一种从废弃晶硅光伏组件中回收银和铝的新型离子交换方法

Abstract As the in-service photovoltaic (PV) modules approach the end of their lifespan, high-efficient and low polluted recycling technologies becomes the key to promote the healthy development of PV industry. The strong acid and alkalis are utilized to leach silver and aluminum from the cells in the waste crystalline silicon (c-Si) PV modules, which can be particularly detrimental to the environment, especially regarding water quality. A novel ion exchange method is proposed to leach the silver and aluminum from the waste c-Si modules. The adsorption of iodide ions onto Dowex 1 × 8 ion exchange resin primarily involves the reaction between –NH 2 groups and I - . The adsorption of silver and aluminum from leachate using T42H resin primarily occurs through the interaction between R-SO 3 H functional groups and [AgI] - ions, as well as Al 3+ ions. The ion exchange resin efficiently eliminates impurities such as I - , resulting in a benign solution for industrial wastewater treatment. The SEM-EDS is employed for morphological characterization of both resins before and after adsorption, while Fourier transform infrared (FTIR) spectroscopy is utilized to analyze changes in their functional groups, and XPS is used for precise characterization of the adsorbed silver and aluminum. The ICP-OES is used to calculated the adsorption efficiencies of 99.97 % for silver and 99.84 % for aluminum. The 2.7853 mg silver and 17.2093 mg aluminum are recovered from the leach solution in 1 g of c-Si PV cell. Ion exchange recycling of c-Si PV modules has lower environmental impact.