Cadmium ion adsorption by amine-modified activated carbon
| Autor: | Acong Chen, Jie Xu, Xin Xin, Yu Bian, Zhaoyong Bian |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Geologic Sediments
Environmental Engineering Central composite design Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Adsorption medicine Amines 0105 earth and related environmental sciences Water Science and Technology Aqueous solution Temperature Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Silanol chemistry Charcoal Surface modification Amine gas treating 0210 nano-technology Carbon Water Pollutants Chemical Cadmium Activated carbon medicine.drug |
| Zdroj: | Water Science and Technology. 75:1675-1683 |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2017.042 |
| Popis: | Cadmium (Cd) is one of the most toxic metals found in water and sediments. In the effort to develop an effective adsorbent for aqueous Cd removal, activated carbon (AC) was modified with an amino-terminated organosilicon (3-aminopropyltrimethoxysilane, APS). Response surface methodology was used to optimize selected operational parameters of adsorption of aqueous Cd by considering a central composite design with three input variables, temperature of the mixture solution, the contact time and feed ratio (APS/AC), on the surface modification. Results demonstrated that the strong Cd-binding amine ligands were effectively introduced onto the AC surfaces through the silanol reaction between carbon surface functional groups (–COOH, –COH) and APS molecules. The optimized preparation condition is 77 °C, 4 h and 2.1 ratio. The adsorbent presented a favorable adsorption of the aqueous Cd(II). |
| Databáze: | OpenAIRE |
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