活化赤泥颗粒吸附除磷的效能与机制研究

Research on Performance and Mechanisms of Activated Red Mud Particles on Adsorbing and Removing Phosphorus

以赤泥为主要原料,进行活化处理后,以粉煤灰为激发剂,膨润土(皂土)为黏结剂,碳酸氢钠为发泡剂制成不同配比的9种活化赤泥颗粒。将9种新型的活化赤泥颗粒吸附材料通过L9(34)正交试验进行对比,比较其对水体中磷的去除效果。结果表明,以吸附8 h后磷的吸附量为评价标准,在磷初始浓度为6.0 mg/L,p H为8.0时,配方8的赤泥颗粒对磷的吸附量为1.0 mg/g,对磷的去除率约为83.7%;而配方3的赤泥颗粒对磷的吸附量仅为0.1 mg/g,对磷的去除率约为7.2%。通过红外光谱法和XRD(X-衍射)对2种焙烧赤泥颗粒吸附材料的理化特性进行了表征和比较,发现焙烧后赤泥颗粒表面产生带有—OH官能团,可与磷酸根在溶液中发生配体交换反应而实现吸附。赤泥比例是影响吸附效果的关键因素。

Nine kinds of activated red mud particles with different mass ratios were formed,with the red mud as main raw material,fly ash as the excitation agent,bentonite as binder and sodium bicarbonate as foaming agent.The capacity of phosphorus adsorption in solution was compared through L9（ 34） orthogonal test with nine new types of activated red mud particle materials. Using the phosphorus adsorption rate after 8 hours of adsorption time as the evaluation standards,with the initial concentration of phosphorus 6. 0 mg / L and p H 8. 0,the adsorption capacity of phosphorus of No. 8 red mud particles was 1. 0 mg / g with the phosphorus removal rate of about 83. 7%,while the adsorption capacity of phosphorus of No. 3 red mud particles was merely 0. 1 mg / g with the phosphorus removal rate of about 7. 2%. From characterization and comparison by infrared spectroscopy and XRD（ X-diffraction） on the physicochemical properties of two calcined red mud particles adsorbed materials,it was shown that the calcined red mud particles surface had（ —OH） substance functional group which could exchange ligand with phosphate in the solution and thus achieved adsorption. The red mud content is a key factor affecting the adsorption effect.