Preparation of composite modified alkaline residue and its adsorption synthesis of phosphorus
In order to reduce the cost of agricultural phosphate fertilizer and prevent eutrophication of wa-ter environment,it is necessary to treat phosphorus in water.A modified adsorption material was prepared by boiling and oscillating with sodium hydroxide and sodium dodecyl sulfate from alkali residue,and was used to remove phosphorus from simulated wastewater.The effects of adsorbent dosage,solution pH,initial concen-tration of pollutants and adsorption time on phosphorus removal were investigated by batch adsorption experi-ments.The adsorption behavior was studied by isothermal adsorption model,kinetic model and thermodynam-ic model,and the adsorption mechanism was explored by XRF,XRD,SEM-EDS,FTIR and BET.The results showed that under the conditions of mass concentration of phosphorus 20 mg/L,dosage of composite modi-fied alkali residue 0.55 g/L,pH 6,adsorption time 30 min and temperature 25℃,the maximum phosphorus re-moval rate was 98.05%and adsorption capacity was 44.12 mg/g.The adsorption of phosphorus by the adsor-bent conforms to the Langmiur isothermal adsorption model,indicating that the adsorption process of phos-phorus by the adsorbent was mainly chemical adsorption of monolayer.
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