ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Nano-silica hybrid SDB carriers with high strength and hydrophobicity: synthesis, characterization and their application as sorbents of Ni²⁺

Li Yu, Nanjun Chen, Wenjiao Chen, Cailin Liu, Xianyan Ren, Haijun Yang, and Shudong Lin

School of Materials Science and Engineering, State Key Laboratory for Environment-Frie Ndly Energy Materials, Southwest University of Science and Technology, Mianyang, China

E-mail: liucailin2013@163.com

Received: 9 February 2020  Accepted: 24 September 2020

Abstract:

In Liquid Phase Catalytic Exchange (LPCE), the strength and hydrophobicity of styrene-divinylbenzene copolymer (SDB) carrier are key limitation factors for practical applications. In this paper, a surface-modified nano-SiO₂ (KH570-SiO₂) was used to improve the strength and hydrophobicity of SDB. Then, copolymerization of KH570SiO₂ with St, DVB to produce KH570-SiO₂/SDB, Divinyl benzene (DVB), styrene (St) glycidyl methacrylate (GMA) to produce KH570-SiO₂/GMA/SDB. The two kinds of new carriers were characterized by scanning electron microscope, static water contact angle, N₂ adsorption–desorption, transform infrared spectrometry and thermogravimetric analysis. Compared with SDB, both KH570-SiO₂/SDB and KH570SiO₂/GMA/SDB show better performances, such as a higher hydrophobicity(147° and 145°, respective), a higher strength(107.11 N and 115.37 N, respectively), a better thermal stability(373.8 and 435.67 ℃, respectively), and a larger specific surface area(487.253 and 463.673 m²/g, respective). The Nickel ion was uesd as the model ion of Platinum ion. And then the Ni²⁺ adsorption performances of KH570-SiO₂/SDB and KH570-SiO₂/GMA/SDB were studied. Experiments show that KH570-SiO₂/GMA/SDB has a much higher adsorption rate and a bigger adsorption amount. Refinement indicates that the adsorption behaviors of SDB, KH570-SiO₂/SDB and KH570-SiO₂/GMA/SDB with Ni²⁺ are according to pseudo-first-order kinetic. The adsorption of SDB and KH570-SiO₂/GMA/SDB obeyed Freundlich isotherm, while the adsorption of KH570-SiO₂/SDB obeyed Langmuir isotherm.

Keywords: Styrene–divinylbenzene copolymer; Hybird; Nano-SiO2; Silane coupling agent; Glycidyl methacrylate; Adsorption simulation

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01378-w

Chemical Papers 75 (3) 1279–1289 (2021)