References

  1. Y. Jiang, F. Li, G. Ding, Y. Chen, Y. Liu, Y. Hong, P. Liu, X. Qi, L. Ni, Synthesis of a novel ionic liquid modified copolymer hydrogel and its rapid removal of Cr(VI) from aqueous solution, J. Colloid Interf. Sci., 455 (2015) 125–133.
  2. Z. Wen, Y. Zhang, C. Dai, Z. Sun, Nanocasted synthesis of magnetic mesoporous iron cerium bimetal oxides (MMIC) as an efficient heterogeneous Fenton-like catalyst for oxidation of arsenite, J. Hazard. Mater., 287 (2015) 225–233.
  3. A. Maleki, B. Hayati, M. Naghizadeh, S.W. Joo, Adsorption of hexavalent chromium by metal organic frameworks from aqueous solution, J. Ind. Eng. Chem., 28 (2015) 211–216.
  4. M. Bhaumik, S. Agarwal, V.K. Gupta, A. Maity, Enhanced removal of Cr(VI) from aqueous solutions using polypyrrole wrapped oxidized MWCNTs nanocomposites adsorbent, J. Colloid Interf. Sci., 470 (2016) 257–267.
  5. B. Qiu, C. Xu, D. Sun, Q. Wang, H. Gu, X. Zhang, B.L. Weeks, J. Hopper, T.C. Ho, Z. Guo, S. Wei, Polyaniline coating with various substrates for hexavalent chromium removal, Appl. Surf. Sci., 334 (2015) 7–14.
  6. Y. Wang, D. Liu, J. Lu, J. Huang, Enhanced adsorption of hexavalent chromium from aqueous solutions on facilely synthesized mesoporous iron–zirconium bimetal oxide, Colloid. Surf. A: Physicochem. Eng. Asp., 481 (2015) 133–142.
  7. X. Ge, C.D. Gu, X.L. Wang, J.P. Tu, Spinel type CoFe oxide porous nanosheets as magnetic adsorbents with fast removal ability and facile separation, J. Colloid Interf. Sci., 454 (2015) 134–143.
  8. X. Sun, L. Yang, Q. Li, Z. Liu, T. Dong, H. Liu, Polyethylenimine-functionalized poly(vinyl alcohol) magnetic microspheres as a novel adsorbent for rapid removal of Cr(VI) from aqueous solution, Chem. Eng. J., 262 (2015) 101–108.
  9. H. Wang, X. Yuan, Y. Wu, X. Chen, L. Leng, H. Wang, H. Li, G. Zeng, Facile synthesis of polypyrrole decorated reduced graphene oxide–Fe3O4 magnetic composites and its application for the Cr(VI) removal, Chem. Eng. J., 262 (2015) 597–606.
  10. A. Kaur, U. Gupta, A review on applications of nanoparticles for the preconcentration of environmental pollutants, J. Mater. Chem., 19 (2009) 8279–8289.
  11. A. Jaiswal, R. Mani, S. Banerjee, R.K. Gautam, M.C. Chattopadhyaya, Synthesis of novel nano-layered double hydroxide by urea hydrolysis method and their application in removal of chromium(VI) from aqueous solution: kinetic, thermodynamic and equilibrium studies, J. Mol. Liquids, 202 (2015) 52–61.
  12. C.T. Gore, S. Omwoma, W. Chen, Y.-F. Song, Interweaved LDH/PAN nanocomposite films: application in the design of effective hexavalent chromium adsorption technology, Chem. Eng. J., 284 (2016) 794–801.
  13. T. Sathvika, Manasi, V. Rajesh, N. Rajesh, Microwave assisted immobilization of yeast in cellulose biopolymer as a green adsorbent for the sequestration of chromium, Chem. Eng. J., 279 (2015) 38–46.
  14. A.E. Chávez-Guajardo, J.C. Medina-Llamas, L. Maqueira, C.A.S. Andrade, K.G.B. Alves, C.P. de Melo, Efficient removal of Cr(VI) and Cu(II) ions from aqueous media by use of polypyrrole/ maghemite and polyaniline/maghemite magnetic nanocomposites, Chem. Eng. J., 281 (2015) 826–836.
  15. P. Khare, A. Yadav, J. Ramkumar, N. Verma, Microchannel-embedded metal–carbon–polymer nanocomposite as a novel support for chitosan for efficient removal of hexavalent chromium from water under dynamic conditions, Chem. Eng. J., 293 (2016) 44–54.
  16. K. Singh, J.K. Arora, T.J.M. Sinha, S. Srivastava, Functionalization of nanocrystalline cellulose for decontamination of Cr(III) and Cr(VI) from aqueous system: computational modeling approach, Clean Technol. Environ. Policy, 16 (2014) 1179–1191.
  17. S. Kalidhasan, A.S.K. Kumar, V. Rajesh, N. Rajesh, Enhanced adsorption of hexavalent chromium arising out of an admirable interaction between a synthetic polymer and an ionic liquid, Chem. Eng. J., 222 (2013) 454–463.
  18. Z. Jiang, Y. Liu, G. Zeng, W. Xu, B. Zheng, X. Tan, S. Wang, Adsorption of hexavalent chromium by polyacrylonitrile (PAN)-based activated carbon fibers from aqueous solution, RSC Adv., 5 (2015) 25389–25397.
  19. C. Luo, Z. Tian, B. Yang, L. Zhang, S. Yan, Manganese dioxide/ iron oxide/acid oxidized multi-walled carbon nanotube magnetic nanocomposite for enhanced hexavalent chromium removal, Chem. Eng. J., 234 (2013) 256–265.
  20. M.K. Kim, K.S. Sundaram, G.A. Iyengar, K.-P. Lee, A novel chitosan functional gel included with multiwall carbon nanotube and substituted polyaniline as adsorbent for efficient removal of chromium ion, Chem. Eng. J., 267 (2015) 51–64.
  21. Y.-L. Yu, Y.-T. Zhuang, X.-Y. Song, J.-H. Wang, Lyophilized carbon nanotubes/graphene oxide modified cigarette filter for the effective removal of cadmium and chromium from mainstream smoke, Chem. Eng. J., 280 (2015) 58–65.
  22. J. Hu, C. Chen, X. Zhu, X. Wang, Removal of chromium from aqueous solution by using oxidized multiwalled carbon nanotubes, J. Hazard. Mater., 162 (2009) 1542–1550.
  23. A.A. Ihsanullah, A.M. Al-Amer, T. Laoui, M.J. Al-Marri, M.S. Nasser, M. Khraisheh, M.A. Atieh, Heavy metal removal from aqueous solution by advanced carbon nanotubes: critical review of adsorption applications, Sep. Pur. Technol., 157 (2016) 141–161.
  24. M. Singh, S. Vinodh Kumar, S.A. Waghmare, P.D. Sabale, Aragonite–vaterite–calcite: polymorphs of CaCO3 in 7th century CE lime plasters of Alampur group of temples, India, Construct. Build. Mater., 112 (2016) 386–397.
  25. S. Mishra, S.H. Sonawane, R.P. Singh, Studies on characterization of nano CaCO3 Prepared by the in situ deposition technique and its application in PP-nano CaCO3 composites, J. Polym. Sci. Part B: Polym. Phys., 43 (2005) 107–113.
  26. S. Yuan, Z. Zhou, G. Li, Structural evolution from mesoporous α-Fe2O3 to Fe3O4@C and γ-Fe2O3 nanospheres and their lithium storage performances, Cryst. Eng. Comm., 13 (2011) 4709–4713.
  27. Q.-G. Zhu, A.N.A. Sujari, S.A. Ghani, MWCNT modified composite pencil graphite electrodes fabricated by direct dripping and electrophoretic deposition methods: a comparison study, J. Electrochem. Soc., 160 (2013) B23–B29.
  28. J. Kim, M.K. Chung, B.H. Ka, J.H. Ku, S. Park, J. Ryu, S.M. Oh, The role of metallic Fe and carbon matrix in Fe2O3/Fe/carbon nanocomposite for lithium-ion batteries, J. Electrochem. Soc., 157 (2010) A412–A417.
  29. E.-S.M. Duraia, M. Burkitbaev, H. Mohamedbakr, Z. Mansurov, S. Tokmolden, G.W. Beall, Growth of carbon nanotubes on diatomite, Vacuum, 84 (2010) 464–468.
  30. W. Li, H. Zhang, C. Wang, Y. Zhang, L. Xu, K. Zhu, S. Xie, Raman characterization of aligned carbon nanotubes produced by thermal decomposition of hydrocarbon vapor, Appl. Phys. Lett., 70 (1997) 2684.
  31. S.J. Sung, T. Kim, S.J. Yang, J.Y. Oh, C.R. Park, New insights into the oxidation of single-walled carbon nanotubes for the fabrication of transparent conductive films, Carbon, 81 (2015) 525–534.
  32. B. Bahrami, A. Khodadadi, Y. Mortazavib, M. Esmaieli, Short time synthesis of high quality carbon nanotubes with high rates by CVD of methane on continuously emerged iron nanoparticles, Appl. Surf. Sci., 257 (2011) 9710–9716.
  33. Y. Wang, L. Shi, L. Gao, Q. Wei, L. Cui, L. Hu, L. Yan, B. Du, The removal of lead ions from aqueous solution by using magnetic hydroxypropyl chitosan/oxidized multiwalled carbon nanotubes composites, J. Colloid Interf. Sci., 451 (2015) 7–14.
  34. H. Alijani, M.H. Beyki, S.N. Mirzababaei, Adsorption of UO22+ ions from aqueous solution using amine functionalized MWCNT: kinetic, thermodynamic and isotherm study, J. Radioanal. Nucl. Chem., 306 (2015) 165–173.
  35. G. Wang, J. Chen, Y. Tian, Y. Jin, Y. Li, Water assisted synthesis of double-walled carbon nanotubes with a narrow diameter distribution from methane over a Co–Mo/MgO catalyst, Catal. Today, 183 (2012) 26–33.
  36. X.-H. Wang, F.-F. Liu, L. Lu, S. Yang, Y. Zhao, L.-B. Sun, S.-G. Wang, Individual and competitive adsorption of Cr(VI) and phosphate onto synthetic Fe–Al hydroxides, Colloid. Surf. A Physicochem. Eng. Asp., 423 (2013) 42–49.
  37. A. Ahmadpour, N. Eftekhari, A. Ayati, Performance of MWCNTs and a low-cost adsorbent for chromium(VI) ion removal, J. Nanostruct. Chem., 4 (2014) 171–178.
  38. A.S. Krishna Kumar, S.-J. Jiang, W.-L. Tseng, Effective adsorption of chromium(VI)/Cr(III) from aqueous solution using ionic liquid functionalized mulitwalled carbon nanotube as a super sorbent, J. Mater. Chem. A, 3 (2015) 7044–7057.
  39. C. Jung, J. Heo, J. Han, N. Her, S.-J. Lee, J. Oh, J. Ryu, Y. Yoon, Hexavalent chromium removal by various adsorbents: powdered activated carbon, chitosan, and single/multi-walled carbon nanotubes, Sep. Pur. Technol., 106 (2013) 63–71.
  40. Y. Li, L. Cao, L. Li, C. Yang, In situ growing directional spindle TiO2 nanocrystals on cellulose fibers for enhanced Pb2+ adsorption from water, J. Hazard. Mater., 289 (2015) 140–148.
  41. S. Pan, J. Li, G. Wana, C. Liu, W. Fan, L. Wang, Nanosized yolk–shell Fe3O4@Zr(OH)x spheres for efficient removal of Pb(II) from aqueous solution, J. Hazard. Mater., 309 (2016) 1–9.
  42. S. Rahimi, R.M. Moattari, L. Rajabi, A.A. Derakhshan, M. Keyhani, Iron oxide/hydroxide (α,γ-FeOOH) nanoparticles as high potential adsorbents for lead removal from polluted aquatic media, J. Ind. Eng. Chem., 23 (2015) 33–43.
  43. K. Kalantari, M.B. Ahmad, H.R.F. Masoumi, K. Shameli, M. Basri, R. Khandanlou, Rapid and high capacity adsorption of heavy metals by Fe3O4/montmorillonite nanocomposite using response surface methodology: preparation, characterization, optimization, equilibrium isotherms, and adsorption kinetics study, J. Taiwan Inst. Chem. Eng., 49 (2015) 192–198.
  44. J. Hu, C. Chen, X. Zhu, X. Wang, Removal of chromium from aqueous solution by using oxidized multiwalled carbon nanotubes, J. Hazard. Mater., 162 (2009) 1542–1550.
  45. M. Ali Atieh, Removal of Chromium (VI) from polluted water using carbon nanotubes supported with activated carbon, Procedia Environ. Sci., 4 (2011) 281–293.
  46. M.H. Beyki, F. Shemirani, Dual application of facilely synthesized Fe3O4 nanoparticles: fast reduction of nitro compound and preparation of magnetic polyphenylthiourea nanocomposite for efficient adsorption of lead ions, RSC Adv., 5 (2015) 22224–22233.
  47. M.H. Baki, F. Shemirani, R. Khani, M. Bayat, Applicability of diclofenac–montmorillonite as a selective sorbent for adsorption of palladium(II); kinetic and thermodynamic studies, Anal. Method., 6 (2014) 1875–1883.
  48. R. Khani, S. Sobhani, M.H. Beyki, Highly selective and efficient removal of lead with magnetic nano-adsorbent: multivariate optimization, isotherm and thermodynamic studies, J. Colloid Interf. Sci., 466 (2016) 198–205.
  49. Z.-N. Huang, X.-L. Wang, D.-S. Yang, Adsorption of Cr(VI) in wastewater using magnetic multi-wall carbon nanotubes, Water Sci. Eng., 8 (2015) 226–232.
  50. H. Alijani, Z. Shariatinia, A. Aroujalian Mashhadi, Water assisted synthesis of MWCNTs over natural magnetic rock: an effective magnetic adsorbent with enhanced mercury(II) adsorption property, Chem. Eng. J., 281 (2015) 468–481.