A major challenge in the field of dye degradation and its remediation is the scarcity of active catalysts that are inexpensive, easily accessible, suitable for large-scale applications, and able to complete mineralization of dyes. In this regard, an easy, sustainable, scalable, and environmentally benign chemical method has been developed to synthesize four different selective orthorhombic iron(oxalate) capped Fe, Cu, Co, and Mn doped heterobimetallic oxide nanomaterials from the redox reaction between [Fe(ox)–Fe(0)] and the corresponding CuSO4, CoNO3, and KMnO4 in water. The variable band gaps, morphologies, surface charges, and surface areas of the four synthesized materials have been successfully utilized for large scale visible light promoted complete mineralization of various dyes into the corresponding CO2, NO3–, and SO42–. The photodegradation mechanism by taking methylene blue as a representative dye suggested that photogenerated holes and free hydroxyl radicals (OH°) are mainly responsible for it...