Kyriakopoulos Grigorios, Hourdakis Adamadia, Doulia Danae
Chemical Engineering Department, National Technical University of Athens, Zografou Campus, Athens, Greece.
J Environ Sci Health B. 2003 Mar;38(2):157-68. doi: 10.1081/PFC-120018446.
The objective of this work was to assess the capability of organic hydrophobic polymeric resins Amberlite XAD-4 and XAD-7 to remove the pesticides alachlor and amitrole from water. The pesticides adsorption on the two different adsorbents was measured by batch equilibrium technique and isotherm types and parameters were estimated. Two theoretical models were applied based on a Freundlich and a Langmuir isotherms. The effect of pesticides chemical composition and structure as well as the nature of solid surface on the efficiency of adsorption was evaluated. The influence of pH also was studied. In low pH solutions adsorption of amitrole was higher upon the nonionic aliphatic acrylic ester copolymer XAD-7 in comparison to the nonionic, crosslinked macroreticular copolymer of styrene divinylbenzene XAD-4. In neutral and intermediate pH solutions the polar acrylic ester copolymer XAD-7 was more effective to the retention of alachlor. The acrylic ester copolymer showed at pH 3 the lower effectiveness in alachlor removal from water. The data of the adsorption isotherms of pesticides upon the examined polymeric resins seemed to conform to both the Freundlich and the Langmuir isotherm models.
这项工作的目的是评估有机疏水聚合物树脂Amberlite XAD - 4和XAD - 7从水中去除农药甲草胺和杀草强的能力。通过批量平衡技术测量了农药在两种不同吸附剂上的吸附情况，并估算了等温线类型和参数。基于弗伦德里希等温线和朗缪尔等温线应用了两种理论模型。评估了农药的化学成分和结构以及固体表面性质对吸附效率的影响。还研究了pH值的影响。在低pH值溶液中，与苯乙烯二乙烯基苯的非离子交联大孔共聚物XAD - 4相比，非离子脂肪族丙烯酸酯共聚物XAD - 7对杀草强的吸附更高。在中性和中等pH值溶液中，极性丙烯酸酯共聚物XAD - 7对甲草胺的保留更有效。丙烯酸酯共聚物在pH值为3时从水中去除甲草胺的效果较低。所研究的聚合物树脂上农药吸附等温线的数据似乎符合弗伦德里希等温线模型和朗缪尔等温线模型。
