Adsorption removal of Pb2+ and Cd2+ on lignocellulose-g-acrylic acid/montmorillonite nanocomposite from aqueous solutions

Lignocellulose-g-acrylic acid/montmorillonite nanocomposite materials (LNC-g-AA/MMT) was used as an adsorbent to remove Pb2+, Cd2+ ions from the aqueous solutions(.) The effects of various experimental conditions including initial metal ions concentration, initial solution pH, contact time, and temperature were investigated. The data showed that 0.1g of LNC-g-AA/MMT, 0.04mol/L of Pb2+, and 0.05mol/L of Cd2+, pH 5.5, contact time of 120 and 60min at 30 degrees C, a maximum adsorption capacity of Pb2+(918.2mg/g) and Cd2+(482.5mg/g) were observed. The adsorption kinetics and isotherms have been studied, which implied that all absorption processes were in good agreement with the pseudo-second-order model and the Langmuir isotherm, respectively. The desorption process was also studied. The results indicated that the desorption capacity of LNC-g-AA/MMT for Pb2+ and Cd2+ was 821.9 and 448.2mg/g with 0.1g metal ions-loaded adsorption, 0.06 and 0.04mol/L of HNO3 concentration, contact time 60min, contact temperature 30 degrees C, in which the maximum desorption percentage was 90 and 92.9%, respectively.