An example of integrative chemistry: Combined gelation of boehmite and sodium alginate for the formation of porous beads

Prouzet, Éric; Khani, Zohreh; Bertrand, Marielle; Tokumoto, Miriam Sanae; Guyot-Ferreol, Véronique; Tranchant, Jean‐François

doi:10.1016/j.micromeso.2006.07.011

Cited by 43 publications

(22 citation statements)

References 30 publications

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“…But in the current study, the immobilized bacterial cells were used for Cr (VI) sorption. The calcium alginate gel beads containing biomass are generally porous [27,28]. So, the assumptions used in this study were (a) isothermal process, (b) constant column void fraction, (c) the immobilized cell bead are porous, i.e., there are multiple channels inside the beads, (d) all immobilized beads are spherical, and (e) mainly three steps involved for biosorption of Cr (VI) metal ions: external diffusion from bulk solution to bead surface, surface adsorption in bead, and intra bead diffusion.…”

Section: Diffusion and Sorption Modelmentioning

confidence: 99%

Determination of Kinetic Parameters in the Biosorption of Cr (VI) on Immobilized Bacillus cereus M1 16 in a Continuous Packed Bed Column Reactor

Maiti

Bera

Chattopadhyay

et al. 2009

Appl Biochem Biotechnol

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Due to technological advancement, environment suffers from untreated toxic heavy metal bearing effluent coming from different industries. Chromium (VI) is one of those heavy metals having adverse impact on ecological balance, human, and plant health because of its carcinogenic properties. Biosorption is presented as an alternative to traditional technologies which are costly and inefficient for treatment of industrial wastes containing low amount of heavy metals. In this study, bioremediation of Cr (VI) ions by immobilized Bacillus cereus M(1) (16) was investigated in a laboratory scale packed bed up-flow column reactor. The effect of important parameters, such as the inlet flow rate, influent concentration, and effective bed height, has been studied. External mass transfer, surface adsorption, and intrabead mass transfer were also studied to conclude the rate limiting step for removal of Cr (VI) and to determine the process parameters which are important for biosorption optimization. The external mass transfer coefficient was calculated at different flow rates (6.51 x 10(-2) to 7.58 x 10(-2) cm/min). Using the model, the surface adsorption rate constant (k(ad)) and the intrabead mass transfer coefficient (k (i)) were predicted as 0.0267 x 10(-3) and 0.7465 x 10(-3) l/g/min, respectively. Both are much lower than the external mass transfer coefficient (k(e)). The surface adsorption phenomenon is acting as the rate-limiting step due to its high resistance for removal of Cr (VI).

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Section: Diffusion and Sorption Modelmentioning

confidence: 99%

Determination of Kinetic Parameters in the Biosorption of Cr (VI) on Immobilized Bacillus cereus M1 16 in a Continuous Packed Bed Column Reactor

Maiti

Bera

Chattopadhyay

et al. 2009

Appl Biochem Biotechnol

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“…Thereby, alginate-based porous microparticles in combination with CaCO 3 [27], or in combined gelation with boehmite [28] were obtained. It is known that the porosity of the scaffold materials can be obtained by adding a porogen (NaCl) during scaffold preparation [29].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and adsorption properties of alginate porous beads

et al. 2015

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Original calcium alginate beads with porous structure and high adsorption surface are proposed. The beads were synthesized using sodium alginate in the presence of sodium dodecyl sulfate as foaming agent, NaCl as porogen agent and CaCl 2 as cross-linker. They were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and Brunauer-Emmett-Teller method. The adsorption capacity of beads was tested with methylene blue (MB). The data show that the adsorption efficiency increases with the amount of beads, decreases with pollutant concentration, and is maximal at pH = 9. The adsorption is fast in the first 3 hours, and slows down thereafter. The kinetic results show that the adsorption of MB on alginate porous beads obeys the Langmuir model. A scheme of MB adsorption taking into account the ionic interactions with calcium alginate beads has been proposed.

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“…Hydroxyapatite microspheres for use as injectable bone fillers were gelled and assembled to form a monolith, using a gel‐like vehicle as binder . Preparation of porous alumina beads using boehmite (AlO(OH)) as starting material was studied by Prouzet et al . After calcination at 1000°C, alumina beads with high S BETs between 55 and 76 m 2 /g were achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Sintered and nonsintered calcium phosphate-alginate microspheres for bone tissue engineering, drug or enzyme delivery were prepared by Riberio et al 27,28 and Mateus et al 29 Hydroxyapatite microspheres for use as injectable bone fillers were gelled and assembled to form a monolith, using a gel-like vehicle as binder. 30 Preparation of porous alumina beads using boehmite (AlO(OH)) as starting material was studied by Prouzet et al 31 After calcination at 1000°C, alumina beads with high S BETs between 55 and 76 m 2 /g were achieved. Finally, porous yttrium oxide microparticles made by Kawashita et al were found to be chemically durable after sintering at 1100°C, at least during in situ radiotherapy.…”

Section: Introductionmentioning

confidence: 99%

Ceramic Microbeads as Adsorbents for Purification Technologies with High Specific Surface Area, Adjustable Pore Size, and Morphology Obtained by Ionotropic Gelation

2011

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In this study, we present an ionotropic gelation route for obtaining porous alumina/silica microbeads (MBs) with tailorable morphology, specific surface area (SBET), and pore size, which can directly be sintered into porous, monolithic adsorbents (MAds). After sintering, SBETs from 20 m2/g up to 70 m2/g with open porosities up to 90% could be achieved depending on the silica nanoparticle addition. Due to the significantly increased SBET, a more than 100‐fold faster uptake of model dye molecules was obtained. Pore sizes ranged between 13 and 184 nm with adjustable mono‐ and bimodal size distributions. Depending on silica content and sintering temperature, the MBs were also found to be chemically stable in technologically relevant solvents such as water, acetone, acetonitrile, hydrochloric acid, and methanol for at least 1 week except for sodium hydroxide. By adjusting the processing parameters, spherical, fibrous or irregular microbead morphologies could be obtained. The same route was also successfully applied for obtaining calcium phosphate, titania, and zirconia microbeads. The presented straight‐forward ionotropic gelation route is basically applicable to any other ceramic material and therefore extremely versatile. The obtained MBs and MAds can be further adapted to any type of environmental or biotechnological purification process by additional functionalization steps.

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An example of integrative chemistry: Combined gelation of boehmite and sodium alginate for the formation of porous beads

Cited by 43 publications

References 30 publications

Determination of Kinetic Parameters in the Biosorption of Cr (VI) on Immobilized Bacillus cereus M1 16 in a Continuous Packed Bed Column Reactor

Determination of Kinetic Parameters in the Biosorption of Cr (VI) on Immobilized Bacillus cereus M1 16 in a Continuous Packed Bed Column Reactor

Synthesis, characterization and adsorption properties of alginate porous beads

Ceramic Microbeads as Adsorbents for Purification Technologies with High Specific Surface Area, Adjustable Pore Size, and Morphology Obtained by Ionotropic Gelation

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