Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (12): 1413-1421.DOI: 10.11944/j.issn.1000-0518.2019.12.190077

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Influencing Factors of Lanthanum Adsorption by Ca-Montmorillonite and Its Application

ZHOU Fengzhen,LI Wenqiu,WANG Wenjing,GUO Huiling   

  1. Hubei University of Technology, School of Bioengineering and Food,Wuhan 430068,China
  • Received:2019-03-22 Accepted:2019-07-03 Online:2019-12-01 Published:2019-12-10
  • Contact: GUO Huiling
  • Supported by:
    Supported by the National Natural Science Foundation of China (No. 21401051) and the Natural Science Foundation of Hubei Province (No. 2014CFB595)

Abstract:

The adsorption of lanthanum on Ca-montmorillonite was studied. The crystal structure, surface morphology, specific surface area and chemical structure of Ca-montmorillonite were characterized by XRD, SEM, BET, Fourier transform infrared spectrum (FT-IR) and X-Ray fluorescence (XRF). The effects of initial lanthanum concentration, pH and adsorption temperature on the adsorption of La onto Ca-montmorillonite were examined when the mass concentration of Ca-montmorillonite was 10 g/L. The phosphorus removal effect of Ca-MMT@La was studied. The results showed that the adsorption of La onto Ca-montmorillonite increases with initial lanthanum concentration increasing, and the maximum adsorption capacity is 49.62 mg/g. With the increase of the pH of lanthanum-containing solution, the adsorption capacity increases and the optimum adsorption is obtained at initial pH 6 with the adsorption capacity of 38.36 mg/g. With the increase of temperature, the adsorption capacity increases firstly and then decreases. The maximum adsorption capacity of lanthanum is 41.23 mg/g at 20 ℃. The adsorption equilibrium was best described by the Langmuir isotherm model. The result indicated that La is adsorbed onto Ca-montmorillonite through the monolayer adsorption. Ca-montmorillonite can not adsorb phosphorus. However, Ca-MMT@La has a strong adsorption capacity for phosphate with the adsorption capacity of 7.24 mg/g and the phosphorus removal rate of 72.41%. The adsorption of phosphorus onto Ca-MMT@La increases with the increase of loaded lanthanum content.

Key words: Ca-montmorillonite, adsorbent, lanthanum, wastewater treatment, adsorption effect