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Gorsi, Ayesha Taj
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article
Sunlight-active, S-g-C3N4 boosts Ni-doped ZnFe2O4 photocatalysts for efficient organic pollutants degradation
Abstract
<p>The advanced oxidation process (AOP) using heterogeneous photocatalysis has been recognized as an effective method for wastewater treatment. Cubic spinel nickel-doped zinc ferrite (Ni@ZnFe<sub>2</sub>O<sub>4</sub>) nanoparticles were prepared using hydrothermal synthesis with varying nickel concentrations (0, 1, 3, 5, 7, and 9 wt %). The nanoparticles and nanocomposites were characterized using XRD, XPS, BET, SEM, PL, TEM, UV–visible spectroscopy and FTIR. Ni@ZnFe<sub>2</sub>O<sub>4</sub> photocatalyst's ability to degrade dye was tested using Methylene blue (MB) as a probe. The 5 % Ni@ZnFe<sub>2</sub>O<sub>4</sub> nanoparticles showed the best photocatalytic efficiency. S@g-C<sub>3</sub>N<sub>4</sub> was constructed using thiourea. To further improve catalytic activity, nanocomposites were made with 5 % Ni@ZnFe<sub>2</sub>O<sub>4</sub> and varying contents of S@g-C<sub>3</sub>N<sub>4</sub> (30, 10, 50, and 70 %). The impact of S@g-C<sub>3</sub>N<sub>4</sub> content on photocatalytic performance was observed. The 50 % S@g-C<sub>3</sub>N<sub>4</sub>/5 %Ni@ZnFe<sub>2</sub>O<sub>4</sub> composite performed best among the samples tested. Its enriched photocatalytic capability is due to synergistic exchanges at the S@g-C<sub>3</sub>N<sub>4</sub>/Ni@ZnFe<sub>2</sub>O<sub>4</sub> interface, facilitating more efficient separation and movement of photogenerated charges. Degradation of MB suggests this material may have applications for water purification.</p>