Gordon Mckay

Gordon Mckay
Hamad bin Khalifa University | HBKU · Division of Sustainability

BTech, PhD, DSc

About

607
Publications
210,954
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
38,045
Citations
Citations since 2016
225 Research Items
19510 Citations
201620172018201920202021202201,0002,0003,000
201620172018201920202021202201,0002,0003,000
201620172018201920202021202201,0002,0003,000
201620172018201920202021202201,0002,0003,000
Introduction
Wastewater Treatment Pollutants removal from waters - toxic heavy metals, organics (oil spills, pcpps, dyestuffs, EDCs, pesticides, phenolics, surfactants); Wastewater treatment processes - adsorption, ion exchange, ozonation, advanced oxidation processes, filtration; Water treatment contacting systems design - batch vessel contactors, fixed bed, fluidised beds (2 & 3 phase); Renewable Energy Biomass gasification and pyrolysis Novel Materials - nano, chars, activated carbons, polymers .
Additional affiliations
July 1995 - July 2014
The Hong Kong University of Science and Technology
Position
  • Professor Emeritus

Publications

Publications (607)
Article
Full-text available
Globally, the oil and gas industry produces a large volume of waste in the form of produced water, oil sludge, and flue gases that can pose a negative impact on environment. As such there is a need for the treatment and safe handling of this waste. Although, several techniques have been developed for the treatment of oil and gas industry waste, rec...
Article
Jatropha curcas L. (JCL) is one of the most prominent energy crops due to its superior agronomical traits, where it can grow in non-arable lands and harsh climates with minimal water requirements. A significant number of studies were published on the utilisation of JCL for biofuel production, whereas there are no studies on its use in greenbelt (GB...
Article
Full-text available
Plastic waste comprises 15% of the total municipal solid waste and can be a rich source for producing value-added materials. Among them, polyethylene (PE) and polypropylene (PP) account for 60% of the total plastic waste, mainly due to their low-end and one-time-use applications. Herein, we report reusable oil sorbent films made by upcycling waste...
Article
Graphene aerogels are widely used in the oil–water system as they possess high internal surface area and super-oleophilic properties. However, they tend to absorb water along with oil, and to overcome this problem; surface coatings are generally employed using expensive fluoro-silane compounds. It leads to an increase in production costs and enviro...
Article
Purple non-sulfur bacteria (PNSB) have a strong potential for various bioproduct avenues including single-cell protein (SCP), and production of pigments and polyhydroxybutyrate. However, high substrate and separation costs are major barriers to commercialization. Therefore, this research investigates the integration of PNSB biomass production with...
Article
Full-text available
Contamination with pharmaceutical compounds, especially antibiotics, has become the focus of pollution control studies because of their high toxicity and difficulty in removing from aqueous media. In this study, activated carbon was prepared from Azolla filiculoides (ACAF) and magnetized using Fe3O4; finally, its further stabilization was done usin...
Article
Full-text available
Camel dung (CM) and date stone (DS) are biomass resources that are abundant across the Gulf region and have the potential to produce sustainable renewable fuels and specialty products. Copyrolysis of camel dung with DS is an intriguing research approach to boosting both the production and quality of pyrolysis products, particularly biochar. The cur...
Article
Full-text available
Background: Bioenergy attracts much attention due to the global demand for renewable and sustainable energy resources. Waste biomass feedstocks—date pits, coffee waste, and cow dung—require efficient and environmentally friendly waste-management technologies such as pyrolysis. Fast pyrolysis occurs at fast heating rates (10–100 °C/s), generates hig...
Article
The efficient and sustainable disposal or value addition of waste plastic has of major importance. Recent studies on the char produced via pyrolysis have demonstrated that it is a valuable additive with multiple applications ranging from soil and water amendment, improving agricultural yield, supercapacitors, fuel cells, and in support/catalysts, s...
Article
Full-text available
We report the synthesis of reduced graphene oxide (rGO)-α-Fe2O3 nanocomposite and its application to remove and recover dissolved oil from a high-salinity oil–water emulsion in batch and column/breakthrough setups. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and nitrogen adsorption characterized the synthesized nanocomposite’s stru...
Article
Full-text available
Considering the risk associated with exposure to benzene and toluene in water resources, researchers have been motivated to conduct studies to remove them from aqueous solutions. Thus, by performing the present study, the potential of Fe3O4/zeolite imidazolate framework nanoparticles (Fe3O4@ZIF-8) was evaluated for the adsorption of benzene and tol...
Article
Full-text available
In comparison to other methods, valorising food waste through pyrolysis appears to be the most promising because it is environmentally friendly, fast, and has a low infrastructure footprint. On the other hand, understanding the pyrolytic kinetic behaviour of feedstocks is critical to the design of pyrolysers. As a result, the pyrolytic degradation...
Article
Full-text available
In this study, an empirical model for the pyrolysis of major oil palm wastes (OPW) such as palm kernel shell (PKS), empty fruit bunches (EFB), and oil palm frond (OPF), and their blends is developed. Moreover, the techno-economic feasibility of the wastes is investigated to determine the type of waste that would be suitable for the commercializatio...
Article
Full-text available
The continuing increase in population means an increasing demand for products and services, resulting in huge amounts of waste being discharged into the environment. Therefore, waste management requires the application of new and innovative solutions. One new approach involves converting waste into value-added chemicals and products for use directl...
Article
The first and second Working Group (WG I and II) contributions to the sixth assessment report of the Intergovernmental Panel on Climate Change (IPCC) have confirmed anthropogenic contribution to global climate change and issued severe lethal warnings against the ramifications of climate change. To achieve the objectives of sustainable development a...
Article
Full-text available
Within the frame of this article, briefly but comprehensively, we present the existing knowledge, perspectives, and challenges for the utilization of Layered Double Hydroxides (LDHs) as adsorbents against a plethora of pollutants in aquatic matrixes. The use of LDHs as adsorbents was established by considering their significant physicochemical feat...
Article
Full-text available
Billions of tons of waste are generated annually, with the amount of waste rapidly increasing and its management expected to worsen. Qatar is a small and wealthy country in the Arabian Peninsula that is undergoing enormous economic and urban development. This study presents the results of a systematic literature review on waste management in Qatar...
Article
Full-text available
With ever-growing population comes an increase in waste and wastewater generated. There is ongoing research to not only reduce the waste but also to increase its value commercially. One method is pyrolysis, a process that converts wastes, at temperatures usually above 300 °C in a pyrolysis unit, to carbon-rich biochars among with other useful produ...
Article
Full-text available
Industrial effluents and stormwater runoff pose a significant threat to the environment and public health. Consequently, the water quality guidelines set strict limitations on the heavy metal content due to their toxicity. Among heavy metals, cadmium is one of the most hazardous, and its maximum permissible concentration is 10 μg/L. Therefore, the...
Article
Full-text available
Biomass feedstock is a key sustainable alternative to the finite fossil resources to produce fuels and chemicals. Biomass sources vary from energy crops to a wide range of municipal, agricultural, and industrial wastes. Therefore, it is attracting growing attention due to its wide availability in almost every country worldwide. However, due to the...
Article
Sustainable energy resources are a solution to the increasing energy demand caused by the accelerating population growth and the national development in the emerging countries. Biomass wastes, such as municipal solid wastes, sewage sludge, and agriculture wastes have potential to be converted into energy via thermochemical processing methods - pyro...
Article
Full-text available
The study provides a review of various applications of biomass-derived biochars, waste-derived biochars, and modified biochars as adsorbent materials for removing dyestuff from process effluents. Processing significant amounts of dye effluent discharges into receiving waters can supply major benefits to countries which are affected by the water cri...
Article
Biochar is a highly rich carbonaceous material, which when applied to soil renders numerous benefits to plants and the environment. The role of biochar in agriculture is expected to expand rapidly as the need to protect the climate, manage organic waste, and produce food has risen significantly. Hence, continuous research on the production and appl...
Article
Full-text available
Heavy metal water pollution is a global concern in recent years. Copper is a toxic metal at higher concentrations (> 20 μg /g) and needs to be removed using ion exchanger systems. This study investigates the removal efficiencies of copper by the non-metallic fraction (NMF) waste printed circuit boards (PCBs). The high maximum adsorption capacity of...
Chapter
Full-text available
Cucumber waste from the greenhouse is a nutrient and high cellulose-rich biomass that could potentially be used to produce biochar as a valuable resource. Therefore, this study was conducted to produce biochar from cucumber green waste collected from a greenhouse in Qatar. The green waste was cut into small pieces (5 to 10 cm) for oven drying at a...
Chapter
This chapter presents an overview of the biochar and modified biochar applications as adsorbents for the removal of dyes from effluents. Due to the current water crisis and the predicted vast water-stressed regions of the world, the treatment of the large volumes of colored effluents into receiving waters can provide a significant relief to many co...
Chapter
With the anticipated growth in population to reach 9 billion by 2050, the demand for energy, water, and food (EWF) resources will continue to rise. This has encouraged the deployment of alternative energy sources to limit resource depletion and enhance system efficiency. Biomass is a promising substitute for fossil fuels that can support sustainabl...
Chapter
The study focuses on using agricultural waste-based alternative adsorbents for the remediation of organophosphate pesticide-profenofos from water. Date pits agricultural wastes were used to prepare three types of adsorbents, namely roasted date pits (RODP), activated date pits (ACDP) and nano-activated date pits (NACDP). To determine the efficiency...
Article
Full-text available
This study involved the preparation of magnetized activated carbon (Fe3O4–HSAC) by first activating hazelnut shell waste, followed by coating it by Fe3O4 nanoparticles. The Fe3O4–HSAC thus prepared was evaluated as an adsorbent possessing the potential for fluoride to elimination, under a variety of conditions. From the findings, it is evident that...
Article
Full-text available
The application of biochar in agriculture is a developing means to improve soil water retention, fertility, and crop yield. The present work focuses on biochar preparation from mixed vegetable and fruit wastes, using cauliflower, cabbage, banana peels, corn leaves, and corn cobs. The biochar produced at 400 °C was applied to the soil as an amendmen...
Article
Full-text available
Prior information on the pyrolysis product behaviour of biomass components-cellulose, hemicellulose and lignin is critical in the selection of feedstock as components have a significant influence on the pyrolysis products yield. In this study, the effect of biomass components on the yield of slow pyrolysis products (char, bio-oil and syngas) is inv...
Article
Full-text available
Pharmaceutical products in water, also known as personal pharmaceutical products or PCPPs, are developing contaminants that have the potential to impair human health and the environment in a variety of ecosystems. In this work, waste date stones, a waste product obtained from the seedless dates manufacturing industry, were used to make acid-activat...
Article
Full-text available
The amount of food waste that is generated all over the world is enormous. As food wastes are rich in nutrients and organics, they serve as a potential source for the generation of many value-added commodities and energy. In most countries, food wastes are predominately dumped in open lands or incinerated, along with other combustible materials suc...
Article
Gasification of biomass as energy sources gained much attention due to their potential in generating valuable downstream products. In this study, the production of downstream methanol product using sorption enhanced steam gasification of palm oil wastes is configured through a the Aspen Plus® simulator. The CO2 capture is accomplished by employing...
Article
Full-text available
Understanding the co-pyrolytic thermal behaviour and kinetics of feedstocks is important for the design of pyrolysers. In this study, the pyrolytic degradation of camel dung, date stones, and their blend (1:1 wt.%) has been investigated under non-isothermal conditions using a thermogravimetric analyser. The Coats-Redfern (CR) and distributed activa...
Chapter
The rapid growth of the global economy, combined with the growing demand for energy, environmental degradation from greenhouse gas emissions, and fluctuating fossil fuel prices, have emphasised the importance of renewable sources of energy. Biofuels produced from biomass conversion processes accounts for at least 13% of the gross global energy cons...
Chapter
Countries around the world strive to diversify their energy portfolio with a suitable and sustainable alternative to fossil fuels, whilst achieving the reduction in environmental impacts from released wastes. The co-conversion of biomass wastes and natural gas (NG) has received much attention due to the potential improvement in downstream power and...
Chapter
The intensive use of plastic in modern society has accumulated a significant and damaging quantity of plastic waste. The management of plastic waste is challenging due to its un-degradable nature and increasing polluting impact on land, water, and air systems. Polyethylene terephthalate (PET) is one of the most important plastic types used and cons...
Chapter
Livestock manure is one of the most abundant agro-wastes worldwide. Most of the manures are landfilled or composted to produce fertilizers, which raises concerns associated with the possible pollution of air and contamination of groundwater. Meanwhile, Hydrothermal liquefaction (HTL) is attracting growing attention to valorise wet wastes as an alte...
Chapter
The Middle East and North Africa region (MENA) is the largest global producer of dates, with an annual production of more than 8 million tonnes. The date palm has been an iconic part of this region’s culture since 3000 BC and played a key role in its development over the centuries. Incidentally, date pits account for approximately 10% of the fruit,...
Article
Full-text available
Landfilling is one of the most prevalent waste management strategies on a global scale. However, one major drawback of landfills is the production of highly contaminated leachate which can harm ecosystems and pollute water resources which municipalities depend on. Various treatment options have been explored for treating leachate throughout the yea...
Article
The novel application of a new hybrid method of Geographic Information System (GIS), Multi-Criteria Decision-Making (MCDM) and game theory has been investigated for landfill site selection in Guilan province, which has a temperate and humid climate. The data utilized in the study were mostly obtained from satellite images and local organizations. T...
Article
Full-text available
In this study, graphene oxide (GO) was synthesized using Hummers method. The synthesized GO was characterized using field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) nitrogen adsorption. The analyse...
Article
Full-text available
The objective of the study is to investigate the potential of carbide-derived carbon (CDC) for the adsorptive removal of nonionic t-octylphenoxy poly ethoxy ethanol (TX-100), anionic sodium dodecylbenzene sulfonate (SDBS) and cationic 1-hexadecylpyridinium bromide (HDPB) surfactants from water. The CDC was characterized using TEM, SEM, FTIR, BET, E...
Article
Full-text available
The future of the global environment is at threat due to global warming and climate change primarily driven by greenhouse gas emissions. Bioenergy with carbon dioxide capture and storage/utilisation (BECCS/U) through its CO 2 negative emission capacity is considered a principal component of global mitigation strategies as agreed in the Paris climat...
Chapter
Leachate is a complex mixture of chemicals and pollutants formed in the landfill. This wastewater stream has come into contact with the waste and the biological activity within the landfill, and can cause potentially severe environmental impacts if not managed and treated properly. For the treatment of landfill leachate, various processes have been...
Article
The bi-functional nanoscale catalysts are of growing attention to address environmental problems. The present work successfully fabricated the hexagonal silver delafossite oxide bridged graphene oxide ultrathin nanosheets interfaces (AgFeO2/GO) to target photodegradation of an antibiotic and inactivation of model waterborne pathogens for the first...
Article
The major hurdle to the implementation of wastewater treatment plants' byproducts reuse schemes resides in public's acceptance. This study explores the attitudes of people towards using recycled water and bio-solids generated from oil and gas industries through surveying an ethnically diverse population. Novel to this study is the interaction betwe...
Article
Full-text available
In this work, bimetallic PdxCoy nanoparticles supported on nitrogen-doped reduced graphene oxide catalysts were synthesized and tested for formic acid oxidation as potentially efficient and durable electrocatalysts. Graphene oxide was nitrogen doped through hydrothermal chemical reduction with urea as a nitrogen source. The PdxCoy nanoparticles wer...
Article
Worldwide consumption of energy produced from fossil fuel is forecasted to grow. This trend leads to both environmental pollution and the depletion of fossil fuel resources. Green diesel is a suitable candidate to substitute petroleum based-diesel due to its plentiful raw materials, non-polluting production process, and cost-effectiveness. Green di...
Article
Full-text available
An alternate and sustainable utilisation of camel dung waste has been investigated in this study. The pyrolysis degradation characteristics of camel dung have been investigated using a thermogravimetric analyser and the same has been compared with the gasification decomposition behaviour of the dung. The pyrolysis analyses were performed at heating...
Article
In this work, the sustainable valorisation of camel manure has been studied using thermogravimetric analysis. The gasification tests were performed from ambient conditions to 950 °C at 10, 20, and 50 °C/min under an O2 environment. The TGA data were applied to determine the kinetics of the O2 gasification. Single-heating rate models (Arrhenius and...
Article
Full-text available
In the last decades, phosphate is considered the main cause of eutrophication and has received substantial attention from the scientific community. Phosphate is a major pollutant that deteriorates water quality, which has been increasing in water resources, primarily due to the increasing global population and corresponding activities. Adsorption t...
Article
In recent years, there has been growing awareness that by 2050, many countries will experience critical issues related to water scarcity. The need to recycle/reuse wastewater after pollution treatment is a major concern worldwide for ensuring water security at the national level. Treatment technologies to remove major pollutants, namely, heavy meta...
Article
Full-text available
Information on the pyrolysis degradation kinetics of feedstock is critical for the design and fabrication of pyrolysis reactors. In this study, the pyrolytic behaviour of a novel biomass, camel manure, has been studied in a non-isothermal thermogravimetric analyser. The thermal analyses were performed from room temperature to 950 °C at different he...
Article
Livestock manures significantly contribute to greenhouse gas emissions and soil contamination if not valorised or disposed properly. Meanwhile, hydrothermal liquefaction has emerged as a promising technology for the conversion of wet wastes into value-added products. As such, this study investigates the potential of hydrothermal liquefaction of cam...
Article
Full-text available
Water pollution, from industry and agriculture, is a major threat to water security in the light of decreasing global potable water resources. Adsorption is one potential treatment technology for the removal of different contaminants from polluted water. Hard lignocellulose-containing materials with high carbon content, such as date stones, are exc...
Article
Full-text available
In the last decade, biochar (BC) has attracted significant attention for the removal of pollutants from aqueous solutions. Biochar exhibits many distinctive characteristics that make it an attractive adsorbent due to its availability, low manufacturing cost and compelling surface properties. This review presents a comprehensive summary of BC’s appl...
Article
Sewage sludge is a by-product of the wastewater treatment process, which has the potential to be a source of transport fuels, heat, and power using the pyrolysis process. Considering the prevalence and disposal issues associated with sewage sludge, the objective of this study is to critically review the recent advancements in sewage sludge pyrolysi...
Preprint
Full-text available
Pharmaceutical products in water, frequently referred to as personal pharmaceutical products, PCPPs are regarded as problematic emerging pollutants with the potential to cause damaging health and environmental impacts to several ecosystems. In this study, an acid activated carbon has been produced from waste date stones, the waste product obtained...
Article
Full-text available
The growing anthropogenic greenhouse gas (GHG) emissions combined with the rise of the demand on energy resources has expedited research into sustainable alternatives to fossil fuel. In this context, biomass has increased in popularity and acquired a significant share of the global energy mix in a relatively short time. However, several biomass res...
Article
Full-text available
Large quantities of fruit wastes are generated during the consumption and processing of fruits. The disposal of fruit wastes in an environmentally benign way is a challenging task. The biochar production from fruit wastes by pyrolysis is receiving huge attention because it can alleviate pollution of fruit wastes and provide a supply of biochar sust...