1. M.R. Shishehbore, A. Afkhami, H. Bagheri, Salicylic acid functionalized silica-coated magnetite nanoparticles for solid phase extraction and preconcentration of some heavy metal ions from various real samples, Chem. Cent. J., 5 (2011) 41, doi: 10.1186/1752-153X-5-41.
  2. X.-S. Wei, Y.-W. Wu, L.-J. Han, Determination of lead and cadmium in water and pharmaceutical products by inductively coupled plasma optical emission spectrometry with preconcentration by thiourea immobilized silica, Anal. Lett., 48 (2015) 996–1008.
  3. V. Gupta, A. Nayak, Cadmium removal and recovery from aqueous solutions by novel adsorbents prepared from orange peel and Fe2O3 nanoparticles, Chem. Eng. J., 180 (2012) 81–90.
  4. N.K. Srivastava, C.B. Majumder, Novel biofiltration methods for the treatment of heavy metals from industrial wastewater, J. Hazard. Mater., 151 (2008) 1–8.
  5. S. Nekouei, F. Nekouei, I. Tyagi, S. Agarwal, V.K. Gupta, Mixed cloud point/solid phase extraction of lead(II) and cadmium(II) in water samples using modified-ZnO nanopowders, Process Saf. Environ. Prot., 99 (2016) 175–185.
  6. M. Khan, J. Shah, M.R. Jan, Magnetic solid phase extraction of Cd(II) using magnetic nanoparticle (MNPs) and silica coated magnetic nanoparticles (SiMNPs) from environmental water samples, Desal. Water Treat., 83 (2017) 123–132.
  7. P. Liang, Y. Liu, L. Guo, J. Zeng, H.B. Lu, Multiwalled carbon nanotubes as solid-phase extraction adsorbent for the preconcentration of trace metal ions and their determination by inductively coupled plasma atomic emission spectrometry, J. Anal. At. Spectrom., 19 (2004) 1489–1492.
  8. N. Burham, S.A. Azeem, M.F. El-Shahat, Solid phase selective separation and green preconcentration of Cu, Zn, Pb and Cd in drinking water by using novel functionalized resin, Cent. Eur. J. Chem., 7 (2009) 945–954.
  9. U. Divrikli, A.A. Kartal, M. Soylak, L. Elci, Preconcentration of Pb(II), Cr(III), Cu(II), Ni(II) and Cd(II) ions in environmental samples by membrane filtration prior to their flame atomic absorption spectrometric determinations, J. Hazard. Mater., 145 (2007) 459–464.
  10. Y. Zhai, Q. He, Q. Han, Solid-phase extraction of trace metal ions with magnetic nanoparticles modified with 2,6-diaminopyridine, Microchim. Acta, 178 (2012) 405–412.
  11. M. Soylak, Z. Topalak, Multiwalled carbon nanotube impregnated with tartrazine: solid phase extractant for Cd(II) and Pb(II), J. Ind. Eng. Chem., 20 (2014) 581–585.
  12. A. Duran, M. Tuzen, M. Soylak, Preconcentration of some trace elements via using multiwalled carbon nanotubes as solid phase extraction adsorbent, J. Hazard. Mater., 169 (2009) 466–471.
  13. F. Xie, X. Lin, X. Wu, Z. Xie, Solid phase extraction of lead (II), copper (II), cadmium (II) and nickel (II) using gallic acidmodified silica gel prior to determination by flame atomic absorption spectrometry, Talanta, 74 (2008) 836–843.
  14. M. Khan, M. Soylak, Supramolecular solvent based liquid– liquid microextraction of aluminum from water and hair samples prior to UV-visible spectrophotometric detection, RSC Adv., 5 (2015) 62433–62438.
  15. F. Rezaei, Y. Yamini, M. Moradi, A comparison between emulsification of reverse micelle-based supramolecular solvent and solidification of vesicle-based supramolecular solvent for the microextraction of triazines, J. Chromatogr. A, 1327 (2014) 155–159.
  16. C. Baggiani, L. Anfossi, C. Giovannoli, Solid phase extraction of food contaminants using molecular imprinted polymers, Anal. Chim. Acta, 591 (2007) 29–39.
  17. L. Guo, X. Ma, X. Xie, R. Huang, M. Zhang, J. Li, G. Zeng, Y. Fan, Preparation of dual-dummy-template molecularly imprinted polymers coated magnetic graphene oxide for separation and enrichment of phthalate esters in water, Chem. Eng. J, 361 (2019) 245–255.
  18. N. AlMasoud, S.M. Wabaidur, Z.A. Alothman, A.A. Ghfar, T.S. Alomar, A solid phase extraction based UPLC-ESI-MS/MS method using surfactant-modified clay as extraction sorbent for the removal and determination of rhodamine B in industrial wastewater samples, Desal. Water Treat., 195 (2020) 222–231.
  19. H.İ. Ulusoy, A versatile hydrogel including bentonite and gallocyanine for trace Rhodamine B analysis, Colloids Surf., A, 513 (2017) 110–116.
  20. K. Kadirvelu, C. Namasivayam, Activated carbon from coconut coirpith as metal adsorbent: adsorption of Cd(II) from aqueous solution, Adv. Environ. Res., 7 (2003) 471–478.
  21. M. Iqbal, A. Saeed, S.I. Zafar, FTIR spectrophotometry, kinetics and adsorption isotherms modeling, ion exchange, and EDX analysis for understanding the mechanism of Cd2+ and Pb2+ removal by mango peel waste, J. Hazard. Mater., 164 (2009) 161–171.
  22. J. Shah, M.R. Jan, M. Khan, S. Amir, Removal and recovery of cadmium from aqueous solutions using magnetic nanoparticlemodified sawdust: kinetics and adsorption isotherm studies, Desal. Water Treat., 57 (2016) 9736–9744.
  23. W. Aeungmaitrepirom, W. Ngeontae, T. Tuntulani, Silica gel chemically modified with ethyl-2-benzothiazolylacetate for selective extraction of Pb(II) and Cu(II) from real water samples, Anal. Sci., 25 (2009) 1477–1482.
  24. L. Elci, A.A. Kartal, M. Soylak, Solid phase extraction method for the determination of iron, lead and chromium by atomic absorption spectrometry using Amberite XAD-2000 column in various water samples, J. Hazard. Mater., 153 (2008) 454–461.
  25. R. Huang, X. Ma, X. Li, L. Guo, X. Xie, M. Zhang, J. Li, A novel ion-imprinted polymer based on graphene oxide-mesoporous silica nanosheet for fast and efficient removal of chromium (VI) from aqueous solution, J. Colloid Interface Sci., 514 (2018) 544–553.
  26. M. Zhang, B.L. Cushing, C.J. O’Connor, Synthesis and characterization of monodisperse ultra-thin silica-coated magnetic nanoparticles, Nanotechnology, 19 (2008) 085601, doi: 10.1088/0957-4484/19/8/085601.
  27. X. Xie, X. Ma, L. Guo, Y. Fan, G. Zeng, M. Zhang, J. Li, Novel magnetic multi-templates molecularly imprinted polymer for selective and rapid removal and detection of alkylphenols in water, Chem. Eng. J., 357 (2019) 56–65.
  28. J. Hu, G. Chen, I.M. Lo, Removal and recovery of Cr(VI) from wastewater by maghemite nanoparticles, Water Res., 39 (2005) 4528–4536.
  29. Y. Shen, J. Tang, Z. Nie, Y. Wang, Y. Ren, L. Zuo, Preparation and application of magnetic Fe3O4 nanoparticles for wastewater purification, Sep. Purif. Technol., 68 (2009) 312–319.
  30. J.-f. Liu, Z.-s. Zhao, G.-b. Jiang, Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water, Environ. Sci. Technol., 42 (2008) 6949–6954.
  31. S.H. Huang, D.H. Chen, Rapid removal of heavy metal cations and anions from aqueous solutions by an amino-functionalized magnetic nano-adsorbent, J. Hazard. Mater., 163 (2009) 174–179.
  32. S.S. Banerjee, D.H. Chen, Fast removal of copper ions by gum arabic modified magnetic nano-adsorbent, J. Hazard. Mater., 147 (2007) 792–799.
  33. A. Badruddoza, A. Tay, P. Tan, K. Hidajat, M. Uddin, Carboxymethyl-β-cyclodextrin conjugated magnetic nanoparticles as nano-adsorbents for removal of copper ions: synthesis and adsorption studies, J. Hazard. Mater., 185 (2011) 1177–1186.
  34. Y. Zhai, Q. He, X. Yang, Q. Han, Solid phase extraction and preconcentration of trace mercury(II) from aqueous solution using magnetic nanoparticles doped with 1, 5-diphenylcarbazide, Microchim. Acta, 169 (3010) 353–360.
  35. J. Li, X. Zhao, Y. Shi, Y. Cai, S. Mou, G. Jiang, Mixed hemimicelles solid-phase extraction based on cetyltrimethylammonium bromide-coated nano-magnets Fe3O4 for the determination of chlorophenols in environmental water samples coupled with liquid chromatography/spectrophotometry detection, J. Chromatogr. A, 1180 (2008) 24–31.
  36. Y.-H. Deng, C.-C. Wang, J.-H. Hu, W.-L. Yang, S.-K. Fu, Investigation of formation of silica-coated magnetite nanoparticles via sol–gel approach, Colloids Surf., A, 262 (2005) 87–93.
  37. J. Shah, M.R. Jan, A. ul Haq, Removal of lead from aqueous media using carbonized and acid treated orange peel, Tenside, Surfactants, Deterg., 51 (2013) 240–246.
  38. Z. Reddad, C. Gerente, Y. Andres, P. Le Cloirec, Adsorption of several metal ions onto a low-cost biosorbent: kinetic and equilibrium studies, Environ. Sci. Technol., 36 (2002) 2067–2073.
  39. N. Atar, A. Olgun, S. Wang, Adsorption of cadmium (II) and zinc (II) on boron enrichment process waste in aqueous solutions: batch and fixed-bed system studies, Chem. Eng. J., 192 (2012) 1–7.
  40. V.K. Gupta, C.K. Jain, I. Ali, M. Sharma, V.K. Saini, Removal of cadmium and nickel from wastewater using bagasse fly ash — a sugar industry waste, Water Res., 37 (2003) 4038–4044.