardening effect achieved was due to precipitation of metastable phases of θ˝/θ΄, β˝/β΄, and Q˝Q΄ except for 495°C where the coarser silicon particles contributes to the peak-aged hardening. Silicon particle were fragmentised and spherodised during high temperature solution treatment and homogenised into the aluminium matrix. Prolonged artificial ageing resulting the silicon particles to growth and reduces the nucleation site for phases precipitation, thus reduce the aluminium alloy hardening.

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Hard-porous-lightweight PM Fe-Cr-Al2O3MMCs sintered under hybrid microwave energy

2021-07-21 , Wan Abdul Rahman Assyahid Wan Ibrahim , Shayfull Zamree Abd. Rahim , Radhwan Hussin , Muhamad Farizuan Rosli , Mohd Fathullah Ghazli@Ghazali , Murizam Darus

This study reports on the effect of Al2O3 particles on the density of Fe-Cr metal matrix composite (MMCs) produced through PM route then sintered under hybrid microwave energy. The sample was prepared by mixing the Al2O3 particle in 3D-tubular shaker at six different weight percentage of Fe-Cr matrix started from 5 wt.% to 30 wt.% with 5% in increment. The sintering process was performed under controlled N2 atmosphere in a tubular microwave furnace. Determination of bulk density and porosity was done according to Standard Test Method ASTM B962 - 17, while ASTM E384 was used to determine the microhardness. Assessment of the sample was based on density, porosity, hardness and microstructure evaluation. The result show that incorporating the Al2O3 particle were significantly increase the microhardness, decrease the bulk density and increase the porosity of the in Fe-Cr composite.

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Phase formation and microstructure analyses of La0.6Sr0.4CoO3-δ-BaCe0.54Zr0.36Y0.1O2.95composite material prepared by solid state mixing method

2020 , Abdullah Abdul Samat , Muhammad Syafiq Amsyar Ahmad Pisor , Meor Ahmad Faris Meor Ahmad Tajudin , Nafisah Osman , Mohd Al-Hafiz Mohd Nawi , Murizam Darus , Nurul Akidah Baharuddin

A composite material of La0.6Sr0.4CoO3-δ-BaCe0.54Zr0.36Y0.1O2.95 (LSC-BCZY) was prepared by mixing sol-gel derived LSC and BCZY powders in different weight percentage (wt%) ratio of LSC to BCZY (LSC:BCZY). The prepared composite powders were denoted as S1 (30:70), S2 (50:50) and S3 (70:30). The powders were characterized by an X-ray diffractometer (XRD), a Brunauer-Emmett-Teller (BET) surface area and porosity analyzer and a scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) spectrometer. XRD analysis confirmed that all of the powders were not pure enough due to the presence of impurity phases such as barium carbonate (BaCO3) and strontium carbonate (SrCO3) and unknown phases. S1 powder has the highest amount of impurity phases (81.19 %) and the largest BET surface area (4.82 m2 g−1). All of the powders formed typical clump-like network structure as proven by SEM analysis. EDX analysis revealed that the elemental compositions of La, Sr and Zr were deviated from their nominal mole fractions in all powders due to the Zr-rich clusters formation. The results indicate that the formation of pure and homogenous LSC-BCZY composite powder prepared by solid state mixing method requires further modification and improvement of the preparation method.

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Thermal decomposition, phase formation and microstructure analysis of surfactant assisted sol-gel derived La₀.₆Sr₀.₄CoO₃-δ material

2020 , Abdullah Abdul Samat , Siti Hajar Alias , Murizam Darus , Mahendra Rao Somalu , Nurul Akidah Baharuddin , Nafisah Osman

A single-phase of perovskite-type oxide material can be prepared at a processing temperature relatively lower than 1000 °C through a sol-gel method. However, it is affected by the nature of chemical additives employed during the synthesis process. In the present work, sol-gel derived lanthanum strontium cobaltite, La₀.₆Sr₀.₄CoO₃-δ (LSC64) material is prepared using various non-ionic surfactants namely polyoxyethylene (10) oleyl ether (Brij-97), polyoxyethylene octyl phenyl ether (Triton-X-100) and polyoxyethylene (20) sorbitan monooleate (Tween-80). The prepared powders of the LSC material is subsequently subjected to the thermal decomposition, phase formation and microstructure analysis by a thermal gravimetric analyzer, an X-ray diffractometer and a scanning electron microscope (SEM), respectively. The as-synthesized powders are calcined at different temperatures based on the thermal gravimetric analysis results. X-ray diffractometer results reveal that all of the calcined powders consist of more than 90 % perovskite phase of LSC64 and other secondary phases such as cobalt oxide, lanthanum oxide and strontium carbonate. The Brij-97-based and Tween-80-based calcined powders have morphology of typical clump-like network structure, while the Triton-X-100-based calcined powder has morphology of flake-like network structure.

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Preliminary Study of Hydrothermal Synthesis of TiO2-GO Composites as a High Performance Photocatalyst

2020-11-24 , Noor Azira Mohd Noor , Murizam Darus , Dewi Suriyani Che Halin , Muhammad Asri Idris , Yunos N.F.M.

In this study, the addition of graphene oxide (GO) into TiO2 was investigated. GO was prepared by modified Hummer method before it was added into TiO2 via hydrothermal method. The graphite and GO was characterized by Raman spectra, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM) along with the TiO2-GO composites also have been characterized. The morphology of TiO2 deposited on the surface of the GO sheet was observed by SEM. the phase formation of anisotropic anatase (TiO2) of the TiO2-GO was detected in XRD. The photocatalytic activity was determined by calculating the photodegradation efficiency of methylene blue (MB) under UV light irradiation. The photodegradation of MB were increased with time for TiO2-GO compared to pure TiO2. The results indicated that TiO2-GO composites was successfully produced using hydrothermal method for the photocatalytic application.

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