What is the role of sulfuric acid and ferric sulfate in the leaching process of silver and copper from photovoltaic waste?

Label:chem

Topic
The study investigates an alternative leaching system using sulfuric acid and ferric sulfate instead of nitric acid to recover valuable metals like silver and copper from end-of-life photovoltaic panels. This approach aims to address environmental concerns related to the use of nitric acid, which can produce hazardous gases such as NOx.
Answer
Sulfuric acid and ferric sulfate serve as the leaching agents to dissolve silver and copper from photovoltaic waste. The study shows that high recovery rates of silver (>85%) and copper (>96%) can be achieved at room temperature using relatively low concentrations of 0.2M sulfuric acid and 0.15M ferric sulfate. This system is environmentally friendly and avoids the production of toxic NOx gases.
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