Removal of heavy metals from water using multistage functionalized multiwall carbon nanotubes
| Autor: | Zoran Bajić, B Jasmina Nikolic, Dragoslav Budimirovic, S Zlate Velickovic, D Aleksandar Marinkovic, Z Sasa Drmanic, L Dragana Milosevic |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Goethite
cadmium Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences lcsh:Chemistry symbols.namesake chemistry.chemical_compound Adsorption nanocomposites Humic acid goethite Arsenic chemistry.chemical_classification lead Chromate conversion coating MWCNT Arsenate arsenic Langmuir adsorption model General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry lcsh:QD1-999 adsorption visual_art symbols visual_art.visual_art_medium 0210 nano-technology Fluoride |
| Zdroj: | Journal of the Serbian Chemical Society, Vol 82, Iss 10, Pp 1175-1191 (2017) Journal of the Serbian Chemical Society |
| ISSN: | 1820-7421 0352-5139 |
| Popis: | The multistage synthesis of the multi-wall carbon nanotubes (MWCNT) modified with polyamidoamine dendrimers, A1/ and A2/MWCNT, capable of cation removal, is presented in this work, as well as novel adsorbents based on these precursor materials and modified with goethite nano-deposit, α-FeOOH, A1/ and A2/MWCNT–α-FeO(OH) adsorbents used for As(V) removal. In a batch test, the influence of pH, contact time, initial ion concentration and temperature on adsorption efficiency were studied. Adsorption data modelling by the Langmuir isotherm, revealed good adsorption capacities (in mg g-1) of 18.8 for As(V) and 60.1 and 44.2 for Pb2+ and Cd2+ on A2/MWCNT, respectively. Also, 27.6 and 29.8 mg g-1 of As(V) on A1/ and A2/MWCNT–α-FeO(OH), respectively, were removed. Thermodynamic parameters showed that the adsorption is spontaneous and endothermic processes. Results of the study of influences of competitive ions: bicarbonate, sulfate, phosphate, silicate, chromate, fluoride and natural organic matter (NOM), i.e., humic acid (HA), showed the highest effect of phosphate on the decrease of arsenate adsorption. Time-dependent adsorption was best described by pseudo-second-order kinetic model and Weber–Morris model which predicted intra-particle diffusion as a rate-controlling step. Also, activation energy (Ea / kJ mol-1): 8.85 for Cd2+, 9.25 for Pb2+ and 7.98 for As(V), were obtained from kinetic data. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III45019 and Grant no. OI 172057] |
| Databáze: | OpenAIRE |
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