Chitosan sorbents used for dye removal

The rapid increase in the amount of dye-containing wastewater produced in various industries is a major environmental concern and a challenge to existing conventional wastewater treatment systems. Among them, adsorption is considered to be one of the most efficient methods due to its high dye removal efficiency, easy operation, cost effectiveness, and recyclability of adsorbents. With this in mind, this article presents the characteristics of various types of dyes and sorbents used to remove them. Chitosan, methods of its modification and sorption efficiency of anionic and cationic dyes depending on the method of chitin/chitosan sorbent preparation are described in detail. The paper explains the mechanism of dye adsorption. In the second part of the article, mathematical models of adsorption - kinetic equations, mono- and multi-layers and isotherms flow models were collected and characterized.

Automated summary

This article discusses the importance of adsorption methods in treating dye-containing wastewater, introduces the characteristics of different types of dyes and sorbents, and describes in detail the modification methods of chitosan and sorption efficiency. It also explains the mechanism of dye adsorption and mathematical models of adsorption.