Mahmoud M. Abualhaija

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• Ph.D. Environmental Chemistry, University of Liverpool - UK.
• Professor (Associate) at University of Jordan

The chemical speciation of iron in seawater is typically determined by cathodic stripping voltammetry (CSV) making use of ligand competition between an electroactive ligand added to obtain the CSV signal and the natural ligand to determine the complex stability of the natural species. Different procedures differ in the added ligand that is selected...

We determined the concentration of iron- and copper-binding humic substances (Fe-HS and Cu-HS) in estuarine waters along with the concentrations of iron- and copper-complexing ligands (LFe and LCu). Suwannee River humic acid (SRHA) was used as a humic standard. The complex stability of Fe with salicylaldoxime (SA) was calibrated for salinities betw...

While the world continues to tackle the COVID-19 pandemic and its impacts on public health and the economy, among other issues (e.g., the environment), water, as a major component of the environment, has been significantly affected. This research aims to examine the quality and pollution of irrigation water in six selected vital dams in Jordan, in...

Employing sustainable biomaterials obtained from waste biomass and biopolymers provides a very promising method for eliminating organic dyes from wastewater. This study presents a novel adsorbent of modified dragon fruit peels and chitosan, addressing wastewater treatment and environmental waste management. Precisely, a bio-sourced multifunctional...

In Jordan, reclaimed wastewater has become a significant component of water resources due to acute water scarcity and increased water demand for different purposes. The vast majority of the reclaimed wastewater is used for restricted and unrestricted agriculture, with agriculture being one of the main economic activities in the country. The purpose...

This study highlights Al-Wehdah Dam as a sustainable irrigation water source in Jordan’s Yarmouk River Basin, an area increasingly facing challenges due to declining river flows caused by excessive upstream water withdrawals. The methodology provides a comprehensive and detailed map of dams within the Yarmouk Basin, and the water quality index (WQI...

This study aims to synthesize a 4-hydroxybenzaldehyde-functionalized chitosan Schiff base/hydroxyapatite composite (CS-4HBA/HAP) as an advanced polymeric adsorbent. The CS-4HBA/HAP biocomposite was characterized by several techniques: Brunauer–Emmett–Teller (BET) analysis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), an...

This work presents the synthesis of a chitosan-based nanocomposite of crosslinked chitosan-citrate/SnO2 nanoparticles (CTN-CT/SnO2) for methyl blue (MB) dye removal from aqueous solutions. Box-Behnken design (BBD) was implemented to examine the impact of three variables on the adsorption of MB dye: A: CTN-CT/SnO2 dose (0.02–0.08 g), B: pH (4–10), a...

The pursuit of Sustainable Development Goals (SDGs) and the adoption of circular economy principles necessitate innovative approaches to resource management and environmental protection. This study introduces the development of a biomaterial (hereinafter, CTS/MP-OX) derived from chitosan and activated mangosteen (Garcinia mangostana L.) peel using...

Herein, an ionically cross-linked chitosan-oxalate/Al2O3 (CHS-OXA/Al2O3) mesoporous nanocomposite was prepared by modifying the natural macromolecular biopolymer (chitosan, CHS) with a metal oxide nanomaterial (aluminum oxide, Al2O3 nanoparticles) and then using an ionic cross-linking method with oxalate (OXA). The physicochemical properties of CHS...

This study investigates the development of a chitosan-based composite for advanced dye removal applications. The carboxylated chitosan-phthalic anhydride/hydroxyapatite (CTSPA/ HAP) composite was synthesised by integrating chitosan with hydroxyapatite and grafting carboxyl groups via phthalic anhydride. The material’s physicochemical properties wer...

This study aims to develop a sustainable polymeric adsorbent (referred to as CTS/AWLL-NA) of chitosan and nitric acid (HNO3)-modified agricultural waste lettuce (Lactuca sativa L.) leaf for efficient methylene blue (MB) dye removal. The various CTS/AWLL-NA characteristics were characterized using the analytical methods FT-IR, XRD, FESEM-EDX, CHN-O,...

This work developed a Schiff base-chitosan-vanillin/hydroxyapatite (CHI-VAN/HA) composite from natural resources for effective brilliant green (BG) dye removal from aquatic systems. Physicochemical analysis of CHI-VAN/HA was performed via several methods, including BET, XRD, FTIR, and SEM-EDX. The mean pore diameter and total pore volume of CHI-VAN...

This study introduces a novel adsorbent (hereinafter, CHT/OL-CIT) by integrating chitosan and citric acid-modified oleander leaves, demonstrating superior adsorption performance compared to conventional chitosan-based materials. The CHT/OL-CIT adsorbent was used to efficiently absorb organic dye (methylene blue, MB) from aqueous solutions. The Box-...

Herein, a sustainable biomaterial (hereinafter, CTO/MP-SA) of chitosan/chemically modified mango (Mangifera indica L.) peel using sulfuric acid (H2SO4) was produced to be an efficient adsorbent material for dye removal (safranin O, SAF-O) from aquatic environments. The chitosan/biomass composite (CTO/MP-SA) was characterized using elemental analysi...

In the current work, green vegetable waste (lettuce leaves, Swiss chard stems, and cucumber peel) was functionalized using sulfuric acid (H2SO4) and subsequently composited with chitosan to develop a biocomposite (starting now, CHT/GVW-HS) for effectively removing methylene blue (MB) dye from water. The adsorption variables, including CHT/GVW-HS do...

Herein, a sustainable biocomposite, referred to as CH/OTL-HS was prepared by combining chitosan with H2SO4 acid-modified olive tree leaves (Olea europaea). The physicochemical characteristics of CH/OTL-HS were investigated through various methods including CHNS-O, pHpzc, XRD, FTIR, BET, and FESEM. An evaluation was conducted to determine the effect...

In the present work, a polymeric nanocomposite adsorbent of cross-linked chitosan-adipic acid and SnO2 nanoparticles (CS-ADP/SnO2) was created for the adsorption of methyl orange (MO) dye from water. Response surface methodology (RSM) was used to examine how three factors affected the adsorption of the dye MO: time C (10–40 min), pH (4–10), and CS-...

Herein, a biohybrid polymer nanocomposite of carboxylated chitosan- phthalate/SnO2 nanoparticles (CTS-PHA/SnO2) was developed for dye wastewater treatment i.e. removal of basic red 2 (BR2) dye. A study was conducted using response surface methodology (RSM) to analyse the impact of three factors on the adsorption of BR2 dye. These factors were CTS-P...

A novel bionanocomposite of grafted chitosan-phthalic anhydride/Co2O3 nanoparticles (CHT-PHT/Co2O3) was synthesized and used for the elimination of brilliant green (BG) dye from aquatic systems. The CHT-PHT/Co2O3 material underwent several instrumental characterizations including, XRD, BET, FTIR, FESEM-EDX, and pHpzc examinations. The impact of the...

This study targets the development of a sustainable and effective adsorbent (henceforth, CHA/STL-HS) for the removal of methylene blue (MB) by combining chitosan (CHA) with modified sidr (Ziziphus spina-christi) tree leaves (STL) using sulfuric acid (H2SO4, HS). The physicochemical properties of CHA/STL-HS were analyzed using techniques such as FES...

The utilization of polymer-based nanocomposites offers a particularly interesting method for removing organic dyes from waterways. This study aimed to efficient removal of eosin yellow (EOY) dye from aqueous solutions using polymer-based nanocomposite (hereinafter, CHA-CIT/Co2O3 NPs) prepared from crosslinked chitosan-citrate (CHA-CIT) and Co2O3 na...

This article introduces a groundwater vulnerability assessment model that utilises the fuzzy analytic hierarchy process (FAHP) in the Wadi AlHasa catchment, Jordan. The assessment takes into account both geomorphological and hydrogeological variables, employing a comprehensive methodology that integrates various parameters. To evaluate the catchmen...

This paper presents an assessment of the supply and demand of domestic water resources in the Yarmouk River Basin-Jordan over a twenty-year period and a long-term estimate of domestic water use for the coming years through 2030. The basin was selected because of water-related problems ranging from management to water scarcity and overpopulation. Th...

This study was carried out to investigate the influence of population growth on supply, demand, and quality issues of water resources in the Yarmouk River Basin in Jordan for twenty years. The population growth data for the years 1997 and 2017 was derived from four Jordan governorates, i.e., Mafraq, Irbid, Jerash, and Ajloun, as well as for the pop...

This paper investigated the impact of land use/cover changes on the flow of the Zarqa River in Jordan over a period of twenty-eight years. The land use/cover maps were derived using a set of medium spatial images with full scenes for the years 1989, 2002, 2011 and 2017. These images correspond to the river flow data for the same hydrological rainy...

The current study was undertaken to assess the physicochemical quality of the Kufranja dam (KD) surface water in northern Jordan during the summer and winter seasons [2019]. The samples were analyzed for temperature, pH, dissolved oxygen, conductivity, major cations, major anions, and heavy metals. Most of the physicochemical parameters exhibited a...

This study was conducted to evaluate the water quality of King Talal Dam (KTD) in Jordan and its suitability for irrigation purposes based on the measurements of several physicochemical parameters and water quality indices. Surface water was sampled from seven different locations in the dam. The values of electrical conductivity (EC) and total diss...

Water stress and scarcity are becoming a serious threat to economic growth, social cohesion, and political stability. In Jordan, the problem of water scarcity is further excerpted as a result of wide fluctuations in annual rainfall, population growth, urbanization and a dramatic increase in refugees' numbers. All these factors affect the sediment y...

Sediment and water samples were collected from three different sites in King Talal Dam (KTD): site 1 (near the entrance of the dam), site 2 (within the deepest area of the dam) and site 3 (near the outlet point of the dam). Water samples were collected from two depths; surface and near-bottom, during all seasons of the year. Sediment samples were c...

Organic complexation plays a key role in the geochemistry and bioavailability of iron but surprisingly the composition of the organic ligands responsible for the binding of Fe is largely unknown. Likely candidates for the identity of Fe-binding ligands include siderophores (specific Fe-binding compounds produced by bacteria), exopolysaccharides (re...

Here we use cathodic stripping voltammetry with competitive ligand exchange (CLE-CSV) to determine the speciation of Fe in samples from the Mersey River estuary and Liverpool Bay in the presence of salicylaldoxime (SA). Multiple analytical windows (MAWs) were obtained by varying the concentration of SA. Data fittings from individual titrations were...

We determined the concentration of iron- and copper-binding humic substances (Fe-HS and Cu-HS) in estuarine waters along with the concentrations of iron- and copper-complexing ligands (LFe and LCu). Suwannee River humic acid (SRHA) was used as a humic standard. The complex stability of Fe with salicylaldoxime (SA) was calibrated for salinities betw...

Samples of water and sediments were collected from three sites along the main body of King Talal Dam (KTD) in the period between Spring 2007 and Winter 2008. The sites represent the middle point of KTD (site A), its deepest area (site B) and its outlet or intake point (site C). Samples were collected from surface and near-bottom water during four s...