粉煤灰镧改性吸附水中磷的性能研究 米

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LIANGXuhua’，SHIJiahao2，HANFei2 （1.Tangshan Municipal Construction Corporation，Tangshan， O63OOo，China；

.SUHUUI UI UIvI au IIauspuIauUn EngeCIng，IIeDel UmveIsiy Ul ICUHuIugy，IaIJI， JUUU1，UHa） Abstract：Lanthanum-modifiedflyash（La-FA）waspreparedbymixingflyashwithpotassumcarbonateandimpregnatinglanthanum nitrate.Itwascharacteriedbyvariousmeansandusedintheadsorptionofphosphorouscontainingwastewater.Thesurfaceofa-FAhas manyporesandmoreadsorptionsitesandhydroxylfunctinalgroups，andthecontentofsiliconandaluminumwasincreasedtofacilitate the adsorption of phosphorus. The increase in pH caused the potential of the La-FA surface to gradually decrease，and its zero potential has a pH of 5.8.The adsorption results showed that when the initial phosphorus mass concentration was 30mg/L ，the temperature was 20 ，the solution pH was 4.1，the La-FA dosage was 2g/L ，and the adsorption time was 2O min，the phosphorus removal rate reached （204 98% ，and the adsorption capacity was 24.13 mg/ g .The adsorption process of La-FA on phosphorus can be divided into three stages， whichconformtoheLangmuirisothermaladsorptionmodelandquasisecondarykineticmodel，theadsorptiocanbecariedout spontaneously，the reaction process is endothermic，and the adsorption mechanism is ion exchange.

Keywords：fly ash；Lanthanum modified；adsorption；phosphorus

0引言

水中过量的磷会导致水体富营养化，可能造成溶解氧的过饱和状态，影响水生动物的生存。（剩余5836字）