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<p>This study was aimed at recovering silica (SiO<sub>2</sub>) from wasted rice husk, which was subsequently loaded onto reduced graphene oxide (rGO) nanosheets via a simple reflux method. The SiO<sub>2</sub>/rGO was investigated utilizing XRD, SEM, EDAX, FTIR, and UV-visible spectroscopy techniques. The energy band gap of SiO<sub>2</sub> and SiO<sub>2</sub>/rGO was determined using UV absorption spectroscopy, and it declined from 2.54&#xa0;eV to 1.12&#xa0;eV. Compared to SiO<sub>2</sub>, methyl violet (MV) has the highest percentage discoloration of SiO<sub>2</sub>/rGO (97%). The study examined the discoloration ability of MV dye at different pH levels (with an improved pH of ~ 9.0) and the catalyst’s recyclability. After six cycles, MV discoloration is around 92.3%, which is equivalent to the 95% discoloration seen in the first cycle. Kinetic experiments demonstrated that both SiO<sub>2</sub> and SiO<sub>2</sub>/rGO are compatible with pseudo-first-order models (R<sup>2</sup> = 0.999). SiO<sub>2</sub>/rGO nanocomposite has a greater discolouration rate constant <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:({K}_{p.f.o}=58.78\times\:{10}^{-3}\:)\)</EquationSource> </InlineEquation> compared to SiO<sub>2</sub>. The radical scavenging activity was determined by using the free radical DPPH. The results showed that 92% activity with an IC<sub>50</sub> of 162.16&#xa0;mg/mL was achieved. Thus, these findings can be used to create more effective photocatalytic discoloration catalysts and antioxidant chemicals.</p>

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Extraction of Silica from Waste Rice Husk and Development of SiO2/rGO Nanocomposite for Dye Purification and Radical Scavenging Applications

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • M. Mylarappa,
  • S. Chandruvasan,
  • R. Sandhya,
  • G. Krishnamurthy,
  • Sowbhagya

摘要

This study was aimed at recovering silica (SiO2) from wasted rice husk, which was subsequently loaded onto reduced graphene oxide (rGO) nanosheets via a simple reflux method. The SiO2/rGO was investigated utilizing XRD, SEM, EDAX, FTIR, and UV-visible spectroscopy techniques. The energy band gap of SiO2 and SiO2/rGO was determined using UV absorption spectroscopy, and it declined from 2.54 eV to 1.12 eV. Compared to SiO2, methyl violet (MV) has the highest percentage discoloration of SiO2/rGO (97%). The study examined the discoloration ability of MV dye at different pH levels (with an improved pH of ~ 9.0) and the catalyst’s recyclability. After six cycles, MV discoloration is around 92.3%, which is equivalent to the 95% discoloration seen in the first cycle. Kinetic experiments demonstrated that both SiO2 and SiO2/rGO are compatible with pseudo-first-order models (R2 = 0.999). SiO2/rGO nanocomposite has a greater discolouration rate constant \(\:({K}_{p.f.o}=58.78\times\:{10}^{-3}\:)\) compared to SiO2. The radical scavenging activity was determined by using the free radical DPPH. The results showed that 92% activity with an IC50 of 162.16 mg/mL was achieved. Thus, these findings can be used to create more effective photocatalytic discoloration catalysts and antioxidant chemicals.