Green -cyclodextrin-based corrosion inhibitors: Recent developments, innovations and future opportunities

beta-Cyclodextrin-based compounds are used to develop and innovate materials that protect against corrosion due to their sustainability, low cost, environmental friendliness, excellent water solubility and high inhibition effi-ciency. However, corrosion potentials of beta-CD-based compounds were not reviewed with the modern trends. The essence of the problem is that a deep understanding of the development and innovation of beta-CD-based com-pounds as corrosion inhibitors is very important in creating next-generation materials for corrosion protection. In this review, the fundamental behaviour, importance, developments and innovations of beta-CD modified with natural and synthetic polymers, beta-CD grafted with the organic compounds, beta-CD-based supramolecular (host-guest) systems with organic molecules, polymer beta-CD-based supramolecular (host-guest) systems, beta-CD-based graphene oxide materials, beta-CD-based nanoparticle materials and beta-CD-based nanocarriers as corrosion inhibitors for various metals were reviewed and discussed with recent research works as examples. In addition, the corrosion inhibition of beta-CD-based compounds for biocorrosion, microbial corrosion and biofouling was reviewed. It was found that (i) these compounds are sustainable, inexpensive, environmentally friendly, and highly water-soluble and have high inhibition efficiency; (ii) the molecular structure of beta-CD makes it an excellent molecular container for corrosion inhibitors compounds; (iii) the beta-CD is excellent core to develop the next generation of corrosion inhibitors. It is recommended that (i) beta-CD compounds would be synthesized by green methods, such as using biological sustainable catalysts and green solvents, green methods include irra-diation or heating, energy-efficient microwave irradiation, mechanochemical mixing, solid-state reactions, hy-drothermal reactions and multicomponent reactions; (ii) this review will be helpful in creating, enhancing and innovating the next green and efficient materials for future corrosion protection in high-impact industries.