钾长石负载羟基磷灰石对水中Ni^(2+)的吸附性能

Adsorption of K-feldspar Loaded Hydroxyapatite for Ni^(2+) in Aqueous Solution

以钾长石为原料,采用液相合成法制备羟基磷灰石/钾长石复合吸附材料(HAK),利用XRD、SEM、BET对其进行表征,考察添加量、初始pH、吸附时间、初始浓度和温度对HAK吸附Ni^(2+)的影响。结果表明:钾长石上负载了羟基磷灰石,其表面变得疏松粗糙,比表面积和总孔体积明显增大; HAK添加量、初始pH、温度的提高均有利于HAK对Ni^(2+)的吸附;该吸附过程在180 min达到吸附平衡并符合准二级动力学模型; Langmuir等温模型更适合描述该吸附行为,在25℃下HAK的饱和吸附量可达17. 63 mg/g附能力比原料提高近5倍。

K-feldspar was chosen as material to produce hydroxyapatite/K-feldspar composite absorbing materials(HAK)via liquid phase synthesis,which were characterized by XRD,SEM,BET.The effects of HAK on Ni^2+adsorption were researched,including HAK addition,initial pH,adsorption time,initial concentration and temperature.The result showed that the surface of K-feldspar became loosen and rough with a larger superficial area and total pore volume apparently after loaded on hydroxyapatite.The increasing of HAK addition,initial pH and temperature were advantageous to the adsorption of Ni^2+by HAK.This adsorption process reached adsorption equilibrium in 180 mins and fitted the pseudo-second-order kinetic model.Langmuir Isothermal model was more suitable for describing this adsorption behavior and the saturated adsorption capacity of HAK was 17.63 mg/g at 25℃,which was 5 times approximately than the raw material.