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University of Saskatchewan

1. Mahaninia, Mohammad 1983-. Preparation and characterization of cross-linked chitosan beads for phosphate adsorption in aqueous solution.

Degree: 2016, University of Saskatchewan

Chitosan beads were cross-linked with glutaraldehyde (GA) and epichlorohydrin (EP), respectively, at variable composition. The cross-linked chitosan beads were further modified and doped using calcium chloride. Several techniques were used to characterize the structural and chemical properties of chitosan bead materials. These materials possess unique structural and chemical properties such as hydrophile-lipophile characteristics with variable chemical functionalities that affect the adsorption properties. The general features of the adsorption and textural properties of the bead systems were studied using model dye compounds such as p-nitrophenolate (PNP) and phenolphthalein (PHP). The results from the uptake study of the model dyes was used to complement a systematic adsorption study of hydrogen phosphate ion (HPO42-) species and p-nitrophenolate phosphate (PNPP) at pH 8.5 and 295 K. Several model equations were used to analyze the adsorption data, as follows: Langmuir, Sips, and Dubinin–Radushkevich (D-R) isotherms. The Sips model provided adsorption parameters for the chitosan bead systems: (i) the monolayer adsorption capacity (Qm) for PNP ranged from 0.30 to 0.52 mmol g -1, and (ii) the Qm values for the bead systems with HPO42- ranged from 0.22–0.53 mmol g-1, (iii) the Qm values for the bead systems with PNPP ranged from 0.18–1.07 mmol g -1. The kinetic adsorption results for hydrogen phosphate ions (HPO42-) onto chitosan beads was analyzed at variable temperature to obtain the respective thermodynamic adsorption parameters using the pseudo-first order (PFO) and pseudo-second order (PSO) order kinetic models. The experimental rate constants for the bead systems with HPO42- ranged from 0.04–0.11 (min-1) for the PFO model and 0.0021–0.0045g.mg-1.min-1 for the PSO model. A molecular level understanding of the adsorption mechanism for the uptake of phosphate onto chitosan beads was proposed from these experimental results. Bead materials in this research have shown favorable adsorption–desorption properties and represent a promising tunable adsorbent system for the effective removal of phosphate anion species in aqueous solution. Advisors/Committee Members: Wilson, Lee D, Reid, Steve, Scott, Robert, Soltan, Jafar.

Subjects/Keywords: Chitosan bead; Cross-linking; Phosphate; Adsorption

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APA (6th Edition):

Mahaninia, M. 1. (2016). Preparation and characterization of cross-linked chitosan beads for phosphate adsorption in aqueous solution. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7271

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):

Mahaninia, Mohammad 1983-. “Preparation and characterization of cross-linked chitosan beads for phosphate adsorption in aqueous solution.” 2016. Thesis, University of Saskatchewan. Accessed July 20, 2019. http://hdl.handle.net/10388/7271.

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

MLA Handbook (7th Edition):

Mahaninia, Mohammad 1983-. “Preparation and characterization of cross-linked chitosan beads for phosphate adsorption in aqueous solution.” 2016. Web. 20 Jul 2019.

Vancouver:

Mahaninia M1. Preparation and characterization of cross-linked chitosan beads for phosphate adsorption in aqueous solution. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2019 Jul 20]. Available from: http://hdl.handle.net/10388/7271.

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

Council of Science Editors:

Mahaninia M1. Preparation and characterization of cross-linked chitosan beads for phosphate adsorption in aqueous solution. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/7271

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

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