*2.1. Thermal Treatment of CRT Glass Samples*

In a preliminary step the CRT glass samples with the composition presented in Table 1 were ground to a fine powder (3.5–5.5 μm) in order to promote the reaction between the CRT glasses samples and Na2CO3. All tests were carried out in an electrical furnace at 1000 ◦C with duration of 30 min, combining 10 g of CRT glass with 24 g of Na2CO3. After the thermal treatment the cooled samples were washed with 100 mL of distillated water in order to selectively remove the soluble silicates and hydroxides.



#### *2.2. Lead Dissolution Process*

The solid material obtained from the washing step was dissolved, over a period of one hour, in 150 mL of acetic acid (CH3COOH) solution using a chemical reactor equipped with a stirrer operated isothermally at 80 ◦C. In order to determine the optimal concentration of acetic acid for the dissolution process, the experiments were performed at different concentrations of CH3COOH in the range of 0.2–1 M. Glacial acetic acid of analytical purity and bidistilled water were used to obtain the leaching solutions. Finally, the solution was filtered in order to separate it from the precipitated solid residues which contained mainly SiO2. The lead concentration in the samples taken during the dissolution was determined using an atomic absorption spectrophotometer.
