Among the various techniques available to recycle waste tyres, pyrolysis has nowadays gained interest from industries because this process transforms waste tyres into useful organic compounds in the absence of oxygen at high temperatures. This process is eco-friendly and recovery of 30 to 40% by weight of pyrolytic char is achieved. The recovered pyrolytic char can be used to produce AC in the presence of steam or CO\({}_{2}\) at high temperatures [15]. Figure 1 presents the steps involved in the production of AC from waste tyres, which can be listed as follows:  
1. Collecting waste tyres from retailers, waste tyre depots, etc. 2. Shredding and pulverizing the waste tyres to form granules. This step also involves the removal of steel and reinforcing fabric. 3. In the next step, an acid solution is used to pre-treat the granulated waste tyres. * Pyrolysis is then carried out to convert the waste tyre into carbon black and other by-products such as oil. * The carbon black is activated using physical or chemical processes to obtain the AC. * The AC can then be utilized for various applications such as wastewater treatment, water purification, use in energy storage devices, and so on. AC possesses the micro-crystal porous form of carbon, which acts as an excellent adsorbent material for the isolation and recovery of trace materials in the food, beverage, cosmetic, pharmaceutical, and chemical industries. In addition, AC finds application in water treatment and purification, where physical or chemical adsorption mechanisms play a major role in removing impurities. The application of AC in water purification is made possible due to its adsorption capacity, low cost, durability, and safety. The quality of AC depends on its structure, as most of these structures are tridisperse, meaning that they have micropores (radii--18-20 A), macro pores (radii--18-20 A), and mesopores (radii--500-20,000 A). The quantity of each pore size is crucial in determining the type of impurity that is adsorbed. As different sizes will adsorb different-sized molecules in their structure, only a few micropores will align directly toward the outer surface of the carbon particles. Generally, most of the pore structures are organized in the following pattern: macropores open directly to the external surface of the carbon particle; mesopores and micropores branch off from macropores and mesopores, respectively. The specific area of the micropores usually amounts to at least 90% of the total surface area. Microporous materials are important in the water treatment process because of their ability to adsorb a wide variety of contaminants in the aqueous phase. This gives rise to its application as a substitute for conventional advanced water treatment technologies that require high maintenance and operational costs [16; 17]. The selection of a suitable type of AC for a specific application depends upon the physical and chemical properties of the specific species to be adsorbed. The production process also contributes to the high porosity and surface area of the activated carbon. A summary of recent reviews reported in the literature on the applications of AC derived from waste tyres is presented in Table 1. It was observed that the AC made from waste tyres finds applications in various fields such as wastewater treatment, removal of dye and other pollutants by adsorption, energy storage, gas phase adsorption, etc. The challenges and difficulties in producing and activating carbon were also discussed by the authors. Figure 1: Steps involved in the production of activated carbon from waste tyres. Since AC has excellent adsorbent properties, this study reviews the processes involved in the production of AC from waste types, the types of activation, the forms of AC, and the factors affecting the performance of AC. Various applications of AC derived from waste types are reviewed in this study, with a focus on its potential use in removing contaminants from wastewater.