载镧磁化赤泥处理含磷废水的研究  

Study on treatment of phosphorus-containing wastewater by lanthanum-loaded magnetized red mud

作　　者：鲁镜镜 谢燕[1] 李宸 蒙梅 冯伦伟 LU Jingjing;XIE Yan;LI Chen;MENG Mei;FENG Lunwei(College of Chemistry and Chemical Engineering of Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025

出　　处：《无机盐工业》2023年第2期99-105,共7页Inorganic Chemicals Industry

基　　金：国家重点研发计划项目(No.2018YFC1903500)。

摘　　要：采用酒糟作为还原剂,对赤泥进行还原、磁化和焙烧,得到可磁回收的赤泥材料,然后用稀土金属镧对其进行改性得到载镧磁化赤泥,并用于水体除磷。利用X射线衍射仪、傅里叶变换红外光谱仪、振动样品磁强计和光电子能谱仪对改性前后样品进行表征,结果表明赤泥已被成功磁化和载镧,改性后赤泥磁性增加了3.85倍。在室温下,当吸附剂用量为4 g/L、磷酸盐初始质量浓度为50 mg/L时,载镧磁化赤泥对磷的平衡吸附容量达12.31 mg/g,是赤泥的6.62倍。研究结果表明,载镧磁化赤泥对水体中磷具有良好的选择性和可回收性,对磷的吸附过程遵循Langmuir等温吸附模型且属于准二阶动力学方程,是自发吸热熵增的过程。The spirit-based distillers′grains were used as reducing agents to reduce,magnetize and roast red mud to prepare magnetically recyclable red mud materials.And rare earth metal lanthanum was further used to prepare lanthanum-loaded magnetized red mud for phosphorus removal in water.The samples before and after modification were characterized by Xray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),Vibrating sample magnetometer(VSM),and X-ray photoelectron spectroscopy(XPS).The results showed that the red mud had been successfully magnetized and lanthanumloaded,and magnetic properties of the modified red mud was increased by 3.85 times.When the initial concentration of phosphate was 50 mg/L and the amount of adsorbent was 4 g/L,the equilibrium adsorption capacity was 12.31 mg/g after the treatment of the lanthanum-loaded magnetized red mud at room temperature,which was 6.62 times that of RM.The results indicated that the lanthanum-loaded magnetized red mud had good selectivity for phosphorus in water and was easy to recover.The adsorption process of phosphorus was in line with the Langmuir isotherm adsorption model and pseudo-second-order kinetic equation,which was a process of spontaneous endothermic entropy increase.

关 键 词：赤泥 除磷 磁化 镧 吸附 

分 类 号：O647.3[理学—物理化学]