Interactions of metal ions with chitosan-based sorbents: a review

Application of chitin- and chitosan-based materials for enzyme immobilizations: a review

Global warming resulting from the emission of greenhouse gases, especially CO2, has become a widespread concern in the recent years. Though various CO2 capture technologies have been proposed, chemical absorption and adsorption are currently believed to be the most suitable ones for post-combustion power plants. The operation of the chemical absorption process is reviewed in this work, together with the use of absorbents, such as the ionic liquid, alkanolamines and their blended aqueous solutions. The major concerns for this technology, including CO2 capture efficiency, absorption rate, energy required in regeneration, and volume of absorber, are addressed. For adsorption, in addition to physical adsorbents, various mesoporous solid adsorbents impregnated with polyamines and grafted with aminosilanes are reviewed in this work. The major concerns for selection of adsorbent, including cost, adsorption rate, CO2 adsorption capacity, and thermal stability, are compared and discussed. More effective and less energy-consuming regeneration techniques for CO2-loaded adsorbents are also proposed. Future works for both absorption and adsorption are suggested.

/pdf/a-review-of-co2-capture-by-absorption-and-adsorption-5eczh2835p.pdf

A Review of CO2 Capture by Absorption and Adsorption

Metal complexation by chitosan and its derivatives: a review

http://web.ist.utl.pt/ist11061/leq-II/Documentos/OpUnitarias/BubbleColumnReactors(review).pdf

Bubble column reactors

Absorption of carbon dioxide into aqueous sodium hydroxide and sodium carbonate-bicarbonate solutions

To obtain reliable data on the monoethanolamine system for removing carbon dioxide from gas streams, the rates of absorption of pure carbon dioxide into aqueous monoethanolamine solutions were measured with a surface active agent of 60/sup 0/, 77/sup 0/, 95/sup 0/, and 113/sup 0/F in a liquid jet column and a wetted wall column. Experimental results were analyzed with the chemical absorption theory based on the penetration model. The physical solubility of carbon dioxide in an aqueous MEA solution - as determined from the absorption rates measured in a near pseudo-first-order reaction regime - proved to be considerably larger than the physical solubility in water. The measured absorption rates were in good agreement with the theoretical predictions for gas absorption with an irreversible second-order reaction, when the variation of the physical solubility during the absorption process was taken into account.

Absorption of carbon dioxide into aqueous monoethanolamine solutions

Biopolymer gel particles of alginic acid were found to be a useful material for recovering zinc, cadmium, and lanthanum from aqueous solutions. The metals sorbed by the gel particles could be completely eluted by using dilute HCl solution of 0.1 kmol/m3. The distribution ratios of the individual metals between the gel and liquid phases were measured by using a batch method. The equilibrium data were consistent with predictions made assuming that sorption takes place with the ion-exchange reaction between metal ions and alginic acid. The maximum sorption capacity of the gel particles and the distribution equilibrium constants for the metals were determined by comparing the experimental data with the theoretical predictions. The observed effect of temperature on the distribution equilibrium was insignificant in the range from 15 to 35°C.

Recovery of zinc, cadmium, and lanthanum by biopolymer gel particles of alginic acid

Breakthrough curve for adsorption of mercury(II) on polyaminated highly porous chitosan beads

The rates of absorption of pure sulfur dioxide into aqueous sodium bisulfite, sodium hydroxide, and sodium sulfite solutions with and without a surface active agent were measured at 25°C using a liquid jet column. For the sulfur dioxide-sodium hydroxide system, the rate of absorption into the solution without surface active agent was higher than that into the solution with surface active agent, indicating the existence of the interfacial turbulence. The absorption rates obtained for the present system under the conditions of no interfacial turbulence were in good agreement with the theoretical predictions based on the penetration theory.

Satoru Asai

Papers

Absorption of carbon dioxide into aqueous sodium hydroxide and sodium carbonate-bicarbonate solutions

Absorption of carbon dioxide into aqueous monoethanolamine solutions

Recovery of zinc, cadmium, and lanthanum by biopolymer gel particles of alginic acid

Breakthrough curve for adsorption of mercury(II) on polyaminated highly porous chitosan beads

Absorption of sulfur dioxide into aqueous sodium hydroxide and sodium sulfite solutions