A review paper on heterogeneous fenton catalyst: Types of preparation, modification techniques, factors affecting the synthesis, characterization, and application in the wastewater treatment

Abstract

This comprehensive review focuses on the different factors, modification in the synthesis method, char-acterization and application of heterogeneous catalyst in the wastewater treatment based on the Fen-ton process. The present review highlights the different catalyst preparation methods like wet impreg-nation method, hydrothermal method, sol-gel method, precipitation method and their application to treat different recalcitrant organic chemicals. Major heterogeneous catalyst synthesis methods were discussed with their excellent workability. The importance of modification through physical and chemi-cal method was also reported. Different catalyst, pollutants and optimum parametric conditions avail-able in the literature along with some relevant studies are summarized. The effect of factors like pH, calcination and some other modifiers on the synthesis and their efficiency in the wastewater treatment has been described. The important characterization of synthesized catalysts explaining their working efficiency has also been discussed. In the final section, the application of heterogeneous catalyst syn-thesized by different methods in the wastewater/effluent treatment has been investigated. The main aim of this review is to find out the influence of process parameters and catalytic method on degrada-tion/decolorization of organic compounds present in industrial or synthetic wastewater.