Selective Capacitive Recovery of Rare-Earth Ions from Wastewater over Phosphorus-Modified TiO2 Cathodes via an Electro-Adsorption Process

Large amounts of wastewater containing low-concentration (

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Veröffentlicht in:	Environmental science & technology 2024-08, Vol.58 (31), p.14013-14021
Hauptverfasser:	Mao, Minlin, Qi, Yue, Lu, Kaibin, Chen, Qin, Xie, Xiangta, Li, Xiaoqin, Lin, Zhang, Chai, Liyuan, Liu, Weizhen
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Sprache:	eng
Schlagworte:	Cathodes Earth Economic impact Electric potential Electrodes Electrons Environmental protection Ions Phosphorus Physico-Chemical Treatment and Resource Recovery Processing industry Rare earth elements Resource recovery Titanium dioxide Titanium oxides Voltage Wastewater
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creator	Mao, Minlin Qi, Yue Lu, Kaibin Chen, Qin Xie, Xiangta Li, Xiaoqin Lin, Zhang Chai, Liyuan Liu, Weizhen
description	Large amounts of wastewater containing low-concentration (
doi_str_mv	10.1021/acs.est.4c03241
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Hence, achieving efficient selective recovery of low-concentration REIs from REIs-containing wastewater is essential for environmental protection and resource recovery. In this study, a pseudocapacitance system was designed for highly efficient capacitive selective recovery of REIs from wastewater using the titanium dioxide/P/C (TiO2/P/C) composite electrode, which exhibited over 99% recovery efficiency for REIs, such as Eu3+, Dy3+, Tb3+, and Lu3+ in mixed solution. This system maintained high efficiency and more than 90 times the enrichment concentration of REIs even after 100 cycles. Ti4+ of TiO2 was reduced to Ti3+ of Ti3O5 under forward voltage in the system, which trapped the electrons of phosphorus site and caused it to be oxidized to phosphate with a strong affinity for REIs, thus improving the selectivity of REIs. Under reverse voltage, Ti3O5 was oxidized to TiO2, which transferred electrons to phosphate and transformed to the phosphorus site, resulting in the desorption and enrichment of REIs and the regeneration of the electrode. 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Sci. Technol</addtitle><description>Large amounts of wastewater containing low-concentration (<10 ppm) rare-earth ions (REIs) are discharged annually in China’s rare-earth mining and processing industry, resulting in severe environmental pollution and economic losses. Hence, achieving efficient selective recovery of low-concentration REIs from REIs-containing wastewater is essential for environmental protection and resource recovery. In this study, a pseudocapacitance system was designed for highly efficient capacitive selective recovery of REIs from wastewater using the titanium dioxide/P/C (TiO2/P/C) composite electrode, which exhibited over 99% recovery efficiency for REIs, such as Eu3+, Dy3+, Tb3+, and Lu3+ in mixed solution. This system maintained high efficiency and more than 90 times the enrichment concentration of REIs even after 100 cycles. Ti4+ of TiO2 was reduced to Ti3+ of Ti3O5 under forward voltage in the system, which trapped the electrons of phosphorus site and caused it to be oxidized to phosphate with a strong affinity for REIs, thus improving the selectivity of REIs. Under reverse voltage, Ti3O5 was oxidized to TiO2, which transferred electrons to phosphate and transformed to the phosphorus site, resulting in the desorption and enrichment of REIs and the regeneration of the electrode. 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This system maintained high efficiency and more than 90 times the enrichment concentration of REIs even after 100 cycles. Ti4+ of TiO2 was reduced to Ti3+ of Ti3O5 under forward voltage in the system, which trapped the electrons of phosphorus site and caused it to be oxidized to phosphate with a strong affinity for REIs, thus improving the selectivity of REIs. Under reverse voltage, Ti3O5 was oxidized to TiO2, which transferred electrons to phosphate and transformed to the phosphorus site, resulting in the desorption and enrichment of REIs and the regeneration of the electrode. 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subjects	Cathodes Earth Economic impact Electric potential Electrodes Electrons Environmental protection Ions Phosphorus Physico-Chemical Treatment and Resource Recovery Processing industry Rare earth elements Resource recovery Titanium dioxide Titanium oxides Voltage Wastewater
title	Selective Capacitive Recovery of Rare-Earth Ions from Wastewater over Phosphorus-Modified TiO2 Cathodes via an Electro-Adsorption Process
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