Xing Weilong, Xu Xingyu, Zhang Manwen, Zhang Xiaofei, Shi Yongquan, Nie Peng, Ju Yongming
Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment (MEE), Nanjing 210042, PR China.
The Key Laboratory of Water and Air Pollution Control of Guangdong Province, South China Institute of Environmental Sciences, Ministry of Ecology and Environment (MEE), Guangzhou 510655, PR China.
J Hazard Mater. 2022 Sep 15;438:129413. doi: 10.1016/j.jhazmat.2022.129413. Epub 2022 Jun 18.
To date, zero-valent iron (ZVI)-based technique has encountered a baffle, challenging simultaneous detoxification of refractory rhodamine B (RhB) and p-nitrophenol (PNP) possessing strong electronwithdrawing nitro-group. In this study, we synthesized Ag-Cu decorated sponge iron (s-Fe)-based trimetal for simultaneous degradation of RhB and PNP. The results show that Cu-Ag co-doping s-Fe (s-Fe-(Cu-Ag)) achieves approx. 90.6 % of maximized removal of RhB; the preferred s-Fe-(5 wt%Cu-1 wt%Ag) assisted with 6 L/min aeration rate simultaneously declines RhB and PNP within 10 recycling tests; non-aeration process obtains a complete reduction of PNP as well as merely approx. 23.9 % removal of RhB. Moreover, the Cu-Ag microstructure covering s-Fe-(Cu-Ag) has been characterized in detail. Furthermore, the electron spin resonance (ESR) spectra have been applied to investigate simultaneous generation of reactive oxygen species (ROS) and hydrogen radicals ([H]) over s-Fe-(Cu-Ag). To our best knowledge, this is the first study reporting the enhanced bifunctional catalysis of s-Fe-(Cu-Ag)/O for simultaneous degradation of RhB and PNP.
迄今为止，零价铁（ZVI）基技术遇到了阻碍，难以同时对含有强吸电子硝基的难降解罗丹明B（RhB）和对硝基苯酚（PNP）进行解毒。在本研究中，我们合成了用于同时降解RhB和PNP的Ag-Cu修饰海绵铁（s-Fe）基三金属。结果表明，Cu-Ag共掺杂的s-Fe（s-Fe-(Cu-Ag)）实现了约90.6%的RhB最大去除率；优选的s-Fe-(5 wt%Cu-1 wt%Ag)在6 L/min的曝气速率辅助下，在10次循环测试中同时降低了RhB和PNP；非曝气过程实现了PNP的完全还原以及仅约23.9%的RhB去除率。此外，还详细表征了覆盖s-Fe-(Cu-Ag)的Cu-Ag微观结构。此外，电子自旋共振（ESR）光谱已被用于研究s-Fe-(Cu-Ag)上活性氧物种（ROS）和氢自由基（[H]）的同时生成。据我们所知，这是第一项报道s-Fe-(Cu-Ag)/O增强双功能催化同时降解RhB和PNP的研究。
