Study On The Performance Of Efficient Removal Of Trace Phosphate And Fluoride Ions By Lanthanum Based On Biological Material

The large surface area of porous materials, and has the special pore structure, so it is widely used in many fields, such as medicine, biological, chemical,environmental protection and functional materials. Especially in recent years, the research of porous materials has become a research hotspot of international, so for the characterization of synthesis and structure of it will become the focus of future research.After observation and analysis, Artemia Cyst-shell specific surface area, pore structure is relatively orderly and as a biological material, its itself has no pollution,environmental friendly. Therefore, if it can be used as a carrier, carrying inorganic nano powder to the successful adsorption of phosphate and fluoride ions in water, will make it have a good application prospects in environmental protection.Herein, we fabricated a new biological nanocomposite by loading nanosized lanthanum oxide onto the natural Artemia Cyst-shell(denoted as ACS-La), the adsorption performances toward phosphate and fluoride ions in waters were further investigated.Phosphorus sequestration onto ACS-La is a solution pH-dependent process with the optimal pHs-4.0-8.0. The resultant biomaterials can exhibit efficient phosphate removal performances against the present common competing anions at high concentrations.Kinetic test suggests that the rapid phosphate uptake can be approached within 100 minutes, which can be well described by the conventional pseudo-seconded kinetic and intraparticle diffusion models, it can be related to the unique layered pore channels within the host Artemia Cyst-shell. Besides, the maximum phosphate uptake capacity is approximately 180mg/g,which can be compared with the adsorbent elsewhere for phosphate removal in the literature. Column tests further display that the obtained ACS-La can achieve efficient phosphate removal with the effluent of below 0.5mg/L in 2000 BV treated capacities.Furthermore, the efficient fluoride removal can also be attached onto ACS-La, which can be used for the drinking water purification. As compared to its matrix Artemia Cyst-shell, ACS-La can achieve highly selective adsorption for fluoride retention inpresence of the high level competitive ions such as SO42-, NO3- and Cl- in water. More importantly, the fixed-bed column tests suggest that the resultant ACS-La exhibits a high defluoridation performance for application with the available treated volume of 2000 BV,and the exhausted materials can be efficiently regenerated and repeated use with alkaline solutions.In conclusion, the obtained ACS-La is an efficient adsorbent with multi-functio nalization, it can greatly promote both trace phosphate and fluoride ion sequestratio n in waters, which is a promising adsorbent in environmental remediation realm.