Hazrin Jahidi Jaafar
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Hazrin Jahidi Jaafar
Official Name
Jaafar, Hazrin Jahidi
Alternative Name
Jahidi, H.
Jahidi, Hazrin
Main Affiliation
Scopus Author ID
55143913100

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The effect of silica toward polymer membrane for water separation process

2017-09-26 , Mohd Riduan Jamalludin , Rosli M.U. , Muhammad Ikman Ishak , Khor Chu Yee , Mohamad Suhaimi Shahrin , Ras Izzati Ismail , Lailina N.M. , Leng Y.L. , Hazrin Jahidi Jaafar

The aim of this present work was to investigate the effect of different percentage rice husk silica (RHS) particles composition towards polymer mixed matrix membrane microstructure and performance in water separation process. The polymer membranes were prepared by a phase inversion method using polysulfone (PSf), N-methyl-2-pyrrolidone (NMP) as solvent, distilled water as non-solvent and fixed RHS at 400°C as an additive. The microstructures of PSf/PEG/RHS sample were characterized by performing scanning electron microscope (SEM). The performance was measured by using pure water flux and humic acid for the rejection test. The analyzed result of SEM analysis revealed that the addition of RHS obviously improved the microstructure of the membrane especially at the top and sub layer at the range of 1 until 3 wt. %. This was proven by the pure water flux (PWF) value measured from 114.47 LMH to 154.04 LMH and rejection from value 83% to 96% at this specified range substantially higher than the mixed matrix membrane with synthetic silica. In fact, the presence of RHS particles not only improved the properties and performance of membrane but also possess biodegradable properties which can minimize the pollution and provide a membrane green technology system.

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Pengoptimuman parameter penuangan untuk aloi Magnesium (Mg) sebagai anod korbanan bagi kegunaan bawah tanah

2015 , Hazrin Jahidi Jaafar

Perlindungan katod merupakan kaedah yang digunakan secara meluas bagi mengawal kadar kakisan terhadap bahan berunsur logam di dalam persekitaran bawah tanah yang berair. Pengunaan anod korbanan merupakan antara kaedah perlindungan katod yang sering digunakan. Aloi Mg adalah bahan yang sangat sesuai bagi dijadikan anod korbanan kerana mempunyai kadar keelektronegatifan yang tinggi. Di dalam kajian ini, pengoptimuman parameter penuangan untuk aloi Mg sebagai anod korbanan bagi kegunaan bawah tanah menjadi matlamat utama dalam menghasilkan anod berprestasi yang tinggi. Ujian elektrokimia serta air tanah buatan sebagai medium elektrolit dilakukan bagi menganalisis kecekapan anod, keupayaan kakisan, kadar kakisan dan juga ketumpatan arus kakisan. Setiap sampel aloi Mg yang dihasilkan menggunakan suhu peleburan dan suhu pemanasan acuan yang berbeza. Pemilihan suhu penuangan dan suhu pemanasan acuan yang sesuai dapat memberikan perubahan yang ketara ke atas sifat-sifat aloi. Hasil kajian menunjukkan suhu pemanasan acuan yang tinggi dan suhu leburan aloi yang rendah dapat memberikan penyejukan leburan aloi secara perlahan dan sekata seterusnya dapat menghasilkan struktur ira yang lebih besar.

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Effect of zinc addition on the performance of aluminium alloy sacrificial anode for marine application

2017-09-26 , Khan B. , Rosli M.U. , Hazrin Jahidi Jaafar , Muhammad Ikman Ishak , Muhammad Syamil Zakaria , Mohd Riduan Jamalludin , Khor Chu Yee , Wan Mohd Faizal Wan Ab Rahim , Rahim W.M. , Mohd Al-Hafiz Mohd Nawi

In this work, the effect of zinc addition on the performance of aluminum-based sacrificial anode in seawater was investigated. The parameters used in assessing the performance of the cast anodes are anodic efficiency, protection efficiency and polarized potential. The content of zinc in the anodes was varied after die casting. The alloys produced were tested as sacrificial anode for the protection of mild steel for marine application at room temperature. Factors such as reactivity of zinc particles in the seawater, corrosion activity during the period of experiment, pH of seawater and the electronegativity potential of zinc were collected for analysis. Overall findings shows addition of zinc increases rate of corrosion to the sacrificial anode and the protection offered by the sacrificial anodes measured and collected in PIT shows the seawater react to sacrificial anode and no porosity reaction between the anodes. The microstructure showed the intermetallic structures of β-phase which breakdown the alumina passive film, thus enhancing the anode efficiency.

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