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Antibacterial activity of LaNiO3 prepared by sonicated sol-gel method using combination fuel

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Abstract

Sonicated sol-gel method was used to prepare LaNiO3 from lanthanum nitrate hexahydrate La(NO3)3.6H2O(LN), nickel nitrate Ni(NO3)3.6H2O(NN), glycine and urea. Nanocrystalline LaNiO3 powder was formed after heating at 175 °C in 5 min. Particle size of LaNiO3 nanopowder was determined by Debay Scherrer’s equation and was found 48 nm. Prepared nanocatalyst characterized with the help of XRD, TGA, SEM, IR, BET surface area, EDX. Surface area of LaNiO3 was 9.22 m2/g. We have reported first time good antibacterial activity of LaNiO3 for Staphylococcus aureus. Zone of inhibition for LaNiO3 was 13 mm studied with the help of agar cup method.

Introduction

Over the past few years different nanosized metal oxides are used as antibacterial agents. Metal oxides show antimicrobial activity without causing toxic effect on mammalian cell. Different metal oxides are used as antimicrobial agents. Nanosized HgO antibacterial activity against Escherichia coli [1] silver nanoparticles (AgNPs) inhibits growth of bacteria and shows wound-healing properties [2]. Different metal oxides show antibacterial activity effectively against different gram positive and gram negative bacteria. We had studied antibacterial activity of rhombohedral LaNiO3 against different bacteria and fungi like E. coli, Staphylococcus aureus, Streptococcus spp., Pseudomonas aeruginosa, Bacillus subtilus and Candida albicans. S. aureus is a gram positive bacteria that cause different types of infections.

Different strains of S. aureus able to secrete different enzymes and bring different antibiotic resistance to groups which increases its pathogenic ability [3]. It shows co-evolution with human hosts. This parasitic co-evolution with human hosts led to the bacterium ability to be carried in nasopharynx of humans without causing any type of symptoms or infection. Because of which they are passed throught human population. Therefore fitness of them as species goes on increasing [4] S. aureus shows skin infections, food poisoning, cellulitis, bone and joint infections, bacteremia (bloodsteam infection), animal infections in cats, horses, dogs, chickens, and cows. They were found in the form of biofilm [5]. Biofilm matrix protect embedded cells from antibiotic penetration. They show high resistance to host immune response [6]. Genetic element in S. aureus includes bacteriophages, pathogenicity island, plasmids, transposons, staphylococcal cassette chromosomes that enable them  to show continually evolve and gain new traits which is resistant to antibiotic treatments and host immune response. Because of which there is great genetic variation observed within the S. aureus. Different species of S. aureus are observed, out of which few show infection in human beings (Fig. 1).

Fig. 1
figure1

Image of Staphylococcus aureus bacteria

Nanomaterials are today’s important scientific concern due to their unique properties and possible application. Mostly ABO3 is general formula for mixed metal oxide with rhombohedral type structure where ‘A’ is rare earth alkaline and alkali metal ion that fit into dodecahedral site of frame work and B is 3d, 4d transitional metal ion with octahedral site [7, 8].

Recently various mixed rhombohedral metal oxide nanomaterials have been reported [9] with improved catalytic activity and possibility of use in fuel cells [10]. Various methods like sol-gel [11], co-precipitation [12], liquid mix technique [13], decomposition of mixed oxalate [14], nitrates or arbonates, [15] metalo organic metalo-inorganic precursors are used to prepare LaNiO3.

Sol-gel method is simple process for production of advance material using heat energy by exothermic reaction. Large quantity of mixed metal oxides synthesized by sol-gel method, because of its simple way, short time, low cost and use of simple equipments. Problem of rapid catalytic deactivation is overcome by rhombohedral material due to its well-defined structure which produces highly dispersed metallic particles to promote high activity suppresses coke formation and enhance catalytic stability. [16,17,18,19,20] Mixed metal oxide nanoparticles used for purification of volatile organic compound (Vocs), total combustion of hydrocarbon for energetic conversion, conducting polymers nanocomposites [21], reduction of NOx and automotive emission, photocatalytic degradation of different dyes [22]. Presently various methods are used to synthesis mixed metal oxide like lanthanum nickel oxide due to it’s vast application in different fields [23,24,25].

In present work LaNiO3 was prepared using sonicated sol-gel method in short time, low temperature and relatively simple way using simple equipments and investigation of structural properties and testing catalytic activity of LaNiO3 nanopowder. We have observed antibacterial activity of rhombohedral LaNiO3. Formed mixed metal oxide shows good antibacterial activity for S. aureus. First time we are going to report antibacterial activity of LaNiO3 nanopowder.

Materials and methods

Experimental

LaNiO3 was prepared by sonicated sol-gel combustion method using glycine and urea as combination fuel. All chemical reagents were of analytical grade and used without further purification. stoichiometric quantity of solid mixture of 100 ml of 0.1 M lanthanum nitrate La(NO3) 3.6H2O, 100 ml of 0.1 M nickel hexahydrate Ni(NO3) 3..6H2O (NN), 100 ml of 0.15 M of glycine, 100 ml of 0.15 M of urea were mixed well and sonicated at 5 Hz for 10 min at 60 °C. All solutions were mixed well with the help of magnetic stirrer and dried at 70–80 °C. Formed sol was heated at 175 0C for autocombution on hot plate. At temperature 175 °C LaNiO3 powder was formed within 5 min. Surface area was measured by BET nitrogen gas adsorption method is 9.22 m2/g. Flow sheet diagram of formation of LaNiO3 is as shown in Fig. 2.

Fig. 2
figure2

Flow sheet of preparation of LaNiO3

. heated at 175 °C reaction proceed by mechanism indicated by Eqs. 1 and 2 gives final products

$$ 2 {\text{C}}_{ 2} {\text{NH}}_{ 3} {\text{O}}_{ 2} + 2 {\text{N}}_{ 2} {\text{H}}_{ 4} {\text{CO }} + { 15}/ 2 {\text{O}}_{ 2} \to 3 {\text{N}}_{ 2} + 6 {\text{CO}}_{ 2} + 9 {\text{H}}_{ 2} {\text{O}} $$
(1)
$$ {\text{La}}( {{\text{NO}}_{ 3} })_{ 3} + {\text{ Ni}}( {{\text{NO}}_{ 3} })_{ 2} + {\text{ C}}_{ 2} {\text{H}}_{ 5} {\text{NO}}_{ 2} + {\text{ 2CON}}_{ 2} {\text{H}}_{ 4} \to {\text{LaNiO}}_{ 3} + {\text{ 6H}}_{ 2} {\text{O }} + 5 {\text{N}}_{ 2} + {\text{ O}}_{ 2} + 1/ 2 {\text{ H}}_{ 2} $$
(2)

Results and discussion

XRD of LaNiO3

XRD pattern of LaNiO3 is as shown in Fig. 3. All peaks indexed to rhombohedral structure and show matching with JCPDS card no (00-033-0711). Advanced X-ray diffraction using Cu Kα 1.5456 radiation. Average crystallite size of formed LaNiO3 is calculated by using Scherrer’s formula [26, 27] is 46 nm

$$ {{t }} = 0. 9\lambda /\beta { \cos }\theta \beta , $$
(3)

where λ is wavelength of diffracted peaks and θ is the angle of diffraction, t is average crystallite size. Average crystallite size was calculated by assuming particle to be spherical k = 0.9, β is full width at half maximum and is integral breath that depend on width of most predominant peak. Rhombohedral LaNiO3 oxide have lattice parameters are a = b = 5.4570 °A, c = 6.5720 °A and α = β = 90 °λ = 120°.

Fig. 3
figure3

XRD patterns of LaNiO3. (A) 1:1:1.5:1 ratio of lanthanum nitrate:nickel nitrate:glycine:urea, (B) 1:1:1.5:1.5 ratio of lanthanum nitrate:nickel nitrate:glycine:urea, (C) 1:1:1.5:2 ratio of lanthanum nitrate:nickel nitrate:glycine:urea

Different combinations of lanthanum nitrate, nickel nitrate, glycine and urea in proportion to 1:1:1.5:1, 1:1:1.5:1.5, 1:1:1.5:2 were studied. We obtained good result for 1:1:1.5:1.5 ratio of lanthanum nitrate hexahydrate La(NO3)3.6H2O(LN), nickel nitrate Ni(NO3)3.6H2O(NN), glycine and urea. Different scientist prepared LaNiO3, they subject sample for annealing. We had prepared LaNiO3 by sonicated sol-gel method which did not required calcination. We have saved that energy which required for calcination, this showed green approach.

SEM image Of LaNiO3

To study morphology of formed oxide, scanning electron microscopy technique was used which reveled morphology and porous nature with particle size 45.33 nm.

SEM image of LaNiO3 powder prepared by sonicated sol-gel method using combination fuel at 175 °C is shown as in Fig. 4. To study scanning electron microscope image QUANTA 200 3D model was used. We can also observe macro agglomeration of very fine particles with size less than 1 µm. Many small and large pores are observed on the surface of whole material. SEM images were captured at 1 µm, 10 µm, 500 nm.

Fig. 4
figure4

SEM image of LaNiO3 powder: a 500 nm, b 500 nm, c 1 µm and d 10 µm

BET surface area of LaNiO3

BET surface area of LaNiO3 was measured at 1100 °C by Flow BET Nitrogen Gas ISO S4652/ASTM D-3037/USP846/EP 2.926 adsorption method is 9.22 m2/gm. High surface area of formed rhombohedral LaNiO3 was obtained from BET measurements. Table 1 shows comparative study of surface area of LaNiO3 (Table 2).

Table 1 Comparative study of surface area of LaNiO3
Table 2 Percentage composition of element

From this study it is clear that large surface area is available for any chemical transformation, therefore LaNiO3 will show good catalytic activity. Sonicated sol-gel method provides high surface area metal oxide without calcination process. We have saved that energy used for calcination which reveals green approach. Sonication process shows creation of vaccume and small bubble which form homogeneous mixing of solution. Because of Sonication process change in physical as well as chemical properties of oxide takes place. Hydroxide soles shows critical nucleation process. Growth of particle size starts, after nucleation. Size of metal oxide regulated using sonication. Sonication barriers formation of aggregation of particles. Sonication involves breakage of intermolecular interactions and speed up dissolution. Use of mixed fuels like glycine and urea helps in vigorous combustion and produces nanoparticles.

TG/TGA of LaNiO3

TG curve shows little bit loss might be due to loss of moisture, CO2 and nitrogen, hydrogen gas as shown in Fig. 5. During preparation of rhombohedral LaNiO3 at 175 °C reaction proceeds by mechanism indicated by Eqs. 1 and 2

$$ 2 {\text{C}}_{ 2} {\text{NH}}_{ 3} {\text{O}}_{ 2} + 2 {\text{N}}_{ 2} {\text{H}}_{ 4} {\text{CO }} + { 15}/ 2 {\text{O}}_{ 2} \to 3 {\text{N}}_{ 2} + 6 {\text{CO}}_{ 2} + 9 {\text{H}}_{ 2} {\text{O}} $$
(1)
$$ {\text{La}}\left( {{\text{NO}}_{ 3} } \right)_{ 3} + {\text{ Ni}}\left( {{\text{NO}}_{ 3} } \right)_{ 2} + {\text{ C}}_{ 2} {\text{H}}_{ 5} {\text{NO}}_{ 2} + {\text{ 2CON}}_{ 2} {\text{H}}_{ 4} \to {\text{LaNiO}}_{ 3} + 6 {\text{H}}_{ 2} {\text{O }} + {\text{ 5N}}_{ 2} + {\text{ O}}_{ 2} + \, \raise.5ex\hbox{$\scriptstyle 1$}\kern-.1em/ \kern-.15em\lower.25ex\hbox{$\scriptstyle 2$} {\text{ H}}_{ 2} $$
(2)
Fig. 5
figure5

TG curve of LaNiO3 powder as prepared

TG curve show formed oxide is very stable up to 900 °C as in Fig. 5.

TGA show 11.21 % loss in weight from 210 °C to 800 °C which might be due to loss in moisture, nitrogen, CO2 as in Fig. 6.

Fig. 6
figure6

TGA curve of LaNiO3 powder as prepared

TGA is recorded in nitrogen gas by using Perkin and Elmer’s STA 6000 is shown in Fig. 6. This weight loss and weight gain can be ignorable. This indicated that prepared powder was stable from bigining TGA curve show there is weight loss between 210 °C to 740 °C about 11.21 % which due to loss of moisture, CO2 and nitrogen, hydrogen gas.

EDX of LaNiO3

To study EDX of LaNiO3 ELITE PLUS model is used. To study percentage composition of formed oxide, EDX was studied which show percentage of oxygen is 86.17 %, percentage of lanthanum is 8.88 %, percentage of nickel is 4.95 % as shown in Fig. 7.

EDX results clearly shows that formed LaNiO3 contain only lanthanum, nickel, oxygen without any impurity.

Fig. 7
figure7

EDX curve of LaNiO3 powder as prepared

Antibacterial activity of LaNiO3

Introduction

Use of mixed metal oxides as antibacterial agent has attracted scientist because of their reliable antimicrobial activity effective at low concentration. High surface area and small particle size of mixed metal oxides allows broad range of reaction with bacterial surface [33]. Metal oxides shows antibacterial activity against different gram positive and gram negative bacteria, as they are harmless to mammalian cells and environment also. Nanoparticles are found to be cytotoxic. As cytotoxic effect was size dependant, smaller particle size shows greater efficiency in inhibiting bacterial growth. Biofilm is community of bacteria implanted in self produced extracellular matrix of proteins, polysaccharides along with DNA. Infections which involve biofilm formation are chronic and cause serious damage to human beings. Hence it is major challenge to find alternative therapeutic way to overcome increasing resistance of bacteria to currently used common antibiotics. Use of nanoparticles is found to be showing promising, good antibacterial activity. Although exact bactericidal mechanism of nanoparticles are still being investigated, different nanoparticles are found to be showing striking antimicrobial effects. Bacterial species shows selectivity for particular nanoparticles. Silver nanoparticles shows antibacterial activity efficiently than copper nanoparticles aganist E. coli and S. aureus, while  B. subtilis shows more susceptibility to copper nanoparticles than silver nanoparticles [34]. Nanoparticles of titanium dioxide shows greater antibacterial activity against E. coli than S. typhimurium. Sensitivity and selectivity of bacteria to nanoparticles is related with species. Vancomycin-resistant bacteria like Enterococci found to develop additional outer membrane which covers cellular surface and provide protection to bacteria from vancomycin. Therefore vancomycin capped gold nanoparticles penetrate outer cell membrane, that allows vancomycin to ingress cellular surface [35]. Size of nanoparticles plays important role in it’s toxicity. Scientist studied effect of particle size on antibacterial efficiency. Hayden et al shows 2 nm gold nanoparticles are more toxic to B. subtilis than 6 nm gold nanoparticles [36]. Different types of metal and metal oxide nanoparticles like oxides of copper, silver, zinc, magnesium, gold, calcium shows antibacterial effect against wide varieties of various gram-negative and gram-positive bacteria [37]. Antibacterial activity of metal oxides are found to be effective against gram-negative bacteria E. coli  and  P. aeruginosa and gram-positive S. aureus and B. subtilis [38,39,40,41]. (Fig. 8)

Staphylococcus aureus is a gram-positive bacteria with round shape belongs to family Firmicutes. They able to grow without oxygen [42]. They are opportunistic pathogen produces skin infection, abscesses, respiratory infection, sinusitis, food poisoning. Pathogen strains promote infections by production of virulence factors.

Fig. 8
figure8

Image of Staphylococcus aureus bacteria

Results and discussion

Antibacterial activity of rhombohedral LaNiO3 nanocatalyst was studied for E. coli, S. aureus, Streptococcus spp., P. aeruginosa, B. subtilus and antifungal activity for C. albicans. Zone of inhibition of 13 mm for antibacterial activity was observed for S. aureus as shown in Fig. 9. It was inactive against antifungal activity for C. albicans.

Fig. 9
figure9

Antibacterial activity of LaNiO3 Staphylococcus aureus bacteria

Though exact mechanism of antibacterial activity of rhombohedral LaNiO3 nanocatalyst was not known, it was belived that rhombohedral LaNiO3 catalyst shows antibacterial activity through ion diffusion. We here going to report antibacterial activity of rhombohedral LaNiO3 for S. aureus with good results.

As shown in Table 3 we also study antibacterial activity for E. coli, Streptococcus spp., B. subtilis and antifungal activity C. albicans. LaNiO3 do not shows antibacterial activity for E. coli, Streptococcus spp., B. subtilis and antifungal activity for C. albicans (Table 4).

Table 3 Antibacterial activity of LaNiO3
Table 4 Zone of inhibition of antibiotics for Staphylococcus aureus

Cytotoxicity of LaNiO3

LaNiO3 is nontoxic at low concentration. Toxicity of LaNiO3 was studied in water extract. Brine Shrimps Lethality Assay Method was used to study cytotoxicity of LaNiO3. It was found that LaNiO3 was non-toxic at 10 µg/ml in water and at high concentration 500 µg/ml its toxicity is 20 % as shown in Table 5.

Table 5 Toxicity of LaNiO3

Summary

LaNiO3 nanocatalyst was prepared by using sonicated sol-gel method. The precursors used in this method were lanthanum nitrate hexahydrate La(NO3)3.6H2O(LN), nickel nitrate Ni(NO3)3.6H2O(NN), glycine and urea as combination fuel. Sonication was carried out at 5 Hz for 10 min. After autocombution at 175 °C LaNiO3 was formed. Formed nanomaterial was characterized with the help of XRD, TGA, SEM, IR, BET surface area, EDX. Particle size of LaMnO3 was determined by Debay Scherrer’s equation and was found to be 48 nm. Surface area of nanomaterial was 9.22 m2/g, which was high as compared to other researchers. LaNiO3 nanocatalyst was used to study antibacterial activity. We have reported first time good antibacterial activity of LaNiO3 for S. aureus. Zone of inhibition for S. aureus of LaNiO3 was 13 mm which was studied with the help of agar cup method.

Conclusion

We have successfully prepared rhombohedral LaNiO3 catalyst by sonicated sol-gel method in short time with good surface area, using simple equipments in good yield and reactivity. Prepared LaNiO3 nanocatalyst characterized by XRD, SEM, TG, BET, EDX which shows formed oxide was rhombohedral with size 45.33 nm. Surface area of LaNiO3 was 9.22 m2/g .We have reported first time antibacterial activity of LaNiO3 against S. aureus in good extent.

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Acknowledgements

We are thankful to National Chemical Laboratory, Pune; Department of Chemistry and Department of Physics, Shivaji University Kolhapur; S.P.Consultant Mumbai, Department of Chemistry, Dahiwadi College Dahiwadi for valuable assistance in data collection. I am also thankful to Pavan Dongapure for their guidance.

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Jadhav, A.L., Khetre, S.M. Antibacterial activity of LaNiO3 prepared by sonicated sol-gel method using combination fuel. Int Nano Lett 10, 23–31 (2020). https://doi.org/10.1007/s40089-019-00285-7

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Keywords

  • Sonicated sol-gel method
  • LaNiO3
  • EDX
  • XRD
  • SEM
  • Surface area
  • Antibacterial activity of LaNiO3