**2.5 Adsorption of Hg using carbon black residues**

A sample of liquid mercury (4.89 g) in a 250 mL flask was placed in a water bath with controlled water temperature of 50–100°C at atmospheric conditions. The determination of the mercury vapor adsorption of the carbon residues was done through an experimental set up where the mercury vapor was generated through placing liquid mercury contained in a flask on temperature-controlled water bath. The flask was connected to a reactor glass column filter packed with the carbon residue samples and connected to an active peristaltic air vacuum pump. The experiment was run for 6 hours, **Figure 3**. This was repeated for all the 4 samples of the carbon residues (raw CB; saturated commercial AC; sulfuric acid activated CB; hydrogen peroxide activated CB). The same experiment set up was repeated using an electric hotplate as a heat source (0–300°C) replacing the water bath. This experiment set up was placed and run under an active laboratory fume hood cupboard to ensure safe extraction and emission of all potential fugitive mercury vapor.

### **Figure 3.**

*Experimental set up for the extraction generation and adsorption of mercury vapor on the developed AC from waste Tyre pyrolysis. (a peristaltic vacuum pump connected to the filter unit to extract the mercury vapor under the fume wood cupboard).*
