Combined clinoptilolite and Fe(O)OH for efficient removal of Cu(II) and Pb(II) with enhanced solid–liquid separation

Discover Chemical Engineering, Год журнала: 2025, Номер 5(1)

Опубликована: Фев. 25, 2025

Abstract This study investigated combining fine clinoptilolite with iron hydroxide coagulant, as a cost-effective, dual-purpose flocculant for enhanced removal of Pb 2 ⁺ or Cu ions, along the solid–liquid separation and physicochemical analysis. For clinoptilolite, adsorption kinetics fitted pseudo-second-order (PSO) rate model higher constants 2+ , while equilibrium data Langmuir monolayer model, Q max similar at 18.8 mg/g 18.3 . TEM elemental mapping evidenced areas K Fe impurities, SEM suggested uniform distribution aggregates comprising core decorated FeOOH. X-ray diffraction (XRD) indicated FeOOH phase α-FeOOH (Goethite) no change in structure on inclusion adsorbed Combined clinoptilolite-FeOOH flocs were significantly larger than only precipitates, formed from 0.5 wt% 1 produced fastest settling rates greatest consolidation. Compressive yield stress also correlated dewatering combined systems, due to dense acting weighter material. final metals removal, outperformed across broad concentration range, achieving > 98% both ⁺. The greater denser floc production improved features highlights performance above that possible either ion exchange precipitation alone. Graphical abstract

Язык: Английский

Impact of fulvic acids on lead adsorption and transport behavior in cationic surfactant modified bentonite-loess liners

Environmental Geochemistry and Health, Год журнала: 2025, Номер 47(6)

Опубликована: Май 26, 2025

Язык: Английский