Abstract
Abstract To study the effect of improved adsorption property of tetrapod-like ZnO (T-ZnO) on its photocatalytic performance, a new composite was prepared by loading silica aerogels (SiO2(AG)) on the surface of T-ZnO via the sol–gel method. Various characterization methods showed that SiO2(AG) was uniformly loaded on the surface of T-ZnO, and the morphology as well as structural characteristics of SiO2(AG) and T-ZnO were not changed. Nitrobenzene (NB) was selected as the model pollutant, and the adsorption and photocatalytic properties of T-ZnO and SiO2(AG)/T-ZnO for NB were studied. The photocatalytic degradation processes of NB using T-ZnO and SiO2(AG)/T-ZnO followed the first-order reaction. Considering the initial moment reaction kinetic, the photocatalytic kinetic of SiO2(AG)/T-ZnO and T-ZnO was consistent with the Langmuir–Hinshelwood kinetic model, and reaction rate constant k SiO 2 AG / T-ZnO ′ > k T-ZnO ′ {k}_{{\text{SiO}}_{2}\left(\text{AG}\right)/\text{T-ZnO}}^{^{\prime} }\gt {k}_{\text{T-ZnO}}^{^{\prime} } , adsorption rate constant K ad SiO 2 ( AG ) / T-ZnO {K}_{\text{ad}{\text{SiO}}_{2}(\text{AG})/\text{T-ZnO}} > K ad T-ZnO, which demonstrated that SiO2(AG) loading could increase T-ZnO adsorption to NB, then promoted its photocatalytic performance.
Highlights
To study the effect of improved adsorption property of tetrapod-like ZnO (T-ZnO) on its photocatalytic performance, a new composite was prepared by loading silica aerogels (SiO2(AG)) on the surface of T-ZnO via the sol–gel method
Effect of SiO2 aerogels loading on photocatalysis of composites with tetrapod-like ZnO 1011 under UV (EA-180, 8w; Spectronics Corporation, America)
The SEM image of SiO2(AG)/T-ZnO nanocomposites (Figure 1b) shows typical structures with four needles extending from the same center, ascribable to the T-ZnO [18] and SiO2(AG) particles uniformly loaded on the surface of these needles
Summary
Abstract: To study the effect of improved adsorption property of tetrapod-like ZnO (T-ZnO) on its photocatalytic performance, a new composite was prepared by loading silica aerogels (SiO2(AG)) on the surface of T-ZnO via the sol–gel method. Porous materials such as activated carbon, zeolites, and SiO2 were actively investigated as advanced sorbents [39] Many of these porous materials have been used as support materials; loading of TiO2, ZnO, and other semiconductors in the porous materials has improved their adsorption and photocatalytic activity [40,41,42]. To study the effect of improved adsorption property of T-ZnO on its photocatalytic performance, we prepared SiO2(AG)/T-ZnO composites via the sol–gel method, and nitrobenzene (NB) was selected as the model pollutant. The Langmuir–Hinshelwood kinetic model was used to calculate the photodegradation kinetic parameter
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