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The present book chapter highlights the potential of Hierarchical Nanostructured 3D Flowerlike BiOX (X=Cl, Br, I) microsphere as a remarkable technology towards the environmental remediation processes of various hazardous and persistent environmental pollutants. The work has emphasized the selected case studies on three-dimensional flowers like structures of Bismuth oxyhalides exclusively. The chapter also summarizes the selective synthesis and characterization domains of bismuth oxyhalides nanomaterials to better understand their assemblies and structures along with specific applications. A significant inside in the key challenges and future prospects associated with this technology has been also included in this chapter. &nbsp

BiOCl nanomaterials have been acknowledged as potential and promising environmental remediation material because of their low costs, low toxicities, and enormous stabilities as well as resourceful photocatalytic activities of various hazardous environmental pollutants including dyes, pesticides, and several other organic pollutants, etc. Several synthesis methods of BiOCl nano-micro structures including physical, chemical and biological methods were highlighted. The various characterization methods for these assemblies including nanowires, nanosheets, nanoflakes, and flower-like structures were reviewed. The review emphasized the various environmental pollutants remediation and degradation abilities of these BiOCl nano-micro structures. BiOCl found to be a remarkable nanomaterial with extraordinary potential in the field of environmental clean-up and remediation technology. &nbsp