Fig. 6: Modeling studies on heavy metals sorption of isotherm, kinetics and regeneration of adsorbent. | npj Clean Water

Fig. 6: Modeling studies on heavy metals sorption of isotherm, kinetics and regeneration of adsorbent.

From: Heavy metal and organic dye removal via a hybrid porous hexagonal boron nitride-based magnetic aerogel

Fig. 6: Modeling studies on heavy metals sorption of isotherm, kinetics and regeneration of adsorbent.

Aerogel-mediated removal of Cr(VI) and As(V). Kinetic adsorption curves of the PEI-h-BNNSs-loaded PVA aerogels, Fe3O4 NPs-loaded PVA aerogels, and MHAs for (a) Cr(VI) and (b) As(V). Modeling of adsorption curves with the pseudo-first-order kinetics (a: dark yellow curve; b: dark blue curve) and pseudo-second-order kinetic (a: dark green curve; b: red curve). Adsorption isotherms of the PEI-h-BNNSs-loaded PVA aerogels, Fe3O4 NPs-loaded PVA aerogels, and MHAs for (c) Cr(VI) and (d) As(V). Adsorption isotherms modeling Fitting with the Freundlich model (c: dark green curve; d: red curve) and Langmuir model (c: dark orange curve; d: fluorescent green curve). e The qmax values of Cr(VI) and As(V) on the surface of adsorbents are (i) PEI-h-BNNSs-loaded PVA aerogels, (ii) Fe3O4 NPs-loaded PVA aerogels and (iii) MHAs. f The recovery of Cr(VI) and As(V) obtained from the elution of Cr(V) and As(V)-desorbed from MHAs with 0.1 M of KOH, NaOH, and NH4OH. g The reusability of MHAs for capturing and liberating of Cr(VI) or As(V). a–g The aerogels (2.0 g) were incubated with 10−600 mg mL−1 of Cr(VI) or As(V) at pH 7.0 and 298 K for (a, b, c–g) 0−15 min.

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