Samani Majid Riahi, Toghraie Davood
Department of civil Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran.
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran.
J Environ Health Sci Eng. 2019 Jan 3;17(1):53-62. doi: 10.1007/s40201-018-00325-y. eCollection 2019 Jun.
Polyaniline/ Sawdust /Poly Ethylene Glycol/ (PANi/SD/PEG) composite synthesized chemically is used as an adsorbent to remove hexavalent chromium from water. Adsorption experiments have been done in batch and continuous (column) mode. Some parameter such as pH, contact time, PANi/SD/PEG dose, isotherms in batch mode and pH, column bed depth and fluid flow rate in column mode were investigated. Result shows that PANi/SD/PEG has a good performance to remove hexavalent chromium ion from aqueous media. By presence of PEG, prepared composite has been homogenized and further absorption has been occurred. The best adsorption occurs under pH 2 and optimum contact time for removal of hexavalent chromium ion in batch experiment was about 30 min. Adsorption of Cr (VI) by PANi/SD/PEG fitted well in Langmuir isotherms. Maximum adsorption of hexavalent chromium was calculated 3.2 (mg/g). In column experiments, pH and column bed depth were found to be more prominent than fluid flow rate. Though, about 22% of Cr (VI) can be recovered using 0.1 M NaOH in the batch system, the recovered Cr (VI) in column system was less than 7.9%.
通过化学合成的聚苯胺/锯末/聚乙二醇（PANi/SD/PEG）复合材料被用作吸附剂，以去除水中的六价铬。吸附实验分别以分批和连续（柱）模式进行。研究了一些参数，如分批模式下的pH值、接触时间、PANi/SD/PEG剂量、等温线，以及柱模式下的pH值、柱床深度和流体流速。结果表明，PANi/SD/PEG具有良好的从水介质中去除六价铬离子的性能。由于聚乙二醇的存在，制备的复合材料变得均匀，进一步发生了吸附作用。最佳吸附发生在pH值为2的条件下，分批实验中去除六价铬离子的最佳接触时间约为30分钟。PANi/SD/PEG对Cr（VI）的吸附符合朗缪尔等温线。计算得出六价铬的最大吸附量为3.2（mg/g）。在柱实验中，发现pH值和柱床深度比流体流速更显著。虽然在分批系统中使用0.1 M NaOH可回收约22%的Cr（VI），但柱系统中回收的Cr（VI）不到7.9%。
