Stimuli-responsive adsorption behavior toward heavy metal ions based on comb polymer functionalized magnetic nanoparticles

Pb(II) removal in water via adsorption onto deep eutectic solvent fabricated activated carbon

“…At 50 °C, we reported a positive value of ∆G o , indicating a non-spontaneous process at this temperature. This result is in agreement with the ∆H (− 43.90 kJ/mol) confirming the exothermic natures of the adsorption process (Liu et al, 2020), which also supported by the changes in uptake capacity for Pb(II) removal. Equally, the ∆S o value was < 0 (− 138.95 J/Kmol) signifying a decrease in randomness (Liu et al, 2020) at the DES/ H 3 PO 4 -600 2:3/aqueous interphase in the course of the adsorption process.…”

Synthesis of FeO@SiO2–DNA core–shell engineered nanostructures for rapid adsorption of heavy metals in aqueous solutions

“…The differences are attributed to parameters such as the atomic radius (AR), the ratio of AR respect to atomic weight, and the electronegativity, promoting a high selectivity of the FeO@SiO 2 -DNA towards Pb(II) ions. 63 These results are following the Hard and So Acids and Bases (HSAB) theory, which establishes that Pb(II) and As(III) present an intermediate and so acid nature, respectively. 64 In the case of Hg(II), the acid nature is strong enough to lead weak polarization and low stability on the surface of FeO@SiO 2 -DNA.…”

Magnetic nanoadsorbents for micropollutant removal in real water treatment: a review

“…Some recent high-performance supermagnetic nanoadsorbents examined for scavenging heavy metals and/or organic micropollutants are Fe 3+ -stabilized magnetic polydopamine composite (Chen et al 2020 ), comb polymer-functionalized magnetic nanoparticles (Liu et al 2020a ), magnetic porous NiLa-layered double oxides (Vu and Wu 2020 ), magnetic β-cyclodextrin polymer (Hu et al 2020 ; Nkinahamira et al 2020 ), magnetic activated carbon-Fe 3 O 4 (D’Cruz et al 2020 ), cyanopropylsilane-functionalized TiO 2 magnetic nanoparticles (Mousavi et al 2019 ), magnetic graphene oxide modified by β-cyclodextrin (Wang et al 2020a ), hexadecyltrimethylammonium bromide-surface-functionalized magnetic UiO-66@UiO-67 composite adsorbent (Li et al 2020 ), magnetic core-shell MnFe 2 O 4 @TiO 2 nanoparticles loaded on reduced graphene oxide (Chang et al 2021 ), magnetic graphene oxide decorated with persimmon tannins (Gao et al 2019 ), magnetic montmorillonite nanocomposite (Fatimah et al 2021 ), magnetic Fe 3 O 4 nanocubes coated by SiO 2 and TiO 2 (Khalaf et al 2019 ), ferrihydrite-loaded magnetic sugar cane bagasse charcoal adsorbent (Xin et al 2021 ), ethylenediamine-functionalized magnetic graphene oxide for arsenic(III) removal from aqueous solutions (Tabatabaiee Bafrooee et al 2021 ), and last but not least MnFe 2 O 4 /multiwalled carbon nanotubes (Zhao et al 2021b ). The list of recent magnetic nanoadsorbents is very long indeed.…”