Ng Qi Hwa
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Preferred name
Ng Qi Hwa
Official Name
Ng, Qi Hwa
Alternative Name
Ng, Q. H.
Qi, Hwa Ng
Ng, Qi H.
Main Affiliation
Scopus Author ID
54413018300
Researcher ID
A-9192-2019

Research Output
Now showing 1 - 3 of 3
  • Publication
    Recent advancements in smart materials for the removal of organic, inorganic and microbial pollutants in water treatment: a review
    (Elsevier, 2025-02)
    Soon Wah Goh
    ;
    Ng Qi Hwa
    ;
    Siti Kartini Enche Ab Rahim
    ;
    Siew Chun Low
    ;
    Hoo Peng Yong
    ;
    Ryan Yow Zhong Yeo
    ;
    Thiam Leng Chew
    ;
    Zeinab Abbas Jawad
    As the expeditious urban and industrial expansion, a substantial portion of wastewater is produced annually, posing a significant threat to environmental contamination and dwindling the availability of clean water resources. Water contaminants are generally categorized into organic, inorganic, and microbial pollutants. This escalating water pollution crisis has initiated the research community to innovate novel, effective and economical cost methods for water treatment applications. Among the approaches, adsorption has been marked by its importance in water treatment. Recent advancements in the field have focused on developing smart adsorbent materials capable of modifying their physicochemical properties in response to various external stimuli (light and magnetic field) and internal stimuli (thermal and pH fluctuation). The exploration of smart materials has captivated the interest of researchers worldwide and opened up exciting avenue for more efficient water treatment outcomes towards removing different types of pollutants. Notably, these smart materials demonstrate high pollutant uptake and release efficacy when responding to specific stimuli changes, ensuring efficient removal of contaminants and exerting self-cleaning properties. Such materials offer an environmentally benign advantage by eliminating the need for toxic organic solvents during regeneration. The review compiles and highlights the characteristics and performance of several stimuli-responsive smart materials, including thermal, light, magnetic and pH regarding organic, inorganic and microbial pollutants removal efficiencies. A particular focus is given to multi-stimuli responsive materials in environmental applications that represent the modern era and transformation of water treatment methodologies, followed by a discussion on the challenges and prospects of this particular research area.
  • Publication
    Advanced dual-wetting membrane for enhanced COâ‚‚ capture: asymmetric hydrophobic and COâ‚‚-philic thin film in membrane gas absorption
    (Korean Society of Industrial Engineering Chemistry, 2025-09)
    Pei Thing Chang
    ;
    Ng Qi Hwa
    ;
    Pei Ching Oh
    ;
    Siew Chun Low
    CO₂ is a major contributor to climate change, making efficient carbon capture essential for emission reduction. Membrane gas absorption (MGA) offers a cost-effective solution, with research often focusing on enhancing membrane hydrophobicity to reduce wettability. However, the potential of CO₂-philic membranes for mixed gas separation remains underexplored. This study addresses the gap by developing asymmetric wetting membranes (PVDF/EDA/GO) with a superhydrophobic side to prevent wetting and a CO₂-philic side to enhance CO₂ capture. The CO₂-philic surface was created by coating PVDF with ethylenediamine (EDA) and graphene oxide (GO). Computational analysis confirmed strong binding energy (−21.07 kcal/mol) between EDA and GO, forming a stable amine complex. The membranes displayed asymmetric wetting, with the CO₂-philic side showing a water static angle (WSA) of 49.6 ± 2.6°, and the superhydrophobic side achieved a WSA of 149.7 ± 3.3° and a water gliding angle (WGA) of 9.8 ± 1.1°. In MGA, these membranes demonstrated improved performance, with a CO₂ absorption flux of 0.0040 mol/m2s and CO₂/N2 selectivity of 6. This work highlights the promise of dual-wetting membranes for enhancing CO₂ capture in MGA systems.
  • Publication
    Development of mixed matrix membranes for gas separations
    (Elsevier, 2020)
    Thiam Leng Chew
    ;
    Lanisha Devi Anbealagan
    ;
    Yin Fong Yeong
    ;
    Ng Qi Hwa
    ;
    Siew Hoong Shuit
    In the last years, development of membrane technology has been gaining interest in the industry due to its simplicity, economical, and environmental benefits. Membrane separation technology has been studied for various industrial applications including air purification and natural gas sweetening. In these processes, membrane technology has proven potential to replace the existing conventional technologies such as absorption, adsorption, and cryogenic distillation. This book chapter describes the development of mixed matrix membranes incorporated with nanofillers and the utilization of them for the gas separation process. It will discuss the factors that affect the membrane separation performance including the selection of polymers and fillers for mixed matrix membranes, the membrane configurations, and the membrane fabrication methods. In addition, the discussion on the effects of different types of nanofillers on the gas separation performance of the mixed matrix membranes will also be provided.
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