Electrochemical recovery of platinum using deep eutectic solvents

• Main Authors: Cheng-Ping Li, 李承凭
• Other Authors: Feng-Yin Li
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/32131229425505712759

碩士 === 國立中興大學 === 化學系所 === 104 === Platinum group metals are both expensive and important so the recycling of such noble metals becomes a vital procedure. Unfortunately their recycling processes are usually complicated and highly toxic, especially in their first step which requires the platinum dissolution. In the current practical applications, platinum dissolution has been recognized as the most difficult step in the platinum recycle mostly due to the invulnerability of platinum in conventional solvents. In order to dissolve metallic platinum in the manner of green chemistry, deep eutectic solvents (DESs) are adopted to replace the reagents with either high corrosive, such as aqua regia (HNO3/HCl), or strong oxidative, for example piranha acid (H2SO4/H2O2). The inductively coupled plasma optical emission spectrometry (ICP-OES) was used to examine the electrolyte as the evidence for platinum dissolution. The ultraviolet–visible (UV-vis) spectroscopy and the field emission scanning electron microscope (FE-SEM) with an energy dispersive spectrometer (EDS) were used to examine the surface topography and the elemental compositions of the electrodeposits. The composition of electrodeposits were also characterized with X-ray diffraction (XRD) measurement. Further investigations will be focused on the optimization of the ChCl–ZnCl2 systems to improve the dissolution rate and to reduce the cost.