Removal of heavy metals from water using multistage functionalized multiwall carbon nanotubes

Dragoslav Budimirović, Zlate Veličković, Zoran Bajić, Dragana Milošević, Jasmina Nikolić, Saša Drmanić, Aleksandar Marinković

Abstract


The multistage synthesis of the multi-wall carbon nanotubes (MWCNT) modified with polyamidoamine dendrimers, A1/ and A2/MWCNT, capable of cation removal was presented in this work. Furthermore, a novel adsorbents based on these precursor materials and modified with goethite nano-deposit, α-FeOOH, produced 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 modeling, by using Langmuir isotherm, revealed good adsorption capacities of 18.8 mg g–1 for As(V), 60.1 and 44.2 mg g–1 for Pb2+ and Cd2+ on A2/MWCNT, respectively. Moreover, 25.2 and 27.2 mg g–1 of As(V) removal on A1/ and A2/MWCNT-α-FeO(OH) were obtained, respectively. Thermodynamic parameters showed that the adsorption were 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 highest effect of phosphate on 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): 8.85 kJ mol-1 for Cd2+, 9.25 kJ mol-1 for Pb2+ and 7.98 kJ mol-1 for As(V), were obtained from kinetic data.

Keywords


Arsenic; cadmium; lead; adsorption; nanocomposites; MWCNT; goethite

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DOI: http://dx.doi.org/10.2298/JSC170422066B

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