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TiO2 or ZnO Nanoparticles Assembled into Zn/Al-Layered Double Hydroxides for Removal of Phosphate Species from Water
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DOI：10.3390/w18161979.png)
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Abstract
En 中文
Phosphorus is recognized as one of the primary contributors to eutrophication in freshwater ecosystems. Among the various strategies proposed to mitigate its impact, adsorption-based removal has emerged as one of the most widely adopted and effective approaches globally. In this study, Zn/Al-layered double hydroxides (LDHs) were synthesized by varying the molar ratio of cations to obtain materials with different cationic densities. The materials were additionally modified via a co-precipitation method to incorporate titanium dioxide (TiO2) or zinc oxide (ZnO) nanoparticles to synthesize novel composite nanomaterials aimed at phosphate species removal from aqueous solutions. The resulting materials demonstrated orthophosphate adsorption capacities exceeding 45 mg/g in most cases. Adsorption kinetics were evaluated using pseudo-first order and pseudo-second order models, while equilibrium data were fit to the Langmuir and Freundlich isotherms. The results indicated that the pseudo-second order model and the Langmuir isotherm provided the best fit, suggesting that the adsorption process is predominantly chemisorption occurring on a homogeneous monolayer. These findings highlight the potential of TiO2/ZnO–LDH composites as efficient adsorbents for phosphorus remediation in aquatic environments.
Keywords:
ZnAl-layered double hydroxides
nanoparticles
crystal structure
adsorption capacity
wastewater treatment
Journal
W
IF:
3
Papers:
3.1W
Citations:
7.4W
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