Preparation, formation mechanism, photocatalytic, cytotoxicity and antioxidant activity of sodium niobate nanocubes

Abstract

A hydrothermal method was employed to prepare the sodium niobate (NaNbO3) nanocubes. We executed time dependent experiments to illustrate the formation mechanism of sodium niobate nanocubes. It was observed that the morphology of NaNbO3 nanocubes was dependent on the reaction time and 12hr reaction time was found to be suitable. Morphology, composition, structure and optical properties of sodium niobate nanocubes were evaluated by scanning electron microscope, X-ray energy-dispersive spectrometer, X-ray diffraction and UV-visible diffuse reflectance spectrometer. The photocatalytic activity of sodium niobate was studied for photocatalytic hydrogen production. It was anticipated that the sodium niobate (NaNbO3) cubes exhibited good photocatalytic activity under UV light irradiation using lactic acid as sacrificial agent. The cytotoxicity activity of sodium niobate nanocubes was studied as well at different concentrations (5 mg/mL, 3 mg/mL, 1 mg/mL, and 0.25 mg/mL) against human colon colorectal carcinoma cell line (HCT116) by MTT assay and EC50 was found to be 1.9 mg/mL. Sodium niobate proved to be a good DPPH free radical scavenging material, tested at different concentrations. It was noticed that peak intensity at 517 nm was decreased after 30 minute incubation, further supporting the antioxidant activity. This study will be useful for design and engineering of materials that can be used in biomedical applications and in photocatalysis.

Fast synthesis of NaNbO3 nanoparticles with high photocatalytic activity for degradation of organic dyes

“…14 It has many technological application properties, and, among them, the photocatalytic applications presented in the literature showed excellent results. 13 13,[15][16][17][18][19][20][21][22][23] Being a promising photocatalyst because it is thermodynamically stable, has high corrosion resistance, and is nontoxic. 22,24 However, studies have shown that the natural particle shape of NaNbO 3 is cubic and presents low photocatalytic activity, but in syntheses with hydrothermal conditions followed by heat treatment, it is possible to obtain the semiconductor in the form of nanowires, with high photocatalytic activity.…”

Free-Standing PVDF/Reduced Graphene Oxide Film for All-Solid-State Flexible Supercapacitors towards Self-Powered Systems

“…The final product was annealed further at 600 • C for 12 h to obtain pure sodium niobate nanocubes. The reaction mechanism in the formation of sodium niobate is due to orientation attached with an Ostwald ripening process as reported in the earlier works [23,24].…”

Sonochemical synthesis of ZnCo2O4/Ag3PO4 heterojunction photocatalysts for the degradation of organic pollutants and pathogens: a combined experimental and computational study

“…The MTT assay 78,79 was employed to study the cytotoxicity of ZnCo 2 O 4 /Ag 3 PO 4 nanoparticles. MCF-7, HCT116 and HFF cells were treated with various concentrations (0.0625–1.0 mg mL −1 ) of ZnCo 2 O 4 /Ag 3 PO 4 nanoparticles for 24 h as described in the Experimental section.…”

“…9 shows that in principle both semiconductor VBs can spontaneously reduce diatomic oxygen gas to produce liquid water according to 1/2O 2 (g) + 2H + (aq) + 2e À -H 2 O (l), which has a reduction potential of 1.23 V vs. NHE. However, the CB potentials are not low enough to reduce protons and release H 2 gas (2H + (aq) + 2e The MTT assay 78,79 was employed to study the cytotoxicity of ZnCo (4 mg mL À1 ). In the case of C. albicans, the minimal fungicidal concentration (MFC) value was 5 mg mL À1 (Fig.…”