磷酸功能化空心二氧化硅的制备及其对Cd<sup>2+</sup>的吸附

doi:10.11896/cldb.21030132

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Abstract In an aqueous solution, 2-cyanoethyltriethoxysilane (CTES) and 3-ureapropyltrimethoxysilane (UDPTMS) are used as the precursors of the core and the outer shell, and ammonia is used as the catalyst. Through a one-step method and differential etching of functional groups urea-based functionalized hollow silica nanospheres (UD-HSNs) were synthesized by the method, and the functionalized silica was converted into phosphoric acid-based functionalized hollow silica nanospheres (H₂O₃P-HSNs) by post-phosphorylation. Through scanning electron microscope (SEM), field emission transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrometer and thermogravimetric (TG) analysis, the morphology, structure and the performance was characterized. The research results show that the particle size distribution of the urea-based and phosphoric acid-based functionalized hollow silica particles is in the range of 450—650 nm, and the shell thickness is in the range of 70—100 nm. The morphology and morphology of the nanoparticles before and after the phosphoric acid group modification the particle size changes little. From the analysis of specific surface area and pore size, hollow silica materials containing urea groups or phosphoric acid groups all have a certain specific surface area. FTIR, EDS, XPS and TG show that the phosphoric acid groups are successfully grafted to the silica in terms of materials, the modified material contains a certain amount of P element, the content of which is about 5%. The adsorption experiment shows that the two materials can gradually approach the saturated adsorption capacity after 120 min. When the pH value is about 6, the material has better adsorption performance when the initial Cd²⁺ concentration is 100—180 mg/L. The maximum adsorption capacity of UD-HSNs is 152.63 mg/g, and the maximum adsorption capacity of H₂O₃P-HSNs is 171.81 mg/g. After 5 cycles of use, the adsorption performance of Cd²⁺ is still 65%—70% of the first time.

Key words： phosphonic acid hollow silica adsorbent

Published: 10 May 2022 Online: 2022-05-09

CLC number:

O641

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	LYU Bo
	CHEN Lianxi

Cite this article:

LYU Bo,CHEN Lianxi. Synthesis of Phosphonic Acid Functionalized Hollow Silica and Its Adsorption of Cd²⁺[J]. Materials Reports, 2022, 36(9): 21030132-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21030132 OR http://www.mater-rep.com/EN/Y2022/V36/I9/21030132

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