“…Among these methods, adsorption using biomass-based biochar [8] and biomass-based activated carbon [9] have been recognized as promising options due to their excellent selectivity, inexpensive, simple operation, high removal efficiency, and environmental friendliness. To overcome the limitations of adsorption, i.e., regeneration and reusability, and to increase the ability of the adsorbent in the dye removal, a hybrid technology such as photocatalytic adsorption has been developed [4] [10]. In this sense, several semiconductor oxides including TiO2 [11], SnO2 [12], and ZnO [13] are normally utilized.…”