Duong Hoa T T, Duong Mai T P, Nguyen Oanh K, Le Son T, Dang Long V, Nguyen Binh T, Do Dang V
Faculty of Chemistry, VNU University of Science, Vietnam National University, Ha Noi 19 Le Thanh Tong Hoan Kiem, Hanoi 100000, Vietnam.
J Anal Methods Chem. 2022 Mar 22;2022:5531219. doi: 10.1155/2022/5531219. eCollection 2022.
In the present study, the photocatalytic activity of Ti-SBA-15/CN catalysts was investigated to degrade 2,4-Dichlorophenoxyacetic acid (2,4-D) herbicides in water under visible light irradiation. The catalysts were synthesized via a simple hydrothermal method and characterized by various analytical techniques, including SAXS, N adsorption-desorption isotherms, Zeta potential, PL, FT-IR, XRF, TGA, and UV-DRS. Our study indicated that the 2.5Ti-SBA-15/CN had higher efficiency in the degradation of 2,4-D than Ti-SBA-15 and CN. The decomposition of 2,4-D reached 60% under 180 minutes of visible light irradiation at room temperature on 2.5Ti-SBA-15/CN. Moreover, the degradation of 2,4-D on Ti-SBA-15/CN was pseudo-first-order kinetics with the highest rate constant (0.00484 min), which was much higher than that obtained for other photocatalysts reported recently. Furthermore, the catalyst can be reused at least two times for photodegradation of 2,4-D solution under visible light irradiation within a slight decrease in catalytic activity.
在本研究中，研究了Ti-SBA-15/CN催化剂在可见光照射下对水中2,4-二氯苯氧乙酸（2,4-D）除草剂的光催化活性。通过简单的水热法合成了催化剂，并采用多种分析技术对其进行了表征，包括小角X射线散射（SAXS）、N吸附-脱附等温线、Zeta电位、光致发光（PL）、傅里叶变换红外光谱（FT-IR）、X射线荧光光谱（XRF）、热重分析（TGA）和紫外可见漫反射光谱（UV-DRS）。我们的研究表明，2.5Ti-SBA-15/CN在降解2,4-D方面比Ti-SBA-15和CN具有更高的效率。在室温下，在2.5Ti-SBA-15/CN上进行180分钟的可见光照射后，2,4-D的分解率达到60%。此外，2,4-D在Ti-SBA-15/CN上的降解符合准一级动力学，速率常数最高（0.00484 min⁻¹），远高于最近报道的其他光催化剂。此外，该催化剂在可见光照射下对2,4-D溶液进行光降解时可重复使用至少两次，催化活性略有下降。
