metal removal

layered double

cd ii

adsorption capacity

hg ii

pb ii

lead ions

Separation and Purification Technology

• A guanidine functionalized SBA-15/Fe 3 O 4 was fabricated as an efficient adsorbent. • Amine-modification of the Fe 3 O 4 @SBA-15was performed by using with APTES. • The Fe 3 O 4 @SBA-15-NH 2 was guanidinylated via a nucleophilic addition reaction. • A high adsorption capacity (370 and 333 mg/g) of Cu 2+ and Pb 2+ from water was observed. • Pseudo second-order kinetic and Freundlich isotherm well described the adsorption data. A mesoporous guanidine functionalized Santa Barbara Amorphous-15 (SBA-15)/Fe 3 O 4 magnetic nanoadsorbent (Fe 3 O 4 @SBA-15-Gd) was prepared for decontamination of aqueous solutions from Pb(II) and Cu(II) heavy metals. The multistep fabrication route, including hydrothermal SBA-15 synthesis process, in situ magnetization by Fe 3 O 4 magnetic nanoparticles (MNPs) (Fe 3 O 4 @SBA-15), post-synthetic method for composites’ modification by 3-aminopropyltriethoxysilane (APTES) (Fe 3 O 4 @SBA-15-NH 2 ), and nucleophilic addition to cyanimide to prepare the magnetic Fe 3 O 4 @SBA-15-Gd nanoadsorbent was conducted. Moreover, the mesoporous SBA-15 was utilized to support Fe 3 O 4 to diminish the MNPs agglomeration, and the guanidine functional group played a significant role in heavy metal adsorption. Various analyzing approaches were applied to validate the precise structure procedure. The novel adsorbent structure owes to the formation of bidentate chelating agent, guanidine groups, on the mesoporous SBA-15 support through a facile nucleophilic addition. An enhanced adsorption capability was acquired in this study. Hence, the Cu(II) and Pb(II) maximum adsorption capacity in optimized conditions reached ca. 344.82 mg/g and 303.03 mg/g. The obtained spherical-shaped MNPs in Fe 3 O 4 @SBA-15-Gd magnetic mesoporous nanoadsorbent presented average particles size ascertained to be ca. 63 nm. The Fe 3 O 4 @SBA-15-Gd nanoadsorbent rendered high porosity, high surface area, and abundant adsorption sites fabricated by cost-effective and accessible substance materials. Furthermore, the Freundlich model has ...

Efficient removal of Pb(II)/Cu(II) from aqueous samples by a guanidine-functionalized SBA-15/Fe3O4