Salmani M H, Mokhtari M, Raeisi Z, Ehrampoush M H, Sadeghian H A
Department of Environmental Health Engineering, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, I. R. Iran.
Environmental Science and Technology Research, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, I. R. Iran.
Water Sci Technol. 2017 Sep;76(5-6):1466-1473. doi: 10.2166/wst.2017.318.
Wastewater containing pharmaceutical residual components must be treated before being discharged to the environment. This study was conducted to investigate the efficiency of tungsten-carbon nanocomposite in diclofenac removal using design of experiment (DOE). The 27 batch adsorption experiments were done by choosing three effective parameters (pH, adsorbent dose, and initial concentration) at three levels. The nanocomposite was prepared by tungsten oxide and activated carbon powder in a ratio of 1 to 4 mass. The remaining concentration of diclofenac was measured by a spectrometer with adding reagents of 2, 2'-bipyridine, and ferric chloride. Analysis of variance (ANOVA) was applied to determine the main and interaction effects. The equilibrium time for removal process was determined as 30 min. It was observed that the pH had the lowest influence on the removal efficiency of diclofenac. Nanocomposite gave a high removal at low concentration of 5.0 mg/L. The maximum removal for an initial concentration of 5.0 mg/L was 88.0% at contact time of 30 min. The results of ANOVA showed that adsorbent mass was among the most effective variables. Using DOE as an efficient method revealed that tungsten-carbon nanocomposite has high efficiency in the removal of residual diclofenac from the aqueous solution.
含有药物残留成分的废水在排放到环境之前必须进行处理。本研究旨在通过实验设计（DOE）来研究钨-碳纳米复合材料去除双氯芬酸的效率。通过在三个水平上选择三个有效参数（pH值、吸附剂剂量和初始浓度）进行了27次批次吸附实验。纳米复合材料由氧化钨和活性炭粉末按质量比1:4制备而成。双氯芬酸的剩余浓度通过添加2,2'-联吡啶和氯化铁试剂的光谱仪进行测量。采用方差分析（ANOVA）来确定主要和交互作用效应。去除过程的平衡时间确定为30分钟。观察到pH值对双氯芬酸去除效率的影响最小。纳米复合材料在低浓度5.0mg/L时具有较高的去除率。在接触时间为30分钟时，初始浓度为5.0mg/L的最大去除率为88.0%。方差分析结果表明吸附剂质量是最有效的变量之一。使用实验设计作为一种有效方法表明，钨-碳纳米复合材料在从水溶液中去除残留双氯芬酸方面具有很高的效率。
