Mohd Irfan Hatim Mohamed Dzahir
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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

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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.

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Preparation of supported-deep eutectic solvent membranes: Effects of bath medium composition on the structure and performance of supported-deep eutectic solvent membrane for CO2/N2 gas separation

2020-05-01 , Amira Mohd Nasib , Mohd Irfan Hatim Mohamed Dzahir , Nora Jullok , Mohamad Syahmie Mohamad Rasidi

Polyvinylidene fluoride-co-polytetrafluoroethylene, PVDF-co-PTFE polymer was used as a membrane support. The asymmetric membranes were formed by immersion of casted membrane film into the coagulation bath. This work manipulated the coagulant bath medium by mixing ethanol with distilled water at different weight percentages (0, 25 and 50 wt. % of ethanol). The structures of fabricated membranes were observed to have different morphologies. Higher ethanol content altered the membrane structure from finger-like to sponge-like structure, and hence differed in membrane porosity. Vacuum-based technique was chosen to impregnate the deep eutectic solvent (DES) into the pores of membrane support. DES was prepared by mixing choline chloride (ChCl) and ethylene glycol at a ratio of 1:3. Scanning electron microscopy (SEM) was used to study the membrane morphology changes while in order to determine the immobilization of DES, energy dispersive X-ray (EDX) analysis was used. The porosity of fabricated PVDF-co-PTFE membrane was determined by means of gravimetric method. Lastly, the membrane separation performance using CO2 and N2 gasses were used to determine the capability of the supported-DES-membrane. The results demonstrated the highest immobilization of DES in supported membrane pores was achieved when combination of 25 wt. % of ethanol and 75 wt. % distilled water was used as a coagulant bath medium. The respective membrane has 74.5% porosity with the most excellent performance of CO2 separation at 25.5 x 103 GPU with CO2/N2 selectivity of 2.89.

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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.

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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.

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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.

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Utilization of Seaweed (Gracilaria sp.) Liquid as Cost-Effective Macronutrients and Micronutrients for Bioethanol Production

2023 , Nur Zatul 'Iffah Zakaria , Ahmad Anas Nagoor Gunny , Mohd Irfan Hatim Mohamed Dzahir , Abdul Aziz Ahmad , Ku Syahidah Ku Ismail , Safa Senan Mahmod , Muhammad Javed , Namdar B.-Yazdi , Md Nabil Ab Adzim Saifuddin

Seaweed liquid waste from filter-squeezed drying process of Gracilaria sp. causes an unpleasant odour to the environment. Although this waste can partially be used as biofertilizer and heavy metals adsorbent, a bigger portion of the waste remains unutilized thus causing a problem to the environment. The present study aimed to utilize seaweed liquid waste as a supplement in fermentation media. To achieve this aim, Saccharomyces cerevisiae as a famous bioethanol producer was used to examine the ability of seaweed liquid to supply macronutrients and micronutrients in the media to produce ethanol. Interestingly, when used as a supplement in the fermentation media to produce ethanol, the liquid boosted ethanol production three folds from 200 mg/L of 2 % glucose alone to 600 mg/L of 2 % glucose in liquid. Additionally, the liquid was able to substitute yeast extract and peptone within YPD media to produce 647.48 mg/L ethanol as compared to only 542.39 mg/L with normal YPD which contains yeast extract and peptone. For that reason, the utilization of seaweed liquid as the supplement in the medium should be considered as an alternative cost-effective media for enhancing ethanol production without the addition of other nutrients.

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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.

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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 %.

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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.

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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.

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