Quick-fix agarose beads impregnated with hydrous ferric oxide for As(III) species removal from pharmaceutical wastewater
| Autor: | Dhanang Edy Pratama, Chia Ling Yang, Yufang Hu, Chun Chou Lin, Yu Ying Chen, Tu Lee |
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| Rok vydání: | 2021 |
| Předmět: |
Chemistry
Manufacturing process Process Chemistry and Technology General Chemical Engineering chemistry.chemical_element Filtration and Separation General Chemistry engineering.material Hydrous ferric oxides chemistry.chemical_compound Adsorption Wastewater Desorption engineering Agarose Effluent Arsenic Nuclear chemistry |
| Zdroj: | Separation Science and Technology. 57:1013-1029 |
| ISSN: | 1520-5754 0149-6395 |
| Popis: | Hydrous ferric oxide (HFO)-impregnated agarose beads were prepared as an adsorbent to reduce As(III) concentration in the pharmaceutical wastewater effluent generated from the manufacturing process of an arsenic-containing chemotherapeutic drug. The adsorbent was prepared by immersing wet agarose beads into FeCl3 (aq), followed by another immersion into NaOH (aq), resulting in HFO precipitation directly within the agarose beads. The As(III) adsorption rate of HFO-impregnated agarose beads was determined to be external diffusion-limited, and having a Langmuir maximum adsorption capacity of 76.1 mg As(III)/g. Passing 6 L of the pharmaceutical wastewater through a packed column filled with the adsorbent in an upflow mode of 50 mL/min repeatedly for five times resulted in the reduction of As(III) concentration from 250 to 10 ��g of As(III)/L of H2O. Column desorption was performed by passing 0.6 L of 0.1 M NaOH (aq) through the column in an upflow mode of 50 mL/min repeatedly for five times to regenerate the As(III)-adsorbed HFO-impregnated agarose beads. Chemical characterizations revealed that the As(III) species were adsorbed on HFO by the ���inner-sphere��� bidentate complexation via ligand exchange or ���outer-sphere��� association via electrostatic interaction, while the ���outer-sphere���-associated As(III) species were most likely desorbed. |
| Databáze: | OpenAIRE |
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