Influence of anion induced proton abstraction on Cu(II) adsorption by alginic acid |
| |
| Affiliation: | 1. Polymer Synthesis and Analysis Laboratory, Department of Chemistry, Faculty of Science and Arts, Canakkale Onsekiz Mart University, 17020 Canakkale, Turkey;2. Department of Bioengineering & Materials Science Engineering, Canakkale Onsekiz Mart University, 17020 Canakkale, Turkey;3. Department of Materials Science & Engineering, Faculty of Engineering, Canakkale Onsekiz Mart University, 17020 Canakkale, Turkey;4. Department of Chemical Engineering, Faculty of Engineering, Canakkale Onsekiz Mart University, 17020 Canakkale, Turkey;1. Nano-Materials Lab, Department of Chemistry, Birla Institute of Technology and Science Pilani, KK Birla Goa Campus, Zuarinagar, Goa 403726, India;2. Departmento de Quimica, Universidade Federal de Santa Maria, 97119-900 Santa Maria, RS, Brazil;2. Department of Chemistry, Federal University of Minas Gerais, Brazil |
| |
| Abstract: | Alginic acid (AA) synthesized by acidification of commercial sodium alginate was investigated for its Cu(II) adsorption efficiency in the presence of different counter ions. The results of batch adsorption studies indicated an adsorption of 169.86 mg/g of Cu(II) by AA in the presence of acetate ions, however, it significantly decreased in the presence of chloride (126.36 mg/g), sulphate (115.24 mg/g) and nitrate (113.28 mg/g) as counter ions. This can be accounted to the tendency of conjugate base (anion) to abstract proton from AA, which determines the extent of deprotonation of carboxylic acid. The FTIR and TGA/DTA studies support the difference in the coordination of carboxylate to Cu(II) in the presence of various counter anions. Acetate showed strong chelate coordination between Cu(II) and AA, whereas in the presence of Cl−, NO3− and SO42 −, Cu(II) was complexed by weak bridging coordination with AA. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
