Tunable synthesis of SiO2-encapsulated zero-valent iron nanoparticles for degradation of organic dyes

Table 1 The initial concentrations of iron salt used in the synthesis

Number	Sample name	The initial concentration of Fe²⁺(mmol)
1	S-0.5	0.5
2	S-1	1
3	S-2	2
4	S-4	4
5	S-8	8