Hairul Nazirah Abdul Halim
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Preferred name
Hairul Nazirah Abdul Halim
Official Name
Hairul Nazirah, Abdul Halim
Alternative Name
Abdul Halim, Hairul Nazirah
Abdul Halim, H. N.
Hairul, N. A.H.
Abdul Halim, Hairul N.
Halim, H. N.A.
Halim, Hairul N.Abdul
Main Affiliation
Scopus Author ID
23388800300
Researcher ID
FYZ-8202-2022

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Amine functionalized carbon-based soybean curd residues (SCR) as potential adsorbent for carbon dioxide adsorption

2021-05-24 , Zakaria D.S. , Siti Khalijah Mahmad Rozi , Hairul Nazirah Abdul Halim , Mohamad S.

Currently, carbon dioxide (CO2) capture can preserve environmental quality by using carbon- based adsorbent. In this research, Polyethylenehexamine (PEHA) functionalized carbon-based soybean curd residues (carbonized SCR-PEHA) was prepared for CO2 adsorption. Analysis of functional groups of the prepared adsorbent using Fourier Transform Infrared Spectroscopy (FTIR), confirmed the functionalization of PEHA on the carbonized SCR. CO2 uptake of the carbonized SCR-PEHA was compared with the bare SCR using Thermogravimetric Analyzer (TGA) analysis. TGA results revealed that the adsorption capacity of CO2 for carbonized SCR-PEHA and bare SCR are 8.816 mg/g and 3.027 mg/g respectively. It was observed that functionalization of the PEHA on the surface of carbonized SCR had improved the adsorption capacity of CO2 by 2.92 times as compared to bare SCR. The phenomenon can be explained from the interaction of the CO2 with the available amine sites provided for the carbonized SCR-PEHA which significantly improved the CO2 adsorption. Hence, the carbonized SCR-PEHA demonstrate potential adsorbent for CO2.

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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.

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An integrated DFT calculation and adsorption study of desiccated coconut waste-based biochar in CO2 environment

2024-01-01 , Rafizah Rahamathullah , Zakaria D.S. , Siti Khalijah Mahmad Rozi , Hairul Nazirah Abdul Halim , Razak F.I.A. , Sapari S.

Abstract: This study presents a new series of amine-functionalized biochar derived from desiccated coconut waste (amine-biochar@DCW) as potential CO2 adsorbents. The CO2 adsorption experiment revealed that TETA-biochar@DCW had the highest adsorption capacity of 61.78 mg/g. Prior to the experimental studies, Density Functional Theory (DFT) was conducted at B3LYP/6-31G (d,p) to evaluate the energy band gap, global chemical reactivity descriptors (GCRD), and molecular electrostatic potentials (MEP) to compare the experimental findings. The results from the simulated data indicate that TETA-biochar@DCW has the lowest HOMO–LUMO gap at 2.7890 eV before adsorption, and it increases after CO2 adsorption occurs. The 3D plots from MEP also show that TETA-biochar@DCW is a reactive adsorbent for CO2 gases. Overall, the theoretical and experimental results of the amine-biochar@DCW suggest its potential as a promising and cost-effective adsorbent for CO2 capture. Highlights: • Newly prepared amine-biochar@DCW was assessed as CO2 adsorbents. • TETA-biochar@DCW presents the highest CO2 capture capacity. • TETA substituents significantly reduce the HOMO-LUMO gap values. • 3D MEP plots confirm the adsorption ability of TETA-biochar@DCW towards CO2 gases. Graphical Abstract: [Figure not available: see fulltext.]

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New porous amine-functionalized biochar-based desiccated coconut waste as efficient CO2 adsorbents

2024-03-01 , Zakaria D.S. , Siti Khalijah Mahmad Rozi , Hairul Nazirah Abdul Halim , Mohamad S. , Zheng G.K.

Climate change caused by the greenhouse gases CO2 remains a topic of global concern. To mitigate the excessive levels of anthrophonic CO2 in the atmosphere, CO2 capture methods have been developed and among these, adsorption is an especially promising method. This paper presents a series of amine functionalized biochar obtained from desiccated coconut waste (amine-biochar@DCW) for use as CO2 adsorbent. They are ethylenediamine-functionalized biochar@DCW (EDA-biochar@DCW), diethylenetriamine-functionalized biochar@DCW (DETA-biochar@DCW), triethylenetetramine-functionalized biochar@DCW (TETA-biochar@DCW), tetraethylenepentamine-functionalized biochar@DCW (TEPA-biochar@DCW), and pentaethylenehexamine-functionalized biochar@DCW (PEHA-biochar@DCW). The adsorbents were obtained through amine functionalization of biochar and they are characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, Brunauer–Emmett–Teller (BET), and thermogravimetric analysis (TGA). The CO2 adsorption study was conducted isothermally and using a thermogravimetric analyzer. From the results of the characterization analyses, a series of amine-biochar@DCW adsorbents had larger specific surface area in the range of 16.2 m2/g–37.1 m2/g as compare to surface area of pristine DCW (1.34 m2/g). Furthermore, the results showed an increase in C and N contents as well as the appearance of NH stretching, NH bending, CN stretching, and CN bending, suggesting the presence of amine on the surface of biochar@DCW. The CO2 adsorption experiment shows that among the amine modified biochar adsorbents, TETA-biochar@DCW has the highest CO2 adsorption capacity (61.78 mg/g) when using a mass ratio (m:m) of biochar@DCW:TETA (1:2). The adsorption kinetics on the TETA-biochar@DCW was best fitted by the pseudo-second model (R2 = 0.9998), suggesting the adsorption process occurs through chemisorption. Additionally, TETA-biochar@DCW was found to have high selectivity toward CO2 gas and good reusability even after five CO2 adsorption–desorption cycles. The results demonstrate the potential of novel CO2 adsorbents based on amine functionalized on desiccated coconut waste biochar. Graphical Abstract: (Figure presented.)

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