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High‐Throughput Pb Recycling for Perovskite Solar Cells Using Biomimetic Whitlockite

2022; Wiley; Volume: 6; Issue: 3 Linguagem: Inglês

10.1002/eem2.12374

2575-0356

Jung Sug Hong, Hee Jung Kim, Chang Hwun Sohn, Oh Yeong Gong, Jin Hyuk Choi, Kang Hee Cho, Gill Sang Han, Ki Tae Nam, Hyun Suk Jung,

Perovskite Materials and Applications

Pb contamination in aquatic environments causes severe pollution; therefore, harmless absorbents are required. In this study, we report a novel synthesis of whitlockite (WH, Ca 18 Mg 2 (HPO 4 ) 2 (PO 4 ) 12 ), which is the second most abundant biomineral in human bone, and its application as a high‐performing Pb 2+ absorbent. Hydroxyapatite (HAP) and WH are prepared via a simple precipitation method. The Pb 2+ absorption performance and mechanism of the synthesized biominerals are investigated in aqueous solutions at neutral pH. The results demonstrate that WH exhibits an excellent Pb 2+ absorption capacity of 2339 mg g −1 , which is 1.68 times higher than the recorded value for HAP. Furthermore, the absorbed Pb 2+ ions are recycled into high‐purity PbI 2 . This is employed as a precursor for the fabrication of perovskite solar cells (PSCs), resulting in a conversion efficiency of 19.00% comparable to that of commercial PbI 2 powder (99.99% purity). Our approach provides an efficient way to remove Pb 2+ ions from water and reuse them in the recycling of PSCs.