Hiep Hoang, Tuan Anh Pham, Dao Van-Duong, Viet Quang Dang
Academy for Green Growth, Vietnam National University of Agriculture, Gia Lam, Hanoi, Vietnam.
Falcuty of Biotechnology, Chemistry and Environmental Engineering, Phenikaa University, Hanoi 12116, Vietnam.
J Anal Methods Chem. 2023 Jul 11;2023:3806240. doi: 10.1155/2023/3806240. eCollection 2023.
TiO nanoparticles have emerged as a great photocatalyst to degrade organic contaminants in water; however, the nanoparticles dispersed in water could be difficult to be recovered and potentially become contaminant. Herbicide like 2,4-dichlorophenoxyacetic acid (2,4-D) used in agriculture usually ends up with a large fraction remaining in water and sediment, which may cause potential risk to human health and the ecosystem. This study proposes a greener method to utilize TiO as photocatalyst to remove 2,4-D from water. Accordingly, TiO nanoparticles (10-45 nm) were synthesized and grafted on lightweight fired clay to generate a TiO-based floating photocatalyst. Experimental testing revealed that 60.2% of 2,4-D (0.1 mM) can be decomposed in 250 min under UV light with TiO-grafted lightweight fired clay floating on water. Degradation fits well into the pseudo-first-order kinetic model. The floating photocatalysts can degrade approximately 50% 2,4-D in 250 min under sunlight and the degradation efficiency is stable for cycles. The results revealed that the fabrication of floating photocatalyst could be a promising and greener way to remove herbicide contaminants in water using TiO.
二氧化钛纳米颗粒已成为一种用于降解水中有机污染物的优良光催化剂；然而，分散在水中的纳米颗粒可能难以回收，并且有可能成为污染物。农业中使用的除草剂，如2,4-二氯苯氧乙酸（2,4-D），通常有很大一部分残留在水和沉积物中，这可能对人类健康和生态系统造成潜在风险。本研究提出了一种更环保的方法，利用二氧化钛作为光催化剂从水中去除2,4-D。因此，合成了二氧化钛纳米颗粒（10 - 45纳米）并将其接枝到轻质烧制粘土上，以制备一种基于二氧化钛的漂浮光催化剂。实验测试表明，在紫外光下，当接枝了二氧化钛的轻质烧制粘土漂浮在水面上时，250分钟内可分解60.2%的2,4-D（0.1毫摩尔）。降解符合准一级动力学模型。在阳光下，漂浮光催化剂在250分钟内可降解约一半的2,4-D，且降解效率在循环过程中保持稳定。结果表明，制备漂浮光催化剂可能是一种利用二氧化钛去除水中除草剂污染物的有前景且更环保的方法。
