Adsorption kinetics of Escherichia coli and Staphylococcus aureus on single-walled carbon nanotube aggregates

Upadhyayula, Venkata K.K.; Deng, Shuguang; Mitchell, Martha C.; Smith, Geoffrey B.; Nair, Vinod S.; Ghoshroy, Soumitra

doi:10.2166/wst.2008.634

Cited by 33 publications

(8 citation statements)

References 12 publications

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“…As it was already commented with other antimicrobial nanotube structures, the mechanism of toxicity can be also influenced by other factors such as diameter, length and surface chemistry that influence on diffusion of bacteria into these structures. Research developed by Upadhyayula et al to determine adsorption kinetics of E. coli and S. aureus on single-walled carbon nanotubes have revealed diffusivity of bacterial cells are concentration and bacteria dependent [ 67 , 68 ]. As a result, TDN antimicrobial activity was even higher than commercial TiO 2 NPs.…”

Section: Resultsmentioning

confidence: 99%

Novel Antimicrobial Titanium Dioxide Nanotubes Obtained through a Combination of Atomic Layer Deposition and Electrospinning Technologies

et al. 2018

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The search for new antimicrobial substances has increased in recent years. Antimicrobial nanostructures are one of the most promising alternatives. In this work, titanium dioxide nanotubes were obtained by an atomic layer deposition (ALD) process over electrospun polyvinyl alcohol nanofibers (PVN) at different temperatures with the purpose of obtaining antimicrobial nanostructures with a high specific area. Electrospinning and ALD parameters were studied in order to obtain PVN with smallest diameter and highest deposition rate, respectively. Chamber temperature was a key factor during ALD process and an appropriate titanium dioxide deposition performance was achieved at 200 °C. Subsequently, thermal and morphological analysis by SEM and TEM microscopies revealed hollow nanotubes were obtained after calcination process at 600 °C. This temperature allowed complete polymer removal and influenced the resulting anatase crystallographic structure of titanium dioxide that positively affected their antimicrobial activities. X-ray analysis confirmed the change of titanium dioxide crystallographic structure from amorphous phase of deposited PVN to anatase crystalline structure of nanotubes. These new nanostructures with very large surface areas resulted in interesting antimicrobial properties against Gram-positive and Gram-negative bacteria. Titanium dioxide nanotubes presented the highest activity against Escherichia coli with 5 log cycles reduction at 200 μg/mL concentration.

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Section: Resultsmentioning

confidence: 99%

Novel Antimicrobial Titanium Dioxide Nanotubes Obtained through a Combination of Atomic Layer Deposition and Electrospinning Technologies

et al. 2018

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“…So, these modified membranes can be utilized in biomedical and industrial applications with the synergistic effect of absorption and desorption of bacteria off the membrane surface. 26,47,[60][61][62] Inactivation of E. coli bacteria on the modified membranes and reduction of biofilm…”

Section: Bacterial Attachment (Biofilm Assay)mentioning

confidence: 99%

<p>Nanoporous solid-state membranes modified with multi-wall carbon nanotubes with anti-biofouling property</p>

Alizadeh

Ghaedi

Jannesar

2019

IJN

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Purpose: Nanoporous membranes have been employing more than before in applications such as biomedical due to nanometer hexagonal pores array. Biofouling is one of the important problems in these applications that used nanoporous membranes and are in close contact with microorganisms. Surface modification of the membrane is one way to prevent biofilm formation; therefore, the membrane made in this work is modified with carbon nanotubes. Methods: In this work, nanoporous solid-state membrane (NSSM) was made by a two-step anodization method, and then modified with carbon nanotubes (NSSM-multi-wall carbon nanotubes [MWCNT]) by a simple chemical reaction. Techniques such as atomic force microscopy (AFM), energy dispersive X-ray (EDAX), field emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), contact angle (CA), surface free energy (SFE), protein adsorption, flow cytometry, and MTT assay were used for membrane characterization. Results: The BSA protein adsorption capacity reduced from 992.54 to 97.24 (μg mL-1 cm-2) after modification. The findings of flow cytometry and MTT assay confirmed that the number of dead bacteria was higher on the NSSM-MWCNT surface than that of control. Adsorption models of Freundlich and Langmuir and kinetics models were studied to understand the governing mechanism by which bacteria migrate to the membrane surface. Conclusion: The cell viability of absorbed bacteria on the NSSM-MWCNT was disrupted in direct physical contact with carbon nanotubes. Then, the dead bacteria were desorbed from the surface of the hydrophilic membrane. The results of this research showed that NSSM-MWCNT containing carbon nanotubes have significant antimicrobial and self-cleaning property that can be used in many biomedical devices without facing the eminent problem of biofouling.

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“…CNTs (one of nanosorbents) which have been used for removal of biological impurities have received special attention for their excellent capabilities of removing biological contaminants from water [63]. CNTs possess antimicrobial characteristics against a wide range of microorganisms including bacteria such as E. coli and Salmonella [217][218][219][220][221][222] and viruses [223,224]. The adsorption of cyanobacterial toxins on CNTs is also higher when compared with carbon-based adsorbents mainly due to large specific surface area, external diameter of CNTs, large composition of mesoporous volume, and so forth [225][226][227][228].…”

Section: Cnts and Othersmentioning

confidence: 99%

A Review of Removal of Pollutants from Water/Wastewater Using Different Types of Nanomaterials

Amin

Alazba

Manzoor

2014

Advances in Materials Science and Engineering

599

203

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The rapidly increasing population, depleting water resources, and climate change resulting in prolonged droughts and floods have rendered drinking water a competitive resource in many parts of the world. The development of cost-effective and stable materials and methods for providing the fresh water in adequate amounts is the need of the water industry. Traditional water/wastewater treatment technologies remain ineffective for providing adequate safe water due to increasing demand of water coupled with stringent health guidelines and emerging contaminants. Nanotechnology-based multifunctional and highly efficient processes are providing affordable solutions to water/wastewater treatments that do not rely on large infrastructures or centralized systems. The aim of the present study is to review the possible applications of the nanoparticles/fibers for the removal of pollutants from water/wastewater. The paper will briefly overview the availability and practice of different nanomaterials (particles or fibers) for removal of viruses, inorganic solutes, heavy metals, metal ions, complex organic compounds, natural organic matter, nitrate, and other pollutants present in surface water, ground water, and/or industrial water. Finally, recommendations are made based on the current practices of nanotechnology applications in water industry for a stand-alone water purification unit for removing all types of contaminants from wastewater.

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Adsorption kinetics of Escherichia coli and Staphylococcus aureus on single-walled carbon nanotube aggregates

Cited by 33 publications

References 12 publications

Novel Antimicrobial Titanium Dioxide Nanotubes Obtained through a Combination of Atomic Layer Deposition and Electrospinning Technologies

Novel Antimicrobial Titanium Dioxide Nanotubes Obtained through a Combination of Atomic Layer Deposition and Electrospinning Technologies

<p>Nanoporous solid-state membranes modified with multi-wall carbon nanotubes with anti-biofouling property</p>

A Review of Removal of Pollutants from Water/Wastewater Using Different Types of Nanomaterials

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