Toxicity mechanism of carbon nanotubes on Escherichia coli

Young, Yu-Fu; Lee, Hui-Ju; Shen, Yi-Shan; Tseng, Shih Chun; Lee, Chi-Young; Tai, Nyan‐Hwa; Chang, Hwan‐You

doi:10.1016/j.matchemphys.2012.02.066

Cited by 26 publications

(17 citation statements)

References 22 publications

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“…The calculated value of the sorption capacity based on the predicted breakthrough curve produced by the dose-response model, q e,ts cal , is similar to the sorption capacity calculated from the experimental data. Similar findings regarding the relatively good fit of the dose-response model in reproducing the breakthrough curve in a fixed-bed column study has been reported by other researchers 14,16 . The correlation coefficient values (r 2 ) obtained from the Yoon-Nelson and doseresponse models can be considered a good fit (r 2 > 0.92) to the experimental data set under different inlet BPA concentrations with the best fit produced by dose-response model.…”

Section: Effect Of Bisphenol a Concentrationsupporting

confidence: 90%

“…The maximum sorption capacity of CBPs used in our study was determined based on the sorption at an initial BPA concentration of 100 mg.L -1 , which was the highest BPA concentration tested in our study. While direct comparison with the results of previous studies is difficult due to the difference in experimental parameters such as initial concentrations, dosage and temperature, the maximum BPA sorption capacities of CBPs in our study are similar in values to carbonaceous materials reported in the literature 12,14,28,29 . Nevertheless, it should be noted that most of these bio-derived sorbent materials require preparation at high temperatures of 400 o C-1000 o C for carbonization.…”

Section: Sorption Isotherm At Different Particle Sizesupporting

confidence: 79%

“…A variety of methods for removal of recalcitrant EDCs in water and wastewater treatment units were formulated. The strategies considered were physical separation such as membrane filtration and adsorption, chemical treatment with an advanced oxidation process or biological degradation using a microorganism [13][14][15][16][17] .…”

Section: Adsorption For Removal Of Emerging Pollutantsmentioning

confidence: 99%

“…Based on the experimental results, the solution pH of subsequent experiments in this study was adjusted to 6.0, which is lower than the pKa of BPA. Hence, it can be assumed that there was no net electrical charge in the BPA molecules and that the BPA adsorption onto the hybrid bead occurred mainly via nonelectrostatic interaction-namely hydrophobic affinity with Psf and π-π electron coupling between MWCNTs and the π-electrons of the aromatic compounds 14 .…”

Section: Effect Of Ph On Bpa Adsorption To Ca-alg/22%-mwcnt/psf Beadsmentioning

confidence: 99%

“…The effect of important parameters such as flow rates, initial feed concentrations and bed heights on BPA removal were evaluated. Further, dynamic sorption analysis using several sorption models frequently used in the design of a fixed-bed system, namely Adam-Bohart 12 , Yoon-Nelson 13 and dose-response models [14][15][16] , were performed on the obtained experimental data in order to compare the correlational fit between them and eventually to predict the dynamic behaviors of the column sorption. In the second part of this study, we demonstrated the consequent photolytic BPA removal via a batch reactor.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid materials for removal of bisphenol-A from aqueous solution

Hartono¹

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Noxious pollutants such as endocrine disrupting compounds (EDCs) are associated with rapid industrial and urban development. They are difficult to remove using conventional wastewater treatments and thus pose new challenges in environmental remediation. These concerns necessitate more effective and efficient approaches for emerging pollutant removal from wastewater treatment units. (Aim) This study evaluated various strategies for the removal of one of these emerging endocrine disruptor compounds, bisphenol A (BPA). (Scope) In particular, to improve the removal of BPA from aqueous environments, we investigated processes of physical separation of BPA from an aqueous solution through adsorption and then investigated the subsequent integration of adsorption with biological degradation. Among the emerging adsorbent materials, biosorbents predominate due to their low cost and abundance. However, these products have low adsorption capacity. Therefore, to improve these abilities, amphiphilic surfactant treated biosorbent was developed and studied, and the factors affecting its ability to remove BPA were assessed. In the first study, we evaluated pre-treatment of bamboo powder waste, a kind of biosorbents, to remove BPA. Despite the marked increase in removal capacity after treatment with cationic surfactant, its kinetics and adsorption capacity are still considered inferior in comparison to other emerging adsorbent materials. A comparison study was conducted among treated bamboo powder, commercial graphene nanoplatelets, and single-and multi-walled carbon nanotubes (MWCNTs) for the removal of BPA. Our study deduced that carbon nanomaterial (CNM) variants in general possess faster adsorption capacities and kinetics for BPA removal. Indeed, CNM variants have gained tremendous interest as adsorbents due to their high adsorption capacity and improved re-usability through multiple regeneration cycles. However, there are concerns regarding their environmental toxicity, which brings into question about their application as environmentally safe and sustainable adsorbent Abstract ii materials. To overcome this, the second part of our study focused on the development of composite sorbents such as entrapped MWCNTs and TiO 2 inside alginate beads to reduce environmental toxicity and to facilitate the recovery of the used sorbent. Because wastewater treatment plants are operated in continuous mode with limited contact time to reach equilibrium, it was necessary to assess the capability of a sorbent during continuous flow mode to assess its practical application. BPA removal from the composite beads in the column reactors was affected by the feed flow rate, bed depth and initial inlet concentrations. The BPA sorption performance was predicted with good correlation using a dose-response model. We showed that photolytic degradation of BPA desorbed from the beads, and thus the regeneration of the spent adsorbent beads can be achieved simultaneously. Results showed that the alginate beads alone, however, were easily abraded and susceptib...

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Section: Effect Of Bisphenol a Concentrationsupporting

confidence: 90%

Section: Sorption Isotherm At Different Particle Sizesupporting

confidence: 79%

Section: Adsorption For Removal Of Emerging Pollutantsmentioning

confidence: 99%

Section: Effect Of Ph On Bpa Adsorption To Ca-alg/22%-mwcnt/psf Beadsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybrid materials for removal of bisphenol-A from aqueous solution

Hartono¹

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Incorporation of carbon nanotubes in polydimethylsiloxane to control Escherichia coli adhesion

et al. 2018

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Polydimethylsiloxane (PDMS) is widely used as a coating material and in the fabrication of medical implants for the urinary tract and also in biofilm reactors. When this polymer is used in biomedical devices, bacterial adhesion to the surface must be avoided to prevent implant‐related infections, whereas in biofilm reactors, adhesion has to be promoted. In this work, incorporation of carbon nanotubes (CNTs) on PDMS composites was tested to control Escherichia coli adhesion. Pristine and functionalized CNTs were used and the adhesion assays were performed in the hydrodynamic conditions prevailing in the urinary tract. Surfaces were chemically and morphologically characterized by contact angle measurements, scanning electron microscopy, and X‐ray photoelectron microscopy. Incorporation of small amounts (0.1%) of pristine CNTs decreased bacterial adhesion by 20%, whereas functionalized CNTs increased bacterial adhesion also by 20%. This demonstrates that bacterial adhesion can be modulated by incorporating different types of CNTs in the polymer. It is likely that incorporation of higher amounts of CNTs in polymer composites can affect bacterial adhesion by more than 40%. POLYM. COMPOS., 40:E1697–E1704, 2019. © 2018 Society of Plastics Engineers

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