Polypropylene–MWCNT composite degradation, and release, detection and toxicity of MWCNTs during accelerated environmental aging

Cui, Han; Sahle‐Demessie, Endalkachew; Varughese, Eunice A.; Shi, Honglan

doi:10.1039/c9en00153k

Cited by 24 publications

(29 citation statements)

References 69 publications

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“…Water 2019, 11, x FOR PEER REVIEW 5 of 16 shifted slightly upward, which exhibited the enhanced thermal stability of the CNIM due to the presence of CNTs [47]. The contact angles of the unmodified PP and CNIM for pure water and salt solution are shown as above in Figure 4.…”

Section: (C)mentioning

confidence: 94%

“…It can be seen from the TGA curves that both membranes are quite stable within the operating temperature ranges. The initial weight loss of the membrane was started at~270 • C and it completely decomposed at~380 • C. The TGA curve for CNIM shifted slightly upward, which exhibited the enhanced thermal stability of the CNIM due to the presence of CNTs [47].…”

Section: Dcmd Performancementioning

confidence: 98%

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Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Humoud

Roy

Mitra

2019

Water

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Membrane distillation (MD) is fast evolving as a desalination technology for high-salinity waters where scaling remains a major challenge. This paper reports the scaling reduction in carbon nanotube-immobilized membranes (CNIMs) and by the use of the antiscalant polyacrylic acid. High concentrations of CaSO 4 , CaCO 3 , and BaSO 4 were deliberately used to initiate scaling on the membranes. It was observed that after ten hours of operation in a highly scaling CaSO 4 environment, the CNIM showed 127% higher flux than what was observed on a membrane without the CNTs. The trends were similar with CaCO 3 and BaSO 4 , where the CNIM showed significantly improved antiscaling behavior. The normalized flux declination for CNIM was found to be 45%, 30%, and 53% lower compared to the pristine membrane with CaSO 4 , CaCO 3 , and BaSO 4 solutions, respectively. The use of antiscalant in the feed solution was also found to be effective in improving antiscaling behavior, which reduced salt deposition up to 28%, and the water vapor flux was 100% and 18% higher for the pristine polypropylene and CNIM, respectively. Results also showed that the presence of CNTs facilitated the removal of deposited salts by washing, and the CNIM regained 97% of its initial water flux, whereas the polypropylene only regained 85% of the original value.

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Section: (C)mentioning

confidence: 94%

Section: Dcmd Performancementioning

confidence: 98%

Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Humoud

Roy

Mitra

2019

Water

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“…Similar surface morphology of CNT/PP composites has been observed in some other research works. 31,32 Figure 3(e) and (f) indicates that the addition of HAp-CNT in the PP matrix brings better uniformity for dispersion of nanomaterial within the polymer matrix. In comparison to CNT/PP composites, the surface of nanotubes present in the crosssection of tensile fractured HAp-CNT/PP composites is conical.…”

Section: Morphology Of the Compositesmentioning

confidence: 98%

Effect of addition of hydroxyapatite as secondary filler in CNT-reinforced polypropylene hybrid composites

Chaudhary

Panwar

Roy

et al. 2020

Polymers and Polymer Composites

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This work entails the effectiveness of hydroxyapatite (HAp) as secondary filler in polypropylene (PP) matrix composites reinforced with HAp-decorated multiwalled carbon nanotubes (MWCNTs). Different composites were prepared through the melt mixing approach. The consequent effect of typical biocompatible ceramic coating on the dispersion of CNTs in a PP matrix and thereby effect on its thermal and mechanical properties have been discussed in this research work. Isothermal hydroxylation technique has been used for the coating of HAp on MWCNTs. It has been observed from the collective information obtained from X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectroscopy and field-emission scanning electron microscopy images that HAp constitutes a new phase in the HAp-CNT nanocomposite in the form of a coating of HAp over nanotubes. As a result of which, the use of HAp-coated MWCNTs in PP improved its tensile strength by 38%, modulus of elasticity by 72%, storage modulus by 43% and ductility by around 7.4% in comparison to uncoated MWCNT-reinforced PP composite. However, the coating of HAp shows an insignificant effect for change in temperature-dependent properties of the CNT/PP composites. The improvement in mechanical properties is attributed to the interfacial compatibility between HAp and PP.

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“…Spectroscopic analysis, such as infrared, Raman, and X-ray photoelectron spectroscopies, is the most commonly applied method to evaluate the structural changes of plastics during degradation evolution. − Taking infrared spectroscopy as an example, the change of carbonyl group has been regarded as an important index to evaluate the state of plastics. , However, carbonyl groups can be widely found in acids, ketones, aldehydes, or esters . As a result, the species and the molecular weights (MWs) of degradation products cannot be accurately identified by infrared spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Mass Spectrometry Imaging of Low-Molecular-Weight Phenols Liberated from Plastics

Tian

2021

Anal. Chem.

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The abundant and heterogeneous distribution of toxic phenol from plastics has drawn worldwide attention. However, the common analysis methods failed to identify the accurate species of these phenolic hazards from plastics in a direct and nondestructive approach. Herein, we demonstrate the layered double hydroxides (LDHs) as a novel matrix in matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) for low-molecular-weight phenols leaked from plastics. LDHs own abundant hydroxyl groups to facilitate chemoselectivity and ionization of phenols through the formation of hydrogen bonds with these phenols. More importantly, the LDH matrix could provide a distinguishable signal for the homolog and isomeride of these phenolic hazards. The developed method could realize nondestructive and in situ mapping of phenolic hazards in plastics. Our success could help to track the lowmolecular-weight compounds liberated from plastics and supply spatial information for polluted plastics. We anticipated that the proposed approach could provide sufficient information to evaluate and alarm the safety of food packaging plastics.

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Polypropylene–MWCNT composite degradation, and release, detection and toxicity of MWCNTs during accelerated environmental aging

Abstract: Accelerated weathering of MWCNT–polypropylene composites with different thicknesses, characterization of aging and toxicity screening of released fragments on human epithelial cells.

Cited by 24 publications

References 69 publications

Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Scaling Reduction in Carbon Nanotube-Immobilized Membrane during Membrane Distillation

Effect of addition of hydroxyapatite as secondary filler in CNT-reinforced polypropylene hybrid composites

Mass Spectrometry Imaging of Low-Molecular-Weight Phenols Liberated from Plastics

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