Preparation and adsorption behaviors of ethylene diamine tetraacetic acid modified zwitterionic hybrid materials

摘要: Novel ethylene diamine tetraacetic acid (EDTA)-modified zwitterionic hybrid materials were prepared via a sol–gel process. Their adsorption performances for Pb2+ ions examined. Fourier transform infrared spectroscopy confirmed the reaction products. Thermogravimetric analysis revealed that thermal stability of these could reach 200°C. Differential scanning calorimetry measurement showed addition titanium butoxide impact crystallization transformation materials. Field emission electron microscopy images EDTA modification induced decrease in particle size. Adsorption experiments demonstrated optimal initial pH was 5. Moreover, we observed adsorptions followed Lagergren pseudo-second-order kinetic model, intraparticle diffusion, and Langmuir isotherm model. In addition, found maximal constant 0.86 mmol/g. The negative Gibbs free energy values suggested onto samples spontaneous nature. desorption experiment indicated be recovered with aqueous HCl solution as desorbent. These results suggest synthesized EDTA-modified are promising adsorbents used to separate recover heavy-metal from polluted wastewater. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39801.