Hydrogels derived from 2-hydroxyethyl-methacrylate and 2-acrylamido-2-methyl-1-propanesulfonic acid, with ability to remove metal cations from wastewater
- 43 Downloads
Synthesis, characterization, and study of the cation adsorption properties of four hydrogels are presented. The hydrogels were synthesized via radical copolymerization of a 1:1 mixture of 2-hydroxyethyl-methacrylate and 2-acrylamido-2-methyl-1-propanesulfonic acid, with different initiators and cross-linking reagents. HM1 hydrogel was obtained by adding only ammonium persulfate; HM2 hydrogel was synthesized using a redox initiator solution containing ammonium persulfate and sodium metabisulfite at room temperature. For HM3 hydrogel the initiator benzoyl peroxide and the cross-linking reagent ethylene glycol dimethacrylate were used. Finally, for HM4 hydrogel the polymerization was carried out using ammonium persulfate as initiator and poly(ethylene glycol) diglycidyl ether as cross-linking reagent. The sorption properties were analyzed by pH, contact time, maximum sorption capacity, and selectivity studies. The HM2 and HM3 hydrogels exhibited good ion sorption properties. These copolymers were capable of interacting and removing Cd(II), Cu(II), Pb(II), Ni(II), and Zn(II) ions from synthetic solutions and with real samples from mining wastewaters. The results obtained from the studies of maximum sorption capacity at different concentrations showed that the HM2 hydrogel was capable of adsorbing 226 mg/g Cd(II), 241 mg/g Pb(II), 166 mg/g Cu(II), 161 mg/g Zn(II), and 110 mg/g Ni(II) and the HM3 hydrogel was capable of adsorbing 184 mg/g Ni(II), 172 mg/g Cd(II), 126 mg/g Zn(II), 90 mg/g Pb(II), and 39 mg/g Cu(II). The experimental data were correlated with the Langmuir and Freundlich isotherm models. Thermodynamic parameters such as enthalpy (ΔH°), Gibbs free energy (ΔG°), and entropy (ΔS°) changes were obtained. The sorption kinetics were analyzed using Lagergren pseudo-second-order equation.
KeywordsHydrogels Cross-linking Metal cations adsorption Wastewater treatment
The authors are grateful for the PAI (Grant No. 781301006), FONDECYT (Grant No. 1150510), CIPA, CONICYT Regional, GORE BIO BIO, R17A10003, and the scholarship given to Aritz Mancisidor by the Global Training Internationalization Programme from the Basque Government, Spain. The authors thank the Center for Water Resources for Agriculture and Mining, University of Concepción, Chile, for supplying real water sample.
- 3.Çavuş S, Yaşar G, Kaya Y, Gönder ZB, Gürdağ G, Vergili I (2016) Synthesis and characterization of gel beads based on ethyleneglycoldimethacrylate and 2-acrylamido-2-methyl-1-propane sulfonic acid: removal of Fe(II), Cu(II), Zn(II), and Ni(II) from metal finishing wastewater. Process Saf Environ 103:227–236. https://doi.org/10.1016/j.psep.2016.07.011 CrossRefGoogle Scholar
- 8.Rivas BL, Pereira ED, Palencia M, Sánchez J (2011) Water-soluble functional polymers in conjunction with membranes to remove pollutant ions from aqueous solutions. Progr Polym Sci 36:294–322. https://doi.org/10.1016/j.progpolymsci.2010.11.001 CrossRefGoogle Scholar
- 14.Fang R, He W, Xue H, Chen W (2016) Synthesis and characterization of a high capacity cationic hydrogel adsorbent and its application in the removal of Acid Black 1 from aqueous solution. React Funct Polym 102:1–10. https://doi.org/10.1016/j.reactfunctpolym.2016.02.013 CrossRefGoogle Scholar
- 19.Gupta VK, Tyagi I, Agarwal S, Sadegh H, Shahryari-ghoshekandi R, Yari M, Yousefi-nejat O (2015) Experimental study of surfaces of hydrogel polymers HEMA, HEMA-EEMA-MA, and PVA as adsorbent for removal of azo dyes from liquid phase. J Mol Liq 206:129–136. https://doi.org/10.1016/j.molliq.2015.02.015 CrossRefGoogle Scholar
- 22.Su E, Okay O (2018) Hybrid cross-linked poly(2-acrylamido-2-methyl-1-propanesulfonic acid) hydrogels with tunable viscoelastic, mechanical and self-healing properties. React Funct Polym 123:70–79. https://doi.org/10.1016/j.reactfunctpolym.2017.12.009 CrossRefGoogle Scholar
- 24.Yang C, Liu Z, Chen C, Shi K, Zhang L, Ju X-J, Wang W, Xie R, Chu LY (2017) Reduced graphene oxide-containing smart hydrogels with excellent electro-response and mechanical properties for soft actuators. ACS Appl Mater Interfaces 9:15758–15767. https://doi.org/10.1021/acsami.7b01710 CrossRefGoogle Scholar
- 33.Rivas BL, Maureira A, Guzmán C, Mondaca MA (2009) Poly(2-acrylamido glycolic acid-co-2-acrylamido-2-methyl-1-propane sulfonic acid): synthesis, characterization, and retention properties for environmentally impacting metal ions. J Appl Polym Sci 111:78–86. https://doi.org/10.1002/app.29019 CrossRefGoogle Scholar
- 34.Kono H, Ogasawara K, Kusumoto R, Oshima K, Hashimoto H, Shimizu Y (2016) Cationic cellulose hydrogels cross-linked by poly(ethylene glycol): preparation, molecular dynamics, and adsorption of anionic dyes. Carbohydr Polym 152:170–180. https://doi.org/10.1016/j.carbpol.2016.07.011 CrossRefGoogle Scholar
- 35.Cuizano NA, Reyes ÚF, Domínguez S, Llanos BP, Navarro AE (2010) Relevancia del pH en la adsorción de iones metálicos mediante algas pardas. Revista de la Sociedad Química del Perú 76:123–130Google Scholar
- 37.Lin L-C, Thirumavalavan M, Wang Y-T, Lee J-F (2010) Effect of preparation conditions on the adsorption of heavy metal ions from aqueous solution by mesoporous silica materials prepared using organic template (HDTMAB). J Chem Eng Data 55:3667–3673. https://doi.org/10.1021/je1002253 CrossRefGoogle Scholar
- 41.Okeola FO, Odebunmi EO (2010) Comparison of Freundlich and Langmuir isoterms for adsorption of Methylene Blue by agrowaste derived activated carbon. Adv Environ Biol 4:329–335Google Scholar