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The petroleum refining industry produces a large amount of spent hydrodesulphurization (HDS) catalyst every year, representing a hazardous solid waste but also an important secondary resource. In the work presented herein, extraction of molybdenum from spent HDS catalyst by two-stage roasting followed by water leaching was investigated. The effects of sodium carbonate roasting and water leaching on...
A novel process was proposed for the separation of Cu and As from Cu-smelting waste acid (CSWA). This process includes three steps, namely, the oxidization of As via the addition of H2O2, the selective separation of Cu through the use of Na2S, and the removal of As via the synthesis of scorodite. The CSWA was initially oxidized using H2O2 where the As(III) transformed into As(V). The oxidization of...
Organic semiconducting materials have demonstrated attractive light-absorption and photocurrent-generation functions due to their delocalized π electrons as well as intra-molecular and inter-molecular charge separation processes. On the other hand, organic semiconducting materials have easy property tuning, are mechanically flexible, and have large-area thin film formation properties. As a result,...
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