Z-Scheme TiO2/g-C3N4 活化过一硫酸盐去除有机污染物：性质和机制,ChemistrySelect

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Z-Scheme TiO2/g-C3N4 活化过一硫酸盐去除有机污染物：性质和机制
ChemistrySelect ( IF 1.9 ) Pub Date : 2023-07-18 , DOI: 10.1002/slct.202204612
Yujie Zhang _{1,

2} , Xuechang Ren ₂ , Linhai Yang ₂ , Huijuan Wang ₁ , Juxiang Chen ₁ , Jinhui Li ₁ , Rong Wang ₁

Affiliation

采用铵盐辅助水热-高温煅烧法构建TiO 2 /gC 3 N 4 杂化物(TCNs)，并用于活化过一硫酸盐(PMS)降解多种模拟污染物。其PL光谱、瞬态_光电流_和奈奎斯特_电位阻抗谱表明TCN1-4具有更好的电子-空穴对分离能力，这是由于TiO ₂和gC ₃ N4之间形成了Z型异质结。另外，(NH ₄ ) ₂ SO ₄作为气泡模板可以显着增加TCN1-4的比表面积。基于以上两点，TCN1-4具有优异的光催化活化性能。TCN1-4/PMS系统在30分钟内总共可以去除93.8%的RhB，这与TCN1/PMS系统中60分钟的去除相当，并且远高于gC 3 N ₄ / _PMS和_二氧化钛TCN1-4/PMS系统在第五次循环的阳光下30min后降解率仍能保持在94%。TCN1-4/PMS系统对MO、MB和苯酚也有优异的降解效果，相同反应条件下，MO（76 μmol/L）、MB（78 μmol/L）和苯酚（265 μmol/L）的降解率分别为91.1%、94.2%和45.6%。自由基猝灭实验和TA测试表明TCN1-4/PMS反应体系中存在自由基(⋅OH、SO ₄ ⋅ ⁻、⋅O ₂⁻ )、非自由基( ¹ O ₂ )和h ^{+ 。}

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Z-Scheme TiO2/g-C3N4 Activation of Peroxymonosulfate to Remove Organic Pollutants: Properties and Mechanism

TiO₂/g-C₃N₄ hybrids (TCNs) were constructed by an ammonium salt-assisted hydrothermal-high temperature calcination method and used to activate peroxymonosulfate (PMS) to degrade multiple simulated pollutants.The PL spectra, transient photocurrents and Nyquist pots of the impedance spectra indicate that TCN1-4 has a better separation of electron-hole pairs, which is due to the formation of Z-scheme heterojunctions between TiO₂ and g-C₃N4. In addition, (NH₄)₂SO₄ as a bubble template could significantly increase the specific surface area of TCN1-4. Based on the above two points, TCN1-4 has excellent photocatalytic activation performance. A total of 93.8 % of RhB can be removed in 30 min in the TCN1-4/PMS system, which is comparable to the 60 min removal in the TCN1/PMS system and much higher than that in the g-C₃N₄/PMS and TiO₂/PMS systems.The degradation of the TCN1-4/PMS system can still be maintained at 94 % after 30 min under sunlight in the fifth cycle.TCN1-4/PMS system also has an excellent degradation effect on MO, MB and phenol, under the same reaction conditions, the degradation of MO (76 μmol/L), MB (78 μmol/L) and phenol (265 μmol/L) was 91.1 %, 94.2 % and 45.6 %, respectively. The radical quenching experiment and TA test demonstrate that free radicals (⋅OH, SO₄⋅⁻, ⋅O₂⁻), nonradicals (¹O₂) and h⁺ existed in the TCN1-4/PMS reaction system.

更新日期：2023-07-19

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