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    Catalytic Methods on Wastewater Remediation and Reuse for Circular Economy
    (CRC Press, 2023) Palas, B.; Atalay, S.; Ersöz, G.
    Water is of vital importance for human health and the environment and sustainable development. As population and economy grow, freshwater demand has been increasing rapidly. Water reuse provides an alternative resource to meet the increasing global water demand. Wastewaters may be treated to different qualities to meet specific needs but, to close the requirement gap in human health and sustainable environment, it may be necessary to engage the treatment process in a revised form that shifts from just treatment process to reuse, waste recovery, energy production, etc. Wastewater treatment and reuse are the significant parts of a circular economy due to the sustainable management of the water and the recoverable/convertible materials in the wastewater. The treated wastewater can reduce the gap between the water demand and available water. Wastewater has a substantial potential for further uses including agricultural irrigation, energy harvesting, and sludge reuse. Application of circular economy principles to wastewater treatment processes improves the sustainability of the treatment systems. Catalytic wastewater treatment methods such as advanced oxidation processes and microbial treatment methods increase the reusability of the wastewater by eliminating the complex structured and recalcitrant pollutants effectively. These methods can be applied for simultaneous water remediation and energy generation, contributing to the circular economy through sustainable water use. The advantages of resource, recovery, and reuse can improve the human health and environmental benefits of wastewater treatment while also presenting economic opportunities from energy production, water, and biosolids to meet the operating costs of the systems and thus sustainable environment. © 2024 selection and editorial matter, Sanjay K. Sharma; individual chapters, the contributors.
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    Comparison of synthesis methods for BiOI/g-C3N4 heterojunction photocatalysts and testing their visible light activity in sugar processing wastewater treatment
    (Korean Society of Industrial Engineering Chemistry, 2023) Tekin, G.; Ersöz, G.; Atalay, S.
    The study focused on synthesis of BiOI/g-C3N4 heterojunction photocatalysts by various methods to investigate their physicochemical properties as well as their performances on photocatalytic treatment of sugar processing wastewater. The heterojunction catalysts possessed enhanced catalytic activity compared to the pristine BiOI and g-C3N4. In-situ growth of BiOI on g-C3N4 was determined as the most promising method when the pH of the synthesis medium was adjusted to 10. This method provided a more homogeneous distribution and smaller size for the BiOI clusters that formed a unique flower shape which enhanced the catalytic activity remarkably. This depicts that synthesis conditions are especially important to obtain desired physicochemical properties for a photocatalyst since it has a key role in the crystal structure of BiOI. The optimum nominal weight ratio was determined as 75:25 for BiOI and g-C3N4, respectively by considering the superior morphology and the highest photocatalytic activity for 45.30% and 23.40% total saccharide (TSC) and total organic carbon (TOC) removal, respectively. The photocatalytic mechanism depicted that charge separation in the heterojunction structure was accomplished via the new S-scheme and the oxidation of saccharides and intermediates followed different pathways by reacting with different radicals. © 2023 The Korean Society of Industrial and Engineering Chemistry