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The X-ray fluorescence analyses of diatomite and nZVI-D samples are presented in Table 1. The main chemical compositions of both samples consisted of SiO2, Al2O3, Fe2O3, MgO, TiO2 and K2O. The difference of 8.61% observed in the amount of Fe2O3 in nZVI and nZVI-D corresponds to the amount of nZVI attached to diatomite. The SEM image of diatomite highlights the cylindrical shape of particles with the structure of pores on the surface as shown in Figure 1(a). After n-ZVI was added onto diatomite, there was some partial coverage and pore blocking on the surface of diatomite as shown in Figure 1(b). TEM images of diatomite and nZVI-D are shown in Figure 2(a) and 2(b). It can be seen that some nanoparticles were attached and dispersed on the inner surface of diatomite and some of the nZVI was covered on the outer surface of diatomite. The nZVI appeared as a spherical particle and formed a slightly chain-like aggregate (Prasad et al. 2014) with the particle size ranging between 50 and 80 nm.
Table 1

Chemical compositions of natural diatomite and nZVI-D

FormulaDiatomite (%)nZVI-D (%)
SiO2 79.76 48.40 
Fe2O3 2.49 11.10 
Al2O3 9.61 7.65 
K20.74 1.16 
TiO2 0.17 0.38 
MgO 0.85 0.19 
FormulaDiatomite (%)nZVI-D (%)
SiO2 79.76 48.40 
Fe2O3 2.49 11.10 
Al2O3 9.61 7.65 
K20.74 1.16 
TiO2 0.17 0.38 
MgO 0.85 0.19 
Figure 1

SEM images of (a) diatomite and (b) nZVI supported on diatomite (nZVI-D).

Figure 1

SEM images of (a) diatomite and (b) nZVI supported on diatomite (nZVI-D).

Figure 2

TEM images of (a) diatomite and (b) nZVI supported on diatomite (nZVI-D).

Figure 2

TEM images of (a) diatomite and (b) nZVI supported on diatomite (nZVI-D).

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