@article { author = {Magadzu, Takalani and Moganedi, Kgabo and Macevele, Lutendo}, title = {Adsorption of Cadmium (II) Ions from Aqueous Solutions using Poly(Amidoamine)/Multi-Walled Carbon Nanotubes Doped Poly(Vinylidene Fluoride-Co-Hexafluoropropene) Composite Membrane}, journal = {Journal of Membrane Science and Research}, volume = {7}, number = {3}, pages = {152-165}, year = {2021}, publisher = {FIMTEC & MPRL}, issn = {2476-5406}, eissn = {2476-5406}, doi = {10.22079/jmsr.2020.121858.1351}, abstract = {Composite membranes consisting of Poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) blended with functionalised multi-walled carbon nanotubes (MWCNTs) and poly-amidoamine (PAMAM) were prepared using a phase inversion technique for adsorptive elimination of Cd (II) ions from contaminated water samples. Upon the addition of PAMAM-MWCNTs on PVDF-HFP, a stable, microporous structure with enhanced surface area and hydrophilic composite membranes were obtained; as confirmed by Focused Ion Beam Scanning Electron Microscopy (FIB-SEM), Fourier transform infrared (FTIR), Thermogravimetric analysis (TGA), Brunauer-Emmett-Teller (BET) analysis and contact angle measurements. The pH, adsorption isotherm, thermodynamic parameters and reusability of the composite membranes were investigated in batch experiments. The maximum adsorption capacity of 1 wt.% PAMAM-MWCNTs/PVDF-HFP composite membrane calculated by Langmuir model was 167 mg/g at 25°C and pH 6.5. All composite membranes demonstrated that the Cd(II) ions adsorption conformed to Freundlich model (R2 = 0.999), which suggests that the adsorption process is multilayer. In addition, the thermodynamic parameters indicated that the adsorption process is spontaneous and endothermic in nature. The adsorption capacity of 1 wt.% PAMAM-MWCNTs/PVDF-HFP composite membrane remained above 90% after four reusability cycles, as confirmed by Inductively coupled plasma-optical emission spectrometry (ICP-OES) analysis. The 1 wt.% PAMAM-MWCNTs/ PVDF-HFP composite membrane exhibited higher selectivity coefficients towards Cd(II) in Cu(II), Zn(II) and Ni(II) binary metal solutions.}, keywords = {PVDF-HFP,Composite membrane,Multi-walled carbon nanotubes,poly-amidoamine,Cd(II) ions,Adsorption capacity}, url = {https://www.msrjournal.com/article_43348.html}, eprint = {https://www.msrjournal.com/article_43348_efc9dab874cf2949cf15623301f79427.pdf} }