硅藻土基复合除磷剂的制备及其吸附性能  

Preparation and Adsorption Performance of Diatomite-Based Composite Phosphorus Removal Agent

作　　者：高耀文[1] 段宁[1] 吴克明[1] 沈丽娟[1] 

机构地区：[1]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《生态与农村环境学报》2012年第6期706-711,共6页Journal of Ecology and Rural Environment

基　　金：湖北省教育厅重点项目(D20101107)

摘　　要：以硅藻土为原料,通过引入钢渣复合的方法制备硅藻土基复合除磷剂,采用傅里叶变换红外光谱(FTIR)、X-射线衍射(XRD)和扫描电镜(SEM)对复合除磷剂进行表征,并研究投加浓度、吸附时间、pH值和温度对复合除磷剂吸附效果的影响。结果表明,与钢渣复合后,复合除磷剂中部分基团可能发生变化,晶体结构可能发生改变,出现新的晶相。静态除磷试验表明复合除磷剂的最佳反应条件:投加质量浓度2 g.L-1,吸附时间1 h,水样pH值为5,温度25℃。硅藻土基复合除磷剂对磷的吸附动力学行为符合准二级动力学模型;Freundlich、Langmuir和Redlich-Peterson吸附等温方程均能较好地描述复合除磷剂对磷的等温吸附特征。硅藻土基复合除磷剂对磷的理论饱和吸附量为1 428 mg.kg-1,是一种潜在的高效环保型吸附材料。Diatomite was used as raw material and prepared into a diatomite-based composite phosphorus removal agent by combining it with some combining steel slag. The agent was characterized with Fourier transform infrared spectroscopy （FTIR）, X-ray diffraction （XRD） and scanning electron micrograph （SEM）. Besides, effects of dosage of the agent used, duration of the adsorption, pH value and temperature on performance of the agent were investigated by batch sorp- tion experiments. Results show that combination with steel slag has brought about some changes in some parssads and in crystalline structure, creating new crystal phases. Static P-removing experiments demonstrate that the agent performed the best when the agent was applied at a rate of 2 g · L^-1 , into the wastewater, 5 in pH and 25 ℃ in temperature, for 1 h in- cubation. Evaluation of the experimental data in terms of adsorption kinetics reveals that the P adsorption kinetic behavior of the agent well fitted the pseudo-second-order kinetic model. Meanwhile, isothermal equations, such as Freundlich, Langmuir and Redlich-Peterson isotherms can be used to well describe the adsorption performance of the agent. The theo- retical P saturation adsorption capacity of the agent is 1 428 mg · kg^- 1, which indicates that the diatomite-based composite phosphorus removal agent can be used as a potentially efficient and environmental friendly absorbent material.

关 键 词：复合除磷剂 硅藻土 钢渣 动力学 吸附等温线 

分 类 号：X703[环境科学与工程—环境工程]