Hoo Peng Yong
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Preferred name
Hoo Peng Yong
Official Name
Hoo, Peng Yong
Translated Name
Yong Hoo
Alternative Name
Hoo, P. Y.
Peng, Yong Hoo
Hoo, Pengyong
Main Affiliation
Scopus Author ID
56149784600

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  • Publication
    Facile synthesis of magnetophoretic augmented adsorbent for water remediation
    ( 2024-03)
    Chuan Chuan Lim
    ;
    Ng Qi Hwa
    ;
    Siti Kartini Enche Ab Rahim
    ;
    Hoo Peng Yong
    ;
    Siew Hoong Shuit
    ;
    Sigit Tri Wicaksono
    In this new era of globalization, magnetic adsorbents have gained vast attention from researchers in wastewater treatment applications. In this study, sulphonated magnetic multi-walled carbon nanotubes (S-MMWCNTs) were used to remove methylene blue (MB) from an aqueous solution. The S-MMWCNTs are characterized by various analytical methods to investigate their adsorbent features. Adsorption behaviours of the as-prepared composites affected by solution pH and contact time were systematically studied and discussed. The adsorption kinetic data fit the pseudo-second-order kinetic model well. Moreover, the MB removal efficiency of S-MMWCNTs only drops slightly (~6.5%) after five consecutive adsorption cycles, showing their good stability and recyclability.
  • Publication
    Sulfonated magnetic multi-walled carbon nanotubes with enhanced bonding stability, high adsorption performance, and reusability for water remediation
    (Springer, 2023)
    Lim Chuan Chuan
    ;
    Siew Hoong Shuit
    ;
    Ng Qi Hwa
    ;
    Siti Kartini Enche Ab Rahim
    ;
    Wei Ming Yeoh
    ;
    Hoo Peng Yong
    ;
    Soon Wah Goh
    In view of the simple and rapid conveniency of magnetic separation, magnetic nanocomposites had notably gained attention from researchers for environmental field applications. In this work, carboxylated magnetic multi-walled carbon nanotubes (c-MMWCNTs) and novel sulfonated MMWCNTs (s-MMWCNTs) were synthesized by a facile solvent-free direct doping method. Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, energy dispersive X-ray, vibrating sample magnetometer, and point of zero charge analyses confirmed the successful doping of the Fe3O4 nanoparticles into the functionalized MWCNTs to form MMWCNTs. Besides, the bonding stabilities of both c-MMWCNTs and s-MMWCNTs were compared, and results showed that s-MMWCNTs possessed more substantial bonding stability than that of c-MMWCNTs with significantly less leaching amount of Fe3O4. The adsorption capacity of s-MMWCNTs was higher than that of c-MMWCNTs owing to the stronger electronegativity sulfonic group in s-MMWCNTs. Moreover, the reusability experiments proved that the adsorbent remained consistently excellent MB removal efficiency (R > 94%) even reused for twelve cycles of batch adsorption. The finding of the present work highlights the simple fabrication of novel s-MMWCNTs and its potential to be served as a promising and sustainable adsorbent for water remediation owing to its enhanced bonding stability, high adsorption performance, magnetic separability, and supreme recyclability.
  • Publication
    Effect of Glycerol as plasticizing agent on the mechanical properties of Polyvinyl Alcohol/Banana peel powder blended film
    (Springer, 2023-09)
    Yee Ling Tan
    ;
    Yi Peng Teoh
    ;
    Zhong Xian Ooi
    ;
    Siew Hoong Shuit
    ;
    Ng Qi Hwa
    ;
    Hoo Peng Yong
    ;
    Sim Siong Leong
    ;
    Chong Yu Low
    Nowadays, plastic pollution becomes more serious due to the abundance of petroleum-based plastic bags. Hence, economical viable biodegradable plastic is seen as a viable solution. Polyvinyl alcohol (PVA) can blend with banana peel powder (BPP) to form biodegradable film that can be degraded easily. Different compositions of glycerol (0–2.0 ml) were added to the blend to investigate the mechanical properties of the PVA/BPP blended films. PVA/BPP blended films prepared using the solution casting method were analyzed using attenuated total reflectance spectroscopy (ATR), thermogravimetric analysis (TGA), and biodegradability test. Besides, the mechanical properties of PVA/BPP blended films were analyzed using the tensile test to determine their tensile strength, elongation at break, and elastic modulus. The increment in the glycerol composition was found to decrease both tensile strength and elastic modulus of the blended films. However, the elongation at break increases as the composition of glycerol increases. The tensile strength and elastic modulus of PVA/BPP blended film without glycerol (6.65 MPa, 81.9 MPa) are higher than the PVA/BPP blended films with glycerol (4.318 MPa to 3.616 MPa, 49.99 MPa to 30.14 MPa). Moreover, the elongation at break of the PVA/BPP blended films that contain glycerol (34.27% to 48.31%) is higher than the blended film without glycerol (32.72%). After two weeks of biodegradability test, the PVA/BPP blended films that contain 2 ml of added glycerol have the highest biodegradability (11.55%) among all PVA/BPP blended films. As compared to the tested commercial plastic bag film, the BPP/PVA blended films show better biodegradable performance.
  • Publication
    An insight into the adsorptive, kinetic, and mechanistic behavior of the sulfonated magnetic multi-walled carbon nanotubes adsorbent in the removal of Methylene blue
    (Springer, 2025)
    Chuan Chuan Lim
    ;
    Ng Qi Hwa
    ;
    Siew Hoong Shuit
    ;
    Soon Wah Goh
    ;
    Siti Kartini Enche Ab Rahim
    ;
    Hoo Peng Yong
    A simple and environmentally friendly, facile solvent-free direct doping (FSFDD) approach was employed to synthesize sulfonated magnetic multi-walled carbon nanotubes (s-MMWCNTs) which in turn employed for the eliminating of methylene blue (MB) dye from aqueous solution. While prior studies have emphasized the synthesis and innovation points of s-MMWCNTs, this work delves into the fundamental adsorption behaviors (adsorption isotherm, kinetic, thermodynamic and mechanism analysis) to provide a deeper understanding of the interactions between the adsorbent and methylene blue (MB). The developed s-MMWCNTs were characterized by zeta potential analysis, transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET). Moreover, the characterization of spent s-MMWCNTs by X-ray diffraction (XRD), scanning electron microscope-energy dispersive X-ray (SEM-EDX) and Fourier transform infrared (FT-IR) were carried out to compare their characteristics to the freshly synthesized s-MMWCNTs. Results indicated that the Freundlich isotherm model was the best-fitted model, providing a maximum adsorption capacity of 44.64 mg g− 1. As for the adsorption kinetic studies, the MB adsorption onto s-MMWCNTs was discovered to comply with the pseudo-second-order model. Besides, the thermodynamic results suggested that the adsorption process of MB onto s-MMWCNTs occurred endothermically with spontaneity. Furthermore, the adsorption mechanisms encompassed electrostatic interaction, hydrogen bonding and π–π stacking interaction with the electrostatic interaction as the most salient attractive force in the MB adsorption onto s-MMWCNTs.
  • Publication
    Screening of process parameters to produce Xylanase from Aspergillus niger for secondary bioethanol production
    (IOP Publishing, 2020)
    M Tarrsini
    ;
    Ng Qi Hwa
    ;
    Y P Teoh
    ;
    Kunasundari Balakrishnan
    ;
    W U Ang
    ;
    S H Shuit
    ;
    Z X Ooi
    ;
    Hoo Peng Yong
    In recent years, the biotechnological use of xylanases has grown remarkably. Xylanase is a hydrolytic enzyme with a broad industrial application. In specific, xylanase can convert xylan into xylose, a fermentable sugar source for secondary bioethanol production. The objective on this study is to investigate the significance of different parameter effects for an efficient xylanase production from Aspergillus niger (A. niger). In this study, four factors: incubation temperature, medium pH, incubation time, and agitation speed were screened by performing One-factor-at-a-time (OFAT) analysis. Xylanase production with the maximal enzyme activity was successfully obtained from OFAT analysis under condition of 32°C, pH 5.0, 5 days, and 150 rpm.
      12  1
  • Publication
    Removal of methylene blue using trifunctional magnetic polyethersulfone microcapsule: process parameters and optimization study
    ( 2025-01)
    Suh Cia Yong
    ;
    Siew Hoong Shuit
    ;
    Wei Yang Tan
    ;
    Steven Lim
    ;
    Ng Qi Hwa
    ;
    Hui San Thiam
    ;
    Shiau Foon Tee
    ;
    Kok Chung Chong
    ;
    Hoo Peng Yong
    Water pollution from dye-contaminated effluents poses a critical environmental threat. Current dye removal methods often rely on activated carbon, which is expensive and challenging to recover. This study focuses on the removal of methylene blue (MB), a cationic dye, using trifunctional polyethersulfone (PES)-encapsulated polydimethyldiallyl ammonium chloride-functionalized iron oxide (PDDA-Fe3O4) microcapsules with adsorptive, catalytic, and magnetic properties. The negatively charged PES facilitates MB adsorption through electrostatic interactions, while Fe3O4 enhances Fenton degradation and imparts magnetic responsiveness. Characterization techniques, including Fourier transform infrared spectroscopy and scanning electron microscopy with energy-dispersive X-ray analysis, confirmed the presence of PDDA-coated Fe3O4 and the formation of porous structures and finger-like cavities in the microcapsules. Process parameters such as microcapsule loading (10-30 g/L), MB concentration (10-50 ppm), pH (2-10), contact time (60-240 min), and H2O2 concentration (0.1-1 mol/L) were optimized using response surface methodology with a central composite design. Optimal conditions for MB removal (92.94%) were achieved with 21 g/L of microcapsules, 25 ppm of MB, pH 7, 127 minutes of contact time, and 0.45 mol/L of H2O2. These results demonstrate the efficacy of PDDA-Fe3O4@PES microcapsules for dye removal and suggest their potential for application in industries such as textiles and cosmetics, which generate high volumes of dye-contaminated wastewater.
      12  1
  • Publication
    Removal of methylene blue using magnetic multi-walled carbon nanotubes: process optimization study
    ( 2020-12-18)
    Lim C.C.
    ;
    Shuit S.H.
    ;
    Siti Kartini Enche Ab Rahim
    ;
    Hoo Peng Yong
    ;
    Ng Qi Hwa
    Adsorption is the most common methods used in industry for the removal of dye. In this study, magnetic multi-walled carbon nanotubes (MMWCNTs) was served as adsorbent for the removal of methylene blue (MB). Statistical optimization of the MB removal efficiency via response surface methodology coupled with central composite design was performed and reported. It was observed that all three experimental parameters: adsorption temperature (25-50 C), MB concentration (10-50 ppm) and MMWCNTs dosage (0.01-0.05 g/20mL) were significant in the removal of MB. The optimized conditions of 99.21 % MB removal efficiency can be achieved at adsorption temperature of 38 C, MB concentration of 23 ppm and MMWCNTs dosage of 0.033 g/20mL. The verification of the prediction was performed with 3 repeated experiments and the results were found to be in good agreement with the experimental data with only 0.21 % error.
      22  3
  • Publication
    Optimization of on-site Xylanase production from Aspergillus niger via Central Composite Design (CCD)
    (IOP Publishing, 2020)
    M Tarrsini
    ;
    Ng Qi Hwa
    ;
    Y P Teoh
    ;
    Kunasundari Balakrishnan
    ;
    W U Ang
    ;
    S H Shuit
    ;
    Z X Ooi
    ;
    Hoo Peng Yong
    Xylanases have stimulated considerable interest due to their potential application in several industries, especially in the bioethanol sector. Since the vitality of this enzyme is undeniable, this research is focused on optimization of on-site xylanase production from Aspergillus niger (A. niger). This initiative could reduce the dependence of commercial xylanase. Central Composite Design (CCD) was implemented in the process of xylanase production optimization. Incubation temperature and medium pH were two parameters selected to statistically optimized using Response Surface Methodology (RSM) in order to improve the xylanase production. From the data analyzed by Design of Experiment (DoE), maximal xylanase production was predicted to produce under condition of 32.67 °C and pH 4.56 with desirability of 0.936. A validation test with triplicate was done to verify the predicted result. The maximum enzyme activity of 0.5638 U/mL was obtained from the validation test.
      10  2