Creating sustainable and affordable methods is a never-ending challenge in the photocatalytic degradation of toxic organic pollutants. This chapter elaborates on the basics of photocatalysis as well as advancements achieved in photocatalyst developments for the effective remediation of organic pollutants from water. Advantages of graphene oxide (GO) in particular for enhancing the catalytic performance of photocatalyst based on semiconductor and plasmonic nanomaterials. Due to its large interior surface area and quick electron conductivity, and high optical transmittance, fostering GO as a fundamental foundation of an efficient hybrid photocatalyst. The efficient degradation of organic toxicants is made possible by quick photo-charge separation and delayed charge recombination. This chapter provides an overview of current progress in GO, r-GO, and g-C3N4 hybridized plasmonic and semiconductor materials employed in efficient remediation of organic pollutants under solar radiation. It is also supposed that this chapter will provoke higher level exploration and will definitely attain new possibilities that improve novel hybrid GO, r-GO, and g-C3N4-based plasmonic and semiconductor photocatalysts.