To realize the utilization of visible light and improve the photocatalytic efficiency of organic pollutant degradation in wastewater, a nitrogen-doped titanium-carbon composite (N-TiO₂/AC) prepared by sol-gel methods was applied in the photodegradation of phenol assisted by persulfate under visible light irradiation (named N-TiO₂/AC/PS/VIS). The results show that a synergistic effect exists between visible-light photocatalysis and persulfate activation. Compared with TiO₂/PS/VIS, the phenol degradation rate was found to be observably improved by 65% in the N-TiO₂/AC/PS/VIS system. This significant increase in degradation rate was mainly attributed to the following two factors: 1) The N and C doping can change the crystal structure of TiO₂, which extends the TiO₂ absorption wavelength range to the visible light region. 2) As an electron acceptor, PS can not only prevent electrons and holes from recombining with each other but can also generate strong oxidizing radicals such as ·SO₄⁻ and ·OH to accelerate the reaction dynamics. The process of phenol degradation was found to be consistent with the Langmuir pseudo-first-order kinetic model with an apparent rate constant k of 1.73 min⁻¹. The N-TiO₂/AC/PS/VIS process was proven to be a facile method for pollutant degradation with high pH adaptability, excellent visible-light utilization and good application prospects.

为了实现可见光的利用并提高废水中有机污染物降解的光催化效率，将溶胶-凝胶法制备的氮掺杂钛碳复合材料（N-TiO ₂ / AC）用于苯酚的光降解。在可见光照射下过硫酸盐（命名为N-TiO ₂ / AC / PS / VIS）。结果表明，可见光光催化与过硫酸盐活化之间存在协同作用。与TiO ₂ / PS / VIS相比，N-TiO _2中的苯酚降解率明显提高了65％。/ AC / PS / VIS系统。降解速率的显着提高主要归因于以下两个因素：1）N和C掺杂可以改变TiO ₂的晶体结构，从而将TiO _2的吸收波长范围扩展到可见光区域。2）作为电子受体，PS不仅可以防止电子和空穴从彼此重组，但也可以产生强氧化性基团，例如·SO ₄ ^-和OH·加速反应动力学。发现苯酚的降解过程与朗格缪尔拟一级动力学模型一致，其表观速率常数k为1.73 min ^-1。N-TiO ₂/ AC / PS / VIS工艺被证明是一种简便的污染物降解方法，具有高pH适应性，出色的可见光利用率和良好的应用前景。