Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan.
International Centre for Chemical and Biological Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi, 75270, Pakistan.
J Environ Manage. 2021 Apr 15;284:112017. doi: 10.1016/j.jenvman.2021.112017. Epub 2021 Jan 29.
The preservation of water and wastewater treatment has become a global challenge. The concentration of anions such as chlorides, fluorides, cyanides, and perchlorates above the permitted levels in water is harmful to human and aquatic life. Chlorfenapyr is an insecticide that contains the aforesaid anions and is abundantly present in industrial wastewater. This research is focused on the removal of these anions from wastewater by ethylene glycol functionalized benzyl dimethyl tetradecyl ammonium bromide immobilized on soluble polymer anion exchange membrane. The real wastewater samples rich in chlorfenapyr from two different sources (industrial and pond) were analyzed. Membrane efficiency was more than 50 ppm for each anion in a single fold. The double folds of membrane showed enhanced uptake and separation efficiency for chloride, fluoride, and cyanide from wastewater samples between 0.01 and 0.02 ppm down to lethal concenetrations values (LD 50). The membrane shows maximum separation efficiency between the pH ranges of 6-7. The interference effect on membrane separation efficiency showed that the replacement ability of sample anions was in the order of fluoride > chloride > perchlorate > cyanide. This high replacement efficiency of fluoride and chloride is attributed to the more chemical interactions of these anions with membrane.
保护水资源和废水处理已成为全球性挑战。水中的阴离子（如氯化物、氟化物、氰化物和高氯酸盐）浓度超过允许水平，对人类和水生生物有害。氯芬pyr 是一种杀虫剂，含有上述阴离子，并且在工业废水中大量存在。本研究专注于通过乙二醇功能化苄基二甲基十四烷基溴化铵固定在可溶聚合物阴离子交换膜上来去除废水中的这些阴离子。对来自两个不同来源（工业和池塘）的富含氯芬pyr 的实际废水样品进行了分析。对于每种阴离子，膜在单次折叠时的效率超过 50ppm。对于 0.01 至 0.02ppm 之间的废水样品，膜的两倍折叠显示出增强的氯化物、氟化物和氰化物的吸收和分离效率，直至达到致死浓度值（LD50）。该膜在 pH 值为 6-7 的范围内显示出最大的分离效率。对膜分离效率的干扰影响表明，样品阴离子的取代能力顺序为氟化物>氯化物>高氯酸盐>氰化物。这种氟化物和氯化物的高取代效率归因于这些阴离子与膜之间的更多化学相互作用。
