TY - JOUR
T1 - Mussel-inspired polydopamine functionalized with ionic liquid as a novel, eco-efficient adsorbent for the selective removal of anionic pollutants from aqueous solutions
AU - Abu Alwan, Rawan
AU - Zhuman, Botagoz
AU - Kumar, Mahendra
AU - Arafat, Hassan A.
AU - AlNashef, Inas
N1 - Funding Information:
Authors are thankful to Center for Membranes and Advanced Water Technology (CMAT) at Khalifa University for providing funding and equipment access to perform this study. The financial support by Khalifa University through grant no. CIRA-2018-069 to Professor Inas AlNashef is highly acknowledged.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/2/15
Y1 - 2023/2/15
N2 - In this work, novel mussel-inspired polydopamine nanoparticles functionalized with ionic liquid (PDA-IL) were synthesized via one step oxidative polymerization and Schiff-base addition reaction using dopamine and ionic liquid (3-aminopropylammonium acetate). The synthesized polydopamine-ionic liquid (PDA-IL) was utilized as an efficient adsorbent in the removal of anionic dyes from aqueous solutions, using Alizarin Red S (ARS) as a model pollutant. Multiple analytical tools, including scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy and Zeta potential were applied in the characterizations of PDA-IL. A parametric study was conducted to examine the effects of pH, contact time, initial concentration, adsorbent dose, and temperature on PDA-IL adsorption performance. Characterization results confirmed the formation of nano-sized PDA-IL particles with polycrystalline structure. Additionally, the porous structure, surface charge, surface moieties and thermal stability were progressively tuned along with the introduction of the custom-synthesized IL within the matrix of PDA. Results showed a significant maximum ARS adsorption capacity of PDA-IL, up to 234.2 mg g−1 at 25 °C. Adsorption kinetics data revealed a pseudo-second-order kinetics, governed by chemisorption. Equilibrium data for ARS removal were in agreement with Freundlich isotherm, indicating multilayer adsorption on the heterogeneous PDA-IL surface. Furthermore, regeneration studies demonstrated an efficient re-use of PDA-IL adsorbent in at least 4 adsorption/desorption cycles. A selectivity study was also conducted, which showed that PDA-IL selectivity towards anionic dyes can be tuned via pH control. Finally, an adsorption mechanism was proposed, based on FTIR and electron energy loss spectroscopy (EELS) mapping results, among others, for an understanding of the underlying adsorption phenomena on PDA-IL. Overall, the developed PDA-IL adsorbent had a great removal capacity of anionic ARS dye, fast adsorption kinetics, excellent selectivity towards anionic dyes and high regeneration efficiency.
AB - In this work, novel mussel-inspired polydopamine nanoparticles functionalized with ionic liquid (PDA-IL) were synthesized via one step oxidative polymerization and Schiff-base addition reaction using dopamine and ionic liquid (3-aminopropylammonium acetate). The synthesized polydopamine-ionic liquid (PDA-IL) was utilized as an efficient adsorbent in the removal of anionic dyes from aqueous solutions, using Alizarin Red S (ARS) as a model pollutant. Multiple analytical tools, including scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy and Zeta potential were applied in the characterizations of PDA-IL. A parametric study was conducted to examine the effects of pH, contact time, initial concentration, adsorbent dose, and temperature on PDA-IL adsorption performance. Characterization results confirmed the formation of nano-sized PDA-IL particles with polycrystalline structure. Additionally, the porous structure, surface charge, surface moieties and thermal stability were progressively tuned along with the introduction of the custom-synthesized IL within the matrix of PDA. Results showed a significant maximum ARS adsorption capacity of PDA-IL, up to 234.2 mg g−1 at 25 °C. Adsorption kinetics data revealed a pseudo-second-order kinetics, governed by chemisorption. Equilibrium data for ARS removal were in agreement with Freundlich isotherm, indicating multilayer adsorption on the heterogeneous PDA-IL surface. Furthermore, regeneration studies demonstrated an efficient re-use of PDA-IL adsorbent in at least 4 adsorption/desorption cycles. A selectivity study was also conducted, which showed that PDA-IL selectivity towards anionic dyes can be tuned via pH control. Finally, an adsorption mechanism was proposed, based on FTIR and electron energy loss spectroscopy (EELS) mapping results, among others, for an understanding of the underlying adsorption phenomena on PDA-IL. Overall, the developed PDA-IL adsorbent had a great removal capacity of anionic ARS dye, fast adsorption kinetics, excellent selectivity towards anionic dyes and high regeneration efficiency.
KW - Adsorption
KW - Anionic pollutants
KW - Eco-efficient material
KW - Ionic liquid
KW - Polydopamine
KW - Water treatment
UR - http://www.scopus.com/inward/record.url?scp=85142680621&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.140498
DO - 10.1016/j.cej.2022.140498
M3 - Article
AN - SCOPUS:85142680621
SN - 1385-8947
VL - 454
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 140498
ER -
