Inspired by natural enzymes with various activities, controlling the catalytic activity of nanozymes through suitable strategies has received extensive attention. By modifying non-magnetic steel slag material (NMSS) with porphyrin, we developed a new kind of bifunctional nanozymes (NMSS-Por) with both simulated enzyme activity and photocatalytic activity. The NMSS-Por nanozymes exhibit outstanding colorimetric sensing and photodegradation performances, with a limit of detection (LOD) of 0.257 µM, 0.102 µM and 0.142 µM for tetracycline (TC), oxytetracycline, and doxycycline, while a removal rate of 79 % for TC after 60 min. Hydroxyl radical (·OH), positively charged hole (h), singlet oxygen (O), and photogenerated electron transfer process play vital roles in both catalytic reactions. Besides, NMSS-Por nanozymes has excellent selectivity for TC detection and can also be used as promising photocatalysts for real water treatment. This work provides a new and promising strategy for the high value-added resource utilization of waste steel slag in environmental catalysis, which is in accordance with the sustainable development of green chemistry.

中文翻译：

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卟啉功能化非磁性钢渣作为双功能纳米酶用于四环素的比色检测和光催化降解

受具有各种活性的天然酶的启发，通过合适的策略控制纳米酶的催化活性受到了广泛的关注。通过用卟啉对非磁性钢渣材料（NMSS）进行改性，我们开发了一种兼具模拟酶活性和光催化活性的新型双功能纳米酶（NMSS-Por）。 NMSS-Por 纳米酶表现出出色的比色传感和光降解性能，对四环素 (TC)、土霉素和强力霉素的检测限 (LOD) 分别为 0.257 µM、0.102 µM 和 0.142 µM，而 TC 去除率为 79% 60分钟后羟基自由基（·OH）、带正电的空穴（h）、单线态氧（O）和光生电子转移过程在这两个催化反应中都起着至关重要的作用。此外，NMSS-Por纳米酶对TC检测具有优异的选择性，也可用作实际水处理的有前景的光催化剂。该工作为废钢渣在环境催化中的高附加值资源化利用提供了一种新的、有前景的策略，符合绿色化学的可持续发展。