Rice husk is an agricultural waste abundant in silica (SiO₂). SiO2 extracted from rice husk has a porous structure, so it has the potential to be used as an adsorbent material. To increase the stability and effectiveness of the adsorption process, silica was modified by adding Polyvinyl Alcohol (PVA) and used to removal Congo red dye. SiO₂ extraction was carried out through a calcination pr…
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