Preparation of MgAl-CO₃-LDHs for VO₃^- Adsorption

Abstract

In the study, MgAl binary water talc (MgAl-CO₃-LDHs) was firstly synthesized by a steady-state co-precipitation method and then characterized by XRD, SEM and ICP-OES methods. The effects of n(Mg²⁺)/n(Al³⁺) in mixed salt solutions, pH and roasting temperature on the properties of MgAl-CO₃-LDHs were mainly explored. The optimal adsorption condition of VO₃^- on MgAl-CO₃-LDHs was determined as synthesis temperature of 25 °C, n(Mg²⁺)/n(Al³⁺) ratio of 3:1, pH 8 ± 0.1 and roasting temperature of 517 °C. The adsorption characteristics of MgAl-CO₃-LDHs on VO₃^- were better fitted with Langmuir's isothermal equation and quasi-secondary kinetic equation. The adsorption mechanism was close to the monolayer adsorption with a saturated adsorption capacity of 53.73 mg/g.

Keywords:

• MgAl-CO3-LDHs
• VO3
• adsorption property

Additional information

Funding

This project was financially supported by the National Natural Scientific Foundation of China (41673109, 41977289), S&T Department of Sichuan Province (2017SZ0185, 2018SZDZX0022 and 2019ZDZX0025), Sichuan Vanadium &Titanium Industry Development Research Center (2018VTCY-Z-02), Sichuan University Panzhihua school city strategic cooperation special fund project(2019CDPZH-6), and Mount Everest scientific research project of Chengdu University of Technology (80000-2020ZF11405).