Synthesis of a core–shell magnetic Fe₃O₄–NH₂@PmPD nanocomposite for efficient removal of Cr(vi) from aqueous media

Abstract

The magnetic Fe3O4–NH2@PmPD composites show outstanding Cr(vi) removal performance due to the abundant nitrogen-containing functional groups.

Biochar Derived from Sawdust Embedded with Molybdenum Disulfide for Highly Selective Removal of Pb2+

“…21 The R 2 , RSS, and χ 2 suggested the pseudo-second-order model described the kinetics adsorption well, and a chemisorption process (strong chemical forces) was the rate-limiting step for Pb 2+ removal. 21,49 To further describe the diffusion mechanism, the intraparticle diffusion model was utilized to simulate the adsorption data. Especially, the values of intercept (A) can reflect the extent of the boundary layer thickness (the large A values indicate a great boundary layer effect).…”

“…The adsorption percentage (%), adsorption capacity (C s , mg/g), and the distribution coefficient (K d ) were calculated from the following equations: 19,21 (1)…”

“…Nowadays, nanomaterials (such as Fe 3 O 4 , MgO, MnO 2 , SiO 2 , and MoS 2 ) have been applied as adsorbents for heavy metal ions removal due to their high activity. 5,12,21,22 Among them, the MoS 2 exhibits remarkable adsorption performance and has been known as a potential material for the separation or elimination of heavy metal ions from wastewater. 22−25 The mechanism responsible for Pb 2+ adsorption by MoS 2 is attributed to the abundant intrinsic sulfur atoms (potential binding sites) on the surface.…”

“…Nowadays, nanomaterials (such as Fe 3 O 4 , MgO, MnO 2 , SiO 2 , and MoS 2 ) have been applied as adsorbents for heavy metal ions removal due to their high activity. ,,, Among them, the MoS 2 exhibits remarkable adsorption performance and has been known as a potential material for the separation or elimination of heavy metal ions from wastewater. − The mechanism responsible for Pb 2+ adsorption by MoS 2 is attributed to the abundant intrinsic sulfur atoms (potential binding sites) on the surface. The sulfur atom is a soft base, which is greatly beneficial to complexation with the soft acid (Pb 2+ ) according to the theory of the Pearson Hard Soft Acid Base. , However, a considerable amount of sulfur atoms inside the layer-stacked MoS 2 could not bind Pb 2+ . , If large specific surface nanostructures can be obtained, most of the S atoms may be exposed and thus improve the adsorption ability to the highest extent.…”

V‐N‐C catalysts anchored to mesoporous Al‐SBA‐15 with tailorable pore sizes for the synthesis of spirooxindole dihydroquinazolinones derivatives

“…Meanwhile, two peaks with binding energy at 400.7 eV could be observed in N 1s spectra of the V‐N‐C @Al‐SBA‐15 sample (Figure c). This peak shows binding energy for the amide group (CO–NH‐C) …”