Photocatalytic uranium removal from basic effluent by porphyrin-Ni COF as the photocatalyst
Photocatalytic uranium removal from basic effluent by porphyrin-Ni COF as the photocatalyst
复制标题
卟啉-Ni COF光催化剂光催化碱性废水脱铀
DOI：
10.1016/j.cej.2022.140378
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发表时间：
2022-11-17
影响因子：
15.1
通讯作者：
Xia, Chuanqin
中科院分区：
文献类型：
--
作者：
Chen, Lang;Hang, Jiahui;Xia, Chuanqin
光催化法去除放射性废水中的铀被认为是一种防止环境污染的绿色方法。然而，几乎所有的光催化剂都是在厌氧条件下或与额外的牺牲剂一起使用的。本文以5，10，15，20-（四-4-氨基苯基）卟啉镍（TPP-Ni）和噻吩并[3，2-B]噻吩-2，5-二甲醛（TT）为原料，通过Aldamine反应合成了光催化剂TT-Por COF-Ni，研究了其在空气气氛下对碱性溶液中铀的非牺牲光催化去除效果。过氧化氢（H2 O2）是通过光催化还原O2产生的，然后通过与铀酰原位反应形成偏菱镁矿。实验结果表明，在空气气氛下，不需添加牺牲剂，可将铀光驱动脱除至碱性溶液中1 ppm残留，在太阳光照射下，铀的脱除率可达97.1%。值得注意的是，我们的策略可以从模拟的含铀核燃料循环流出物中回收铀，在碱性条件下的去除率为95.5%，这表明了实际应用的潜力。
Photocatalytic uranium removal from radioactive wastewater is considered as a green method to prevent environment contamination. However, almost all photocatalysts are used in anaerobic condition or with extra sacrificial agent. Herein, we report a strategy for non-sacrificial photocatalytic uranium removal from basic solution under air by photocatalyst TT-Por COF-Ni, which was synthesized via Aldamine reaction between 5,10,15,20-(tetra-4-aminophenyl)porphyrin-Ni (TPP-Ni) and thieno[3,2-b]thiophene-2,5-dicarbaldehyde (TT). Hydrogen peroxide (H2O2) is generated by photocatalytic reduction of O2, and followed by formation of met-astudtite via in situ reaction with uranyl. As a result, uranium can be photo-driven removed to 1 ppm residual in basic solution under air atmosphere without adding extra sacrificial agent, and uranium removal reached to 97.1 % upon solar illumination. Remarkably, our strategy can recover uranium with 95.5 % removal rate from simulated uranium-containing effluent from nuclear fuel cycle in basic condition, which suggests a potential for practical application.