2.5.4. TGA-DSC

Thermal decomposition of the ammonium jarosite, obtained in the final stage, was carried out in a TA Instruments SDT Q650 simultaneous thermal analyzer with thermogravimetric (TG) and di fferential scanning calorimetry (DSC) capabilities (TA Instruments, New Castle, DE, USA). Analyses were performed using 10 mg sample with a heating rate of 10 ◦C/min to 400 ◦C under argon atmosphere. The furnace temperature was regulated precisely to provide a uniform rate of decomposition.

#### **3. Results and Discussions**
