1. O. Tsydenova, M. Bengtsson, Chemical hazards associated with treatment of waste electrical and electronic equipment, Waste Manage., 31 (2011) 45–58.
  2. G. Chauhan, P.R. Jadhao, K.K. Pant, K.D.P. Nigam, Novel technologies and conventional processes for recovery of metals from waste electrical and electronic equipment: challenges and opportunities – a review, J. Environ. Chem. Eng., 6 (2018) 1288–1304.
  3. A. Lixandru, P. Venkatesan, C. Jonsson, I. Poenaru, B. Hall, Y. Yang, A. Walton, K. Guth, R. Gauss, O. Gutfleisch, Identification and recovery of rare-earth permanent magnets from waste electrical and electronic equipment, Waste Manage., 68 (2017) 482–489.
  4. G.J. Ruiz-Mercado, M.A. Gonzalez, R.L. Smith, D.E. Meyer, A conceptual chemical process for the recycling of Ce, Eu, and Y from LED flat panel displays, Resour. Conserv. Recyl., 126 (2017) 42–49.
  5. Y. Kim, H. Seo, Y. Roh, Metal recovery from the mobile phone waste by chemical and biological treatments, Minerals, 8 (2018) 1–10.
  6. S.R. Mueller, P.A. Wager, R. Widmer, I.D. Williams, A geological reconnaissance of electrical and electronic waste as a source for rare earth metals, Waste Manage., 45 (2015) 226–234.
  7. C. Agarwal, R.W. Cattrall, S.D. Kolev, Donnan dialysis based separation of gold(III) from electronic waste solutions using an anion exchange pore-filled membrane, J. Membr. Sci., 514 (2016) 210–216.
  8. A. Gurgul, W. Szczepaniak, M. Zablocka-Malicka, Incineration and pyrolysis vs. steam gasification of electronic waste, Sci. Total Environ., 624 (2018) 1119–1124.
  9. J. Bacher, A. Mrotzek, M. Wahlstrom, Mechanical pre-treatment of mobile phones and its effect on the printed circuit assemblies (PCAs), Waste Manage., 45 (2015) 235–245.
  10. L.A. Diaz, T.E. Lister, Economic evaluation of an electrochemical process for the recovery of metals from electronic waste, Waste Manage., 74 (2018) 384–392.
  11. S.M. Abdelbasir, C.T. El-Sheltawy, D.M. Abdo, Green processes for electronic waste recycling: a review, J. Sustain. Metall., 4 (2018) 295–311.
  12. S.M. Abdelbasir, S.S.M. Hassan, A.H. Kamel, R.S. El-Nasr, Status of electronic waste recycling techniques: a review, Environ. Sci. Pollut. Res., 25 (2018) 16533–16547.
  13. Y. Yao, N.F. Farac, G. Azimi, Supercritical fluid extraction of rare earth elements from nickel metal hydride battery, ACS Sustain. Chem. Eng., 6 (2017) 1417–1426.
  14. G. Zhongqun, Z. Kui, J. Jiefang, W. Guanshi, W. Xiaojun, Research progress on adsorption characteristics of rare earth ions by different adsorbents, J. Chinese Soc. Rare Earth, 36 (2018) 406–416.
  15. M.J. Page, K. Soldenhoff, M.D. Ogden, Comparative study of the application of chelating resins for rare earth recovery, Hydrometallurgy, 169 (2017) 275–281.
  16. C.M. Babu, K. Binnemans, J. Roosen, Ethylenediaminetriacetic acid-functionalized activated carbon for the adsorption of rare earths from aqueous solutions, Ind. Eng. Chem. Res., 57 (2018) 1487–1497.
  17. D.L. Ramasamy, E. Repo, V. Srivastava, M. Sillanpaa, Chemically immobilized and physically adsorbed PAN/acetylacetone modified mesoporous silica for the recovery of rare earth elements from the waste water-comparative and optimization study, Water Res., 114 (2017) 264–276.
  18. T. Ogata, H. Narita, M. Tanaka, Adsorption behavior of rare earth elements on silica gel modified with diglycol amic acid, Hydrometallurgy, 152 (2015) 178–182.
  19. W. Yang, Z. Xuefeng, Z. Baosheng, L. Zhong, L. Baoyi, Adsorption performance of mesoporous nanometer γ-Al2O3 to rare earth elements lanthanum and cerium, Chinese J. Environ. Eng., 6 (2012) 4519–4524.
  20. F. Qingqin, Preparation and adsorption properties of mesoporous nano-γ-Al2O3, Zhengzhou University, Zhengzhou, 2007 (In Chinese).
  21. Q. Guang-ri, Y. Lan-hao, P. Xu-li, H. Bin, J. Zu-cheng, P. Tianyou, Study on adsor ption behaviors of rare earth ions on nanometer Al2O3 powder by ICP-AES, J. Anal. Sci., 20 (2004) 337–340.
  22. M.M. Rahman, S.B. Khan, H.M. Marwani, A.M. Asiri, SnO2–TiO2 nanocomposites as new adsorbent for efficient removal of La(III) ions from aqueous solutions, J. Taiwan Inst. Chem. Eng., 45 (2014) 1964–1974.
  23. J. Roosen, K. Binnemans, Adsorption and chromatographic separation of rare earths with EDTA- and DTPA-functionalized chitosan biopolymers, J. Mater. Chem. A, 2 (2014) 1530–1540.
  24. M.M. Yusoff, N.R.N. Mostapa, M.S. Sarkar, T.K. Biswas, M.L. Rahman, S.E. Arshad, M.S. Sarjadi, A.D. Kulkarni, Synthesis of ion imprinted polymers for selective recognition and separation of rare earth metals, J. Rare Earth, 35 (2017) 177–186.
  25. D. Wu, Y. Sun, Q. Wang, Adsorption of lanthanum (III) from aqueous solution using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester-grafted magnetic silica nanocomposites, J. Hazard. Mater., 260 (2013) 409–419.
  26. L. Molina, J. Gaete, I. Alfaro, V. Ide, F. Valenzuela, J. Parada, C. Basualto, Synthesis and characterization of magnetite nanoparticles functionalized with organophosphorus compounds and its application as an adsorbent for La (III), Nd (III) and Pr (III) ions from aqueous solutions, J. Mol. Liq., 275 (2019) 178–191.
  27. L. Jiang, W. Zhang, C. Luo, D. Cheng, J. Zhu, Adsorption toward trivalent rare earth element from aqueous solution by zeolitic imidazolate frameworks, Ind. Eng. Chem. Res., 55 (2016) 6365–6372.
  28. R. Zandipak, S. Sobhanardakani, Novel mesoporous Fe3O4/SiO2/CTAB–SiO2 as an effective adsorbent for the removal of amoxicillin and tetracycline from water, Clean Technol. Environ., 20 (2018) 871–885.
  29. D. Yan-jie, G. Ke, G. Xin-xing, Spectrophotometric determination of microamont of lanthanum with arsenazo, J. Chongqing Norm. U. (Nat. Sci. Edit.), 21 (2004) 43–45.
  30. S. Wen-xin, S. Ya-qin, L. Yong-lin, L. Xiang, Determination of total rare earth contents in Sm-Eu-Gd concentrate by EDTA volumetric method, J. Anal. Sci., 21 (2005) 343–344.
  31. M.A. Hafez, I.M. Kenawy, M.A. Ramadan, Titration of thorium and rare earths with ethylenediaminetetraacetic acid using Semimethylthymol Blue by visual end-point indication, Analyst, 119 (1994) 1103–1106.
  32. H. Shi, Y. Huang, C. Cheng, G. Ji, Y. Yang, H. Yuan, Preparation and characterization of chain-like and peanut-like Fe3O4@SiO2 core-shell structure, J. Nanosci. Nanotechnol., 13 (2013) 6953–6960.
  33. W. Xie, C. Zhang, Production of medium-chain structured lipids using dual acidic ionic liquids supported on Fe3O4@SiO2 composites as magnetically recyclable catalysts, LWT-Food Sci. Technol., 93 (2018) 71–78.
  34. G.H. Du, Z.L. Liu, X. Xia, Q. Chu, S.M. Zhang, Characterization and application of Fe3O4/SiO2 nanocomposites, J. Sol-Gel Sci. Technol., 39 (2006) 285–291.
  35. M. Esmaeilpour, A.R. Sardarian, J. Javidi, Synthesis and characterization of Schiff base complex of Pd(II) supported on superparamagnetic Fe3O4@SiO2 nanoparticles and its application as an efficient copper- and phosphine ligandfree recyclable catalyst for Sonogashira–Hagihara coupling reactions, J. Organomet. Chem., 749 (2014) 233–240.
  36. M. Esmaeilpour, A.R. Sardarian, J. Javidi, Schiff base complex of metal ions supported on superparamagnetic Fe3O4@SiO2 nanoparticles: an efficient, selective and recyclable catalyst for synthesis of 1,1-diacetates from aldehydes under solvent-free conditions, Appl. Catal. A, 445–446 (2012) 359–367.
  37. J. Zucheng, C. Ruxiu, Z. Huashan, Rare Earth Element Analytical Chemistry, Science Press, Beijing, 2000 (In Chinese).
  38. N. Moradi, S. Salem, A. Salem, Optimizing adsorption of blue pigment from wastewater by nano-porous modified Na-bentonite using spectrophotometry based on response surface method, Spectrochim. Acta A, 193 (2018) 54–62.
  39. M. Zendehdel, B. Shoshtari-Yeganeh, H. Khanmohamadi, G. Cruciani, Removal of fluoride from aqueous solution by adsorption on NaP:HAp nanocomposite using response surface methodology, Process Saf. Environ., 109 (2017) 172–191.
  40. A.M. Zayed, A.Q. Selim, E.A. Mohamed, M.S.M. Abdel Wahed, M.K. Seliem, M. Sillanp, Adsorption characteristics of Na-A zeolites synthesized from Egyptian kaolinite for manganese in aqueous solutions: response surface modeling and optimization, Appl. Clay Sci., 140 (2017) 17–24.
  41. M. Mourabet, A. El Rhilassi, H. El Boujaady, M. Bennani-Ziatni, A. Taitai, Use of response surface methodology for optimization of fluoride adsorption in an aqueous solution by Brushite, Arab. J. Chem., 10 (2017) S3292–S3302.
  42. M. Dastkhoon, M. Ghaedi, A. Asfaram, A. Goudarzi, S.M. Mohammadi, S. Wang, Improved adsorption performance of nanostructured composite by ultrasonic wave: optimization through response surface methodology, isotherm and kinetic studies, Ultrason. Sonochem., 37 (2017) 94–105.
  43. B. Kakavandi, M. Jahangiri-rad, M. Rafiee, A.R. Esfahani, A.A. Babaei, Development of response surface methodology for optimization of phenol and p-chlorophenol adsorption on magnetic recoverable carbon, Microporous Mesoporous Mater., 231 (2016) 192–206.
  44. Y. Wu, Y. Jin, J. Cao, P. Yilihan, Y. Wen, J. Zhou, Optimizing adsorption of arsenic(III) by NH2-MCM-41 using response surface methodology, J. Ind. Eng. Chem., 20 (2014) 2792–2800.
  45. S. Sun, J. Yang, Y. Li, K. Wang, X. Li, Optimizing adsorption of Pb(II) by modified litchi pericarp using the response surface methodology, Ecotoxicol. Environ. Saf., 108 (2014) 29–35.
  46. M. Arulkumar, P. Sathishkumar, T. Palvannan, Optimization of Orange G dye adsorption by activated carbon of Thespesia populnea pods using response surface methodology, J. Hazard. Mater., 186 (2011) 827–834.
  47. M. Xia, C. Ye, K. Pi, D. Liu, A.R. Gerson, Cr(III) removal from simulated solution using hydrous magnesium oxide coated fly ash: optimization by response surface methodology (RSM), Chinese J. Chem. Eng., 26 (2018) 1192–1199.
  48. S.S. Hussien, Biosorption of lanthanum from aqueous solution using Pleurotus ostreatus basidiocarps, Int. J. Biotechnol. Res., 2 (2014) 26–36.
  49. Z. Birungi, E. Chirwa, The kinetics of uptake and recovery of lanthanum using freshwater algae as biosorbents: comparative analysis, Bioresour. Technol., 160 (2014) 43–51.
  50. F. Zhao, E. Repo, Y. Meng, X. Wang, D. Yin, M. Sillanpaa, An EDTA-β-cyclodextrin material for the adsorption of rare earth elements and its application in preconcentration of rare earth elements in seawater, J. Colloid Interface Sci., 465 (2016) 215–224.
  51. S. Iftekhar, V. Srivastava, M. Sillanpää, Enrichment of lanthanides in aqueous system by cellulose based silica nanocomposite, Chem. Eng. J., 320 (2017) 151–159.
  52. X. Xu, X.-Y. Jiang, F.-P. Jiao, X.-Q. Chen, J.-G. Yu, Tunable assembly of porous three-dimensional graphene oxidecorn zein composites with strong mechanical properties for adsorption of rare earth elements, J. Taiwan Inst. Chem. Eng., 85 (2018) 106–114.
  53. A.A. Galhoum, M.G. Mafhouz, S.T. Abdel-Rehem, N.A. Gomaa, A.A. Atia, T. Vincent, E. Guibal, Cysteine-functionalized chitosan magnetic nano-based particles for the recovery of light and heavy rare earth metals: uptake kinetics and sorption isotherms, Nanomaterials (Basel), 5 (2015) 154–179.
  54. M. Butnariu, P. Negrea, L. Lupa, M. Ciopec, A. Negrea, M. Pentea, I. Sarac, I. Samfira, Remediation of rare earth element pollutants by sorption process using organic natural sorbents, Int. J. Environ. Res. Public Health, 12 (2015) 11278–11287.
  55. A. Tadjarodi, V. Jalalat, R. Zare-Dorabei, Adsorption of La(III) in aqueous systems by N-(2-hydroxyethyl) salicylaldiminefunctionalized mesoporous silica, Mater. Res. Bull., 61 (2015) 113–119.
  56. F. Zhou, J. Feng, X. Xie, B. Wu, Q. Liu, X. Wu, R. Chi, Adsorption of lanthanum (III) and yttrium (III) on kaolinite: kinetics and adsorption isotherms, Physicochem. Probl. Miner. Process., 55 (2019) 928–939.
  57. F. Granados-Correa, J. Vilchis-Granados, M. Jiménez-Reyes, L.A. Quiroz-Granados, Adsorption behaviour of La(III) and Eu(III) ions from aqueous solutions by hydroxyapatite: kinetic, isotherm, and thermodynamic studies, J. Chem., 2013 (2013) 1–9.
  58. L. Mei, L. Zhaogang, W. Jinxiu, H. Yanhong, Rare Earth Elements and Their Analytical Chemistry, Chemical Industry Press, Beijing, 2009 (In Chinese).
  59. M. Liu, W.B. Yuan, Q. Zhang, L. Yan, R.D. Yang, Synthesis, characterization and DNA interaction studies of complexes of lanthanide nitrates with tris(2-[(3,4-dihydroxybenzylidene) imino]ethyl)amine, Spectrochim. Acta A, 70 (2008) 1114–1119.
  60. H. Guangyan, Introduction to rare earth chemistry, Science Press, Beijing, 2014 (In Chinese).