[5] used [PERSON]'s earth augmented with kaolin for the elimination of phenolic compounds from an aqueous stream via adsorption methodology. Moreover, [PERSON] and his co-workers [9] used a modified form of [PERSON]'s earth in combination with a surfactant to improve its adsorption capacity for eliminating acid red 17 dye from wastewater. However, to the best of the authors' knowledge, it has not been applied in its solo form as a photocatalyst for dye removal, especially as a source of the Fenton reaction. Catalysts from raw clay, such as [PERSON]'s earth, could represent environmentally friendly and environmentally benign catalysts that possess many advantages. Such materials are cost-efficient and naturally abundant, in addition to being non-toxic to the environment, and they also possess excellent properties, such as a high surface area. [PERSON]'s earth clay is critical for creating 'OH radical species, and this is achieved by using the elements in [PERSON]'s earth, such as aluminum and iron ions [14]. Such ions react with hydrogen peroxide, and the reaction is initiated by ultraviolet light and then produces hydroxyl radicals. Iron and aluminum ions are formed and react with hydrogen peroxide to form further hydroxyl radicals and elemental ions (Equations (1) and (2)). 'OH radicals are categorized as non-selective species that attack pollutant molecules and strongly oxidize them. Aluminum might initiate the Fenton reaction via the acyclic reaction [15]. A general trend of the aluminum-based Fenton reaction mechanism is the formation of the Al\({}^{3+}\) superoxide complex (Equation (3)) [16]. In this reaction, the aluminum is able to stabilize a superoxide radical (O\({}_{2}^{-}\) anion), and thus, the formed Al\({}^{3+}\) superoxide complex (Equation (4)) is capable of reducing Fe\({}^{3+}\) to Fe\({}^{2+}\). Hence, Fe\({}^{2+}\) could enhance the production of 'OH radicals through the Fenton reaction (Equation (5)) [17; 18]. \[\mathrm{Fe^{2+}+H_{2}O_{2}\ \rightarrowFe^{3+}+OH^{-}+OH^{-}} \tag{1}\]  
\[\mathrm{Fe^{3+}+H_{2}O_{2}\rightarrowFe^{2+}+OH_{2}^{2}+H^{+}} \tag{2}\]  
\[\mathrm{Al(H_{2}O)_{6}^{3+}+O_{2}^{-}\rightarrowAl(O_{2})(H_{2}O)_{5}^{2+}+H_ {2}O} \tag{3}\]  
\[\mathrm{Al(O_{2})(H_{2}O)_{5}^{2+}+O_{2}^{-}\rightarrowAl(O_{2})(OH)(H_{2}O)_ {4}^{+}+H_{2}O} \tag{4}\]  
\[\mathrm{Fe^{3+}+AlO_{2}^{2+}\ \rightarrowFe^{2+}+AlO_{2}^{3+}} \tag{5}\]  
To the best of the authors' knowledge, according to the cited literature, \"Fuller's earth\" has not yet been applied as an oxidation source for pollutant remediation. Traditionally, clay sources are applied as adsorbent materials. Therefore, this investigative study introduces the novel application of Fuller's earth as the elemental source of Fenton oxidation. The goal of the current work is based on altering the traditional Fenton source with the environmentally benign, naturally available, and abundant clay \"Fuller's earth\", which comprises various metals. Such metals lead to Fenton reaction oxidation. The system is applied to mineralize Levafix Dark Blue aqueous effluent as a simulation of textile-effluent-polluted wastewater. The influence of various operating variables, i.e., Fuller's earth and the hydrogen peroxide reagent concentration, the pH of the medium, dye loading, and the temperature of the wastewater are assessed in order to meet the real application requirements.