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You searched for subject:( unmodified AND neutralized adsorbents). One record found.

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Addis Ababa University

1. Admasu, Adamu. Adsorptive Removal of Reactive Azo Dyes using Industrial Residue .

Degree: 2008, Addis Ababa University

The potential of waste residue obtained from alum manufacturing process to remove problematic reactive azo dye (Cibacron brilliant red 3B-A) was investigated. Batch adsorption experiments were carried out to find out the effects of contact times, adsorbent doses, initial dye concentrations, and final pH on the adsorption of the dye by both unmodified and neutralized adsorbents. The results of the experiment showed that from initial dye concentration of 50 mg/L, the adsorption of dye was rapid in the first 15 and 30 minutes of contact time and equilibrium is reached in about 90 and 120 minutes for both unmodified and neutralized adsorbents, respectively. About 92% the dye was removed by unmodified adsorbent at its equilibrium contact time and optimum dose of 12 g/L, however, only 68% removal efficiency was obtained for neutralized adsorbent at its equilibrium contact time and optimum dose of 15 g/L. The time required to reach equilibrium is independent of initial dye concentrations in the working range of this experiment. For the neutralized adsorbent, the percentage of dye removal is nearly constant in the initial pH range of 4-9, and the maximum removal of the dye was obtained at initial pH of 3. In the case of unmodified adsorbent, maximum removal of the dye was obtained at initial pH of 2. The equilibrium adsorption isotherms have been examined by applying the Langmuir, Freundlich, Dubinin- Rasdushkevich (D-R), and Temkin models. The experimental results can be best described by the D-R isotherm. Adsorption kinetics of was analyzed using the pseudo first and second order models and the regression results showed that the adsorption kinetics were more accurately described by a pseudo second-order model, moreover, the intra-particle diffusion was not the only rate limiting factor of adsorption of the dye. Advisors/Committee Members: Dr. Feleke Zewge (advisor).

Subjects/Keywords: Cibacron brilliant red 3B-A; unmodified and neutralized adsorbents

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Admasu, A. (2008). Adsorptive Removal of Reactive Azo Dyes using Industrial Residue . (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/1169

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Admasu, Adamu. “Adsorptive Removal of Reactive Azo Dyes using Industrial Residue .” 2008. Thesis, Addis Ababa University. Accessed November 17, 2019. http://etd.aau.edu.et/dspace/handle/123456789/1169.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Admasu, Adamu. “Adsorptive Removal of Reactive Azo Dyes using Industrial Residue .” 2008. Web. 17 Nov 2019.

Vancouver:

Admasu A. Adsorptive Removal of Reactive Azo Dyes using Industrial Residue . [Internet] [Thesis]. Addis Ababa University; 2008. [cited 2019 Nov 17]. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1169.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Admasu A. Adsorptive Removal of Reactive Azo Dyes using Industrial Residue . [Thesis]. Addis Ababa University; 2008. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1169

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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