Adsorption of Pb(Ⅱ) in Water by Niobate/Titanate Nanoflakes

作者：丁庆伟; 隋睿; LIU Xiaona; 钱天伟^*

来源：Journal of Wuhan University of Technology-Materials Science Edition, 2020, 35(04): 726-732.

A niobate/titanat nanoflakes (Nb/TiNFs) composite was synthesized via the hydrothermal method and used to remove Pb(Ⅱ) from water.XRD,TEM,and SEM results indicate that Nb/TiNFs appear as nanoflakes,of which the primary crystal phase is tri-titanate.Nb/TiNFs show rapid adsorption kinetics and the result fits well with the pseudo-second order model.The key mechanism of adsorption is ion-exchange between metal and-ONa/H.According to the Langmuir isotherm model,the maximum capacity of Pb(Ⅱ) is 488.323 mg·g-1.The relatively low RL values indicate that Nb/TiNFs exhibit favorable adsorption of Pb(Ⅱ).Nb/TiNFs indicate high adsorption capacity over a broad pH range.Co-existing inorganic ions (Na+ and Ca2+) have a slight inhibition effect on adsorption,and HA moderately inhibits the adsorption of Pb(Ⅱ) on Nb/TiNFs.Because of the simple method of synthesis and high removal efficiency for heavy metals,Nb/TiNFs are a promising material in remediation of heavy metal polluted water.

• 单位
  太原理工大学