Constructing nanostructured silicates on diatomite for Pb(II) and Cd(II) removal
Source abstract
Abstract
Crystallizing nanostructured silicates on diatomite is an alternative way to prepare promising low-cost adsorbents for heavy metal removal. Here we report a facile hydrothermal process to build (Zn2SiO4 or Mn7O8(SiO4)) layer on diatomite with the assistance of ethanediamine which is essential for the construction of hierarchical silicate nanostructures via an energetically favored heterogeneous nucleation process. The prepared ZnDt (Zn2SiO4/diatomite) was selected as an example to study the absorption behaviors toward lead Pb(II) and cadmium Cd(II) ions. The results reveal that the adsorption capacities of ZnDt composite for Pb(II) and Cd(II) ions reach 443.0 mg/L and 29.0 mg/L, respectively. The adsorption kinetics and isotherm analysis show that the adsorption process is properly described by pseudo-second-order and Langmuir models. Process parameters (pH value, ion strength, adsorption time, etc.) effecting the adsorption capacity were optimized, and high adsorption capacity for Pb(II) in the presence of coexistent cations (Cd2+ and Na+) was observed in competitive adsorption process. Our structural analysis and Zn2+ extractability determinations show that surface layer of Zn2SiO4 nanosheets is hydrolyzed in Pb2+ and Cd2+ aqueous solution, resulting in the dominant chemisorption of Pb2+ and Cd2+ on external surface sites to generate Pb3(OH)2(CO3)2 and Cd(OH)2, respectively. The current work may inspire the development of new types of 3D nanostructured diatomite-based adsorbents for remediation of wastewater.
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Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Nanomaterials for catalytic reactions · Recycling and utilization of industrial and municipal waste in materials production
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