Tubular one dimensional nanoreactor with unique confinement effect has captured great research interest but is still challenging to realize the synergistically catalytic performance. In this work, a Fe2O3-Au@SiO2 nanoreactor with coaxial cable structure was prepared. The Fe2O3 nanowires and Au nanoparticles were wrapped in SiO2 shell with a non-contact manner, and the relative position of Fe2O3 and Au NPs were precisely controlled. As an efficient H2O2 activator toward catalytic oxidation of toxic organic contaminants, the Fe2O3-Au@SiO2 represent high activity in the photo-Fenton degradation of 2-CP, 4-CP, ciprofloxacin, BPA and so on. The degradation rate of 2-CP reached 87% within 15 minutes, with the reaction rate constant of 0.1029 min-1. Compared with the Fe2O3-Au@SiO2 with intimate contacted Fe2O3 and Au, the Fe2O3-Au@SiO2 displayed a superior kinetic rate constant (4 fold). The non-contacted Fe2O3 and Au nanoparticle not only avoided the possible negative SMSI (strong metal-support interaction) that affect the chemical states, but also displayed efficient synergistic effect and accelerated the catalytic reaction in the confined space. The LSPR effect of Au NPs generated hot electrons, and produced ∙O2- significantly. Meanwhile, the photo-generated electrons transferred to the conduction band (CB) of Fe2O3, promoted Fe2+/Fe3+ cycling. The LSPR effect of Au NPs and scattering in the confined space increased the utilization efficiency of light. Among the homologous composite of Fe2O3-Au@SiO2, the one with void diameter of 10 nm represented highest activity, revealing the electron/mass transport route also was key factor in the system. This work supplies the model for the uncontacted synergistic catalytic theory with confinement space, and also presents new horizons for the design of high-efficiency and stable catalysts for water treatment.

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