Yang Chen, Yi Chuan, Liao Qi, Li Na, Zhao Yufeng
Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission, College of Resources and Environmental Science, South-Central Minzu University, Wuhan, People's Republic of China.
Hubei Provincial Academy of Eco-Environmental Sciences (Provincial Appraisal Center for Ecological and Environmental Engineering), Wuhan, People's Republic of China.
Environ Technol. 2023 Oct;44(24):3667-3675. doi: 10.1080/09593330.2022.2068382. Epub 2022 Apr 28.
In this study, CN codoped TiO nanoparticles (CN-TiO) were fabricated by solvothermal and low temperature calcination methods with the aid of ultrasonication. According to the number of ultrasonic treatments used in the preparation process, the samples were named NN, YN, NY and YY. The characteristics of transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible spectroscopy (UV-vis) were employed to analyse the effect of the ultrasonic treatment step in the synthetic process. The results showed that ultrasonication can increase the CN content in TiO, reduce the band gap energy, and improve the catalytic performance of the CN-TiO, and the effect of secondary ultrasound is particularly obvious. The YY obtained by two-step ultrasonication with the lowest band gap energy of 3.07 eV. The photocatalytic activity of the CN-TiO was evaluated using the degradation of diclofenac (DCF) under visible light irradiation (white LED strips with an emission wavelength of 450 nm). It was observed that the YY exhibited significantly superior DCF degradation activity. When using 0.4 g L of YY, an excellent DCF degradation of 97% could be reached, which is 1.4 times that of NN (without ultrasonication). Moreover, YY had good visible light photocatalytic activity, and the degradation efficiency of YY for DCF under visible light was comparable to that of a xenon lamp. Therefore, ultrasonication played a critical role in the enhancement of photocatalytic activity during the synthesis of CN-TiO.
在本研究中，借助超声处理，通过溶剂热法和低温煅烧法制备了碳氮共掺杂二氧化钛纳米颗粒（CN-TiO）。根据制备过程中使用的超声处理次数，将样品命名为NN、YN、NY和YY。采用透射电子显微镜（TEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）和紫外-可见光谱（UV-vis）等手段，分析超声处理步骤在合成过程中的作用。结果表明，超声处理可提高TiO中CN的含量，降低带隙能量，提高CN-TiO的催化性能，二次超声的效果尤为明显。经两步超声处理得到的YY带隙能量最低，为3.07 eV。以双氯芬酸（DCF）在可见光照射（发射波长为450 nm的白色LED灯带）下的降解情况评估CN-TiO的光催化活性。结果发现，YY表现出显著优越的DCF降解活性。当使用0.4 g·L的YY时，DCF的降解率可达97%，是NN（未进行超声处理）的1.4倍。此外，YY具有良好的可见光光催化活性，其在可见光下对DCF的降解效率与氙灯相当。因此，超声处理在CN-TiO合成过程中对光催化活性的增强起着关键作用。
