Faizul Che Pa
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Preferred name
Faizul Che Pa
Official Name
Faizul, Che Pa
Alternative Name
Che Pa, Faizul
Faizul, C. P.
Main Affiliation
Scopus Author ID
55561986800
Researcher ID
AGP-6391-2022

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Thermoelectric properties of Sm doped CaMnO₃ using density functional theory method

2020-09 , Abdullah Chik , Ruhiyuddin Mohd Zaki , Akeem Adekunle Adewale , Faizul Che Pa , Yeoh Cheow Keat

The electronic structure and thermoelectric properties of CaMnO₃ doped with 8% and 17% f block element Sm using first principles calculations and semi-classic Boltzmann theory were presented in this paper. The G-type AFM phase is most stable among five phases for CaMnO3, however, with 8% and 17% Sm doping, these compounds became nonmagnetic phases. CaMnO₃ calculated electronic band structure shows an indirect band gap of 0.523 eV, which is underestimated by the density functional theory (DFT) calculations but the band gap explains the semiconducting behavior. However, with 8% and 17% Sm doping, the electronic bandstructure of these compounds exhibit metallic behavior, with Sm 4f and Mn 3d electrons contributing to conduction band, increasing the magnitude of conductivity for doped compounds. All temperature dependence Seebeck coefficient plots show n-typed conduction for all compound with reduced magnitude of Seebeck coefficient for doped compounds. The temperature dependence thermal conductivity plot shows overall thermal conductivity is reduced in Sm doped compound. CaMnO₃ with 17% Sm doping exhibit much higher ZT of 0.32 at 800 K showing enhanced thermoelectric properties at high temperature and suitability or high temperature energy conversion devices.

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Pengenalan kepada Pemprosesan Fizikal Mineral

2013 , Shahrizam Saad , Faizul Che Pa , Abdullah Chik , Mohamed Faisal, Mohamed Noor

Umum mengetahui kepentingan mineral dan logam dalam kehidupan manusia seharian. Walau bagaimanapun, tidak ramai yang mempunyai pemahaman jelas berkaitan dengan pemprosesan peringkat awal bahan ini. Situasi ini mengilhamkan para penulis buku ini untuk menghasilkan buku Pengenalan Kepada Pemprosesan Fizikal Mineral. Objektif utama penulisan buku ini adalah untuk memperbanyakkan bahan rujukan berkaitan pemprosesan mineral dalam medium Bahasa Melayu bagi kegunaan para pelajar dan masyarakat secara amnya. Pemprosesan mineral adalah satu kaedah yang digunakan untuk pengekstrakan bijih bagi mendapatkan mineral atau logam berharga yang dikenali sebagai konsentrat. Bermula daripada aktiviti perlombongan, bijih yang dilombong seterusnya akan menjalani beberapa peringkat proses untuk memisahkan konsentrat daripada mineral reja. Antara proses-proses yang terlibat adalah proses pengurangan saiz atau kominusi yang melibatkan proses penghancuran dan pengisaran. Proses penyaringan dan pengelasan pula bertujuan untuk mendapatkan taburan saiz yang dikehendaki untuk proses-proses seterusnya. Proses pemisahan konsentrat pula bergantung kepada ciri-ciri fizikal mineral seperti garviti tentu, kekonduksian dan magnetik manakala pemisahan yang bergantung kepada ciri-ciri kimia permukaan mineral pula adalah melibatkan proses pengapungan. Konsentrat yang terhasil daripada proses yang melibatkan pemisahan menggunakan medium air seterusnya akan menjalani proses penyahairan bagi menyingkirkan kandungan kelembapan konsentrat sebelum dihantar kepada pelebur untuk tujuan peleburan.

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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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Overview of activated carbon derived from biomass for heavy metal removal

2020 , Z. Nur Aimi Nadhirah , M. Rabiatul Manisah , Norizah Abd Karim , Faizul Che Pa

Discharge of industrial wastewater containing heavy metals has resulted in serious problems thus effective solution to prevent such pollution is vitally needed. Adsorption technique is a popular method wastewater treatment and studies are focusing on the development of alternative activated carbons derived from biomass as alternative adsorbent with low cost, abundantly available and environment friendly. This paper goes through the treatment of biomass as activated carbon and its application in reducing heavy metals in wastewater. Such technology will reduce the cost of activated carbon production and the cost of biomass disposal as well.

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Effect of reaction temperature on zeolite synthesised from oil palm ash

2023 , Faizul Che Pa , Muhammad Faheem Mohamad Tahir

The zeolite synthesis using silica extracted from oil palm ash (OPA) was carried out under hydrothermal conditions by activation with sodium hydroxide (NaOH) solution. The parameters involved in this study were reaction temperatures (40, 60, 80, and 100 °C), while the solid/liquid ratio, alkali concentration, and reaction time used were 0.2:1, 2 M, and 12 h, respectively. The properties of zeolites synthesised were characterised using X-ray fluorescence (XRF) and X-ray diffraction (XRD). Cation exchange capacity (CEC) values of the zeolite produced were also determined. Phase analysis by XRD shows that zeolite gismondine (CaAl2Si2O8·4(H2O)) was produced after hydrothermal activation of treated OPA.

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Preparation & characterization of biochar from rice husk by pyrolysis method

2024-12 , Faizul Che Pa , Nur Nuha Ulya Norazman , Ruhiyuddin Mohd Zaki

In nations where rice cultivation is prevalent, the responsible management of substantial quantities of rice waste is necessary to mitigate potential environmental concerns. This study aims to produce biochar from rice husks through the pyrolysis method, specifically without using inert nitrogen gas by utilizing a low-oxygen pyrolysis technique. The study employed many experimental parameters, including the process temperature, residence time, and heating rates. The FTIR results revealed a decrease in the stretching of O-H bonds in rice husk biochar at elevated temperatures (500°C), suggesting the degradation and disintegration of cellulose, hemicellulose, and lignin. Various bands associated with hydroxyl, carboxyl, aromatic bonds, amine groups, and other aromatic compounds were observed at lower pyrolysis temperatures. The observed functional group in rice husk biochar closely resembles the outcomes obtained from commercial biochar, except for the absence of C=O stretching. It was seen that the biochar structure exhibited an increase in pore size with increasing temperature. At higher temperatures, a decrease in pore size was observed on the surface of the biochar. It has been observed that when subjected to elevated pyrolysis temperatures, commercial biochar has a greater pore size compared to rice husk biochar, albeit fewer in number than the latter. Based on the findings, it can be inferred that the most favourable conditions for the rice husk biochar production by the low oxygen pyrolysis method are attained at temperatures of 300°C for durations of 60 and 90 minutes, as well as at 400°C for 90 minutes.

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DFT Study of Thermoelectric Performance of SrTiO₃ Doped by Tantalum

2019-10 , Akeem Adekunle Adewale , Abdullah Chik , Ruhiyuddin Mohd Zaki , Faizul Che Pa , Yeoh Cheow Keat , Noorina Hidayu Jamil

This paper deals with enhancement of thermoelectric performance of SrTiO₃ - a perovskite-based material by doping Ti-site with Ta. The electronic and the thermoelectric transport properties of doped SrTiO₃ were studied using the first principle calculation in full-potential of density functional theory. Spin-orbit coupling including Hubbard U parameter influences were observed in the investigation. Energy band structure and electron density of state were determined for electronic properties. The Seebeck coefficients, thermal conductivity, electrical conductivity as well as thermoelectric efficiency ZT were calculated for thermoelectric properties. The results of our calculations revealed that narrowing the bandgap of the material leads to the increase of thermoelectric efficiency ZT. At spin-orbit coupling with DFT+U method, ZT of 0.18 at 750 K were obtained and this is similar to the experimental data reported.

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Investigate the liberation of copper from waste Printed Circuit Boards (PCBs)

2010-06-09 , Mohd Zaheruddin Kasmuin , Aimi Noorliyana Hashim , M. Fazlul Bari , Sri Asliza M. , Faizul Che Pa , Kamarudin Hussin

Nowadays the waste PCBs increasing sharply proportionally the number of personal computers which is 5.7 million in 2005 and the predict amounts, it will be increase to 11.5 Million in 2010 (Unit Perancangan Ekonomi, 2006). From that figure it shows that, computer or Printed Circuit Board (PCB) which is one of the electric and electronic components may cause environmental problems during the waste management phase if it is not properly pre treated. Considering of the environmental problem, recycling of waste PCBs is an important subject not only from the treatment for waste but also from the recovery of valuable materials. The studies are focused on liberation size of copper in waste Printed Circuit Boards (PCBs). Waste PCBs sample were cut, dry crushed and ground down to assemble the criteria of liberation particle size of samples and sieved with the chosen size fraction. Samples were dissolved into aqua regia solution and analyzed with Atomic Absorption Spectroscopy (AAS) to determine the presence of valuable metals in solution that consists in samples. As well, light microscope was used to determine the degree of liberation of copper from PCBs particles. As the result it shows that Cu element (9.97%) is the highest metal composition in PCBs and it is very worth to recycle. At particles size 300 μm, it been seen from microscope that Cu particles start to fully liberated with metal and non-metal element.

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Phase transformation of Kaolin-ground granulated blast furnace slag from geopolymerization to sintering process

2021-03-01 , Noorina Hidayu Jamil , Mohd. Mustafa Al Bakri Abdullah , Faizul Che Pa , Hasmaliza M. , Wan Mohd Arif W Ibrahim , Aziz I.H.A. , Jeż B. , Nabiałek M.

The main objective of this research was to investigate the influence of curing temperature on the phase transformation, mechanical properties, and microstructure of the as-cured and sintered kaolin-ground granulated blast furnace slag (GGBS) geopolymer. The curing temperature was varied, giving four different conditions; namely: Room temperature, 40, 60, and 80â—¦ C. The kaolin-GGBS geopolymer was prepared, with a mixture of NaOH (8 M) and sodium silicate. The samples were cured for 14 days and sintered afterwards using the same sintering profile for all of the samples. The sintered kaolin-GGBS geopolymer that underwent the curing process at the temperature of 60â—¦ C featured the highest strength value: 8.90 MPa, and a densified microstructure, compared with the other samples. The contribution of the Na2 O in the geopolymerization process was as a self-fluxing agent for the production of the geopolymer ceramic at low temperatures.

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Effect of acid leaching on different state of rice husk

2020 , Nur Haslinda Mohamed Muzni , Noorina Hidayu Jamil , Faizul Che Pa , Wan Mohd Arif W Ibrahim

Rice husks (RH) are agricultural wastes available abundantly in rice producing country. A by-product obtained from combustion of rice husk is rice husk ash (RHA) which is rich in silica (SiO2) contents. This paper focused on the effect of acid leaching treatment on rice husk to produce high-purity silica. There are 4 different states of conditions involved; raw rice husk (RRH), treated rice husk (TRH), rice husk ash (RHA), and treated rice husk ash (TRHA). Citric acid; C6H8O7 was used as a leaching agent. TRH and TRHA was leached to see whether treated rice husk before combustion (TRH) or treated rice husk after combustion (TRHA) will produce more high-purity silica. Chemical composition analysis shows high amorphous silica content which is 98.47% with low metallic impurities at 1.0 M C6H8O7, 70 ºC for treated rice husk (TRH). X-ray diffraction (XRD) pattern shows the presence of amorphous silica in treated rice husk (TRH) and crystalline silica in treated rice husk ash (TRHA). Fragmentation of TRH into small pieces after acid leaching is seen where there is significant increase in the exposed surface areas. High-purity amorphous silica with more than 98% was prepared via citric acid leaching treatment and combustion process.

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