Environmentally benign halloysite clay nanotubes as alternative catalyst to metal nanoparticles in H 2 production from methanolysis of sodium borohydride

Şahiner, Nurettin; Sengel, Sultan Butun

doi:10.1016/j.fuproc.2016.12.009

Cited by 75 publications

(20 citation statements)

References 31 publications

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“…It is reported that the HNTs were modified with APTES and HCl to prepared mod functionalized HNTs (HNTs-NH 2 ·HCl) as metal nanoparticles to product H 2 [60]. The results pointed out that the HNTs-NH 2 ·HCl catalysts obtain higher reaction values of HRG than the HNTs catalysts, with the value 813.08 mL·min −1 ·g −1 catalyst and 630.80 mL·min −1 ·g −1 catalyst, respectively.…”

Section: As the Catalystsmentioning

confidence: 99%

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

et al. 2017

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Halloysite nanotubes (HNTs) are natural occurring mineral clay nanotubes that have excellent application potential in different fields. However, HNTs are heterogeneous in size, surface charge, and formation of surfacial hydrogen bond, which lead to weak affinity and aggregation at a certain extent. It is very important to modify the HNTs' surface to expand its applications. In this review, the structural characteristics, performance, and the related applications of surface-modified HNTs are reviewed. We focus on the surface-modified variation of HNTs, the effects of surface modification on the materials and related applications in various regions. In addition, future prospects and the meaning of surface modification were also discussed in HNTs studies. This review provides a reference for the application of HNTs modifications in the field of new nanomaterials.

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Section: As the Catalystsmentioning

confidence: 99%

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

et al. 2017

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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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“…It is reported that the HNTs were modified with APTES and HCl to prepare a mod functionlization HNTs (HNTs-NH2·HCl) as metal nanoparticles to product H2 [52]. And the results point out that the HRG values of HNTs-NH2·HCl catalyst obtain a higher reaction than the HNTs catalyst with the value 813.08mL min − The catalyze system (HNTs-APTMS-Mo-SL) has been synthesized by APTMS grafted on the HNTs and self-assembly way [53].…”

Section: As the Catalystsmentioning

confidence: 99%

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

Yang¹,

Chen²,

Fan³

et al. 2017

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Halloysite nanotubes (HNTs) are natural occurring mineral clay nanotubes that have excellent application potential in different fields. However, HNTs are affected by size effect, surface electron effect and hydrogen bond formation on the surface which lead to weak affinity and prone to reunion at some extent. It is very significant to modify the HNTs' surface for expand its applications. In this review, the structural characteristics, performance and the related applications of surface modification HNTs are reviewed and summarized. we focus on the surface modified methods of HNTs, the effect of surface modification on materials and its related applications in various regions. In addition, future prospects and the meaning of surface modification have been discussed in HNTs studies. This review provided a reference for the application of HNTs modifications in new fields.

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Environmentally benign halloysite clay nanotubes as alternative catalyst to metal nanoparticles in H 2 production from methanolysis of sodium borohydride

Cited by 75 publications

References 31 publications

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

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

Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

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