New Insight into the Mechanism for the Removal of Methylene Blue by Hydrotalcite-Supported Nanoscale Zero-Valent Iron

Nanoscale zero-valent iron (nZVI) has become a new and ecofriendly adsorbent material with promising applications. Herein, hydrotalcite-supported nanoscale (nZVI@H) is synthesized for the first time used testing removal of methylene blue (MB) in an aqueous solution. The successful fabrication nZVI@H characterized by SEM, BET, XRD, FTIR zeta-potential analyses. results showed that 99.6% MB removed using after 30 min reaction at initial concentration 40 mg·L−1, while bare nZVI only 71.2%. kinetic analysis yielded process consistent Langmuir model quasi-second-order model. According to model, maximum adsorption on 81 mg·g−1. This study provides idea about mechanism removal, namely, converted colorless LMB through Fe0 redox simultaneously attached surface process, finally via complexation precipitation.