Performance Evaluation of La/Mg Modified Sepiolite Microspheres for Adsorption of Phosphorus in Black-Odorous Water Body
Phosphorus is one of the key factors for black-odorous water body formation.Therefore,it is crucial to control the phosphorus of black-odorous water body in an environmentally friendly and efficient way.In this study,La/Mg modified sepiolite gel microspheres(La/Mg-SEPM)were prepared from the vast reserves of natural sepiolite at home by coprecipitation-suspension droplet method.The effects of various factors including the mass ratio of cellulose(MCC),sodium alginate(SA),La/Mg modified sepiolite(La/Mg-SEP)in the La/Mg-SEPM,La/Mg-SEPM dosage,pH of the water sample,ambient temperature,and adsorption time on the adsorption process of phosphorus were investigated,and the adsorption mechanism of phosphorus by La/Mg-SEPM from black-odorous water body was also analyzed based on the results of characterization.The results showed that La/Mg-SEPM exhibit the maximum phosphorus adsorption capacity of 21.03 mg/g when the mass ratio of MCC,SA,and La/Mg-SEP in La/Mg-SEPM was 2 ∶ 2 ∶ 1 as well as the dosage of La/Mg-SEPM was 1.0 g/L,which was around 11 times higher than that of natural sepiolite.Moreover,La/Mg-SEPM exhibited a good adsorption performance for phosphorus within the pH values range of 5～9 and ambient temperature of 5～25℃,and exhibited good settling property.After 4 cycles,the TP concentration in the water sample can still be reduced to below 0.2 mg/L by La/Mg-SEPM.The TP concentration in the actual mild and severe black-odorous water body after the treatment by La/Mg-SEPM was reached the limit of the surface water class Ⅲ water quality standard in Environmental Quality Standards for Surface Water(GB 3838-2002)for TP.In addition,the adsorption process of phosphorus was mainly controlled by chemical adsorption and monolayer adsorption,and ligand exchange and surface precipitation was a primary mechanism for phosphorus adsorption on La/Mg-SEPM.
La/Mg modified sepiolitegel microsphereblack-odorous water bodyTPadsorption
万方数据
维普
