An innovative pH-independent magnetically separable hydrogel for the removal of Cu(II) and Ni(II) ions from electroplating wastewater

Ahmed, 2015, Hydrogel: preparation, characterization, and applications: a review, J. Adv. Res., 6, 105, 10.1016/j.jare.2013.07.006

Aliahmad, 2013, Synthesis of maghemite (γ-Fe2O3) nanoparticles by thermal-decomposition of magnetite (Fe3O4) nanoparticles, J. Biomater. Sci. Polym. Ed., 31, 264

Al-Shannag, 2015, Heavy metal ions removal from metal plating wastewater using electrocoagulation: kinetic study and process performance, Chem. Eng. J., 260, 749, 10.1016/j.cej.2014.09.035

Arshadi, 2014, Kinetic, equilibrium and thermodynamic investigations of Ni(II), Cd(II), Cu(II) and Co(II) adsorption on barley straw ash, Water Resour. Ind., 6, 1, 10.1016/j.wri.2014.06.001

ATSDR (Agency for Toxic Substances and Disease Registry), 2005

Atta, 2012, Application of anionic acrylamide-based hydrogels in the removal of heavy metals from waste water, J. Appl. Polym. Sci., 123, 2500, 10.1002/app.34798

Blanchard, 1984, Removal of heavy metals from waters by means of natural zeolites, Water Res., 18, 1501, 10.1016/0043-1354(84)90124-6

Cheng, 2015, High-performance supercapacitor applications of NiO-nanoparticle-decorated millimeter-long vertically aligned carbon nanotube arrays via an effective supercritical CO2-assisted method, Adv. Funct. Mater., 25, 7381, 10.1002/adfm.201502711

Freundlich, 1906, About adsorption in solutions, J. Phys. Chem., 57, 385

Hou, 2010, Formation of highly stable dispersions of silane-functionalized reduced graphene oxide, Chem. Phys. Lett., 501, 68, 10.1016/j.cplett.2010.10.051

Hu, 2006, Selective removal of heavy metals from industrial wastewater using maghemite nanoparticle: performance and mechanisms, J. Environ. Eng. New York (New York), 132, 709

Javaid, 2011, Removal of heavy metals by adsorption on Pleurotus ostreatus, Biomass Bioenergy, 35, 1675, 10.1016/j.biombioe.2010.12.035

Jiang, 2014, Spherical polystyrene-supported chitosan thin film of fast kinetics and high capacity for copper removal, J. Hazard. Mater., 276, 295, 10.1016/j.jhazmat.2014.05.032

John, 2009

Kang, 1996, Synthesis and characterization of nanometer-size Fe3O4 and γ-Fe2O3 particles, Chem. Mater., 8, 2209, 10.1021/cm960157j

Kaşgöz, 2008, Enhanced swelling and adsorption properties of AAm‐AMPSNa/clay hydrogel nanocomposites for heavy metal ion removal, Polym. Adv. Technol., 19, 213, 10.1002/pat.999

Khan, 2017, Removal of ionizable aromatic pollutants from contaminated water using nano γ-Fe2O3 based magnetic cationic hydrogel: sorptive performance, magnetic separation and reusability, J. Hazard. Mater., 322, 195, 10.1016/j.jhazmat.2016.01.051

Kleinübing, 2010, Characterization and evaluation of copper and nickel biosorption on acidic algae Sargassum filipendula, Mater. Res., 13, 541, 10.1590/S1516-14392010000400018

Kumar, 2018, Development of g-C3N4/TiO2Fe3O4@SiO2 heterojunction via sol-gel route: a magnetically recyclable direct contact Z-scheme nanophotocatalyst for enhanced photocatalytic removal of ibuprofen from real sewage effluent under visible light, Chem. Eng. J., 353, 645, 10.1016/j.cej.2018.07.153

Langmuir, 1918, The adsorption of gases on plane surfaces of glass, mica and platinum, J. Am. Chem. Soc., 40, 1361, 10.1021/ja02242a004

Li, 2018, Efficient removal of nickel(II) from high salinity wastewater by a novel PAA/ZIF-8/PVDF hybrid ultrafiltration membrane, Water Res., 143, 87, 10.1016/j.watres.2018.06.031

Limparyoon, 2011, Acrylamide/2-acrylamido-2-methylpropane sulfonic acid and associated sodium salt superabsorbent copolymer nanocomposites with mica as fire retardants, Polym. Degrad. Stab., 96, 1054, 10.1016/j.polymdegradstab.2011.03.012

Lin, 2011, Hydrogen generation using a CuO/ZnO-ZrO2 nanocatalyst for autothermal reforming of methanol in a microchannel reactor, Molecules., 16, 348, 10.3390/molecules16010348

Lo, 2011, Combining material characterization with single and multi-oxyanion adsorption for mechanistic study of chromate removal by cationic hydrogel, J. Environ. Sci. China (China), 23, 1004, 10.1016/S1001-0742(10)60507-4

Machado, 2010, Removal of chromium, copper, and nickel from an electroplating effluent using a flocculent brewer’s yeast strain of Saccharomyces cerevisiae, Water Air Soil Pollut., 212, 199, 10.1007/s11270-010-0332-1

Mahmoud, 2013, Adsorption of copper(II), lead(II), and cadmium(II) ions from aqueous solution by using hydrogel with magnetic properties, Monatsh. Chem., 144, 1097, 10.1007/s00706-013-0957-z

Mukhopadhyay, 2007, Hydro-geochemical controls on removal of Cr(VI) from contaminated groundwater by anion exchange, Appl. Geochem., 22, 370, 10.1016/j.apgeochem.2006.09.009

Onundi, 2010, Adsorption of copper, nickel and lead ions from synthetic semiconductor industrial wastewater by palm shell activated carbon, Int. J. Environ. Sci. Technol. (Tehran), 7, 751, 10.1007/BF03326184

Ozay, 2010, Utilization of magnetic hydrogels in the separation of toxic metal ions from aqueous environments, Desalination., 260, 57, 10.1016/j.desal.2010.04.067

Ozay, 2009, Removal of toxic metal ions with magnetic hydrogels, Water Res., 43, 4403, 10.1016/j.watres.2009.06.058

Paulino, 2006, Novel adsorbent based on silkworm chrysalides for removal of heavy metals from wastewaters, J. Colloid Interface Sci., 301, 479, 10.1016/j.jcis.2006.05.032

Peng, 2015, Amino-functionalized adsorbent prepared by means of Cu(II) imprinted method and its selective removal of copper from aqueous solutions, J. Hazard. Mater., 294, 9, 10.1016/j.jhazmat.2015.03.046

Plazinski, 2009, Theoretical models of sorption kinetics including a surface reaction mechanism: a review, Adv. Colloid Interface Sci., 152, 2, 10.1016/j.cis.2009.07.009

Ratcliff, 2011, Evidence for near-surface NiOOH species in solution-processed NiOx selective interlayer materials: impact on energetics and the performance of polymer bulk heterojunction photovoltaics, Chem. Mater., 23, 4988, 10.1021/cm202296p

Rotello, 2004

Silverstein, 1981

Souda, 2015, Magnetic hydrogel for better adsorption of heavy metals from aqueous solutions, J. Environ. Chem. Eng., 3, 1882, 10.1016/j.jece.2015.03.007

Suganthi, 2017, A novel single step synthesis and surface functionalization of iron oxide magnetic nanoparticles and thereof for the copper removal from pigment industry effluent, Sep. Purif. Technol., 188, 458, 10.1016/j.seppur.2017.07.059

Tanveer, 2014, Effect of the morphology of CuS upon the photocatalytic degradation of organic dyes, RSC Adv., 4, 63447, 10.1039/C4RA04940C

Torres, 2009

Wang, 2018, Anionic polypeptide poly(Γ-glutamic acid)-functionalized magnetic Fe3O4-GO-(o-MWCNTs) hybrid nanocomposite for high-efficiency removal of Cd(II), Cu(II) and Ni(II) heavy metal ions, Chem. Eng. J., 346, 38, 10.1016/j.cej.2018.03.084

World Health Organization, 2017

Zhang, 2018, Malic acid-enhanced chitosan hydrogel beads (mCHBs) for the removal of Cr(VI) and Cu(II) from aqueous solution, Chem. Eng. J., 353, 225, 10.1016/j.cej.2018.06.143

Zhang, 2009, Iron-based magnetic nanoparticles for removal of heavy metals from electroplating and metal-finishing wastewater, 213