Characterization of decrystallized chitosan from shrimp shell and its applications | |
| Author | Nguyen Minh Xuan Hong |
| Call Number | AIT Thesis no.BT-03-14 |
| Subject(s) | Chitosan Sewage--Purification |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. BT-03-14 |
| Abstract | Decrystallized shrimp chitosans were prepared by treatment with sulfuric acid. The treated chitosans had a low degree of crystallinity and a high anionic dye binding capacity. Raw mixed dye wastewater from a textile factory was efficiently decolorized using decrystallized chitosan that appeared to be more efficient than using normal chitosan and activated carbon. Decolorization reached 90 % within 10 min, and can be carried out over a pH range from 4.5 to 8.1. Sulfuric decrystallized chitosans after dye adsorption can be regenerated by 2 M H2S04 and can be reused more than 10 times. It is an attractive candidate for the removal of dyes from textile wastewater. The sulfuric acid treatment was further investigated whether it can be used as a method to reinforce chitosan and chitosan membrane in order for use in acidic conditions. The treated chitosan samples in acidic conditions were highly stable even at very low pH. During 24 h of immersion in acidic solution of pH 1, only 7 % of the chitosan membrane material dissolved while total dissolution (100 %) was observed for normal chitosan. This result suggests that the crosslinking between chitosan and sulfate groups generates crosslinked chitosan that is stable in low pH condition. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. BT-03-14 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Food Engineering and Bioprocess Technology (FB) |
| Chairperson(s) | Stevens, Willem F.; |
| Examination Committee(s) | Suwalee Chandrkrachang;Nguyen Thi Kim Oanh; |
| Scholarship Donor(s) | Government of Netherlands; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2003 |