铁铝复合吸附剂去除水中痕量磷效能及机理  

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

作　　者：李星[1] 范茜[1] 杨艳玲[1] 

机构地区：[1]北京工业大学建筑工程学院北京市水质科学与水恢复工程重点实验室,北京100022

出　　处：《北京工业大学学报》2008年第3期310-313,共4页Journal of Beijing University of Technology

基　　金：国家自然科学基金(50378004);中国博士后科学基金(2005038040);北京市属市管高校人才强教计划资助项目(05004014200701);北京市自然基金(8082009).

摘　　要：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.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 effective phosphorus removal efficiency, which is clearly better than those of Fe2O3 and active aluminum oxide （γ-Al2O3） under the same condition. When initial ρ（PO4^3- -P） is 0.3 mg/L, the adsorption capacity is as high as about 1.5 times of Fe2O3 and 2.5 times of γ-Al2O3.The adsorbent is proved with property of hyperfine powder. The specific surface area reaches 184.45 m^2/g, which is 9.15 times as large as that of Fe2O3. One of the main reason of effective adsorption to phosphorus is that aluminum embedment and lattice disruption and micro-crystallization caused by grinding during preparation process. The zero potential is 6.2. Another main reasons of effective adsorption to phosphorus is no-specific and strong specific adsorption existed on adsorbent surface in water treatment process.

关 键 词：铁铝复合吸附剂 痕量磷 吸附 机理 

分 类 号：TU991.2[建筑科学—市政工程]