1. A.J. Bora, R.K. Dutta, Removal of metals (Pb, Cd, Cu, Cr, Ni, and Co) from drinking water by oxidation-coagulation-absorption at optimized pH, J. Water Process Eng., 31 (2019) 100839.
  2. F. Fu, Q. Wang, Removal of heavy metal ions from wastewaters: a review, J. Environ. Manage., 92 (2011) 407–418.
  3. C.F. Carolin, P.S. Kumar, A. Saravanan, G.J. Joshiba, M. Naushad, Efficient techniques for the removal of toxic heavy metals from aquatic environment: a review, J. Environ. Chem. Eng., 5 (2017) 2782–2799.
  4. A. Selimović, H. Junuzović, S. Begić, R. Cvrk, Efficiency of precipitation and removal of Pb(II) and Zn(II) ions from their monocomponent and two-component aqueous solutions using Na2CO3, Lect. Notes Networks Syst., 76 (2020) 569–575.
  5. X. Li, Q. Zhang, B. Yang, Co-precipitation with CaCO3 to remove heavy metals and significantly reduce the moisture content of filter residue, Chemosphere, 239 (2020) 124660.
  6. E. Jashni, S.M. Hosseini, Promoting the electrochemical and separation properties of heterogeneous cation exchange membrane by embedding 8-hydroxyquinoline ligand: chromium ions removal, Sep. Purif. Technol., 234 (2020) 116118.
  7. Q. Chen, Z. Tang, H. Li, M. Wu, Q. Zhao, B. Pan, An electronscale comparative study on the adsorption of six divalent heavy metal cations on MnFe2O4@CAC hybrid: experimental and DFT investigations, Chem. Eng. J., 381 (2020) 122656.
  8. F. Wu, T. Zhao, Y. Yao, T. Jiang, B. Wang, M. Wang, Recycling supercapacitor activated carbons for adsorption of silver(I) and chromium(VI) ions from aqueous solutions, Chemosphere, 238 (2020) 124638.
  9. X. Liu, B. Jiang, X. Yin, H. Ma, B.S. Hsiao, Highly permeable nanofibrous composite microfiltration membranes for removal of nanoparticles and heavy metal ions, Sep. Purif. Technol., 233 (2020) 115976.
  10. X. Su, A. Kushima, C. Halliday, J. Zhou, J. Li, T.A. Hatton, Electrochemically-mediated selective capture of heavy metal chromium and arsenic oxyanions from water, Nat. Commun., 9 (2018) 4701.
  11. L.A. Malik, A. Bashir, A. Qureashi, A.H. Pandith, Detection and removal of heavy metal ions: a review, Environ. Chem. Lett., 17 (2019) 1495–1521.
  12. A.E. Burakov, E.V. Galunin, I.V. Burakova, A.E. Kucherova, S. Agarwal, A.G. Tkachev, V.K. Gupta, Adsorption of heavy metals on conventional and nanostructured materials for wastewater treatment purposes: a review, Ecotoxicol. Environ. Saf., 148 (2018) 702–712.
  13. M. Naushad, Z.A. Alothman, Separation of toxic Pb2+ metal from aqueous solution using strongly acidic cation-exchange resin: analytical applications for the removal of metal ions from pharmaceutical formulation, Desal. Water Treat., 53 (2015) 2158–2166.
  14. H. Esmaeili, R. Foroutan, Investigation into ion exchange and adsorption methods for removing heavy metals from aqueous solutions, Int. J. Biol. Pharm. Allied Sci., 4 (2015) 620–629.
  15. J. Beltrán Heredia, J. Sánchez Martín, Removing heavy metals from polluted surface water with a tannin-based flocculant agent, J. Hazard. Mater., 165 (2009) 1215–1218.
  16. D.S. Patil, S.M. Chavan, J.U.K. Oubagaranadin, A review of technologies for manganese removal from wastewaters, J. Environ. Chem. Eng., 4 (2016) 468–487.
  17. A.A.H. Faisal, S.F.A. Al-Wakel, H.A. Assi, L.A. Naji, M. Naushad, Waterworks sludge-filter sand permeable reactive barrier for removal of toxic lead ions from contaminated groundwater, J. Water Process Eng., 33 (2020) 101112.
  18. S. Wadhawan, A. Jain, J. Nayyar, S.K. Mehta, Role of nanomaterials as adsorbents in heavy metal ion removal from waste water: a review, J. Water Process Eng., 33 (2020) 101038.
  19. N. Gupta, P. Pant, C. Gupta, P. Goel, A. Jain, S. Anand, A. Pundir, Engineered magnetic nanoparticles as efficient sorbents for wastewater treatment: a review, Mater. Res. Innovations, 22 (2018) 434–450.
  20. A. Şen, H. Pereira, M.A. Olivella, I. Villaescusa, Heavy metals removal in aqueous environments using bark as a biosorbent, Int. J. Environ. Sci. Technol., 12 (2015) 391–404.
  21. M. Shafiq, A.A. Alazba, M.T. Amin, Removal of heavy metals from wastewater using date palm as a biosorbent: a comparative review, Sains Malaysiana, 47 (2018) 35–49.
  22. G.K. Sarma, S. Sen Gupta, K.G. Bhattacharyya, Nanomaterials as versatile adsorbents for heavy metal ions in water: a review, Environ. Sci. Pollut. Res., 26 (2019) 6245–6278.
  23. Y. Wu, H. Pang, Y. Liu, X. Wang, S. Yu, D. Fu, J. Chen, X. Wang, Environmental remediation of heavy metal ions by novel nanomaterials: a review, Environ. Pollut., 246 (2019) 608–620.
  24. S. Tamjidi, H. Esmaeili, B. Kamyab Moghadas, Application of magnetic adsorbents for removal of heavy metals from wastewater: a review study, Mater. Res. Express, 6 (2019) 102004.
  25. F. Liu, K. Zhou, Q. Chen, A. Wang, W. Chen, Application of magnetic ferrite nanoparticles for removal of Cu(II) from copper-ammonia wastewater, J. Alloys Compd., 773 (2019) 140–149.
  26. N.A. Yazid, Y.C. Joon, Co-precipitation synthesis of magnetic nanoparticles for efficient removal of heavy metal from synthetic wastewater, AIP Conf. Proc., 2124 (2019) 1–10.
  27. Y. Huang, A.A. Keller, EDTA functionalized magnetic nanoparticle sorbents for cadmium and lead contaminated water treatment, Water Res., 80 (2015) 159–168.
  28. K. Kombaiah, J.J. Vijaya, L.J. Kennedy, M. Bououdina, R.J. Ramalingam, H.A. Al-Lohedan, Okra extract-assisted green synthesis of CoFe2O4 nanoparticles and their optical, magnetic, and antimicrobial properties, Mater. Chem. Phys., 204 (2018) 410–419.
  29. Y. Zhang, T. Yan, L. Yan, X. Guo, L. Cui, Q. Wei, B. Du, Preparation of novel cobalt ferrite/chitosan grafted with graphene composite as effective adsorbents for mercury ions, J. Mol. Liq., 198 (2014) 381–387.
  30. R. Bhateria, R. Singh, A review on nanotechnological application of magnetic iron oxides for heavy metal removal, J. Water Process Eng., 31 (2019) 100845.
  31. F. Almomani, R. Bhosale, M. Khraisheh, A. Kumar, T. Almomani, Heavy metal ions removal from industrial wastewater using magnetic nanoparticles (MNP), Appl. Surf. Sci., 506 (2020) 144924.
  32. H. Waqas, A.H. Qureshi, K. Subhan, M. Shahzad, Nanograin Mn-Zn ferrite smart cores to miniaturize electronic devices, Ceram. Int., 38 (2012) 1235–1240.
  33. M.A. Gabal, S.S. Ata-Allah, Effect of diamagnetic substitution on the structural, electrical and magnetic properties of CoFe2O4, Mater. Chem. Phys., 85 (2004) 104–112.
  34. L.B. Tahar, H. Basti, F. Herbst, L.S. Smiri, J.P. Quisefit, N. Yaacoub, J.M. Greneche, S. Ammar, Co1-xZnxFe2O4 (0 ≤ x ≤ 1) nanocrystalline solid solution prepared by the polyol method: characterization and magnetic properties, Mater. Res. Bull., 47 (2012) 2590–2598.
  35. L. Zhuang, W. Zhang, Y. Zhao, D. Li, W. Wu, H. Shen, Temperature sensitive ferrofluid composed of Mn1–xZnxFe2O4 nanoparticles prepared by a modified hydrothermal process, Powder Technol., 217 (2012) 46–49.
  36. H.N. Choi, K.S. Baek, S.W. Hyun, I.B. Shim, C.S. Kim, A study of Co substituted Mn-Ferrite, Mn1–xCoxFe2O4(x = 0.0,0.5,1.), IEEE Trans. Magn., 45 (2009) 2554–2556.
  37. L. Zhou, H.B. Wu, T. Zhua, X.W. Lou, Facile preparation of ZnMn2O4 hollow microspheres as high-capacity anodes for lithium-ion batteries, J. Mater. Chem., 22 (2011) 827–829.
  38. N. Somaiah, T.V. Jayaraman, P.A. Joy, D. Das, Magnetic and magnetoelastic properties of Zn-doped cobalt-ferrites—CoFe2−xZnxO4 (x = 0, 0.1, 0.2, and 0.3), J. Magn. Magn. Mater., 324 (2012) 2286–2291.
  39. A.M. Cojocariu, M. Soroceanu, L. Hrib, V. Nica, O.F. Caltun, Microstructure and magnetic properties of substituted (Cr, Mn) - cobalt ferrite nanoparticles, Mater. Chem. Phys., 135 (2012) 728–732.
  40. M. Dinari, R. Tabatabaeian, Ultra-fast and highly efficient removal of cadmium ions by magnetic layered double hydroxide/guargum bionanocomposites, Carbohydr. Polym., 192 (2018) 317–326.
  41. Y. Zhang, L. Yan, W. Xu, X. Guo, L. Cui, L. Gao, Q. Wei, B. Du, Adsorption of Pb(II) and Hg(II) from aqueous solution using magnetic CoFe2O4-reduced graphene oxide, J. Mol. Liq., 191 (2014) 177–182.
  42. D. Ouyang, Y. Zhuo, L. Hu, Q. Zeng, Y. Hu, Z. He, Research on the adsorption behavior of heavy metal ions by porous material prepared with silicate tailings, Minerals, 9 (2019) 1–16.
  43. Y. Feng, J.-L. Gong, G.-M. Zeng, Q.-Y. Niu, H.-Y. Zhang, C.-G. Niu, J.-H. Deng, M. Yan, Adsorption of Cd(II) and Zn(II) from aqueous solutions using magnetic hydroxyapatite nanoparticles as adsorbents, Chem. Eng. J., 162 (2010) 487–494.
  44. C. Wu, X. Wei, P. Liu, J. Tan, C. Liao, H. Wang, L. Yin, W. Zhou, H.-J. Cui, Influence of structural Al species on Cd(II) capture by iron muscovite nanoparticles, Chemosphere, 226 (2019) 907–914.
  45. Ş. Kubilay, R. Gürkan, A. Savran, T. Şahan, Removal of Cu(II), Zn(II) and Co(II) ions from aqueous solutions by adsorption onto natural bentonite, Adsorption, 13 (2007) 41–51.
  46. M. Xing, L. Xu, J. Wang, Mechanism of Co(II) adsorption by zero valent iron/graphene nanocomposite, J. Hazard. Mater., 301 (2016) 286–296.
  47. K. Chen, J. He, Y. Li, X. Cai, K. Zhang, T. Liu, Y. Hu, D. Lin, L. Kong, J. Liu, Removal of cadmium and lead ions from water by sulfonated magnetic nanoparticle adsorbents, J. Colloid Interface Sci., 494 (2017) 307–316.
  48. B. Eyvazi, A. Jamshidi-Zanjani, A. Khodadadi Darban, Synthesis of nano-magnetic MnFe2O4 to remove Cr(III) and Cr(VI) from aqueous solution: a comprehensive study, Environ. Pollut., (2019) 113685, (in Press).
  49. C. Bai, L. Wang, Z. Zhu, Adsorption of Cr(III) and Pb(II) by graphene oxide/alginate hydrogel membrane: characterization, adsorption kinetics, isotherm and thermodynamics studies, Int. J. Biol. Macromol., 147 (2020) 898–910.
  50. T.R. Choudhury, K.M. Pathan, M.N. Amin, M. Ali, S.B. Quraishi, A.I. Mustafa, Adsorption of Cr(III) from aqueous solution by groundnut shell, J. Environ. Sci. Water Res., 1 (2012) 144–150.
  51. H. Xu, H. Yuan, J. Yu, S. Lin, Study on the competitive adsorption and correlational mechanism for heavy metal ions using the carboxylated magnetic iron oxide nanoparticles (MNPs-COOH) as efficient adsorbents, Appl. Surf. Sci., 473 (2019) 960–966.
  52. N. Wang, D. Yang, X. Wang, S. Yu, H. Wang, T. Wen, G. Song, Z. Yu, X. Wang, Highly efficient Pb(II) and Cu(II) removal using hollow Fe3O4@PDA nanoparticles with excellent application capability and reusability, Inorg. Chem. Front., 5 (2018) 2174–2182.
  53. W. Fu, Z. Huang, One-pot synthesis of a two-dimensional porous Fe3O4/poly(C3N3S3) network nanocomposite for the selective removal of Pb(II) and Hg(II) from synthetic wastewater, ACS Sustainable Chem. Eng., 6 (2018) 14785–14794.
  54. L. Giraldo, A. Erto, J.C. Moreno-Piraján, Magnetite nanoparticles for removal of heavy metals from aqueous solutions: synthesis and characterization, Adsorption, 19 (2013) 465–474.
  55. X.S. Wang, H.J. Lu, L. Zhu, F. Liu, J.J. Ren, Adsorption of lead(II) ions onto magnetite nanoparticles, Adsorpt. Sci. Technol., 28 (2010) 407–417.
  56. V. Srivastava, Y.C. Sharma, M. Sillanpää, Application of nanomagnesso ferrite (n-MgFe2O4) for the removal of Co2+ ions from synthetic wastewater: kinetic, equilibrium and thermodynamic studies, Appl. Surf. Sci., 338 (2015) 42–54.