Visible-light activation of persulfate by TiO2/g-C3N4 photocatalyst toward efficient degradation of micropollutants
Visible-light activation of persulfate by TiO2/g-C3N4 photocatalyst toward efficient degradation of micropollutants
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TiO2/g-C3N4 光催化剂可见光活化过硫酸盐，有效降解微污染物
DOI：
10.1016/j.cej.2019.123245
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发表时间：
2020-03-15
影响因子：
15.1
通讯作者：
Jin, Pengkang
中科院分区：
文献类型：
--
作者：
Du, Xinyu;Bai, Xue;Jin, Pengkang
提出了一种新的TiO 2/g-C3 N4-PS体系，利用TiO 2/g-C3 N4异质结活化过硫酸盐（PS），提高可见光下污染物的光降解率。采用简单的煅烧法制备了TiO 2/g-C3 N4光催化剂，并以对乙酰氨基酚（AAP）为模型污染物，考察了该光催化体系的降解效率。结果表明，TiO 2/g-C3 N4-PS体系具有良好的PS活化活性和降解污染物的能力。结果表明，100 mL 5 mg/L AAP溶液在0.5 g/L光催化剂和2 mM PS的作用下，30 min内可基本完全降解，60 min内TOC可降低82.5%。加入PS后，TiO 2/g-C3 N4光催化体系的降解率比TiO 2/g-C3 N4体系提高了近13倍。自由基猝灭实验和电子顺磁共振（EPR）结果表明，SO 4中心点-、中心点OH和H+均有助于有机物的清除。此外，还将TiO 2/g-C3 N4-PS光催化体系用于苯酚、双酚A和卡马西平等典型微污染物的降解，并以真实的水体为基质进行了实验，结果表明，该体系具有较强的非选择性氧化降解污染物的能力。
A novel TiO2/g-C3N4-PS system was proposed, in which a TiO2/g-C3N4 heterojunction was used to activate persulfate (PS) to enhance pollutant photodegradation under visible-light irradiation. In this study, the TiO2/g-C3N4 photocatalyst was synthesized by a simple calcination method, and acetaminophen (AAP) was chosen as a model pollutant to test the degradation efficiency of the photocatalytic system. The TiO2/g-C3N4-PS system exhibits an efficient activity for PS activation and a high efficiency for pollutant degradation. The results show that 100 mL of a 5 mg/L AAP solution could be almost completely degraded in 30 min with 0.5 g/L photocatalyst and 2 mM PS, and TOC can be decreased by 82.5% in 60 min. After adding PS, the degradation rate of the TiO2/g-C3N4 photocatalytic system was greatly improved by nearly 13 times, compared to the TiO2/g-C3N4 system. The radical quenching experiments and electron paramagnetic resonance (EPR) results indicate that SO4 center dot-, center dot OH and H+ all contribute to eliminating organic compounds. Additionally, the TiO2/g-C3N4-PS photocatalytic system was employed to eliminate other typical micropollutants, such as phenol, bisphenol A and carbamazepine, and experiments were also carried out using real water matrices, and the ideal performance shows that the TiO2/g-C3N4-PS photocatalytic system has a strong nonselective oxidative ability for degrading contaminants.