Porous ceramic monoliths assembled from microbeads with high specific surface area for effective biocatalysis

Klein, Tanja Yvonne; Treccani, Laura; Thöming, Jorg; Rezwan, Kurosch

doi:10.1039/c3ra41765d

Cited by 10 publications

(9 citation statements)

References 53 publications

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“…Alginates were extensively adopted as adsorbent for ionic dyes (Li et al, 2017 ), wound-healing materials (Sikareepaisan et al, 2011 ), bone substitutes and drug delivery systems (Hess et al, 2016 , 2017 ), food additives (Norajit et al, 2010 ), ceramic adsorbents and filters (Klein et al, 2012 , 2013 ; Brandes et al, 2014 , 2016 ), and so on. One of the most striking characteristics of alginate is its colloidal property, which allows the formation of insoluble gels in the presence of divalent cations, like calcium, via process described by the egg-box model (Johnson et al, 1997 ).…”

Section: Introductionmentioning

confidence: 99%

A New Porous Hybrid Material Derived From Silica Fume and Alginate for Sustainable Pollutants Reduction

et al. 2018

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In this work a new mesoporous adsorbent material obtained from a natural, high abundant raw material and a high volume industrial by-product is presented. The material is consolidated by the gelling properties of alginate and by decomposition of sodium-bicarbonate controlled porosity at low temperatures (70–80°C) at different scale lengths. The structural, thermal, and morphological characterization shows that the material is a mesoporous organic-inorganic hybrid. The material is tested as adsorbent, showing high performances. Methylene blue, used as model pollutant, can be adsorbed and removed from aqueous solutions even at a high concentration with efficiency up to 94%. By coating the material with a 100 nm thin film of titania, good photodegradation performance (more than 20%) can be imparted. Based on embodied energy and carbon footprint of its primary production, the sustainability of the new obtained material is evaluated and quantified in respect to activated carbon as well. It is shown that the new proposed material has an embodied energy lower than one order of magnitude in respect to the one of activated carbon, which represents the gold standards. The versatility of the new material is also demonstrated in terms of its design and manufacturing possibilities In addition, this material can be printed in 3D. Finally, preliminary results about its ability to capture diesel exhaust particulate matter are reported. The sample exposed to diesel contains a large amount of carbon in its surface. At the best of our knowledge, this is the first time that hybrid porous materials are proposed as a new class of sustainable materials, produced to reduce pollutants in the wastewaters and in the atmosphere.

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Section: Introductionmentioning

confidence: 99%

A New Porous Hybrid Material Derived From Silica Fume and Alginate for Sustainable Pollutants Reduction

et al. 2018

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“…The benefit of high specific surface area is particularly obvious in porous architectures where physical/chemical adsorption occurs and has been instrumental in the recent emergence of porous ceramics . Moreover, the large surface area also increases catalyst‐carrier contact area and is beneficial for access to high‐efficient catalytic reaction . Of special note, these outstanding properties that have been achieved in nanofiber/whisker reinforced porous ceramics have not been observed solely based on porous ceramic bodies.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

et al. 2018

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Hierarchical structured porous ceramics have attracted tremendous research interests because of their numerous excellent properties including robust mechanical strength and large surface area. In this work, silicon carbide (SiC)-based porous ceramics with three levels of pore hierarchy are fabricated from silicon particlestabilized foams and a subsequent one-step calcination after they were embedded with coke. Three-dimensional (3D) flexible nanofibrous network is adhered and wrapped on cell walls of porous ceramics, which is readily fine-tuned and tailored by the temperature to provide optimized pore structure. The resultant SiC-based porous ceramics present a density of 1.03 g/cm 3 at a porosity of 72% with a large quantity of hierarchical micro-and macropores. This hierarchical structure leads to robust compressive strength (23.52 MPa) and large surface area (64.32 m 2 /g). The fabrication method is straightforward and sought-after, providing a facile technical route for advanced hierarchical porous ceramics used in filtration and catalysis fields.flexible nanofibrous network, hierarchical porous architecture, mechanical properties, particle-stabilized foam, porous ceramics

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“…This can be overcome by using very small particles as carriers, but then their separation becomes a problem. Another approach is to create highly porous carriers (Ambati et al, 2012;Klein et al, 2013;Shi et al, 2013). The greatest porosity is found in materials that consist of polymer nanofibers (Dai et al, 2010;Tran and Balkus, 2011).…”

Section: Introductionmentioning

confidence: 99%

Poly(2‐ethyloxazoline) as matrix for highly active electrospun enzymes in organic solvents

Plothe

Sittko

Lanfer

et al. 2016

Biotech & Bioengineering

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Nanofibers are advantageous carriers for biocatalysts, because they show lower diffusion limitations due to their high surface/volume ratio. Only a few samples are known where enzymes are directly spun into nanofibers, mostly because there are not many suited polymer carriers. In this study, poly(2-ethyloxazoline) (PEtOx) was explored regarding its usefulness to activate various enzymes in organic solvents by directly electrospinning them from aqueous solutions containing the polymer. It was found that the concentration of PEtOx in the spinning solution and also the swellability of the fibers play a great role in the activity of the enzymes in organic solvents. Using electrospun lipase B from Candida antarctica (CaLB) under optimized conditions revealed a higher carrier activity than the commercial Novozyme 435 with 10 times less immobilized protein. The electrospinning of PEtOx/CaLB fibers onto a stirrer is used to realize a biocatalytic stirrer for organic solvents. Biotechnol. Bioeng. 2017;114: 39-45. © 2016 Wiley Periodicals, Inc.

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Porous ceramic monoliths assembled from microbeads with high specific surface area for effective biocatalysis

Cited by 10 publications

References 53 publications

A New Porous Hybrid Material Derived From Silica Fume and Alginate for Sustainable Pollutants Reduction

A New Porous Hybrid Material Derived From Silica Fume and Alginate for Sustainable Pollutants Reduction

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

Poly(2‐ethyloxazoline) as matrix for highly active electrospun enzymes in organic solvents

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