Danyliuk Nazarii, Tatarchuk Tetiana, Kannan Karthik, Shyichuk Alexander
Educational and Scientific Center of Material Science and Nanotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine.
Department of Chemistry, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine; School of Life and Allied Health Sciences, Glocal University, Saharanpur, India.
Water Sci Technol. 2021 Jul;84(2):469-483. doi: 10.2166/wst.2021.236.
Color images taken by a smartphone camera were used to estimate the rate of advanced photo-oxidation reaction of Direct Red 23 (DR23) azo dye as a model organic pollutant. The red, green, blue color coordinates were tested to quantify the dye. Images of the reaction mixture were taken at specified intervals to obtain kinetic lines and reaction rate constants. Both the reaction rate constant and the final degree of degradation were plotted as functions of the photocatalyst dose and the concentration of HO. The smartphone measurements are fully consistent with the reference spectrophotometry data. The maximum degradation efficiency of the DR23 dye was recorded at C(HO) = 2.5 mM and photocatalyst dose equal to 1.0 mg/L. Higher HO concentrations reduce the degradation rate as a result of the side reaction of HO with OH radicals. A two-factor experimental design was used to study the effects of photocatalyst dose and HO concentration with five and seven levels, respectively. The analysis of variance results indicated that the concentration of HO had the greater influence. The smartphone provides quick and easy measurement of the photodegradation rate directly in the solutions without sampling. The proposed approach can be applied under field conditions in wastewater treatment plants.
使用智能手机相机拍摄的彩色图像来估算作为典型有机污染物的直接红23（DR23）偶氮染料的高级光氧化反应速率。测试红、绿、蓝颜色坐标以量化染料。在指定时间间隔拍摄反应混合物的图像，以获得动力学曲线和反应速率常数。将反应速率常数和最终降解程度都绘制为光催化剂剂量和HO浓度的函数。智能手机测量结果与参考分光光度法数据完全一致。在C(HO) = 2.5 mM且光催化剂剂量等于1.0 mg/L时，记录到DR23染料的最大降解效率。由于HO与羟基自由基的副反应，较高的HO浓度会降低降解速率。采用二因素实验设计分别研究了具有五个和七个水平的光催化剂剂量和HO浓度的影响。方差分析结果表明，HO浓度的影响更大。智能手机可直接在溶液中快速简便地测量光降解速率，无需取样。所提出的方法可应用于污水处理厂的现场条件。
