Wei Lun Ang

Wei Lun Ang
Universiti Kebangsaan Malaysia | ukm · Centre for Sustainable Process Technology (CESPRO)

PhD Chemical Engineering

About

70
Publications
20,008
Reads
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2,558
Citations
Citations since 2016
66 Research Items
2508 Citations
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
Additional affiliations
January 2017 - present
The National University of Malaysia
Position
  • Professor (Associate)
January 2017 - present
The National University of Malaysia
Position
  • Professor (Associate)
Education
October 2012 - May 2016
The National University of Malaysia
Field of study
  • Chemical Engineering

Publications

Publications (70)
Chapter
Nanohybrid based polymeric membranes technology for water purification and separation have grown over the years associated to its advancement in the past decades and remarkable impact to the membrane characteristics and performance is encouraging. In this chapter, the progress of the nanohybrid based polymeric membranes for water-based application...
Article
Full-text available
Sugar molasses from agricultural waste could be a sustainable carbon source for the synthesis of graphene adsorbent introduced in this work. The sugar molasses was successfully converted to graphene-like material and subsequently coated on the sand as graphene sand composite (GSC), as proven by XRD, XPS, Raman spectroscopy, and SEM with EDX mapping...
Preprint
Waste cooking oil (WCO) appears to be a potential carbonaceous source for the synthesis of graphene sand composite (GSC) adsorbent in removing pollutants. This study presents a green synthesis method of GSC using WCO as a sustainable carbon source for the synthesis of GSC through the thermal graphitization method. Characterization analysis conducte...
Article
Exponential increase of greenhouse gases has raise a global concern. More than a quarter of the greenhouse gases (e.g. carbon dioxide) are released from the transportation sector driven by the burning of vehicle fuel. Biofuel was introduced to limit the emission of greenhouse gases due to its potential to cut the emissions by up to 86 %. Microalgae...
Article
In this work, we develop superhydrophobic ceramic surfaces possessing flower-like hierarchical structures that can resist surface wetting against not only water but also ethylene glycol and palm oil. This can benefit a wide range of potential applications in many ceramic fields. The synergistic strategy to fabricate superhydrophobic ceramic surface...
Article
In this study, the impact of urine diversion on the treatment capacity, treatment process, and capital costs of a decentralised wastewater treatment plant (WWTP) was simulated using BioWin. The data for simulation including for economic analysis were obtained from a real decentralised WWTP at Sydney. Simulation was conducted for two alternative pro...
Article
The combination of electrochemistry and ultrasonic irradiation (sonoelectrochemistry) has gained increasing attention in recent years as a method for removing dissolved pollutants from water. This interest stems from the potential for sonoelectrochemical approaches to completely mineralise dissolved pollutants, converting them into harmless mineral...
Article
Full-text available
Poor performance of students in Engineering Mathematics can be overcome by introducing innovative way in teaching. Teaching Engineering Mathematics via lab has been proven to boost the students’ performance in Engineering Mathematics. Thus, the objective of this study is to conduct a pilot test to evaluate students’ knowledge prior to introducing l...
Article
Full-text available
Students grade in a subject is determine mainly from the final examination marks. The final exam questions need to be reliable in order to measure the performance of students in the particular subject. Rasch model able to measure the reliability of an instrument, the final exam questions. A total of 60 students from the School of Information Techno...
Article
Full-text available
Engineering Statistics is one of Engineering Mathematics subject which is common for all the engineering courses besides Vector Calculus, Linear Algebra, Differential Equations and Numerical Analysis. Students performance in Engineering Statistics subject can be evaluated examining through the final exam questions. Students need to understand the c...
Article
Full-text available
Numerical Analysis is one of the key topics for Computational Mathematics in Engineering Mathematics. Students required to learn different methods of analysis to solve a given problem. The objective of this paper is to analyze the final exam questions of Numerical Analysis subject. There are four course outcomes for the Numerical Analysis subject....
Article
Full-text available
Students grade in a subject is determine mainly from the final examination marks. The final exam questions need to be reliable in order to measure the performance of students in the particular subject. Rasch model able to measure the reliability of an instrument, the final exam questions. A total of 114 students from Mechanical Engineering departme...
Article
Full-text available
The Conceive-Design-Implement-Operate has been globally recognized as an enabler for engineering education reformation. With the CDIO process, the CDIO Standards and the CDIO Syllabus, many scholarly contributions have been made in curriculum reform and learning environments. Therefore, CDIO approach recognizes that the engineering education can be...
Article
Full-text available
A life cycle assessment of anaerobic-treated palm oil mill effluent (POME) was conducted to assess the environmental performance on two integrated treatment processes: the typical hollow fiber membrane ultrafiltration module coupled with adsorption and electro-oxidation as pretreatment. The analysis was undertaken using the ReCiPe 2016 method and S...
Article
Nanofiltration (NF) membrane has been applied for the treatment of wastewater owing to its unique features such as higher selectivity towards divalent/polyvalent ions while allowing permeation for monovalent ions and small molecules of less than 100 Da. Thus, the use of NF in wastewater treatment is promising for water recycling, reuse, and recover...
Article
Full-text available
The present study systematically investigated the influence of synthesis conditions (duration, reaction medium, and doping concentration) and formation mechanism of carbon dots (CDs) derived from low-cost and abundant biomass palm kernel shell (PKS). Surprisingly, the dopant (urea) did not enhance the photoluminescence of CDs as expected, which cou...
Article
Membrane technology has evolved to be one of the main filtration processes in various water/wastewater treatment applications. The success of the treatment process lies on the improved properties of membranes, notably water permeation, solute rejection, and antifouling capabilities. Over the past decade, hyperbranched macromolecules that comprise s...
Article
The saline wastewater from various sources including agriculture and industrial activities, appears to have high salt concentration, organic content and other pollutants which can harm the environment. Thus, saline waste-water treatment has become one of the major concerns in many countries. Membrane technology offers great potential in saline wast...
Article
The present work demonstrates the coupling of titanium dioxide, TiO2 nanoparticles (TNP) with N-doped, Bi-doped, and N–Bi co-doped rice husk-derived carbon dots (CDs) via a facile dispersion method, forming respective photocatalyst composites of CDs/TNP, N-CDs/TNP, Bi-CDs/TNP and N–Bi-CDs/TNP. Characterization analyzes verified the successful incor...
Chapter
Various organic and synthetic polymers are important materials for the removal of organic and inorganic pollutants from wastewater and the separation of gases. The book discusses various types of membranes for microfiltration, ultrafiltration, nanofiltration, reverse osmosis, forward osmosis etc. A number of nanomaterials are available for the modi...
Article
Full-text available
Linear Algebra, the common Engineering Mathematics subjects contains abstract concepts that students find it difficult to understand. This study aimed to identify the specific difficult course outcomes or difficult topics for the Linear Algebra subject. The difficult course outcomes are identified from a pre-test which was given to hundred Electric...
Article
Full-text available
In this study, hematite graphene oxide (αFe2O3-GO) powder nanocomposites and thin-film hematite graphene oxide (αFe2O3-GO) were synthesized for application in the removal of Rhodamine B (RhB) from textile wastewater. αFe2O3-GO nanomaterials were placed onto the FTO substrate to form a thin layer of nanocomposites. Different analysis including XRD,...
Article
Full-text available
Oil palm fronds (OPF) is one of the largest biomass sources in Malaysia that has been underutilized. In this work, OPF has been used as a precursor to synthesize carbon dots (CDs) via microwave irradiation method. The impacts of irradiation power and duration and the reacting solution have been investigated. It was discovered that CDs with the high...
Article
Full-text available
Fertilizer-drawn forward osmosis (FDFO) is a potential alternative to recover and reuse water and nutrients from agricultural wastewater, such as palm oil mill effluent that consists of 95% water and is rich in nutrients. This study investigated the potential of commercial fertilizers as draw solution (DS) in FDFO to treat anaerobic palm oil mill e...
Article
In this study, heteroatoms doped carbon quantum dots were synthesized using rice husk as a biowaste precursor. The effects of nitrogen and bismuth doping are investigated by adjusting the amount of ethylenediamine (EDA) as the nitrogen source, and bismuth nitrate pentahydrate as the bismuth source. HRTEM analysis depicted the formation of spherical...
Article
The present research aims to study the long-term impacts of soil extractable carbohydrate content from the conversion of forest to paddy field, using three environmentally friendly methods: ultrasound assist (37 Hz/ 30 min), hot water (80°C/ 4 h), and cold water (25°C/ 30 min). Soil samples collected at the depth of 0 - 15 cm from natural forest, r...
Article
The hydrophobic property of polymeric membrane is one of the major issues in water treatment application as it leads to a lower membrane efficiency and performance during separation process. Hence, a mixed-matrix membrane (MMM) that incorporates polymeric substance, natural additive and nanomaterial could be adopted to resolve this issue. This stud...
Article
Acceleration in global industrialisation has led to increasing release of various emerging, highly toxic refractory organic pollutants in water bodies. These contaminants have been very concerning due to their detrimental impacts on human beings as well as aquatic life even at low concentrations. Conventional wastewater treatment technology has pro...
Article
Water pollution is a growing issue which requires various treatment technologies for efficient and effective remediation. Adsorption is one of the dominant wastewater treatment technologies due to its flexible operation and cost effectiveness. Recently, a new class of adsorbents with multiple functionalities has appeared. They are capable of removi...
Article
Carbon capture and storage (CCS) technologies have gained global attention due to the environmental impact caused by CO2. Ionic liquid, also known as a designer solvent, has good potential for CO2 capture application due to its good CO2 affinity, negligible vapor pressure and high thermal stability. The combination of ionic liquid and membrane tech...
Chapter
Integrated and hybrid water/wastewater treatment processes are required to deliver the desired product water quality and prevent harmful substances from passing to the environment and consumers. The drivers toward hybrid/integrated water/wastewater treatment include resource recovery and consumption, performance optimization, reduction of the physi...
Chapter
The selection of wastewater treatment (WWT) processes is normally the result of design based on technical and economic criteria. Attention should also be given to the complexity of other issues associated with the WWT plant (WWTP), such as greenhouse gas emissions, energy consumption, and land use (construction of the plant and landfill of sludge),...
Article
Full-text available
Graphite from different sources has significant influence on the properties of graphene oxide (GO) and reactivity of GO towards further modification with other nanoparticles. However, such effect has not yet been properly explored. This study aims to investigate the characteristics and antimicrobial property of GO decorated with silver nanoparticle...
Conference Paper
Membrane technology has emerged as an alternative to conventional water treatment methods. Membranes, however, are exposed to fouling phenomena during their application. These have contributed to short membrane durability and higher operating cost. Improvements of commercial membrane characteristics and developing new membrane materials, thus, are...
Article
Full-text available
In the present work, palm kernel shell (PKS) biomass waste has been used as a low-cost and easily available precursor to prepare carbon dots (CDs) via microwave irradiation method. The impacts of the reacting medium: water and diethylene glycol (DEG), and irradiation period, as well as the presence of chitosan on the CDs properties, have been inves...
Article
Graphene oxide is a very high capacity adsorbent due to its functional groups and π−π interactions with other compounds. Adsorption capacity of graphene oxide, however, can be further enhanced by having synergistic effects through the use of mixed-matrix composite. In this study, silica-decorated graphene oxide (SGO) was used as a high-efficiency a...
Article
In this work, functionalized CQDs have been synthesized from rice husks through hydrothermal process by varying the amount of Ethylenediamine (EDA) and ascorbic acid as sources of amine group and carboxyl group, respectively. HRTEM images show the formation of functionalized CQDs with sizes less than 10 nm. XRD analysis shows that CQDs have graphit...
Article
Full-text available
Fresh Clinacanthus nutans ( C. nutans ) leaves were dried using a heat pump dryer where the effects of drying temperature (40, 50, and 60°C) and air velocity (2.5, 3.0, and 3.5 m/s) on the drying characteristics and product quality were investigated. Data showed that higher air temperature and velocity resulted in a shorter drying duration. At high...
Article
Natural coagulants have shown its coagulation efficiency as reported in a substantial number of research articles. However, the acceptance and widespread application of natural coagulants in water industry is still low. It is necessary to conduct a review to boost the potential of using natural coagulants by highlighting the current development and...
Article
Study of forward osmosis (FO) has been increasing steadily over recent years with applications mainly focusing on desalination and wastewater treatment processes. The working mechanism of FO lies in the natural movement of water between two streams with different osmotic pressure, which makes it useful in concentrating or diluting solutions. FO has...
Article
Full-text available
Engineering Mathematics expecially Vector Calculus, Linear Algebra and Ordinary Differential Equations has been vital courses in all engineering curriculum. Lack of fundamental knowledge of Engineering Mathematics will reflect badly on the students" performance when they are unable to grasp higher level of other engineering subjects. Thus the objec...
Article
High demand for palm oil results in the production of huge quantities of palm oil mill effluent (POME) wastewater containing a high amount of organics. Currently, this is often processed by anaerobic digestion, but the waste water still requires further processing. Dewatering of POME digestate could simultaneously recover nutrients for use as organ...
Article
This study investigated the effect of temperature (40, 50, and 60 °C) and sample mass (100, 200, and 300 g) on the drying characteristics and product quality of Roselle calyx using heat pump dryer. It was observed that higher drying temperature and lower sample mass led to a shorter drying time (faster drying rate). Higher temperature supplied more...
Article
Issues of water scarcity and water security have driven the rapid development of various technologies to ensure water sustainability. The forward osmosis (FO) membrane process has been widely recognized as one of the more promising technologies to play an important role in alleviating the issues of water sustainability. Extensive research has been...
Article
Full-text available
Nanomaterials can be incorporated in the synthesis of membrane to obtain mixed-matrix membrane with marked improvement in properties and performance. However, stability and dispersion of the nanomaterials in the membrane matrix, as well as the need to use high ratio of nanomaterials for obvious improvement of membrane properties, remain a major hur...
Article
Full-text available
Palm oil mill effluent (POME) poses a great threat to the environment. However, it contains valuable resources such as energy, water and nutrients that could be recovered for sustainable development. Currently, anaerobic digester has been employed to recover the energy potential in POME. However, the presence of suspended solids in the digestate hi...
Conference Paper
Full-text available
Oil palm industry contributes significantly to the economic growth in Malaysia. At the same time, it generates a huge amount of palm oil mill effluent (POME) which contains valuable resources for energy, water and nutrients recovery. Currently, it has been used as feed for anaerobic biogas reactor to produce methane, a renewable energy source. The...
Article
Full-text available
Palm oil mill effluent (POME) is a highly polluted wastewater that requires proper treatment before it can be safely discharged to the environment. Presently, the effluent is treated with a closed anaerobic digester tank which is used to entrap methane gas prior undergoing downstream treatment. The digestate discharged from the tank contains abunda...
Article
Full-text available
Membrane fouling is the major challenges that hinders the widespread application of membrane bioreactor (MBR). Recently, application of electricity in electrically-enhanced MBR (EMBR) to suppress membrane fouling has gained much attention among research communities. This paper presents an overview of developments on EMBR for fouling suppression in...
Article
Full-text available
In order to minimize the adverse impacts of palm oil mill effluent (POME) towards the environment and to cope with the stress associated with water scarcity, membrane technology has been employed to reclaim water from POME. This study investigated the performance and fouling propensity of membranes in treating tertiary POME with the aim to recycle...
Article
Membrane selection is a crucial step that will affect the economic feasibility of the membrane water treatment process. A comprehensive evaluation consisting of Verberne Cost Model, assessment of membrane performance and fouling propensity, osmotic pressure differential (OPD) and specific energy consumption (SEC) was employed to determine the poten...
Article
Membrane process is considered an effective and economical treatment technology to palm oil mill effluent (POME) which is a major pollution source discharged from the palm oil industry. In this study, graphene oxide (GO) and oxidized multi-walled carbon nanotubes (OMWCNTs) were used as nano additive in coagulation bath to prepare polyvinylidene flu...
Article
Water treatment industries are exploring the possibility to use environmental friendly chemicals and to discover the potential of advanced treatment technology in order to achieve sustainable development. Hybrid coagulation-membrane process has been introduced and proven to be a reliable water treatment process. In this study, the potential of chit...
Chapter
Membrane has been widely accepted and proven to be a reliable technology in producing drinking water because it offers several advantages compared to conventional water treatment processes. Mathematical modeling is very important in membrane operations for water treatment because it could provide useful data in designing the plant and helpful predi...