Citric acid-based cationic surfactants using 1-methyl imidazolium as coordinizing agent has been synthesized and characterized. The cationic surfactants is produced in excellent yields (70%) and has been examined by TGA, FTIR, ¹H NMR and are found to have good surface-active properties. FTIR analysis showed the presence of ester confirmed by ¹H NMR (the chemical shift value of 3.7 ppm and 3.8 ppm is due to the presence of an ester) in the surfactant. The biodegradability confirmed by BOD analysis. It is found that cationic imidazolium surfactants having surface tenstion of (12 mN/m) with chloride as a counter ion. The results show that cationic imidazolium surfactants with longer hydrophobic chains have a lower CMC value. TGA result shows good thermal properties of cationic surfactant. Invitro study of cationic surfactant over fungal cell indicates its antifungal activity (70% inhibition at 350 ppm) and its appliaction as disinfactant.

Chitosan is a polymeric material having properties such as adsorption and hydrophilicity. Chitosan itself is almost photocatalytically inactive, but it can couple with other photocatalysts to improve their photocatalytic activity. Chitosan significantly enhances photocatalysts' adsorption and lowers the charge carrier recombination, which ultimately aids in the enhanced photocatalytic activity. In this review, we have discussed chitosan's basic structural, electronic, and chemical properties. We have also explored the photocatalytic properties of chitosan and chitosan-based materials. Since metal-based and metal-free semiconductors are the two major classes of semiconductor photocatalysts, so we have described how chitosan can be used to enhance the limitations of metal-based and metal-free semiconductor photocatalysts. This review will help to develop a better understanding of chitosan and chitosan-based materials for photocatalysis. We have also explored the future aspects of chitosan-based photocatalytic materials to improve the research in the future.

Metal-organic frameworks (MOFs) are an emerging class of materials with unique properties such as extensive surface area, good stability, and high porosity, which facilitate their deployment in various fields of science, including nanomedicine. Numerous strategies have been proposed for designing nanoscale MOF-polymer composites with tailored properties. Polymers can be incorporated inside and outside of the MOF pores to prepare such composites. Polymers are directly grafted to the MOF wall via covalent linkages or physical coordination with the host. Though MOFs are associated with drawbacks like unrestrained liberation, placing of biomolecules/drugs, and less resilience under various physical conditions, a set of advantageous attributes have also been noticed, such as tuning capability and pore size of undecorated MOFs. Novel strategies have been developed to improve MOFs' functioning for bio-imaging, cancer treatment, and drug delivery. For this, the introduction of polymers has proved helpful in expanding the functionalities and diversities of MOFs. Owing to the benefits like a controlled release of drugs in response to extrinsic stimuli, boosted inclination towards targeted cells, intensified MOF durability, and increased biocompatibility, MOF-polymer composites are excellent sources of helpful implementation in the biomedical field. This study provides insight into the synthesis and performance of MOF-polymer composite as a novel candidate in the biomedical sector.