Abstract
Herein we reported the preparation and potential application of SiO2 NPs (SiO2 NPs) for the photocatalytic degradation of methyl red dye in aqueous medium. These are synthesized from rice husk ash (RHA) which was collected from rice mill near Shankaraghatta (Shimoga, Karnataka). Silica was present in large quantity in RHA, hence it can be extracted by an alkaline precipitation method was developed to produce pure silica xerogel. From XRD and FTIR analysis revealed the amorphous nature of SiO2 NPs along with the presence of siloxane group. TEM image confirms the formation of SiO2 NPs at 10 to 20 nm range. Furthermore the stabilization and formation of SiO2 NPs was confirmed by SEM/EDAX and TEM analysis. The photo catalytic activity of prepared pure SiO2 NPs towards remediation of dyes like Methyl red (MR) dye has been tested.
Highlights
Dyes are one of the most hazardous contaminants in aquatic environment because majority of the used dyes are azo reactive dyes which one or several azo (–N = N–) groups associated with substituted aromatic structures [1]
Amorphous SiO2 NPs can be prepared by using rice husk ash via sodium hydroxide is a precipitating agent
Rice husk silica is converted into NaSiO2, as a xerogel it is heated at 80°C to form SiO2 NPs and it is again washed and dried
Summary
Dyes are one of the most hazardous contaminants in aquatic environment because majority of the used dyes are azo reactive dyes which one or several azo (–N = N–) groups associated with substituted aromatic structures [1] These are used in industries like textiles, leather, paper, ceramics, and food-processing technologies. The released wastewater from these causes the carcinogenic and mutagenic diseases to human health and environment These show the deleterious effect of the colour in the receiving water bodies and environment [2]. It was well known that methyl red dye has been used in paper printing and textile dyeing [3] It may cause eye and skin sensitization and digestive tract irritation if inhaled or swallowed [4]. Essential to remove the dye from wastewater and inevitable to investigate new alternatives for the adequate treatment of these azo based dyes
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