Part 1: BASICS and FUNDAMENTALS 1. A preface to the chitosan-biopolymer, its origin, and properties 2. Chitin and chitosan manufacturing and processing techniques 3. Chitosan-based nanomaterials, multiple forms, and characterization 4. Degradability of chitosan nanostructures in the natural environment 5. Functional properties of chitosan-based nanomaterial Part 2: Emerging applications OF CHITOSAN-BASED NANOMATERIALS 6. Chitosan-based nanomaterials in decontamination of industrial products 7. Chitosan-based nanomaterials in decontamination of pharmaceutical products 8. Chitosan-based nanomaterials in decontamination of heavy metals 9. Chitosan-based nanomaterials in decontamination of inorganic species 10. Chitosan-based nanomaterials in decontamination of organic dyes 11. Chitosan-based nanomaterials in decontamination of pesticides 12. Chitosan-based nanomaterials in decontamination of hydrocarbons 13. Chitosan-based nanomaterials in decontamination of phenols and biphenyls 14. Chitosan-based nanomaterials in decontamination of detergents 15. Chitosan-based nanomaterials in decontamination of plasticizers Part 3: CURRENT CHALLENGES AND FUTURE SCOPE 16. Safety, regulations, and economic impact of chitosan nanostructures 17. Eco- and toxicological impact of chitosan nanostructures 18. Current status of chitosan nanostructures in the field of environmental remediation???? 19. Challenges and Future prospects of chitosan nanostructures in environmental remediation