Department of Civil Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran.
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran.
Sci Rep. 2021 Sep 27;11(1):19117. doi: 10.1038/s41598-021-97518-7.
There are currently heavy metals in most industrial effluents which are among the most significant environmental pollutants. Hexavalent chromium is one of the most significant heavy metals. In this research for the first time, eliminating the hexavalent chromium from the aqueous medium/aquedia applying bee carcasses and corpses modified with polyethylene was examined. Adsorption experiments were conducted discontinuously on laboratory solutions, including hexavalent chromium. The optimal adsorption conditions such as different pH factors, contact time, initial chromium concentration, and adsorbent value on the adsorption rate were examined at different levels, and adsorption isotherms were plotted. Some adsorbent properties were examined using Field Emission Scanning Electron Microscopy, XRD analysis, Fourier Transform Infrared Spectroscopy, and BET test to study the properties of the synthesized adsorbent. This study indicated that the highest percentage of removal related to polyethylene composite and bee carcasses in the presence of polyethylene glycol was 50.56% among the bee carcasses composites. The parameters effective on the adsorption process for polyethylene composite and bee carcasses and losses in the presence of polyethylene glycol suggested that the adsorption percentage increased for this composite by decreasing the pH, increasing the contact time, and increasing the adsorbent. The highest percentage of adsorption was obtained when the pH was 2, the contact time was 120 min and the adsorbent value was 8 g/L and the initial concentration of chromium was 100 ppm. The most optimal removal percentage was achieved at the pH = 2, the contact time was 30 min, and the adsorbent value was 2 g/L, and the initial chromium concentration was 100 ppm. The results of drawing adsorption isotherms also indicated that higher R had a better fit than Langmuir for polyethylene composite and bee carcasses in the polyethylene glycol Freundlich equation.
目前，大多数工业废水中都含有重金属，它们是最重要的环境污染物之一。六价铬是最重要的重金属之一。在这项研究中，首次研究了用经过聚乙烯改性的蜜蜂尸体和尸体从水介质/水相中去除六价铬。在实验室溶液中连续进行了吸附实验，包括六价铬。在不同水平上检查了不同 pH 值因素、接触时间、初始铬浓度和吸附剂值对吸附率的影响，绘制了吸附等温线。通过场发射扫描电子显微镜、XRD 分析、傅里叶变换红外光谱和 BET 测试研究了合成吸附剂的性质，对一些吸附剂性质进行了研究。本研究表明，在聚乙二醇存在的情况下，聚乙烯复合材料和蜜蜂尸体的去除率最高为 50.56%。吸附过程参数和聚乙烯复合材料和蜜蜂尸体的损失在聚乙二醇存在下表明，通过降低 pH 值、增加接触时间和增加吸附剂，这种复合材料的吸附百分比增加。当 pH 值为 2、接触时间为 120 分钟、吸附剂值为 8 g/L 且铬的初始浓度为 100 ppm 时，吸附百分比最高。当 pH 值为 2、接触时间为 30 分钟、吸附剂值为 2 g/L 且铬的初始浓度为 100 ppm 时，达到最佳去除百分比。绘制吸附等温线的结果也表明，对于聚乙烯复合材料和蜜蜂尸体，在聚乙二醇中，Freundlich 方程的 R 较高比 Langmuir 方程更适合。
