Gamma-radiation assisted preparation of Au/Fe3O4/poly(styrene-sodium styrene sulphonate) magnetic composite microspheres for catalysis

Magnetic Au/Fe3O4/poly(styrene-sodium styrene sulphonate) composite microspheres (Au/Fe3O4/P(St-NaSS) CMs) were successfully prepared via a gamma-radiation method. Au and Fe(3)O(4)were formed at the same time under irradiation and well dispersed on uniform P(St-NaSS) microspheres. The as-prepared CMs exhibit good catalytic properties and recyclable performances for the catalytic reduction of 4-nitrophenol (4-NP). The kinetic rate constants are 8.75 x 10(-3)s(-1)and 7.71 x 10(-3)s(-1)for two samples, respectively. The conversion rate of 4-NP can keep about 95% with catalysts after five cycles. They exhibit good magnetic behavior and have saturation magnetization value of about 9 emu g(-1), which can be easily separated from the solution under external magnetic field. This strategy is efficient and facile, which can be extended to fabricate other CMs.

通过γ辐射法成功制备了磁性金/四氧化三铁/聚（苯乙烯 - 苯乙烯磺酸钠）复合微球（Au/Fe₃O₄/P(St - NaSS) CMs）。在辐射下，金和四氧化三铁同时形成，并均匀分散在均一的P(St - NaSS)微球上。所制备的复合微球对4 - 硝基苯酚（4 - NP）的催化还原表现出良好的催化性能和可回收性能。两个样品的动力学速率常数分别为8.75×10⁻³ s⁻¹和7.71×10⁻³ s⁻¹。经过5次循环后，使用催化剂时4 - NP的转化率能保持在约95%。它们表现出良好的磁性行为，饱和磁化强度值约为9 emu g⁻¹，在外加磁场下可轻易从溶液中分离出来。这种方法高效且简便，可推广用于制备其他复合微球。