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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

        Gülen Tekin,Gülin Ersöz,Süheyda Atalay 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-

        The study focused on synthesis of BiOI/g-C3N4 heterojunction photocatalysts by various methods toinvestigate their physicochemical properties as well as their performances on photocatalytic treatmentof sugar processing wastewater. The heterojunction catalysts possessed enhanced catalytic activity comparedto the pristine BiOI and g-C3N4. In-situ growth of BiOI on g-C3N4 was determined as the mostpromising method when the pH of the synthesis medium was adjusted to 10. This method provided amore homogeneous distribution and smaller size for the BiOI clusters that formed a unique flower shapewhich enhanced the catalytic activity remarkably. This depicts that synthesis conditions are especiallyimportant to obtain desired physicochemical properties for a photocatalyst since it has a key role inthe crystal structure of BiOI. The optimum nominal weight ratio was determined as 75:25 for BiOI andg-C3N4, respectively by considering the superior morphology and the highest photocatalytic activityfor 45.30% and 23.40% total saccharide (TSC) and total organic carbon (TOC) removal, respectively. Thephotocatalytic mechanism depicted that charge separation in the heterojunction structure was accomplishedvia the new S-scheme and the oxidation of saccharides and intermediates followed differentpathways by reacting with different radicals.

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