Innovative conditioning of algal-based sorbents: Macro-porous discs for palladium sorption

Wang, Shengye; Vincent, Thierry; Roux, Jean‐Claude; Faur, Catherine; Guibal, Eric

doi:10.1016/j.cej.2017.05.103

Cited by 29 publications

(18 citation statements)

References 55 publications

(69 reference statements)

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“…The foams were prepared by ionotropic gelation. The procedure (described in Supplementary Materials ) has been reported in a previous study [ 54 ].…”

Section: Methodsmentioning

confidence: 99%

Algal Foams Applied in Fixed-Bed Process for Lead(II) Removal Using Recirculation or One-Pass Modes

Vincent¹,

Faur

Guibal³

2017

Marine Drugs

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The incorporation of brown algae into biopolymer beads or foams for metal sorption has been previously reported. However, the direct use of these biomasses for preparing foams is a new approach. In this study, two kinds of porous foams were prepared by ionotropic gelation using algal biomass (AB, Laminaria digitata) or alginate (as the reference) and applied for Pb(II) sorption. These foams (manufactured as macroporous discs) were packed in filtration holders (simulating fixed-bed column) and the system was operated in either a recirculation or a one-pass mode. Sorption isotherms, uptake kinetics and sorbent reuse were studied in the recirculation mode (analogous to batch system). In the one-pass mode (continuous fixed-bed system), the influence of parameters such as flow rate, feed metal concentration and bed height were investigated on both sorption and desorption. In addition, the effect of Cu(II) on Pb(II) recovery from binary solutions was also studied in terms of both sorption and desorption. Sorption isotherms are well fitted by the Langmuir equation while the pseudo-second order rate equation described well both sorption and desorption kinetic profiles. The study of material regeneration confirms that the reuse of the foams was feasible with a small mass loss, even after 9 cycles. In the one-pass mode, for alginate foams, a slower flow rate led to a smaller saturation volume, while the effect of flow rate was less marked for AB foams. Competitive study suggests that the foams have a preference for Pb(II) over Cu(II) but cannot selectively remove Pb(II) from the binary solution.

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“…The foams were prepared by ionotropic gelation. The procedure (described in Supplementary Materials ) has been reported in a previous study [ 54 ].…”

Section: Methodsmentioning

confidence: 99%

Algal Foams Applied in Fixed-Bed Process for Lead(II) Removal Using Recirculation or One-Pass Modes

Vincent¹,

Faur

Guibal³

2017

Marine Drugs

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“…The equilibrium uptake capacities of Pd (II) and Cu (II) both increase with the increase of metal concentrations. The uptake capacity of ETA microspheres for Pd (II) attained in this work is comparable with other alginate based adsorbents for Pd (II) uptake . As seen from Fig.…”

Section: Resultsmentioning

confidence: 99%

“…To date, a very limited amount of work has been done on the recovery of palladium or other precious metals by biopolymer‐based adsorbents in dynamic systems . Wang and co‐workers prepared an alginate and polyethyleneimine composite by one‐pot synthesis and used the adsorbent in a fixed‐bed column for Pd (II) recovery . A semi‐continuous process was recently developed for the selective adsorption of Pd (II) from polymetallic solutions using an aminophosphine oxide polymer as adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Modelling and experimental investigation of the adsorption breakthrough behaviors of Pd (II) and Cu (II) by ETA microspheres

Gao

Zhang

Zhao

2018

J of Chemical Tech & Biotech

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BACKGROUND: Epichlorohydrin/thiourea modified alginate (ETA) microspheres prepared by an emulsion method were used as stationary phase in a fixed-bed column to selectively adsorb Pd (II) from bi-metallic solutions. The transport-dispersive model with a linear driving force kinetics equation and a pH-dependent competitive Langmuir isotherm was employed to predict the breakthrough curves of the metal ions from the fixed bed. RESULTS: Good agreement between the model predictions and the experimental results under different operating conditions confirms the validity and accuracy of the mathematical model and the derived model parameters. Metal ions elute faster from the column with steeper breakthrough curves at higher flow rates and relatively higher feed concentrations. The pH value significantly affects the competitive adsorption isotherm as well as the breakthrough curves. The fully loaded packed bed can be regenerated completely by dilute thiourea solution.CONCLUSION: The tailor-made ETA microspheres can be successfully packed in a fixed-bed column to selectively adsorb Pd (II) from bimetallic solutions. The transport-dispersive model is capable of predicting the adsorption performances over a wide range of operating conditions. Industry (II) and Cu (II) ions was continuously fed into the column using a Masterflex L/S peristaltic pump (Co-Parmer, Canada). The effluent was collected in sample tubes by a CF-2 fraction collector (Fisher, Canada) and the concentrations of metal ions were measured J Chem Technol Biotechnol 2018; 93: 3526-3534

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“…The air‐drying process is favoring the formation of closed‐cells compared to freeze‐drying process that forms more open cells. Actually, the freeze‐drying was especially used for preparing macroporous alginate foams that were used as highly‐percolating materials for the sorption of metal ions . The freeze‐drying conditions improve the release of the gas dissolved in the gel and the breaking of the bubbles leads to the formation of an interconnected porous network.…”

Section: Resultsmentioning

confidence: 99%

“…reported the combination of foaming agent with physical and temperature variations for elaborating biopolymer foams . The elaboration of porous biopolymer scaffold has focused abundant research for the last decade using chitosan, alginate, or starch‐based materials for biomedical application although the concept is now expanding to other applications, such as environmental use for metal recovery, or manufacturing of fire retardant materials . Usually sophisticated or expensive drying methods are required using, for example, freeze‐drying or drying under supercritical CO 2 conditions .…”

Section: Introductionmentioning

confidence: 99%

New alginate foams: Box‐Behnken design of their manufacturing; fire retardant and thermal insulating properties

Vincent

Dumazert

Dufourg

et al. 2017

J of Applied Polymer Sci

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A new method for preparing alginate foams with progressive release of copper in the presence of sodium lauryl sulfate (SLS, foaming agent) has been designed. Copper acts as the ionotropic gelling agent through the reaction of copper carbonate with gluconolactone. The process does not require freeze‐drying contrarily to the conventional method used for preparing macroporous alginate foams. The new materials investigated in this study have remarkable thermal properties, including thermal conductivity lower than 0.041 W m−1 K−1 and low heat release (below 2 kJ g−1), which allows labeling these foams self‐extinguishing materials. An experimental design methodology, based on a Box‐Behnken plan with three parameters and three levels, is successfully used for evaluating the impact of the amounts of alginate, SLS, and copper carbonate on the productivity, apparent density, and shrinking at air‐drying. It yielded an optimization of the process for the manufacturing of light, and stable/rigid insulating and thermally stable materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45868.

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Innovative conditioning of algal-based sorbents: Macro-porous discs for palladium sorption

Abstract: International audienc

Cited by 29 publications

References 55 publications

Algal Foams Applied in Fixed-Bed Process for Lead(II) Removal Using Recirculation or One-Pass Modes

Algal Foams Applied in Fixed-Bed Process for Lead(II) Removal Using Recirculation or One-Pass Modes

Modelling and experimental investigation of the adsorption breakthrough behaviors of Pd (II) and Cu (II) by ETA microspheres

New alginate foams: Box‐Behnken design of their manufacturing; fire retardant and thermal insulating properties

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