Yang Li,Hairun Ma,Wenyu Xie,Jiahao Liang,Min Li,Shaohui Guo,Guangxu Yan
The short service life and low catalytic activity of electrodes are the major bottlenecks limiting the practical applications of current electrocatalytic oxidation technology in wastewater treatment. In this study, a novel Ti/SnO 2 -Sb-Nd-Pt electrode loading TiO 2 nanotube (TiO 2 -NTs) array was proposed and prepared. The optimized TiO 2 nanotube (TiO 2 -NTs) arrays provided abundant anchoring sites for SnO 2 -Sb-Nd-Pt active coating and improved the bonding strength between the Ti matrix and the SnO 2 -Sb-Nd-Pt active coating as a mediator, as a result, higher electrocatalytic performance and stability. The nitrobenzene (NB) removal and service life were significantly higher in Ti/TiO 2 -NTs/SnO 2 -Sb-Nd-Pt (91.08 % and 4381.9 days) when compared to Ti/SnO 2 -Sb-Nd-Pt (80.61 % and 1151.2 days). In addition, the outstanding electrocatalytic performance of Ti/TiO 2 -NTs/SnO 2 -Sb-Nd-Pt with an oxygen evolution potential of 2.03 V and total voltametric charge of 5.88 mC cm −2 makes it a promising candidate for future industrial applications. These findings will lay a solid foundation for broadening the applications of well-defined TiO 2 -NTs arrays prepared via the two-step anodization.
Qian Zhang,Xinwen Li,Kang Chen,Ying Hu,Rongmei Liu,Guixiang Qian,Zhongliang Tian,Chao Yang
This study presents a FePO 4 -Zn/Pt hybrid power battery system designed for lithium extraction from salt lake brines. Initially, the FePO 4 -Zn battery is utilized for lithium intercalation to form LiFePO 4 , which is subsequently reassembled into a LiFePO 4 -Pt battery for lithium deintercalation. As a result, a Li + -rich aqueous solution, free from interfering metal cations, is obtained. The system eliminates the need for ion-exchange membranes, as the Pt electrode remains separated from the brine, thereby preventing contamination by impurity cations. When applied to a brine containing 0.25 g/L Li + and 73 g/L Mg 2+ , followed by desorption in a solution of 0.25 g/L Li + , only a minimal amount of Mg 2+ was transferred to the lithium chloride solution after two cycles, achieving effective lithium extraction and enrichment with an efficiency of 80.6%.
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