Pt/SDB hydrophobic catalysts, platinum supported on a cross-linked styrene-divinyl benzene copolymer (SDB), were prepared by an impregnating method. The results indicated that the content of the residual double bonds was positively proportional to the amount of divinyl benzene (DVB) and negatively proportional to the amount of initiator. When the molar ratio of DVB to St was 1 : 1, the content of the residual double bonds reached a highest value of 1.248 mmol g−1. The influences of the contents of residual double bonds on the loading amounts of Pt, as well as the catalytic activity and stability of Pt/SDB catalysts were investigated. Performance tests demonstrated that the loading amounts of Pt increased correspondingly, as the contents of residual double bonds increased. Moreover, Pt/SDB with a higher content of residual double bonds generally had a higher column efficiency and a better stability. Interestingly, the column efficiencies of Pt/SDB with a highest content of residual double bond were all above 90% under all experiment conditions.
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-SiO 2 (KH570-SiO 2 ) was used to improve the strength and hydrophobicity of SDB. Then, copolymerization of KH570SiO 2 with St, DVB to produce KH570-SiO 2 /SDB, Divinyl benzene (DVB), styrene (St) glycidyl methacrylate (GMA) to produce KH570-SiO 2 /GMA/SDB. The two kinds of new carriers were characterized by scanning electron microscope, static water contact angle, N 2 adsorption–desorption, transform infrared spectrometry and thermogravimetric analysis. Compared with SDB, both KH570-SiO 2 /SDB and KH570SiO 2 /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 m 2 /g, respective). The Nickel ion was uesd as the model ion of Platinum ion. And then the Ni 2+ adsorption performances of KH570-SiO 2 /SDB and KH570-SiO 2 /GMA/SDB were studied. Experiments show that KH570-SiO 2 /GMA/SDB has a much higher adsorption rate and a bigger adsorption amount. Refinement indicates that the adsorption behaviors of SDB, KH570-SiO 2 /SDB and KH570-SiO 2 /GMA/SDB with Ni 2+ are according to pseudo-first-order kinetic. The adsorption of SDB and KH570-SiO 2 /GMA/SDB obeyed Freundlich isotherm, while the adsorption of KH570-SiO 2 /SDB obeyed Langmuir isotherm.
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