Citation: XIE Fazhi, WANG Xuechun, YANG Peipei, LI Haibin, SHENG Dandan, HU Tingting, XIE Zhiyong. Pure Ca-Al- Layered Double Hydroxides as an Efficient Sorbent for Phosphate[J]. Chinese Journal of Applied Chemistry, ;2016, 33(4): 473-480. doi: 10.11944/j.issn.1000-0518.2016.04.150265 shu

Pure Ca-Al- Layered Double Hydroxides as an Efficient Sorbent for Phosphate

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School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China

Corresponding author: XIE Fazhi,
Received Date: 24 July 2015
Available Online: 18 November 2015
Fund Project:

High purity Ca-Al-layered double hydroxides(LDH) was prepared in an ethanol/water solution at a volume ratio of 4:1. Effect of sorbent dosage, adsorption time, pH value, inorganic electrolyte(Na₂CO₃, KCl, Na₂SO₄, KNO₃), temperature for phosphate adsorption were investigated. As prepared Ca-Al-LDH is an effective sorbent for phosphate adsorption. The maximum adsorption capacity of phospahte is 160.78 mg/g and the phosphate removal efficiency reaches to 95.88% at pH 5.1, temperature 318 K, time 600 min, solid/liquor ratio of 0.15 g/250 mL and initial phosphate concentration of 80 mg/L. Inorganic anions can restrain the adsorption of phosphorus on Ca-Al-LDH absorbent. Sorption capacity of phosphate is decreased 23.99% from 69.96 mg/g to 53.18 mg/g with increasing the concentration of Cl^- from 2.5 g/L to 25 g/L. The sorption capacity is reduced about 24.79% with SO₄^2- at the same conditions. Other inorganic anion also has a certain influence on phosphate sorption in pure Ca-Al-LDH. The second order kinetic equation is suitable for describing the adsorption process, and the Langmuir isotherm model fits the data well. The sorption mechanism is electrostatic attraction, chemosorption and anion intercalation.
- liquid phase coprecipitation,
- layered double hydroxides,
- phosphate adsorption,
- thermodynamics and kinetics equation
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