The Zn/Fe-modified biochar on nitrobenzene (NB) removal during the electrolysis was investigated in this study. Both the Fe and Zn-modified biochar enhanced the NB adsorption compared with the un-modified biochar due to their greater specific surface area and more abundant surface function groups, respectively. The electrolysis under 2–11 V with the assist of both Fe/Zn-modified biochar achieved effective NB removal (>93%). The removal rate under 2 V using Zn/Fe-modified biochar (∼94%) was higher than that of the un-modified biochar (∼80%), whereas the removal was similar for those under 5, 8 and 11 V. The NB removal under 2 and 5 V was attributed to both adsorption and electrochemical decomposition of NB molecules. Electrolysis under 5 V by Fe-modified biochar had a higher degree of NB mineralisation than that using un-modified and Zn-modified biochar. This was likely that the Fe-modified biochar exhibited higher electrocatalytic properties, facilitating the further NB mineralisation. The ∙OH played significant roles in the degradation of NB by Fe-modified and un-modified biochar but did not significantly participated for the test using Zn-modified biochar. This was possibly because the Zn-modified biochar could adsorb greater amounts of ∙OH into the inner pores of Zn-modified biochar via its greater porosity and specific surface area, which may prevent the contact between ∙OH and NB molecules.

本研究研究了电解过程中锌/铁改性生物炭对硝基苯（NB）去除的影响。与未改性的生物炭相比，铁和锌改性的生物炭分别增强了NB的吸附，这是因为它们的比表面积更大，表面官能团更丰富。在2-11 V下通过Fe / Zn修饰的生物炭进行电解可有效去除NB（> 93％）。使用Zn / Fe改性的生物炭在2 V下的去除率（〜94％）高于未改性的生物炭（〜80％）的去除率，而在5、8和11 V下的去除率则相似。在2和5 V下去除NB归因于NB分子的吸附和电化学分解。与未改性和锌改性生物炭相比，铁改性生物炭在5 V下的电解具有更高的NB矿化度。铁改性的生物炭可能表现出更高的电催化性能，从而促进了进一步的NB矿化。∙OH在铁修饰的和未修饰的生物炭对NB的降解中起着重要作用，但没有显着参与使用锌修饰的生物炭进行的测试。这可能是因为Zn修饰的生物炭可以将更多的∙OH吸附到Zn修饰的生物炭的内孔中 ∙OH在铁修饰的和未修饰的生物炭对NB的降解中起着重要作用，但没有显着参与使用锌修饰的生物炭进行的测试。这可能是因为Zn修饰的生物炭可以将更多的∙OH吸附到Zn修饰的生物炭的内孔中 ∙OH在铁修饰的和未修饰的生物炭对NB的降解中起着重要作用，但没有显着参与使用锌修饰的生物炭进行的测试。这可能是因为Zn修饰的生物炭可以将更多的∙OH吸附到Zn修饰的生物炭的内孔中由于其较大的孔隙率和比表面积，可能会阻止∙OH和NB分子之间的接触。