Synthesis And Lead Ion Adsorption Properties Of Nano-metal Oxide And Superabsorbent Hydrogel Composite

In this paper, metal oxide manganese dioxide nanowires and biomorphic aluminium oxide as filter paper temples were added into the acrylic acid, acrylic amide, and 2-acrylamide-2-methyl propane sulfonic acid as the monomers to synthetize superabsorbent hydrogel composites, respectively. With different morphology of nano-oxide materials and conducted a series of characterization of hydrogel composite materials, as the same to the adsorption performance of composites on Pb2+.The superabsorbent composite was synthesized by aqueous solution polymerization, using manganese dioxide nanowires by hydrothermal method, acrylic acid, acrylic amide, 2-acrylamide-2-methyl propane sulfonic acid as raw materials, N,N’-methylene bisacrylamide and K2S2O8 as cross-linking agent and initiating agent, respectively. The effects of the neutralization degree, amount of manganese dioxide nanowires, cross –linking agent, and initiating agent on Pb2+ absorbency were researched. Moreover, the adsorption performances on Pb2+ of composite were investigated by kinetic and thermodynamics. The results displayed that the kinetic studies for adsorption on Pb2+ was in consistent with pseudo-second-order, adsorption isotherm data were reliably showed by the Freundlich model. Meanwhile, the samples were characterized by scanning electron microscopy analysis and thermogravimetric analysis. As can be seen, the manganese dioxide nanowires were inserted into the network structure and the load of manganese dioxide nanowires increased the thermal stability of hydrogel composite.Biomorphic aluminium oxide on filter paper temples and Al(NO3)3·9H2O as raw material was fabricated by infiltration and subsequently calcination. The hydrogel composite was synthesized by aqueous solution polymerization and the orthogonal test was employed to evaluate the optimal reaction condition in the adsorption of superabsorbent hydrogel and biomorphic Al2O3 composite on Pb(II). The optimal case was that the neutralization degree was 70%, and the most optimal amount of agents of cross-linking agent, initiating agent and Al2O3 were 0.08 wt.%, 0.5 wt.% and 2 wt.% respectively. The adsorption properties of hydrogel composite were researched and the hydrogel was represented by scanning electron microscopy analysis and thermogravimetric analysis. Adsorption kinetics data for Pb2+ adsorption better coincided to the pseudo-second-order model, the Freundlich model offered the best related for the experimental data. Moreover, the thermostability of hydrogel composite has improved.