. 2022 Mar 4;10:814643. doi: 10.3389/fchem.2022.814643

TABLE 2.

Heavy metal ions adsorbed by polyamide amine/magnetic nanomaterial composites.

Adsorbents	Metal ions	Q _e (mg/g)	Conditions	Model (adsorption isotherm; kinetics)	References
Fe₃O₄@SiO₂-M2	Hg²⁺	160.47	308.15K; pH 6.0; C₀ = 0.005 mol/L	Langmuir isotherm model	Luan et al. (2021a)
Fe₃O₄@SiO₂-M2	Ag⁺	139.15	308.15K; pH 6.0; C₀ = 0.005 mol/L	Pseudo-second-order	Luan et al. (2021a)
MNPs-G2-Mu	Pb²⁺	232.56	298K; pH 5.0; C₀ = 200 mg/L	Langmuir isotherm model	Ekinci et al. (2021)
MNPs-G2-Mu	Pb²⁺	232.56	298K; pH 5.0; C₀ = 200 mg/L	Pseudo-second-order	Ekinci et al. (2021)
Fe₃O₄@PDA@PAMAM	Cu²⁺	97.18	298K; pH 7.0; C₀ = 80 mg/L	Langmuir isotherm model	Sun et al. (2018)
Fe₃O₄@PDA@PAMAM	Cu²⁺	97.18	298K; pH 7.0; C₀ = 80 mg/L	Pseudo-second-order	Sun et al. (2018)
Fe₃O₄@DA@PAMAM	Cu²⁺	209.7	298K; pH 7.0; C₀ = 80 mg/L	-	Wang et al. (2020)
	Pb²⁺	262.1
	Cd²⁺	150.2
CT-HPMNPs	Hg²⁺	72.3	298K; pH 5.0; C₀ = 20 mg/L	Freundlich isotherm model	Tabatabaiee Bafrooee et al. (2020)
CT-HPMNPs	Hg²⁺	72.3	298K; pH 5.0; C₀ = 20 mg/L	Pseudo-second-order	Tabatabaiee Bafrooee et al. (2020)
PAMAMG3-Fe₃O₄/P (GMA‑AA‑MMA)	U⁶⁺	395.2	298K; pH 4.5; C₀ = 150 mg/L	Langmuir isotherm model	Yuan et al. (2016)
PAMAMG3-Fe₃O₄/P (GMA‑AA‑MMA)	U⁶⁺	395.2	298K; pH 4.5; C₀ = 150 mg/L	Pseudo-second-order	Yuan et al. (2016)
PAMAM-MNC	Pb²⁺	333	298K; pH 5–6; C₀ = 1,000 mg/L	Langmuir isotherm model	Pourjavadi et al. (2016)
PAMAM-MNC	Pb²⁺	333	298K; pH 5–6; C₀ = 1,000 mg/L	Pseudo-second-order	Pourjavadi et al. (2016)
Fe₃O₄@SiO₂-G2.0-S	Hg²⁺	605.78	308K; pH 6.0; C₀ = 0.01 mol/L	Langmuir isotherm model	Zhou et al. (2020)
Fe₃O₄@SiO₂-G2.0-S	Hg²⁺	605.78	308K; pH 6.0; C₀ = 0.01 mol/L	Pseudo-second-order	Zhou et al. (2020)