Fabrication of magnetic carboxyl-functionalized attapulgite/calcium alginate beads for lead ion removal from aqueous solutions
| Autor: | Xiang ying Chen, Nan Nan Ding, Meng ying Chen, Xia jie Lin, Ming feng Zou, Li-Ye Yang, Xiao-kun Ouyang |
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| Rok vydání: | 2018 |
| Předmět: |
Calcium alginate
Alginates Metal ions in aqueous solution Composite number Kinetics Magnesium Compounds 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry Water Purification chemistry.chemical_compound symbols.namesake Magnetics Adsorption Structural Biology medicine Humans Molecular Biology Aqueous solution Silicon Compounds Langmuir adsorption model Palygorskite Water General Medicine Carbon Dioxide 021001 nanoscience & nanotechnology 0104 chemical sciences Solutions chemistry Lead symbols 0210 nano-technology Water Pollutants Chemical Nuclear chemistry medicine.drug |
| Zdroj: | International journal of biological macromolecules. 120 |
| ISSN: | 1879-0003 |
| Popis: | In the present study, we synthesized an effective Pb(II) adsorbent from magnetic carboxyl-functionalized attapulgite (McAPT) and sodium alginate (Alg) by simple mechanical agitation at room temperature. The novel McAPT@Alg composite was systematically characterized using a number of instrumental techniques, and the effects of adsorbent dosage, initial concentration of Pb(II), adsorption time, pH, and temperature on the adsorption capacity were investigated by performing batch experiments. The obtained results demonstrated that adsorption equilibrium could be reached within 1.5 h, with the maximum adsorption capacity being 471.20 mg g−1 while the temperature was 297.2 K. The experimental data were suitable for application to the Langmuir isotherm model, and the adsorption kinetics agreed with the pseudo-second-order model. More importantly, a Pb(II) removal efficiency of >70% could be achieved after 6× adsorbent recycling, which demonstrated the excellent potential of McAPT@Alg for removing Pb(II) from contaminated water. |
| Databáze: | OpenAIRE |
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