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Crosslinker-less surface-imprinted Macadamia derived activated carbons for trace Cr(III) removal from aqueous solution
- Lesaoana, Mahadi, Pakade, Vusumzi E., Chimuka, Luke
- Environmental technology & innovation 2019 v.14 pp. 100336
- Fourier transform infrared spectroscopy, Macadamia, acid mine drainage, activated carbon, adsorbents, adsorption, aqueous solutions, carboxylation, chromium, ecosystems, humans, leaching, pH
- Leaching of chromium compounds into the environment from the electroplating process may cause health detrimental effects to humans and ecosystem exposed to these compounds. Ion-imprinted adsorbents possessing high selectivity are required to eradicate trace chromium compounds from complex matrices. A pseudo-surface imprinting technique was applied on carboxylated Macadamia activated carbon (MAC) by grafting MAC with triethylenetetramine, N,N’-diisopropylcarbodiimide and CrCl3⋅6H2O (template ion) to produce MAC-pseudo-ion imprinted adsorbents (MAC-PIIA). MAC-pseudo-non-imprinted adsorbent (MAC-PNIA) counterparts were prepared by the same procedure, but Cr3＋ was excluded in the synthesis. The presence of N–H and C–N bands in FTIR spectra at 3005 and 1232 cm−1, respectively, confirmed successful grafting. The adsorption performance of the MAC-PIIA recorded at pH 5, 120 min, and 3.3 g/L dosage concentration, was 80% (69.61 mg/g). Application of the MAC-PIIA (72.2%) and MAC-PNIA (56.0%) on spiked acid mine drainage artificial sample led to collapse in the removal efficiency. Multilayer Freundlich adsorption described the mechanism.