Convenient Cr(VI) Removal from Aqueous Samples: Executed by a Promising Clay‐Based Catalytic System, Magnetized by Fe <sub>3</sub> O <sub>4</sub> Nanoparticles and Functionalized with Humic Acid
Zoleikha Hajizadeh, Kobra Valadi, Reza Taheri‐Ledari, Ali Maleki
Abstract
Abstract Here, a nanoscale efficient adsorbent for chromium(VI) ion is presented, which is constructed of halloysite nanotubes (HNTs) as a natural basis. On the other hand, to add magnetic property, iron oxide (Fe 3 O 4 ) nanoparticles have been incorporated inside and leaded onto the surface of HNTs. As the main component of nanoabsorbent, humic acid (HA) is also loaded onto the surface of HNT/Fe 3 O 4 nanocomposite. Cr(VI) removal process has been carefully monitored in the presence of the fabricated HNT/Fe 3 O 4 ‐HA nanoabsorbent from aqueous solutions with different concentrations of K 2 CrO 4 . The adsorption isotherms are interpreted by Langmuir graphs, and 98% removal efficiency (RE) has been obtained at room temperature, in 15 min contact time. Additionally, all the analyses related to the structure of desired product have been done, and the recyclability of produced nanoabsorbent is precisely investigated, as well.