Porous Ni‐based catalysts have attracted extensive attention for a wide range of applications in energy production and environmental remediation due to controllable morphology, high dispersion. These properties are mainly governed by a number of parameters such as compositions, synthesis methods, their structural morphology, and surface area. Various efforts have made to develop unsupported template‐assisted catalysts with specific nanostructures and surface properties, a new approach in supramolecular chemistry. This review reports a detailed overview of the development of mesoporous nickel‐based catalysts for energy and environmental applications. This review also looks at recent advancements, synthesis routes for porous nickel‐based catalysts, and comparative study with the reported Ni‐based catalysts. This review addresses numerous characteristic reactions and processes in the utilization of organic wastes, highlighting the significance of developing porous, proficient, and stable Ni‐based catalysts.

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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.