Sulfate radicals (SO₄^·−) are highly efficient for the degradation organic pollutants. SO₄^·− can be produced by activation of sulfites, yet actual heterogeneous activators exhibit a lower reactivity for activation of sulfite to SO₄^·− at pH 7.0–8.0. Here we hypothesized that zero-valent copper can activate sulfite under mild conditions. We tested the reaction with iohexol, diatrizoate, atrazine, benzoic acid, and p-chlorobenzoic acid contaminants. Reactive radicals were identified by electron paramagnetic resonance, fluorescence spectrometry, and radical scavenging experiments. Results show up to 90% abatement of contaminants by combining sulfite with zero-valent copper at pH 8.0. Moreover, zero-valent copper maintains a crystalline stability and satisfactory reusability with iohexol abatement efficiency up to 80% after five runs.

中文翻译：

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零价铜和亚硫酸盐增强的有机污染物消除能力

硫酸根（SO ₄ ^·−）对降解有机污染物非常有效。可以通过亚硫酸盐的活化来产生SO ₄ ^·−，但是实际的非均相活化剂在pH 7.0–8.0时对亚硫酸盐活化为SO ₄ ^·−的反应性较低。在这里我们假设零价铜可以在温和的条件下活化亚硫酸盐。我们用碘海醇，泛影酸盐，阿特拉津，苯甲酸和p-氯苯甲酸污染物。反应性自由基通过电子顺磁共振，荧光光谱和自由基清除实验进行鉴定。结果表明，通过在pH 8.0下将亚硫酸盐与零价铜结合，可以最大程度地减少90％的污染物。此外，零价铜在五次运行后仍保持晶体稳定性和令人满意的可重复使用性，碘海醇的减排效率高达80％。