Regeneration of ortho-chlorophenol-exhausted activated carbons with liquid water at high pressure and temperature.
ABSTRACT A study was undertaken of the regeneration of three activated carbons exhausted with ortho-chlorophenol. The regeneration process was carried out using liquid water at 623 K and 150 atm in the absence of oxygen. The efficiency of this procedure was analyzed by determining the rate and amount of ortho-chlorophenol adsorbed in successive adsorption-regeneration cycles. The present procedure showed a much greater efficiency than that reported for chemical and/or thermal regeneration. Effects of this regeneration on the adsorption kinetics, adsorption capacity and textural characteristics of the carbon were investigated. The increase in adsorption capacity of the regenerated carbon compared with that of the original carbon seems mainly due to the opening of porosity during the regeneration treatment.
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ABSTRACT: In this work, a new method, called the preconcentration method (PCM), is proposed to increase the adsorption of protein-bound toxins onto adsorbents in artificial liver support systems. In the PCM, a concentrator is installed before the inlet of the adsorbent cartridge. This method is validated in an experiment using activated carbon to remove albumin-bound bilirubin, and the mechanism of the increase in adsorption is theoretically explained with breakthrough curve and equilibrium adsorption analyses. Our results show that when this PCM is used, the mass transfer rate of bilirubin from solution to activated carbon is enhanced, the adsorbed bilirubin amount per unit mass of activated carbon is greatly increased, and more albumin-bound bilirubin molecules are quickly removed from the albumin solution. When the concentration ratio (the ratio of the inlet flow rate to the outflow rate of the concentrator) is 2.59, the adsorption efficiency of activated carbon at 120 min is increased by approximately 36%. Only approximately 60 min is required for the bilirubin concentration to decrease from 19.3 to 13.0 mg/dL; however, without the PCM, nearly 180 min is needed. In addition, by adjusting the concentration ratio, the adsorption of albumin-bound bilirubin onto activated carbon can be further increased.Artificial Organs 03/2014; · 1.96 Impact Factor
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