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

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Selective Capacitive Recovery of Rare-Earth Ions from Wastewater over Phosphorus-Modified TiO2 Cathodes via an Electro-Adsorption Process
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-23 , DOI: 10.1021/acs.est.4c03241
Minlin Mao _{1,

2} , Yue Qi ₁ , Kaibin Lu ₁ , Qin Chen ₁ , Xiangta Xie ₁ , Xiaoqin Li _{1,

2} , Zhang Lin _{3,

4} , Liyuan Chai ₃ , Weizhen Liu _{1,

2}

Affiliation

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. This study provides a promising method for the efficient recovery of REIs from wastewater.

中文翻译：

通过电吸附过程在磷改性 TiO2 阴极上选择性电容回收废水中的稀土离子

大量含有低浓度(<10 id=16>2 /P/C)复合电极的废水，对Eu ³⁺ 、Dy ³⁺ 、Tb ³⁺ 、Lu等REI表现出99%以上的回收效率混合溶液中³⁺ 。该系统即使在100次循环后仍保持高效率和超过90倍的REIs富集浓度。体系中正向电压作用下，TiO ₂中的Ti ⁴⁺被还原为Ti ₃ O ₅中的Ti ³⁺ ，捕获磷位点的电子，使其被氧化为与REI有较强亲和力的磷酸盐，从而提高了选择性房地产投资机构。在反向电压作用下，Ti ₃ O ₅被氧化为TiO ₂ ，TiO 2 将电子转移至磷酸盐并转化至磷位点，导致REI的解吸和富集以及电极的再生。这项研究为从废水中有效回收 REI 提供了一种有前途的方法。

更新日期：2024-07-23

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