Photocatalytic and antimicrobial activities of functionalized silicate sol–gel embedded ZnO–TiO&lt;SUB&gt;2&lt;/SUB&gt; nanocomposite materials

Dhanalakshmi, R.; Pandikumar, Alagarsamy; Sujatha, K.; Gunasekaran, Paramaswamy

doi:10.1166/mex.2013.1133

Cited by 28 publications

(10 citation statements)

References 21 publications

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“…The corresponding TEM (Figure 1(a1,b1,c1,d1)) image shows that materials exhibited a near-spherical in shape [6,9]. Furthermore, the SAED (Figure 1(a2,b2,c2,d2)) pattern obtained for TiO 2 and MONs and the observed ring patterns (brightness and intensity) indicating that the samples are polycrystalline in nature [9,41,42,43], in agreement with the XRD results (data published [6]). According to Maurya and Bhatia [44] discontinuous rings with spots indicate that the particles are made of rather bigger crystallites, this fact is particularly noticeable in T-Z5-M5 sample (Figure 1(d2)) [45,46].…”

Section: Resultsmentioning

confidence: 99%

Effect of TiO2-ZnO-MgO Mixed Oxide on Microbial Growth and Toxicity against Artemia salina

et al. 2019

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Mixed oxide nanoparticles (MONs, TiO2–ZnO–MgO) obtained by the sol-gel method were characterized by transmission electron microscopy, (TEM, HRTEM, and SAED) and thermogravimetric analysis (TGA/DTGA–DTA). Furthermore, the effect of MONs on microbial growth (growth profiling curve, lethal and sublethal effect) of Escherichia coli, Salmonella paratyphi, Staphylococcus aureus and Listeria monocytogenes, as well as the toxicity against Artemia salina by the lethal concentration test (LC50) were evaluated. MONs exhibited a near-spherical in shape, polycrystalline structure and mean sizes from 17 to 23 nm. The thermal analysis revealed that the anatase phase of MONs is completed around 480–500 °C. The normal growth of all bacteria tested is affected by the MONs presence compared with the control group. MONs also exhibited a reduction on the plate count from 0.58 to 2.10 log CFU/mL with a sublethal cell injury from 17 to 98%. No significant toxicity within 24 h was observed on A. salina. A bacteriostatic effect of MONs on bacteria was evidenced, which was strongly influenced by the type of bacteria, as well as no toxic effects (LC50 >1000 mg/L; TiO2–ZnO (5%)–MgO (5%)) on A. salina were detected. This study demonstrates the potential of MONs for industrial applications.

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Section: Resultsmentioning

confidence: 99%

Effect of TiO2-ZnO-MgO Mixed Oxide on Microbial Growth and Toxicity against Artemia salina

et al. 2019

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“…The former is due to the contribution of the direct charge transition of O 2 − 2p→Fe 3+ 3d (UV absorption), and the latter originates from the indirect charge transition of Fe 3+ 3d→3d (visible absorption) [8–10]. The band-gap energy ( E bg ) value of the prepared α -Fe 2 O 3 nanoparticles was derived from the relationship between the absorption coefficient and the incident photon energy of the α -Fe 2 O 3 nanoparticles using Tauc's plot method [11, 12]. Consider

\begin{matrix} α = \frac{A {(h v - E_{bg})}^{n}}{h v}, \end{matrix}

where α is the absorption coefficient, E bg is the band-gap energy, and A is the absorption constant.…”

Section: Resultsmentioning

confidence: 99%

Hematite Nanoparticles-Modified Electrode Based Electrochemical Sensing Platform for Dopamine

Kamali

Pandikumar

Huang

et al. 2014

The Scientific World Journal

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Hematite (α-Fe2O3) nanoparticles were synthesized by the solid transformation of ferrous hydroxide and ferrihydrite in hydrothermal condition. The as-prepared α-Fe2O3 nanoparticles were characterized by UV-vis, PL, XRD, Raman, TEM, AFM, FESEM, and EDX analysis. The experimental results indicated the formation of uniform hematite nanoparticles with an average size of 45 nm and perfect crystallinity. The electrochemical behavior of a GC/α-Fe2O3 electrode was studied using CV and EIS techniques with an electrochemical probe, [Fe(CN)6]3−/4− redox couple. The electrocatalytic activity was investigated toward DA oxidation in a phosphate buffer solution (pH 6.8) by varying different experimental parameters. The chronoamperometric study showed a linear response in the range of 0–2 μM with LoD of 1.6 μM for DA. Square wave voltammetry showed a linear response in the range of 0–35 μM with LoD of 236 nM for DA.

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“…The calculated band gap energies for the allowed direct and indirect charge transitions for the Fe 2 O 3 and PtFe 2 O 3 are 2.10 eV and 2.12 eV, respectively (Table S1). Slightly higher band gap value of 2.12 eV obtained for the PtFe 2 O 3 compared to the Fe 2 O 3 indicates the quantum confinement of the nanoparticles .…”

Section: Resultsmentioning

confidence: 92%

Electrochemical Simultaneous Sensing of Melatonin, Dopamine and Acetaminophen at Platinum Doped and Decorated Alpha Iron Oxide

Manikandan

Dharuman

2017

Electroanalysis

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Simultaneous sensing of dopamine (DA), acetaminophen (AP) and melatonin (MEL) was made by electrochemical method as the drugs melatonin and acetaminophen interact with dopamine in brain to induce neuro disorders. The glassy carbon electrode surface was modified with un‐doped α‐ Fe2O3, platinum doped Fe2O3 (dPtFe2O3), Pt decorated Fe2O3 (sPtFe2O3) and doped and decorated Fe2O3 (sdPtFe2O3) nano particles that are synthesized by co‐precipitation method in presence of polyethylene glycol for the first time. These particles were characterized using Ultra‐Violet Visible (UV‐Vis), scanning electron microscopy (SEM), X‐ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TGA) and electrochemical techniques. The sdPtFe2O3 showed the highest catalytic activity than the dPtFe2O3, sPtFe2O3 and un‐doped α‐ Fe2O3 with well separated voltammetric peaks for DA and AP in presence of MEL. This is attributed to higher surface hydration effects of the sdPtFe2O3, dPtFe2O3 and sPtFe2O3 than the un‐doped Fe2O3 which plays a vital role in enhancing the melatonin sensing in presence of dopamine and acetaminophen. Linear ranges and lowest detection limits for all three analytes were increased by 10 times for the sdPtFe2O3 compared to other Fe2O3 modified electrodes. The sensor is validated using commercially available pharmaceutical drugs used in therapeutics.

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Photocatalytic and antimicrobial activities of functionalized silicate sol–gel embedded ZnO–TiO<SUB>2</SUB> nanocomposite materials

Cited by 28 publications

References 21 publications

Effect of TiO2-ZnO-MgO Mixed Oxide on Microbial Growth and Toxicity against Artemia salina

Effect of TiO2-ZnO-MgO Mixed Oxide on Microbial Growth and Toxicity against Artemia salina

Hematite Nanoparticles-Modified Electrode Based Electrochemical Sensing Platform for Dopamine

Electrochemical Simultaneous Sensing of Melatonin, Dopamine and Acetaminophen at Platinum Doped and Decorated Alpha Iron Oxide

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