Removal of Benzene Compounds by Potassium Ferrate
| Autor: | Kuan-Hsien Ho, 何冠賢 |
|---|---|
| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 Potassium ferrate is a kind of new-type oxidant of water purification; it can remove suspended substance, heavy metal and many kinds of organic pollutants in water effectively. After reacting with pollutants, potassium ferrate will not produce any harmful substance, and it does not have harmful effects to aquatic biological breathing. Potassium ferrate is the integrative multi-functional green water treatment agent that is a kind of collection for oxidization, absorbability, coagulation, disinfection and deodorization. Potassium ferrate can be synthesiz- ed by wet oxidation method; its principle is that in strong base condition, ClO- can oxidize Fe3+ to Fe6+, and then add saturated KOH solution to precipitate solid potassium ferrate, after that the purity of potassium ferrate can be determined by the titration of chromium (III) method. The study was to investigate the removal efficiencies of aniline, m-benzenediamine, and reactive orange-16, reactive black-5 of ADMI and COD by potassium ferrate at different pH, molar ratios and temperature conditions. Results show that the highest removal efficiencies of aniline, m-benzenediamine, reactive black-5 of ADMI occurred at pH=9 and 10. Moreover, the removal efficiency of reactive orange-16 increased with increasing pH, and the removal efficiencies were similar at pH=10 and 11.Besides, the removal efficiencies of benzene compounds increased with increasing initial concentration of potassium ferrate, but the increasing degree of efficiencies were not obvious. The optimum conditions for removing aniline, m-benzenediamine, reactive orange-16 and reactive black-5 of ADMI and COD are shown as follows: (1.) At pH 9~10 and a molar ratio (ferrate: aniline=2:1), ferrate could remove 100% of aniline, and also could remove 58% of COD at pH 10 and a molar ratio (ferrate: aniline=4:1). (2.) At pH 10, ferrate could remove 100% of m-benzenediamine and 48% of COD at respective molar ratios (ferrate: m-benzenediamine =3:1 and 5:1). (3.) At a molar ratio (ferrate: reactive orange-16=5:1), ferrate could remove 98% of ADMI and 27% of COD at pH 10 and 11, respectively. (4.) At a molar ratio (ferrate: reactive black-5=5:1), ferrate could remove 84% of ADMI and 18% of COD at pH 9~11 and 11, respectively. The removal efficiencies of benzene compounds and COD at temperature 15 0C were higher than those at temperature 35 0C. Therefore the oxidation of benzene compounds at low temperature was easier than that at high temperature. Key words: potassium ferrate, wet oxidation method, benzene compounds |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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