| Autor: |
Sidiqua, M. Ayisha, Priya, V. S., Begum, Nishath, Aman, Noor |
| Zdroj: |
Nanotechnology for Environmental Engineering; June 2023, Vol. 8 Issue: 2 p555-565, 11p |
| Abstrakt: |
ZnFe2O4-reduced graphene oxide (rGO) nanocomposite materials are synthesized by hydrothermal cum pyrolysis method using banana leaves as the carbon source for the degradation of malachite green (MG) and basic yellow dyes (BY). ZnFe2O4-rGO (ZB) ratios are varied as 1:6, 1:3, 1:1 and 3:1. XRD shows the presence of ZnFe2O4, rGO and CaSiO3. FE-SEM displays the hierarchical nano-flower type exfoliated rGO layers formed due to the intercalation of ZnFe2O4nanoparticles in between the graphite layers with a size 15–35 nm. FT-IR confirms the presence of M–O, OH and C–O–C functionalities in the ZB samples. Integration of ZnFe2O4and rGO appreciably improves the surface area and pore volume to 342 m2/g and 0.238 cc/g, respectively, for ZnFe2O4-rGO 1:3 (ZB3). All the nanocomposite materials exhibit superparamagnetism with an increase in saturation magnetization on increasing the carbon ratio till ZB3. UV–visible (DRS) indicates that adding carbon into ZnFe2O4helps to reduce the bandgap from 1.9 to 1.14 eV. Raman spectra validate the presence of the bilayer rGO in the synthesized samples. ZB3 exhibits complete degradation of MG and BY within 60 min of visible light irradiation following pseudo-first-order kinetics. The optimum conditions for MG and BY are obtained at pH 7 and 10, respectively. Higher activity of ZB3 is attributed to its small crystallite size, high surface area, extended visible-NIR light absorption and formation of ZnFe2O4-rGO heterojunction. This study will help in the use of waste biomass for the synthesis of rGO-based photocatalytic material towards waste water treatment. |
| Databáze: |
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