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This lecture covers the principles and applications of semiconductor-assisted photocatalysis for water splitting and pollution remediation. Topics include photo-electrochemical hydrogen generation, Z-scheme tandem converters, and advanced oxidation processes. The instructor discusses the use of semiconductor materials like TiO₂ and WO3 in photocatalytic water decontamination, superhydrophilicity, self-cleaning surfaces, indoor air purification, and photocatalytic biocidal activity.