Abstract

In this research, the self-cleaning property of Al-doped ZnO nanoparticles prepared via the sonochemical method was investigated. The photocatalytic and hydrophilic activities of nanoparticles were studied while being applied as an additive into the waterborne acrylic resin-based coating. The influence of various doping amounts of Al with ZnO has been evaluated in terms of crystallographic structures, morphologies, optical properties, etc. using XRD, TEM, EDS, and UV–Vis analysis. Hexagonal and rod-like nanoparticles were revealed as the dominant morphology for the low and high dosage of doped Al, respectively. The photocatalytic activity of coating was studied using methyl orange by exposing them to ultraviolet (UV) irradiation. Results showed that acrylic coating with doped nanoparticles represented higher degradation, in comparison with the pure ZnO nanoparticles. The rate of degradation of 5% Al-doped nanoparticles was found to be higher than that of other samples. Furthermore, the hydrophilic property of the coating was determined by measuring the water droplet contact angle with the surface under UV irradiation. The results showed that the resin coating with doped nanoparticles represented a lower contact angle, compared to the pure ZnO nanoparticles. The least angle equal to 21° was achieved at 7% Al-doped sample after 180 min UV irradiation. Kinetic studies showed that the degradation of methyl orange corresponds well with the first-order reaction.

摘要

本研究对声化学法制备的Al掺杂ZnO纳米粒子的自清洁性能进行了研究。在将纳米粒子作为添加剂应用于水性丙烯酸树脂基涂料中时，研究了纳米粒子的光催化和亲水活性。已经使用 XRD、TEM、EDS 和 UV-Vis 分析在晶体结构、形态、光学性质等方面评估了 Al 与 ZnO 的各种掺杂量的影响。六角形和棒状纳米粒子分别被揭示为低剂量和高剂量掺杂铝的主要形态。通过将甲基橙暴露于紫外线 (UV) 照射来研究涂层的光催化活性。结果表明，掺杂纳米粒子的丙烯酸涂层表现出更高的降解，与纯 ZnO 纳米颗粒相比。发现 5% Al 掺杂纳米粒子的降解率高于其他样品。此外，涂层的亲水性是通过在紫外线照射下测量水滴与表面的接触角来确定的。结果表明，与纯 ZnO 纳米颗粒相比，掺杂纳米颗粒的树脂涂层具有较低的接触角。在 180 分钟紫外线照射后，在 7% Al 掺杂样品上实现了等于 21° 的最小角度。动力学研究表明，甲基橙的降解与一级反应很好地对应。涂层的亲水性是通过在紫外线照射下测量水滴与表面的接触角来确定的。结果表明，与纯 ZnO 纳米颗粒相比，掺杂纳米颗粒的树脂涂层具有较低的接触角。在 180 分钟紫外线照射后，在 7% Al 掺杂样品上实现了等于 21° 的最小角度。动力学研究表明，甲基橙的降解与一级反应很好地对应。涂层的亲水性是通过在紫外线照射下测量水滴与表面的接触角来确定的。结果表明，与纯 ZnO 纳米颗粒相比，掺杂纳米颗粒的树脂涂层具有较低的接触角。在 180 分钟紫外线照射后，在 7% Al 掺杂样品上实现了等于 21° 的最小角度。动力学研究表明，甲基橙的降解与一级反应很好地对应。