Mohd Irfan Hatim Mohamed Dzahir
Thumbnail Image
Preferred name
Mohd Irfan Hatim Mohamed Dzahir
Official Name
Mohd Irfan Hatim, Mohamed Dzahir
Alternative Name
Mohamed Dzahir, Mohd Irfan Hatim
Dzahir, Mohd Irfan Hatim Mohamed
Mohamed Dzahir, Irfan Hatim
Dzahir, Mohd Irfan Hatim Mohd
Dzahir, M. I. H. M.
Main Affiliation
Scopus Author ID
36915087100
Researcher ID
ESY-2100-2022

Research Output

Filters

11 1
5 1
11
Reset filters

Settings
Now showing 1 - 10 of 11
  • Publication
    Transport Properties of Evaporative Cooling in a Seashell Packed Bed Cooling Tower
    ( 2020-04-30)
    Syahirah Amir Kusin A.
    ;
    Aishah Afifah Zahari S.
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Afif Mohd Ruslan M.
    ;
    Nabil Adzim M.
    ;
    Omar R.
    ;
    Mohd Sani Jamailudin
    ;
    Radi Wan Yaakub A.
    ;
    Mahmad Puzi S.
    This project was aimed to investigate the transport properties of evaporative cooling using seashell as packing material in a packed bed tower. Cockle shell was used as the packing material, which usually discharged as waste from marine life and fishery industry. The packing section is 15 inch high and filled with seashell which consists of 15 mm to 14 mm of equivalent diameter. The performance of cooling tower using seashell packing is compared to HDPE pipe packing. The results show that seashell packing have higher cooling water range, lower cooling approach and higher cooling tower efficiency than HDPE pipe packing. Meanwhile, cooling water range, R and cooling tower efficiency, e decrease with increasing of water to air ratio, L/G for all circulation rate. The heat transfer coefficient, KaV/L decreases with increasing of L/G ratio with lower circulation rate.
  • Publication
    One-pot synthesis of molecular-imprinted membrane for selective extraction of caffeic acid
    ( 2020-08-01)
    Azalina Mohamed Nasir
    ;
    Noorhidayah Ishak
    ;
    Said M.S.M.
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    This research investigated the capabilities of caffeic acid-imprinted membrane (CA-IM) toward the selective extraction of caffeic acid (CA). A simpler surface-imprinted membrane using poly(vinylidene fluoride) as supporting membrane, CA as the template, ethylene glycol dimethacrylate as the cross-linker, and 4-vinylpyridine as the functional monomer was developed. The characterization of the membrane’s surface after the polymerization process was analyzed with Fourier transform infrared spectroscopy and a scanning electron microscope. Molecular modeling showed a ratio of 1:4 for which template/monomer gave the highest at − 18.09 kcal/mol. This indicates that this ratio can form a stable complex and a greater affinity toward CA. Batch rebinding and kinetics were performed and then followed by isotherm and kinetic adsorption modeling. Our results show that CA-IM fitted with Freundlich adsorption model and kinetic adsorption of CA-IM followed the second-order model. The selectivity experiment indicated that the adsorption capacity (1.497 mg/g), distribution coefficients, KD (1.939), and selectivity of polymers to CA were higher than for gallic acid and vanillic acid for CA-IM when compared to NIM. These results demonstrated that CA-IM is a capable and effective material for the selective adsorption and enrichment of CA compounds.
  • Publication
    Smart self-assembled polymeric-MMT/Moringa Oleifera L. particles by solvent replacement method
    ( 2024-10)
    Rahimah Othman
    ;
    Koh Qi Sheng
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Monisha Devi
    ;
    Siti Pauliena Mohd Bohari
    Obesity, stemming from metabolic syndrome and energy imbalance, is a common health concern characterized by excess energy consumption and fat buildup. Moringa Oleifera L. (MO), known for its anti-obesity properties, is extracted via Soxhlet extraction. MO is extracted using the Soxhlet extraction method. To evaluate the antioxidant properties of MO powder, several analyses were conducted, including the assessment of total phenolic content (TPC), total flavonoid content (TFC), 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) activity, and 2,2-diphenyl-1-picrylhydrazyl (DPPH) activity. The TPC and TFC, DPPH activity, and ABTS activity values were determined to be 386.7 mg GAE/g and 82.33 mg QE/g, 32.86 %, and 49.4 % respectively. To improve drug delivery, the freeze-dried MO powder was encapsulated within a polymeric carrier, poly(-caprolactone) (PCL). Moreover, the incorporation of montmorillonite (MMT) into the MO-loaded PCL nanoparticles enhanced the encapsulation efficiency and drug loading of MO. Nanoprecipitation was employed as a method to produce the nanoparticles, and the effects of four key parameters were studied: the ratio of aqueous phase volume to organic volume (1.5 – 10), stirring speed (400 rpm – 1200 rpm), mass weightage of MO (1 % -5 %), and mass weightage of MMT (2 % - 5 %). Design Expert was utilized for full factorial analysis to assess the impact of these parameters on encapsulation efficiency and drug loading. The optimal formulation was achieved at the ratio of aqueous phase volume to the organic volume of 1.5, stirring speed of 400 rpm, mass weightage of MO at 1 %, and mass weightage of MMT at 5% The expected encapsulation efficiency is 91.33 % and drug loading is 6.49 %.
  • Publication
    Development of hydrophobic polymethylhydrosiloxane/tetraethylorthosilicate (PMHS/TEOS) hybrid coating on ceramic membrane for desalination via membrane distillation
    ( 2021-11-01)
    Tai Z.S.
    ;
    Othman M.H.D.
    ;
    Mustafa A.
    ;
    Ravi J.
    ;
    Wong K.C.
    ;
    Koo K.N.
    ;
    Hubadillah S.K.
    ;
    Azali M.A.
    ;
    Alias N.H.
    ;
    Ng B.C.
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Ismail A.F.
    ;
    Rahman M.A.
    ;
    Jaafar J.
    This study presents a facile approach to produce hydrophobic ceramic hollow fiber membranes (CHFMs) for membrane distillation (MD) desalination using the polymethylhydrosiloxane/tetraethylorthosilicate (PMHS/TEOS) hybrid material. The CHFM was modified via dip-coating with PMHS/TEOS hybrid solution followed by post-coating spinning to facilitate the formation of pores on the coating layer. The effects of ethanol and PMHS concentrations on the coating layer structure and hydrophobicity of the membranes were studied. CHFMs acquired hydrophobic properties after surface modification with the water contact angle values in the range of 108.2° to 124.1°. These membranes showed outstanding direct contact MD (DCMD) desalination performance with salt rejections of >99.98%. A flux of 6.7 L/m2h was achieved by the surface-modified CHFM when treating feed solution with a salinity of 35,000 ppm.
  • Publication
    Potential of 2-amino-2-methyl-1-propanol solution as absorbent for CO2 absorption from biogas
    ( 2021-05-24)
    Rajiman V.
    ;
    Hairul Nazirah Abdul Halim
    ;
    Shariff A.M.
    ;
    Ali U.F.M.
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    Biogas is a source of clean energy that mainly consists of methane (CH4) and carbon dioxide (CO2). However, the presence of CO2 in biogas limits the heating value of the gas. Thus, biogas upgrading is a crucial process for reducing the CO2 content in raw biogas for purified biomethane production. Chemical absorption is a matured technology for CO2 removal process. The selection of chemical solvent with desirable characteristics is a substantial consideration for the effectiveness of the process. In this work, a potential solvent, 2-amino-2-methyl-1-propanol (AMP) was tested for the removal of CO2 from simulated biogas. The absorption process was conducted at different gas flow rates (22.1 kmol/m2.hr and 26.5 kmol/m2.hr) in a packed column at an operating pressure of 2 bars. The performance was evaluated in terms of percentage of CO2 removal along the column. It was found that the CO2 removal performance decreased by about 15 % at higher gas flow rates. Besides, the absorption efficiency of AMP was also compared with a well-established solvent, monoethanolamine (MEA). The experiment substantiated that 30 wt.% MEA effectively captured CO2 with 100 % removal as compared to 30 wt.% and 40 wt.% AMP with only 69 % and 87 % removal. In order to achieve high reaction rate for efficient CO2 removal, the addition of activator to form a blended amine solution with AMP was suggested to accelerate the CO2 absorption performance.
  • Publication
    Ceramic Membrane Distillation for Desalination
    ( 2020-10-01)
    Tai Z.S.
    ;
    Abd Aziz M.H.
    ;
    Othman M.H.D.
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Hashim N.A.
    ;
    Koo K.N.
    ;
    Hubadillah S.K.
    ;
    Ismail A.F.
    ;
    A Rahman M.
    ;
    Jaafar J.
    Membrane distillation (MD) is a thermally driven membranous process and in the recent years, it has received increasing attention in desalination. Generally, polymeric membranes have dominated the MD studies due to their intrinsic hydrophobic properties and high availability. On the other hand, the development of ceramic membranes for MD desalination is developing, gradually replacing their polymeric counterparts due to superior properties in terms of thermal, chemical and mechanical stabilities, as well as potentially longer service terms. This review describes and evaluates the fabrication methods of ceramic membranes as well as discusses the latest discoveries of ceramic membranes for MD desalination. Despite outstanding properties, the efforts in developing ceramic membranes as a replacement for polymeric membranes in MD desalination are meeting challenges and obstacles; hence, in the last part of this article, the current challenges and future research opportunities of ceramic membrane development will also be addressed.
  • Publication
    Non-functionalized oil palm waste-derived reduced graphene oxide for methylene blue removal: Isotherm, kinetics, thermodynamics, and mass transfer mechanism
    ( 2023-01-01)
    Ab Aziz N.A.H.
    ;
    Umi Fazara Md Ali
    ;
    Anis Atikah Ahmad
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Khamidun M.H.
    ;
    Muhammad Faiq Abdullah
    The discharge of colored effluents from industries is one of the significant sources of water pollution. Therefore, there is a growing demand for efficient and low-cost treatment methods. An adsorption process with reduced graphene oxide (rGO) synthesized using a novel double carbonization and oxidation method from the natural precursor of oil palm empty fruit bunch (OPEFB) as adsorbent is a promising approach for addressing the problem. In this study, OPEFB biochar was mixed with ferrocene with a ratio of 5:1 (m/m) and oxidized under nitrogen flow at a temperature of 300 °C for 20 min, which resulted in 75.8 wt% of yield. The potential of the synthesized rGO as an effective adsorbent for dye removal from water and wastewater was explored using methylene blue (MB) as a model. Several factors were investigated, including adsorbent dosage, initial concentration, contact time, and pH, to obtain the optimum adsorption condition through batch studies. The physical and chemical characteristics of the rGO in terms of functional groups, surface morphology, elemental composition, and crystallinity phase were determined through characterization. The nonlinear isotherms were appropriated using several error functions to describe the adsorption isotherm with a maximum adsorption capacity of 50.07 mg/g. The kinetic study demonstrates that MB's adsorption fits the PFO kinetic model and agrees with Bangham's interpretation of pore diffusion. The adsorption mechanism was found to be physisorption on the multilayer heterogeneous surface of the rGO involving π-π interaction, hydrophobic association, and electrostatic interaction. The thermodynamics study showed that the process was spontaneous and exothermic. The mass transfer mechanism study shows that the adsorption is controlled by intraparticle diffusion and involves complex pathways. The study found that the novel non- functionalized rGO could remove cationic dyes from water and wastewater.
      2
  • Publication
    Optimization of Nickel Precipitation and Leaching Process from Simulated Industrial Waste: A Study on pH, Contact Time, and Sulfuric Acid Concentration
    ( 2024-01-01)
    Zulkurnai N.Z.
    ;
    Umi Fazara Md Ali
    ;
    Naimah Ibrahim
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Nor Ashikin Ahmad
    ;
    Zuki F.M.
    The presence of nickel in industrial waste has emerged as a significant environmental concern, predominantly attributed to the plating industry. The significant objective of this study is to optimize the precipitation and leaching method to extract valuable nickel from the waste material. The high concentration of nickel found in the waste makes it a potentially valuable resource. To explore its potential extraction, the precipitation and leaching processes were optimized using a simulated Watts bath solution which is widely employed in the industry. This study focuses on examining the influence of pH, contact time, and sulfuric acid concentration on the extraction of nickel concentration during the precipitation and leaching processes. To develop a prediction model for the process, three models were taken into consideration: quadratic, linear, and 2F1. The quadratic model exhibited the greatest adjusted R2 value, suggesting a superior level of fit in comparison with the linear and 2F1 models. The predicted R2 value of 0.8169 exhibits a satisfactory level of concordance with the adjusted R2 value of 0.9737. The recommended optimal conditions proposed by response surface methodology (RSM) consisted of a pH value of 10.56, a contact time of 16.52 h, and a sulfuric acid concentration of 1.80 M in order to achieve a nickel concentration of 28,415 mg/L.
      1
  • Publication
    Optimization of Nickel Electrowinning from Simulated Watts Bath of Electronics Industrial Waste
    ( 2023-01-01)
    Zulkurnai N.Z.
    ;
    Hua Y.M.
    ;
    Umi Fazara Md Ali
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Naimah Ibrahim
    ;
    Zuki F.M.
    Plating process now has been widely used in the electronics industries for corrosion resistance purpose. One of favorable solution used in nickel-plating process is Watts Bath solution. After several duration of time, the used Watts Bath must be discarded. Due to high amount of nickel concentration inside the Watts Bath, it has been considered as a schedule waste and need a proper disposal process which is expensive. One of reliable methods to dispose and recover nickel from the Watts Bath is by using electrowinning process. The aims of this study are to determine concentration of Watts Bath and to optimize the electrowinning process by using Box-Bhenken Design from Simulated Watts Bath of Electronics Industrial Waste. During this study, the electrolyte concentration, potential applied and contact time were optimized, and the surface morphology of nickel deposited also has been studied. From the result, the concentration of Watts Bath solution is 153 g/L and the removal of 75.04% was obtained under optimized condition which were 0.4 M of electrolyte concentration, 0.4 V of potential applied, and 60 min of contact time.
      1
  • Publication
    Production of fuel grade anhydrous ethanol: A review
    ( 2021-05-24)
    Lee Y.H.
    ;
    Chen C.H.
    ;
    Umi Fazara Md Ali
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    Alcoholic fermentation of fermentable carbon sources like molasses and table sugar using yeast are typical route in producing alcohol particularly known as bioethanol (C2H5OH). The key challenge encountered in bioethanol production process is to eliminate the impurity presence within the bioethanol which mainly water. Distillation is an energy extensive process which commonly used to recover ethanol up to 95% purity due to the presence of azeotropic composition. The distillation will no longer appropriate for further purification once the azeotrope composition has reached. Nonetheless, to be able to use as a viable fuel for gasoline engine or for any other utilizations where the purity is a major concern, further dehydration steps are needed producing an absolute ethanol. Few studies have been investigated on various dehydration methods for producing anhydrous ethanol, including azeotropic distillation, extractive distillation, adsorption, membrane pervaporation, and solvent extraction process. This review offers an insight into currently used technology on the ethanol dehydration methods and the future prospect on the continuous improvement particularly on the process energy requirement and efficiency will be discussed.
      2