The high band gap of zinc oxide(ZnO)has significantly limited its potential application for organic contaminant removal in photocatalysis.In this study,ZnO/halloysites(HNTs)composites(ZnO/HNTs)were prepared using a hi...The high band gap of zinc oxide(ZnO)has significantly limited its potential application for organic contaminant removal in photocatalysis.In this study,ZnO/halloysites(HNTs)composites(ZnO/HNTs)were prepared using a high-temperature calcination method to enhance the removal of tetracycline hydrochloride(TCH).The experimental results demonstrated that the band gap of ZnO/HNTs decreased to 3.12 eV,compared to 3.21 eV for pure ZnO.The observed removal rate(k_(obs))of TCH in the ZnO/HNTs/vis system was 1.90×10^(-2) min^(-1),significantly higher than the rates in the HNTs/vis(1.25×10^(-3)min^(-1))and ZnO/vis(1.13×10^(-2) min^(-1))systems.Additionally,ZnO/HNTs exhibited strong resistance to coexisting natural organic and inorganic matter,maintaining high pollutant removal efficiency in natural water samples.The ZnO/HNTs/vis system also effectively removed other common organic pollutants,such as ciprofloxacin and methylene blue.Cycle tests indicated that the ZnO/HNTs/vis system retained 65.57%of its original efficiency,demonstrating good reusability and versatility.Scavenging and electron paramagnetic resonance experiments identified that h+was the primary species in the ZnO/HNTs/vis system,with other species playing auxiliary roles in TCH degradation.This study provides valuable insights into the design of novel ZnO-based photocatalysts for the degradation of organic pollutants in water.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52270149,51908528,2200013)Natural Science Foundation of Henan Province,China(No.242300421443)+1 种基金The Science and Technology Key Project of Henan Province,China(No.242102321073)Doctoral Fund Project of Henan University of Technology,China(Nos.2020BS005,2023BS004).
文摘The high band gap of zinc oxide(ZnO)has significantly limited its potential application for organic contaminant removal in photocatalysis.In this study,ZnO/halloysites(HNTs)composites(ZnO/HNTs)were prepared using a high-temperature calcination method to enhance the removal of tetracycline hydrochloride(TCH).The experimental results demonstrated that the band gap of ZnO/HNTs decreased to 3.12 eV,compared to 3.21 eV for pure ZnO.The observed removal rate(k_(obs))of TCH in the ZnO/HNTs/vis system was 1.90×10^(-2) min^(-1),significantly higher than the rates in the HNTs/vis(1.25×10^(-3)min^(-1))and ZnO/vis(1.13×10^(-2) min^(-1))systems.Additionally,ZnO/HNTs exhibited strong resistance to coexisting natural organic and inorganic matter,maintaining high pollutant removal efficiency in natural water samples.The ZnO/HNTs/vis system also effectively removed other common organic pollutants,such as ciprofloxacin and methylene blue.Cycle tests indicated that the ZnO/HNTs/vis system retained 65.57%of its original efficiency,demonstrating good reusability and versatility.Scavenging and electron paramagnetic resonance experiments identified that h+was the primary species in the ZnO/HNTs/vis system,with other species playing auxiliary roles in TCH degradation.This study provides valuable insights into the design of novel ZnO-based photocatalysts for the degradation of organic pollutants in water.
