Environment-friendly and low-cost catalysts are important for persulfate based advanced oxidation processes. In this study, we reported a CO₂-activated biochar (AC) as a low-cost and efficient catalyst for persulfate (PS) activation and the degradation of phenol and chlorophenols. The AC950 showed the best catalytic performance for PS with an oxidant utility of 0.5 mol/mol oxidant/h/g with an activation energy of 15.86 kJ/mol owing to its large surface area, rich surface defects, and well-modified oxygen functional groups. In contrast to a radical-based mechanism, this novel biochar/persulfate system works through a non-radical mechanism that includes singlet state oxygen generation and an electron transfer reaction pathway. The major degradation intermediate of the phenolic pollutant was identified to be benzoquinone; moreover, amongst chlorophenols, the para-chlorine substituent was the first to degrade. The durability of the catalyst was low, it was deactivated primarily because of the oxidation of the carbon surface, and thermal regeneration was determined to be efficient for its recovery. Furthermore, HCO₃⁻ and HPO₄²⁻ were found to considerably inhibit the performance of the catalytic oxidation system.

环保且低成本的催化剂对于基于过硫酸盐的高级氧化工艺至关重要。在这项研究中，我们报告了CO ₂活化的生物炭（AC），是低成本，高效的过硫酸盐（PS）活化以及苯酚和氯酚降解的催化剂。AC950由于具有较大的表面积，丰富的表面缺陷和经过良好修饰的氧官能团，因此具有0.5 mol / mol氧化剂/ h / g的氧化效用，具有15.86 kJ / mol的活化能，对PS具有最佳的催化性能。 。与基于自由基的机理相反，这种新颖的生物碳/过硫酸盐体系通过非自由基机理起作用，该机理包括单态氧的产生和电子转移反应途径。酚类污染物的主要降解中间体是苯醌。此外，在氯酚中，对氯取代基是第一个被降解的。催化剂的耐久性低，主要由于碳表面的氧化而使其失活，并且热再生被确定对于其回收是有效的。此外，HCO₃ ^-和HPO ₄ ^2-，发现显着地抑制催化氧化系统的性能。