铁铝复合吸附剂去除水中痕量磷效能及机理

考察了铁铝复合吸附剂去除水中痕量磷的效能,并采用粒度分析、Zeta电位测定及能谱分析等手段对其吸附除磷机理进行探讨.结果表明,该吸附剂具有高效吸附除磷效能,明显优于同等条件下Fe_2O_3和活性氧化铝(γ-Al_2O_3),初始ρ(PO_4~(3-)-P)=0.3 mg/L时,其吸附容量比Fe_2O_3和γ-Al_2O_3分别提高了近1.5倍和2.5倍.该吸附剂具备超细粉体的特征,比表面积达184.45 m~2/g,是Fe_2O_3的9.15倍.Al元素的嵌入、制备过程中.研磨粉碎导致的晶格错位及微晶化是其对磷高效吸附的一个主要原因.其0电荷点为6.2,水处理过程中.在吸附剂表面同时存在非特性吸附和强特性吸附是其对磷高效吸附的另一个主要原因.

Efficiency and Mechanism of Trace Phosphorus Removal in Water by Iron-aluminum Composited Adsorbent

Removal of trace phosphorus in water is investigated by iron-aluminum composited adsorbent. Adsorption mechanism of phosphorus removal is approached by analysis methods such as particle size analysis, zeta potential and scanning electron microscopy.Results show that the absorbent is provided with more effec- tive phosphorus removal efficiency,which is clearly better than those of Fe_2O_3 and active aluminum oxide(γ- Al_2O_3)under the same condition.When initialρ(PO_4~(3-)-P)is 0.3 mg/L,the adsorption capacity is as high as about 1.5 times of Fe_2O3 and 2.5 times ofγ-Al_2O_3.The adsorbent is proved with property of hyperfine pow- der.The specific surface area reaches 184.45m~2/g,which is 9.15 times as large as that of Fe_2O_3.One of the main reason of effective adsorption to phosphorus is that aluminum embedment and lattice disruption and mi- cro-crystallization caused by grinding during preparation process.The zero potential is 6.2.Another main rea- sons of effective adsorption to phosphorus is no-specific and strong specific adsorption existed on adsorbent sur- face in water treatment process.