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Several industries release varying concentration of dye-laden effluent with substantial negative consequences for any receiving environmental compartment. The control of water pollution and tighter restriction on wastewater discharge directly into the environment to reduce the potential ecotoxicological effect of dyes is forcing processors to retreat and reuse process water and chemicals. Among the different available technologies, the adsorption process has been recognized to be one of the finest and cost-effective wastewater treatment technologies. Various adsorbents have been utilized to remove toxic dyes from water and wastewater. Here, we review the application of polyaniline-based polymeric adsorbent for the adsorption of dyes which have been received considerable attention. To date, various modifications of polyaniline have been explored to improve the adsorption properties. Review on the application of polyaniline for adsorption of dyes has not been present till date. This article provides relevant literature on the application of various polyaniline composites for removing dyes, and their adsorption capacities with their experimental conditions have been compiled. It is evident from the literature survey that polyaniline provides a better opportunity for scientists for the effective removal of various dye. [ABSTRACT FROM AUTHOR]

• Iron based nancomposites decorated adsorbents have been pronounced as magsorbents. • Magsorbents employed for the removal of methylene blue dye has been reviewed. • Magsorbents have been proven as easy and efficient tools in wastewater treatment. • The effect of operating parameters and mechanism of interactions were elucidated. • Magsorbents offer their easy separation during treatment process. In recent years, several industries release varying concentrations of dye-containing wastewater directly into the ecosystem and become the foremost environmental concern. The adsorption method has been recognized to be one of the most effective techniques for the remediation of wastewater. The great efforts have been made by scientists to produce highly selective, discerning, and effective adsorbents. The introduction of magnetic iron oxide nanoparticles to adsorbents has led to a new avenue in resolving water pollution problems and found to have predominant significance in the elimination of dyes more efficiently compared to traditional adsorbents. Due to their unique physicochemical properties, magnetized adsorbents (magsorbents) display high removal efficiency along with easy and fast separation of adsorbent from aqueous media simply by applying an external magnetic field. Such a facile route of separation is crucial to increase the overall efficiency of operation and has great importance for practical application. This review summarizes the notable works carried out on the application of magsorbents for the adsorptive removal of cationic methylene blue (MB) dye from wastewater. The detailed information on the BET surface area, point of zero charge, operational conditions, and results on isotherm, kinetic and thermodynamics as reported on different magsorbents have been compiled. The present paper was planned with the prime objective to make the scientists up-to-date and to provide the valuable information of the developments that have been made as yet for the elimination of MB dye from aqueous solution by employing a variety of magsorbents. [ABSTRACT FROM AUTHOR]