硅藻土负载镧对水体中磷酸根的吸附研究
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摘要
经超声混合、干燥和煅烧,在硅藻土上负载镧(D-La)。采用XRD、SEM和N_2吸脱附曲线表征其结构和形貌,通过系列吸附实验研究其对磷的吸附特性。表征结果表明,含镧化合物为碳酸氧镧(La_2O_2CO_3),均匀地负载在硅藻土表面。吸附结果表明,D-La能对磷酸根快速吸附,2 h内基本达到吸附平衡,吸附动力曲线符合拟二级动力学模型,Langmuir模型能更好地拟合D-La对磷的吸附,D-La对磷的最大吸附量为80.90 mg/g。
Lanthanum has been successfully loaded on diatomite by getting through supersonic mixing,drying and calcination processes. Its structure and shape have been characterized by means of XRD,SEM and N_2 adsorptiondesorption curve, and the adsorption characteristics for phosphate investigated through systematical adsorption experiments. The characterization results indicate that the lanthanum-containing compound is lanthanum oxygen carbonate, which is loaded evenly on the surface of diatomite. The adsorption results show that the phosphate radicals can be adsorbed by D-La quickly,and reach adsorption equilibrium within 2 h,the adsorption kinetic curve conforms to pseudo second-order kinetic model, and Langmuir model can fit adsorption isotherm of D-La for phosphorus better,and the maximum adsorption capacity of D-La for phosphorus is 80.90 mg/g.
Lanthanum has been successfully loaded on diatomite by getting through supersonic mixing,drying and calcination processes. Its structure and shape have been characterized by means of XRD,SEM and N_2 adsorptiondesorption curve, and the adsorption characteristics for phosphate investigated through systematical adsorption experiments. The characterization results indicate that the lanthanum-containing compound is lanthanum oxygen carbonate, which is loaded evenly on the surface of diatomite. The adsorption results show that the phosphate radicals can be adsorbed by D-La quickly,and reach adsorption equilibrium within 2 h,the adsorption kinetic curve conforms to pseudo second-order kinetic model, and Langmuir model can fit adsorption isotherm of D-La for phosphorus better,and the maximum adsorption capacity of D-La for phosphorus is 80.90 mg/g.
引文
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[3]金洋,王春贺,黄帮蕊,等.硅藻土的特点及其应用进展[J].硅酸盐通报,2016,35(3):810-814.
[4] Yao H,Peng J,Yu Q,et al. Preparation and phosphorous removal performance of FeOOH coated diatomite[J]. Inorganic Chemicals Industry,2011,43(5):24-27.
[5] Liu N,Wu Z,Li M,et al. Low-temperature preparation of a mesoporous silica superbase by employing the multifunctionality of a La2O3interlayer[J]. Chemcatchem,2017,9(9):1641-1647.
[6] Fang L,Shi Q,Nguyen J,et al. Removal mechanisms of phosphate by lanthanum hydroxide nanorods:Investigations using EXAFS,ATRFTIR,DFT and surface complexation modeling approaches[J]. Environmental Science&Technology,2017,92(1):135-149.