Catalysts, Biodegradability, Nanotubes, Optimization, Reactors, Polypropylene, Tubes, Catalysis, Multi wall carbon nanotubes, Carbon sources, Alloy steels, Biodegradation, Scanning electron microscopy, Nickel base alloys, Spectroscopy, Immunoglobulins, Thermogravimetric analysis, Nanomaterials, Electron microscopy, Steel, Raman spectroscopy, Carbon, Waste di...