Sulfate radical (SO₄⁻) based oxidation is an efficient and selective strategy for environmental decontamination. Herein, we confirmed, for the first time, that the fine modulation on semiconducting TiO₂ was able to improve the redox-cycling capability for heterogeneous peroxydisulfate (PDS, S₂O₈²⁻) activation and radicals generation. PDS activation by defective TiO_2−x exposed by high-energy {0 0 1} polar facets was a superior Fenton-like catalytic system for rhodamine B (RhB) and bisphenol A (BPA) degradation, with good activity and selectivity under neutral pH. By radical inhibiting tests with two different scavengers, fluorescence measurements with terephthalic acid and electron paramagnetic resonance (EPR) technique, only the SO₄⁻ was identified to be the main reactive species from PDS activation on defective TiO_2−x for pollutants degradation. Compared to the reported TiO_2−x/H₂O₂ system, the proposed TiO_2−x/PDS system exhibited much lower water matrix effects in the presence of four typical anions, natural organic matters and real surface water for target pollutants degradation. The selective SO₄⁻-mediated TiO_2−x/PDS catalytic system in natural water matrix and the no toxicity of catalytic material were of considerable interest for practical environmental applications with highly complex chemistry. Our findings elucidated a new strategy for efficient and selective PDS activation based on the defect-related chemistry, which can degrade environmental contaminants and remedy contaminated soil based on sulfate components with much reduced matrix effects.

硫酸根（SO ₄ ^- ）基于氧化是环境净化的有效的和选择性的策略。在这里，我们首次确认了对半导体TiO ₂的精细调节能够提高非均相过氧二硫酸盐（PDS，S ₂ O ₈ ^2-）活化和自由基产生的氧化还原循环能力。缺陷TiO _{2- x}激活PDS高能{0 0 1}极性小面暴露的是一种出色的Fenton样催化体系，用于罗丹明B（RhB）和双酚A（BPA）降解，在中性pH下具有良好的活性和选择性。通过用两种不同的清除剂，与对苯二甲酸和电子顺磁共振（EPR）技术，只有SO荧光测量自由基抑制试验₄ ^-被鉴定为从PDS激活主反应性物质上的TiO缺陷_{2- X}污染物的降解。与已报道的TiO _{2− x} / H ₂ O ₂体系相比，拟议的TiO _{2− x}/ PDS系统在四种典型阴离子，天然有机物和实际地表水对目标污染物的降解作用下表现出低得多的水基质效应。选择性SO ₄ ^-介导的TiO _{2- X}在天然水中的基质/ PDS催化体系和催化材料的无毒性均用于与高度复杂的化学实际环境应用相当大的兴趣。我们的发现阐明了一种基于缺陷相关化学物质的高效选择性PDS活化的新策略，该策略可以降解环境污染物并基于硫酸盐成分以减少基质效应的方式修复受污染的土壤。