Mohamed Walied A A, Handal Hala T, Ibrahem Ibrahem A, Galal Hoda R, Mousa Hanan A, Labib Ammar A
Photochemistry and Nanomaterials Lab, Inorganic Chemistry Department, National Research Centre, Cairo 12622, Egypt.
Inorganic Chemistry Department, National Research Centre, Cairo, Egypt.
J Hazard Mater. 2021 Feb 15;404(Pt B):123962. doi: 10.1016/j.jhazmat.2020.123962. Epub 2020 Oct 5.
Solar photocatalytic activity of zinc oxide quantum dots (ZOQDs) was investigated and two samples of ZOQDs were synthesized by solvothermal method and characterized using different spectroscopic techniques. Crystal and morphological properties were obtained from XRD and HRTEM showed the purity, high crystallinity single phase and the elongated shape of prepared quantum dots. The measured crystallite size of the S1 and S2 samples is 8.4 and 9.6 nm respectively. The results of BET analysis and the optical properties of the samples shown that the first sample have larger values for both the specific surface area and band gap energy. Estimation of the photocatalytic performance indicated that the first sample give the best degradation rate of the synthetic Dianix Blue dye (DB) dye (2.47 × 10 s). Likewise, in the photo-oxidation of coumarin, the sample with the smallest particle size achieves the highest by 20% fluorescence rate than the largest particle size sample. In addition, the work included a study of the mineralization and recycling efficiency of industrial wastewater as a study case in the presence of different doses of ZOQDs by sun light for a one year and this evaluation done according to Egyptian allowed COD limit according to local environmental ministry law.
研究了氧化锌量子点（ZOQDs）的太阳光催化活性，通过溶剂热法合成了两个ZOQDs样品，并使用不同的光谱技术对其进行了表征。通过XRD获得了晶体和形态学性质，HRTEM显示了制备的量子点的纯度、高结晶度单相和细长形状。S1和S2样品的测量微晶尺寸分别为8.4和9.6nm。BET分析结果和样品的光学性质表明，第一个样品的比表面积和带隙能量值都较大。光催化性能评估表明，第一个样品对合成的 Dianix 蓝染料（DB）的降解率最佳（2.47×10 s）。同样，在香豆素的光氧化中，粒径最小的样品比粒径最大的样品实现的荧光率最高，高出20%。此外，该工作包括以工业废水的矿化和循环效率为研究案例，在不同剂量的ZOQDs存在下，通过太阳光照射一年进行研究，并根据埃及当地环境部法律允许的COD限值进行评估。
