Photocatalyst TiO₂@g-CQDs were prepared by one-step sol-gel method using tetrabutyl titanate, anhydrous ethanol, hydrochloric acid and graphite carbon quantum dots and characterized by high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD), UV–visible diffuse reflectance spectra (UV-DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic degradation of nonylphenol ethoxylate (NPE₁₀O) by TiO₂@g-CQDs and the degradation path of NPE₁₀O by time-of-flight mass spectrometry (TOF-MS) were investigated. In addition, the photocatalytic mechanism of TiO₂@g-CQDs was discussed in detail and the major active species were identified. The results showed that when the doping amount of g-CQDs is 5%, the amount of TiO₂@g-CQDs is 0.1 g·L⁻¹, the initial concentration of NPE₁₀O is 50 mg·L⁻¹, and the power of the light source is 500 W, the degradation efficiency of NPE₁₀O can reach 100% at 60 min, which indicates TiO₂@g-CQDs have excellent photocatalytic properties. TOF-MS showed that NPE₁₀O was mainly degraded by nonylphenol polyethoxycarboxylate (NPExC) and carboxylated alkyl oxidation products of nonylphenol ethoxy (CAyPEC) intermediates during photocatalytic degradation. Trapping experiment of active species demonstrated that OH is the major active component for photocatalytic degradation of contaminant.

用钛酸四丁酯，无水乙醇，盐酸和石墨碳量子点通过一步溶胶-凝胶法制备光催化剂TiO ₂ @ g-CQDs，并通过高分辨率透射电镜（HRTEM），傅里叶变换红外光谱（FT）表征。 -IR），X射线衍射（XRD），UV可见漫反射光谱（UV-DRS）和X射线光电子能谱（XPS）。研究了TiO ₂ @ g-CQDs对壬基酚乙氧基化物（NPE ₁₀ O）的光催化降解以及飞行时间质谱（TOF-MS）对NPE ₁₀ O的降解途径。此外，TiO ₂的光催化机理对g-CQDs进行了详细讨论，并确定了主要的活性物种。结果表明，当g-CQDs的掺杂量为5％时，TiO ₂ @ g-CQDs的掺杂量为0.1 g·L ^-1，NPE ₁₀ O的初始浓度为50 mg·L ^-1，光源的功率为500 W，NPE ₁₀ O在60分钟时的降解效率可达到100％，这表明TiO ₂ @ g-CQDs具有优异的光催化性能。TOF-MS显示NPE ₁₀在光催化降解过程中，O主要被壬基酚聚乙氧基羧酸酯（NPExC）和壬基酚乙氧基（CAyPEC）中间体的羧化烷基氧化产物降解。活性物种的诱捕实验表明，OH是光催化降解污染物的主要活性成分。