烯啶虫胺在超高交联吸附树脂上的吸附性能研究

Adsorption properties of nitenpyram onto hypercrosslinked polymeric resins

研究了烯啶虫胺在NDA-150和NDA-1800超高交联吸附树脂上的静态吸附行为。静态吸附等温线表明:两种树脂对烯啶虫胺的吸附均为放热过程,吸附量随着温度的升高而降低,适当降低温度有利于吸附。吸附等温线符合Freundlich方程,为多分子层吸附。吸附速率随着温度的升高而增大,且表观活化能小于20KJ.mol-1,说明吸附较容易进行。NDA-150树脂对烯啶虫胺吸附及脱附性能较好,动态吸附量为351.1 mg.g-1。在323 K温度条件下,用95%乙醇作脱附剂,体积10BV(床体积)时,脱附率为96.43%。

The adsorption thermodynamics and kinetics of nitenpyram from aqueous solution onto the NDA-150 and NDA-1800 hy- percrosslinked polymeric resins were studied. The static adsorption isotherms indicated that the adsorption is an exothermic process, with a raised adsorption capacity under decreasing temperature. And the adsorption isotherms are well described by Frendrich equa- tion, suggesting a muhilayer adsorption. The kinetic experiment results demonstrated that the adsorption rate is improved by increas- ing temperature. The apparent activation energy is less than 20 · mol-1 which indicates a favorable adsorption. The efficiency of adsorption and desorption is excellent that of nitenpyram onto NDA-150 resin, the adsorption capacity is 351.1 mg· g-1, and de- sorption was operated with the 95% ethanol as desorption agent, under 323 K, the desorption rate reaches 96.43%, after the treat- ment with 10 BV of the solution mentioned above.