化学
光催化
超纯水
光降解
萘普生
激进的
光化学
降级(电信)
萘
质谱法
高级氧化法
核化学
色谱法
有机化学
化学工程
催化作用
计算机科学
工程类
医学
电信
替代医学
病理
作者
Marta Jiménez-Salcedo,Miguel Monge,Marı́a Teresa Tena
标识
DOI:10.1016/j.jece.2021.106964
摘要
Differences in the photocatalytic degradation rates of naproxen (a nonsteroidal anti-inflammatory drug) in ultrapure water and tap water were assessed using g-C3N4 nanosheets as photocatalyst and irradiating with natural sunlight and low-power (4 × 10 W) white light LEDs. The graphitic carbon nitride (g-C3N4) photocatalyst was synthesised and characterised. All the photodegradations followed pseudo-first-order kinetics. Liquid chromatography with tandem mass spectrometry (UPLC-QToF-MS) was used to identify the intermediates generated in the degradation of naproxen by accurate mass and MS/MS data. Among the by-products detected, 2-(naphthalene-2-yl)propanal, a compound with structural warning for genotoxic carcinogenicity, has been reported for the first time. This persistent by-product was completely depleted with g-C3N4 and natural sunlight in 50–70 min. According to the kinetics of by-products and spectrometry data a plausible transformation pathway has been proposed. Furthermore, the main active species involved in the photodegradation with g-C3N4 were study to fully understand the process. To accomplish this goal, different scavengers were introduced in the degradation of naproxen to quench possible superoxide radicals (·O2−), photoexcited holes (h+) and hydroxyl radicals (·OH).
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