Removal of Cu(II) by Fixed-Bed Columns Using Alg-Ch and Alg-ChS Hydrogel Beads: Effect of Operating Conditions on the Mass Transfer Zone
Autor: | Carlos F. Jasso-Gastinel, Ilse Paulina Verduzco-Navarro, Alvaro de Jesús Martínez-Gómez, Eduardo Mendizábal, Nely Rios-Donato |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Polymers and Plastics
Proton Analytical chemistry chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Article Ion lcsh:QD241-441 fixed-bed chemistry.chemical_compound Adsorption lcsh:Organic chemistry Mass transfer alginate Sulfate 0105 earth and related environmental sciences Aqueous solution Chemistry General Chemistry 021001 nanoscience & nanotechnology Copper Volumetric flow rate adsorption copper chitosan 0210 nano-technology |
Zdroj: | Polymers Volume 12 Issue 10 Polymers, Vol 12, Iss 2345, p 2345 (2020) |
ISSN: | 2073-4360 |
DOI: | 10.3390/polym12102345 |
Popis: | The removal of Cu(II) ions from aqueous solutions at a pH of 5.0 was carried out using fixed-bed columns packed with alginate-chitosan (Alg-Ch) or alginate-chitosan sulfate (Alg-ChS) hydrogel beads. The effect of the initial Cu(II) concentration, flow rate, pH, and height of the column on the amount of Cu removed by the column at the breakpoint and at the exhaustion point is reported. The pH of the solution at the column&rsquo s exit was initially higher than that at the entrance, and then decreased slowly. This pH increase was attributed to proton transfer from the aqueous solution to the amino and COO&minus groups of the hydrogel. The effect of operating conditions on the mass transfer zone (MTZ) and the length of the unused bed (HLUB) is reported. At the lower flow rate and lower Cu(II) concentration used, the MTZ was completely developed and the column operated efficiently by increasing column height, the MTZ has a better opportunity to develop fully. Experimental data were fitted to the fixed-bed Thomas model using a non-linear regression analysis and a good correspondence between experimental and Thomas model curves was observed. |
Databáze: | OpenAIRE |
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