Adsorptive Removal of Iron Using SiO₂ Nanoparticles Extracted from Rice Husk Ash

Table 1

Comparison of iron adsorption capacity of SiO₂ extracted from RHA with adsorbent materials in the references.

Adsorbent	Concentration range	Iron adsorption capacity (mg/g)	References
SiO2	0.1–1 ppm	9.0	This study
Coir fibers modifying hydrogen peroxide	73–444 mg/L	7.5	[36]
Coir fibers	73–444 mg/L	2.8	[36]
Pine bark waste	55–111 mg/L	2.0	[37]
Cross-linked chitosan	3–9 ppm	64.1	[38]