Saudi Cultural Missions Theses & Dissertations
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Item Restricted BIOMASS-DERIVED GRAPHENE OXIDE (GO) SUPPORTED - METAL-ORGANIC FRAMEWORK (MOF) POLYANILINE- BASED NANOCOMPOSITE FOR THE REMOVAL OF HEAVY METALS IONS (Pb 2+, Ni 2+) IN WATER(Universiti Sains Malaysia, 2024-09) Alshammeri, Thamer Naif K; Ibrahim, Mohamad; Shahadat, MohamadThe global concern of contamination of heavy metals in water sources is significant. Industrial effluents, which contain pollutants, are released into water sources, hence increasing the probability of heavy metal toxicity in both humans and aquatic organisms. The current investigation focuses on developing a GO/PANI/MOF nanocomposite adsorbent. This nanocomposite is designed to effectively adsorb heavy metal ions (Pb2+ and Ni2+) from synthetic sample. The existence of functional groups, the material's crystallinity property, thermal stability, and surface area, were assessed using several techniques. Specifically, Fourier Transform Infrared Spectroscopy (FTIR) was utilized to identify functional groups, while X-ray diffraction (XRD) was employed to assess the material's crystalline structure, and thermal stability was assessed by thermogravimetric analysis (TGA). Scanning Electron Microscopy (SEM) was used to examine surface morphology. The current study investigated the different physiochemical parameters such as, adsorbent dose, contacting time, heavy metal ion concentration, pH, and temperature influence the adsorption of heavy metal ions. The GO/PANI/MOF-based nanocomposite was employed as an effective adsorbent for removing Pb²⁺ and Ni²⁺ ions. The GO/PANI/MOF-based nanocomposite showed its excellent efficiency at a pH of 6, with a dosage of adsorbent of 50 mg and a starting concentration of metal ions of 60 ppm for Pb2+ and 45 ppm for Ni2+ , respectively, at room temperature (25±2 °C). The equilibrium time required for Pb2+ was 90 min and 120 min for Ni2+. The optimum capacity for adsorption for Pb2+ was determined to be 50 mg/g and 42 mg/g for Ni2+. Furthermore, kinetic, isotherms, and thermodynamics studies were also investigated. This was observed in synthetic water sample. The GO/PANI/MOF nanocomposite has a high capacity for removing heavy metal ions from wastewater, making it a promising option for successful treatment. Keywords: Adsorption, wastewater treatment, GO/PANI/MOF nanocomposite, water pollution.4 0Item Restricted Efficient Removal and Recovery of Phosphate and Ammonium from Wastewater by Redox Flow Deionization Cell(Saudi Digital Library, 2023-12-16) Alkhaldi, Abdulrahman; Zhenmeng, PengWastewater stemming from both residential and industrial sources commonly contains notable quantities of ammonium (N) and phosphate (P). Elevated levels of N and P within wastewater can give rise to significant challenges for aquatic ecosystems and wildlife. Meanwhile, it is crucial to recognize that N and P are valuable resources with diverse applications. This dual role of N and P, both as potential environmental pollutants and indispensable resources, underscores the need for efficient and sustainable approaches to manage and recover these nutrients from wastewater. The initial facet of this study delves into the utilization of the redox flow deionization cell (RFDC) as a new alternative approach for the elimination of N and P from wastewater. RFDC boasts commendable attributes, including heightened energy efficiency, continuous operational capabilities, and concurrent deionization within the ion’s removal channel, coupled with ion concentration within the concentrated channel. The investigation of RFDC performance was conducted, taking into consideration the influence of wastewater concentration and applied cell voltage. This encompassed an appraisal of parameters such as the average salt removal rate, ion removal efficiency, and electrical energy consumption, including both N and P removal experiments. Additionally, the impact of coexisting ions, namely sodium cations (Na+) and chloride anions (Cl-), on N and P removal efficacy was subject to examination. The findings of this study underscore the expeditious removal of N and P within the ion’s removal channel, coinciding with the concurrent concentration of ions within the concentrated channel. Intriguingly, it emerges that N exhibits a heightened selectivity in contrast to the coexisting cation (Na+), while P exhibits considerably diminished selectivity when juxtaposed with the coexisting anion (Cl-). This observation manifests in augmented electrical energy consumption attributable to the concomitant removal of coexisting ions. Consequently, the subsequent facet of the study was embarked upon with the overarching objective of refining the removal selectivity and retrieval efficiency of P. This was actualized through the introduction of pretreated anion exchange resins into the RFDC system, representing a novel methodological innovation. Varied categories of anion resins were subjected to pretreatment and subsequently evaluated within the RFDC system. Furthermore, the study scrutinized the effects of wastewater concentration ratios pertaining to P and Cl- ions, alongside the influence of applied cell voltage on RFDC performance. An array of pivotal performance metrics was computed, encompassing P selectivity, average P removal rate, P removal efficiency, and electrical energy consumption, collectively serving to gauge the efficacy of the process. The discerned outcomes underscore the effectiveness of pretreated anion exchange resins in conjunction with RFDC as a discerning and resourceful modality for the extraction and recuperation of P. Importantly, these findings proffer compelling evidence attesting to the viability of this pioneering technology for integration within the domain of wastewater treatment.51 0