Recent advances in halloysite nanotube derived composites for water treatment

Yu, Leshu; Wang, Huixian; Zhang, Yatao; Zhang, Bin; Liu, Jindun

doi:10.1039/c5en00149h

Cited by 114 publications

(74 citation statements)

References 106 publications

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“…They are characterized by high mechanical strength and modulus, and due to their hollow nanostructure they are widely used for loading and controlled release of functional compounds (Makaremi et al, 2017;Yang et al, 2016;Huang et al, 2016;Saif and Asif, 2015;Lvov et al, 2016a). HNTs are used in, e.g., self-healing anticorrosive coatings (Wei et al, 2015), hydrogen production and storage (Sahiner and Sengel, 2017;Jin et al, 2017), pharmaceutical excipients (Hanif et al, 2016;Lvov et al, 2016b;Yendluri et al, 2017), biomedical applications Bonifacio et al, 2017), cosmetics (Saif and Asif, 2015), active food packaging materials (Shemesh et al, 2016;Tas et al, 2017;Krepker et al, 2017), water treatment (Yu et al, 2016), and for improvement the mechanical properties and thermal stability of polymer composites (Liu et al, 2014). Globally, HNTs annual production is over 50,000 metric tonnes (Lvov et al, 2008), which is similar to that of carbon fibers (40,000 t/y; Gutiérrez and Bono, 2013), and approximately 10 times higher than the production of carbon nanotubes which is only ca.…”

Section: Introductionmentioning

confidence: 99%

Occupational exposure during handling and loading of halloysite nanotubes – A case study of counting nanofibers

et al. 2018

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A B S T R A C THalloysite nanotubes (HNTs) are abundant naturally-occurring hollow aluminosilicate clay mineral fibers with a typical diameter < 100 nm and an aspect ratio of up to 200. Here we assessed the potential inhalation exposure to HNTs in an industrial research laboratory. Inside a fume hood, ten times 100 g of HNTs were poured at rate of 0.5 kg min . Inside the fume hood, the respirable mass concentration was 143 μg m −3 including background particles.Outside the fume hood we did not measure elevated concentrations. We classified 1895 particles according to their length and aspect ratio. Five particles were in aspect ratio > 3 and in length > 2 μm. These particles were agglomerated and/or aggregated particles where the longest individual fiber was 2 μm in length. The occupational exposure limits for refractory mineral fibers vary from 0.1 to 2 fibers cm −3. Following standard protocols for fiber analysis, detection of 0.1 fibers cm −3 would require analysis on 4 × 10 4 images when the filter loading is good. Thus, the fiber sampling and quantification procedures needs to be improved significantly if nanofibers < 100 nm in diameter are included in regulatory exposure assessment. Due to very limited toxicological information of HNTs we recommend avoiding inhalation exposure.

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Section: Introductionmentioning

confidence: 99%

Occupational exposure during handling and loading of halloysite nanotubes – A case study of counting nanofibers

et al. 2018

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“…However, the dye rejection ratio for M3 still remained high with a value of 88.1% after adding β‐CD‐HNT additives. The explanations were as follows: on one hand, many reports demonstrated that HNTs emerged negative charge at different pH value . As a result, blending β‐CD‐HNTs could also make PVDF membrane surface having negative charge, which had an electrostatic repulsion with negative dyes .…”

Section: Resultsmentioning

confidence: 99%

“…As a result, blending β‐CD‐HNTs could also make PVDF membrane surface having negative charge, which had an electrostatic repulsion with negative dyes . On the other hand, both β‐CD and HNTs have been used as adsorbents for rapid removal of organic pollutants from water due to their high‐surface‐area and abundant hydroxyl groups . They could have an adsorption reaction with dye molecules, which were not rejected by surface pores of the membrane.…”

Section: Resultsmentioning

confidence: 99%

“…Halloysite nanotube (HNT)‐derived composites are new prospective fillers for polymeric composites and have also attracted great interests in the field of wastewater treatment, due to their excellent physical and chemical properties . Zhang et al summarized different HNT‐derived applications, such as the removal of heavy metal ions and dyes. Moreover, a series of novel membranes by blending functionalized HNTs into PES membrane matrix were investigated in the past few years .…”

Section: Introductionmentioning

confidence: 99%

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High‐flux PVDF membrane incorporated with β‐cyclodextrin modified halloysite nanotubes for dye rejection and Cu (II) removal from water

Yang

et al. 2018

Polymers for Advanced Techs

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The application of polyvinylidene fluoride (PVDF) membrane is impeded by its intrinsic hydrophobic property. In this work, a series of novel membranes were fabricated by blending different contents of β‐cyclodextrin modified halloysite nanotubes (β‐CD‐HNTs) into the casting solution. Elemental mapping images confirmed the good dispersion of β‐CD‐HNTs in the PVDF membrane matrix. The microstructure of membrane was improved as revealed by the morphological characterizations. Besides, the permeation and separation performances of all membranes were extensively studied. The results demonstrated that as‐prepared blend membranes exhibited better hydrophilicity, which included lower contact angle and higher water flux than pristine PVDF membrane. In the separation experiments, the dye rejection for the blend membranes was not declined (85%‐90%), even though the pore size of membranes was increased with the addition of β‐CD‐HNT nanoparticles. More importantly, because of the chelation reaction between β‐CD‐HNTs and heavy metal, the removal ratio of Cu (II) for 3 wt.% content of blend membrane could reach 20.9%, compared with unmodified membrane of 4.2%. After 3 filtration cycles, blend membranes showed superior antifouling property. Overall, this method demonstrated very promising characteristics for removing different scales of pollutants using membrane technology.

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“…Surface modification of the nanotubes, increasing the internal cavity as well as the loading them with various functional compounds can contribute to the change in the properties of the resulting polymer matrix ( Figure ).…”

Section: Modifications Of Nanotubes For the Modulation Of Tissue Engimentioning

confidence: 99%

Halloysite Nanoclay/Biopolymers Composite Materials in Tissue Engineering

Naumenko

Fakhrullin

2019

Biotechnology Journal

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Biocompatible materials for the fabrication of tissue substitutes are crucially important in the advancement of modern medicinal biotechnology. These materials, to serve their function, should be similar in physical, chemical, biological, and structural properties to native tissues which they are aimed to mimic. The porosity of artificial scaffolds is essential for normal nutrient transmission to cells, gas diffusion, and cell attachment and proliferation. Nanoscale inorganic additives and dopants are widely used to improve the functional properties of the polymer materials for tissue engineering. Among these inorganic dopants, halloysite nanotubes are arguably the most perspective candidates because of their biocompatibility and functional properties allowing to enhance significantly the mechanical and chemical stability of tissue engineering scaffolds. Here, this vibrant field of biotechnology for regenerative medicine is overviewed.

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Recent advances in halloysite nanotube derived composites for water treatment

Abstract: Halloysite nanotubes (HNTs) are naturally occurring clay mineral with nanotubular structures and have found increasing potential applications in industrial fields.

Cited by 114 publications

References 106 publications

Occupational exposure during handling and loading of halloysite nanotubes – A case study of counting nanofibers

Occupational exposure during handling and loading of halloysite nanotubes – A case study of counting nanofibers

High‐flux PVDF membrane incorporated with β‐cyclodextrin modified halloysite nanotubes for dye rejection and Cu (II) removal from water

Halloysite Nanoclay/Biopolymers Composite Materials in Tissue Engineering

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