Synthesis of Hierarchical Porous Nickel Phyllosilicate Microspheres as Efficient Adsorbents for Removal of Basic Fuchsin
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Abstract
Nickel phyllosilicates have shown considerable potential in many fields such as electrochemistry and catalysis owing to their specific structures, attracting a great attention on preparation and properties of them in recent years. In this study, Ni 3 Si 2 O 5 (OH) 4 microspheres were synthesized via a hydrothermal method by using NiCl 2 and tetraethyl orthosilicate (TEOS) as the raw materials. Effects of Ni/Si molar ratio and alkali source on the phase composition, morphology and textural property of the products were investigated. Under optimized conditions, the as-synthesized Ni 3 Si 2 O 5 (OH) 4 microspheres presented a nanosheets-assembled morphology with an average diameter of ca. 2.5 m, S BET of 119.6 m 2 g -1 , pore volume of 0.673 cm 3 g -1 , and Zeta potential measurements showed that they were negatively charged with pH ranging from 3 to 10. When employed as the adsorbents for basic fuchsin (BF), the Ni 3 Si 2 O 5 (OH) 4 microspheres showed an adsorption capacity of 120.7 mgg -1 with the removal efficiency up to 96.6% from 50 mgL -1 solution, superior to most of the referred adsorbents in literatures, and the adsorption kinetic data can be well interpretated via the pseudo-second-order model. Data of the relationship between equilibrium adsorption capacity and BF concentration were well fitted by Freundlich isotherm model with the 1/n value of 0.1678, indicating that the surface was heterogeneous and the adsorption strength was strong.
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Research context
OpenAlex topics: Mesoporous Materials and Catalysis · Adsorption and biosorption for pollutant removal · Extraction and Separation Processes
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References (24)
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