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Bioinorganic Chemistry and Applications
Volume 2017, Article ID 1624243, 10 pages
https://doi.org/10.1155/2017/1624243
Research Article

A Comparative Study of Raw and Metal Oxide Impregnated Carbon Nanotubes for the Adsorption of Hexavalent Chromium from Aqueous Solution

1Department of Chemical Engineering, KFUPM, Dhahran 31261, Saudi Arabia
2Department of Mechanical Engineering, KFUPM, Dhahran 31261, Saudi Arabia
3Department of Geosciences, KFUPM, Dhahran 31261, Saudi Arabia

Correspondence should be addressed to Tahar Laoui; as.ude.mpufk@iuoalt

Received 13 February 2017; Revised 12 March 2017; Accepted 16 March 2017; Published 10 April 2017

Academic Editor: Viktor Kochkodan

Copyright © 2017 Muhammad I. Qureshi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Linked References

  1. D. Mohan and C. U. Pittman Jr., “Activated carbons and low cost adsorbents for remediation of tri- and hexavalent chromium from water,” Journal of Hazardous Materials, vol. 137, no. 2, pp. 762–811, 2006. View at Publisher · View at Google Scholar · View at Scopus
  2. B. M. Weckhuysen, I. E. Wachs, and R. A. Schoonheydt, “Surface chemistry and spectroscopy of chromium in inorganic oxides,” Chemical Reviews, vol. 96, no. 8, pp. 3327–3349, 1996. View at Publisher · View at Google Scholar · View at Scopus
  3. S. Kalidhasan, M. Ganesh, S. Sricharan, and N. Rajesh, “Extractive separation and determination of chromium in tannery effluents and electroplating waste water using tribenzylamine as the extractant,” Journal of Hazardous Materials, vol. 165, no. 1–3, pp. 886–892, 2009. View at Publisher · View at Google Scholar · View at Scopus
  4. J. R. Rao, P. Thanikaivelan, K. J. Sreeram, and B. U. Nair, “Green route for the utilization of chrome shavings (chromium-containing solid waste) in tanning industry,” Environmental Science and Technology, vol. 36, no. 6, pp. 1372–1376, 2002. View at Publisher · View at Google Scholar · View at Scopus
  5. S. Vasudevan, G. Sozhan, S. Mohan, R. Balaji, P. Malathy, and S. Pushpavanam, “Electrochemical regeneration of chromium containing solution from metal finishing industry,” Industrial and Engineering Chemistry Research, vol. 46, no. 9, pp. 2898–2901, 2007. View at Publisher · View at Google Scholar · View at Scopus
  6. A. K. Bhattacharya, T. K. Naiya, S. N. Mandal, and S. K. Das, “Adsorption, kinetics and equilibrium studies on removal of Cr(VI) from aqueous solutions using different low-cost adsorbents,” Chemical Engineering Journal, vol. 137, no. 3, pp. 529–541, 2008. View at Publisher · View at Google Scholar · View at Scopus
  7. D. Mohan, K. P. Singh, and V. K. Singh, “Removal of hexavalent chromium from aqueous solution using low-cost activated carbons derived from agricultural waste materials and activated carbon fabric cloth,” Industrial and Engineering Chemistry Research, vol. 44, no. 4, pp. 1027–1042, 2005. View at Publisher · View at Google Scholar · View at Scopus
  8. D. Mohan, K. P. Singh, and V. K. Singh, “Trivalent chromium removal from wastewater using low cost activated carbon derived from agricultural waste material and activated carbon fabric cloth,” Journal of Hazardous Materials, vol. 135, no. 1–3, pp. 280–295, 2006. View at Publisher · View at Google Scholar · View at Scopus
  9. P. Miretzky and A. F. Cirelli, “Cr(VI) and Cr(III) removal from aqueous solution by raw and modified lignocellulosic materials: a review,” Journal of Hazardous Materials, vol. 180, no. 1–3, pp. 1–19, 2010. View at Publisher · View at Google Scholar · View at Scopus
  10. F. C. Richard and A. C. M. Bourg, “Aqueous geochemistry of chromium: a review,” Water Research, vol. 25, no. 7, pp. 807–816, 1991. View at Publisher · View at Google Scholar · View at Scopus
  11. J. Zhu, H. Gu, J. Guo et al., “Mesoporous magnetic carbon nanocomposite fabrics for highly efficient Cr(VI) removal,” Journal of Materials Chemistry A, vol. 2, no. 7, pp. 2256–2265, 2014. View at Publisher · View at Google Scholar · View at Scopus
  12. B. Qiu, C. Xu, D. Sun et al., “Polyaniline coating on carbon fiber fabrics for improved hexavalent chromium removal,” RSC Advances, vol. 4, no. 56, pp. 29855–29865, 2014. View at Publisher · View at Google Scholar · View at Scopus
  13. B. Qiu, C. Xu, D. Sun et al., “Polyaniline coated ethyl cellulose with improved hexavalent chromium removal,” ACS Sustainable Chemistry and Engineering, vol. 2, no. 8, pp. 2070–2080, 2014. View at Publisher · View at Google Scholar · View at Scopus
  14. T. Karthikeyan, S. Rajgopal, and L. R. Miranda, “Chromium(VI) adsorption from aqueous solution by Hevea Brasilinesis sawdust activated carbon,” Journal of Hazardous Materials, vol. 124, no. 1–3, pp. 192–199, 2005. View at Publisher · View at Google Scholar · View at Scopus
  15. C. Xu, B. Qiu, H. Gu et al., “Synergistic interactions between activated carbon fabrics and toxic hexavalent chromium,” ECS Journal of Solid State Science and Technology, vol. 3, no. 3, pp. M1–M9, 2014. View at Publisher · View at Google Scholar · View at Scopus
  16. K. K. Krishnani and S. Ayyappan, “Heavy metals remediation of water using plants and lignocellulosic agrowastes,” Reviews of Environmental Contamination and Toxicology, vol. 188, pp. 59–84, 2006. View at Publisher · View at Google Scholar · View at Scopus
  17. M. Aliabadi, I. Khazaei, H. Fakhraee, and M. T. H. Mousavian, “Hexavalent chromium removal from aqueous solutions by using low-cost biological wastes: equilibrium and kinetic studies,” International Journal of Environmental Science and Technology, vol. 9, no. 2, pp. 319–326, 2012. View at Publisher · View at Google Scholar · View at Scopus
  18. D. E. Kimbrough, Y. Cohen, A. M. Winer, L. Creelman, and C. Mabuni, “A critical assessment of chromium in the environment,” Critical Reviews in Environmental Science and Technology, vol. 29, no. 1, pp. 1–46, 1999. View at Publisher · View at Google Scholar · View at Scopus
  19. E. Salazar, M. I. Ortiz, A. M. Urtiaga, and J. A. Irabien, “Equilibrium and kinetics of chromium(VI) extraction with Aliquat 336,” Industrial and Engineering Chemistry Research, vol. 31, no. 6, pp. 1516–1522, 1992. View at Publisher · View at Google Scholar · View at Scopus
  20. K. A. Matis and P. Mavros, “Recovery of metals by ion flotation from dilute aqueous solutions,” Separation and Purification Method, vol. 20, no. 1, pp. 1–48, 1991. View at Publisher · View at Google Scholar · View at Scopus
  21. F. Akbal and S. Camcı, “Copper, chromium and nickel removal from metal plating wastewater by electrocoagulation,” Desalination, vol. 269, no. 1–3, pp. 214–222, 2011. View at Publisher · View at Google Scholar · View at Scopus
  22. G. Tiravanti, D. Petruzzelli, and R. Passino, “Pretreatment of tannery wastewaters by an ion exchange process for Cr(III) removal and recovery,” Water Science and Technology, vol. 36, no. 2-3, pp. 197–207, 1997. View at Publisher · View at Google Scholar · View at Scopus
  23. S. Rengaraj, K.-H. Yeon, and S.-H. Moon, “Removal of chromium from water and wastewater by ion exchange resins,” Journal of Hazardous Materials, vol. 87, no. 1–3, pp. 273–287, 2001. View at Publisher · View at Google Scholar · View at Scopus
  24. S. Rengaraj, C. K. Joo, Y. Kim, and J. Yi, “Kinetics of removal of chromium from water and electronic process wastewater by ion exchange resins: 1200H, 1500H and IRN97H,” Journal of Hazardous Materials, vol. 102, no. 2-3, pp. 257–275, 2003. View at Publisher · View at Google Scholar · View at Scopus
  25. D. Petruzzelli, R. Passino, and G. Tiravanti, “Ion exchange process for chromium removal and recovery from tannery wastes,” Industrial and Engineering Chemistry Research, vol. 34, no. 8, pp. 2612–2617, 1995. View at Publisher · View at Google Scholar · View at Scopus
  26. C. A. Kozlowski and W. Walkowiak, “Removal of chromium(VI) from aqueous solutions by polymer inclusion membranes,” Water Research, vol. 36, no. 19, pp. 4870–4876, 2002. View at Publisher · View at Google Scholar · View at Scopus
  27. H. F. Shaalan, M. H. Sorour, and S. R. Tewfik, “Simulation and optimization of a membrane system for chromium recovery from tanning wastes,” Desalination, vol. 141, no. 3, pp. 315–324, 2001. View at Publisher · View at Google Scholar · View at Scopus
  28. Ihsanullah, A. Abbas, A. M. Al-Amer et al., “Heavy metal removal from aqueous solution by advanced carbon nanotubes: critical review of adsorption applications,” Separation and Purification Technology, vol. 157, pp. 141–161, 2016. View at Publisher · View at Google Scholar · View at Scopus
  29. L. Monser and N. Adhoum, “Modified activated carbon for the removal of copper, zinc, chromium and cyanide from wastewater,” Separation and Purification Technology, vol. 26, no. 2-3, pp. 137–146, 2002. View at Publisher · View at Google Scholar · View at Scopus
  30. D. Park, Y.-S. Yun, J. Y. Kim, and J. M. Park, “How to study Cr(VI) biosorption: use of fermentation waste for detoxifying Cr(VI) in aqueous solution,” Chemical Engineering Journal, vol. 136, no. 2-3, pp. 173–179, 2008. View at Publisher · View at Google Scholar · View at Scopus
  31. M. Ulmanu, E. Marañón, Y. Fernández, L. Castrillón, I. Anger, and D. Dumitriu, “Removal of copper and cadmium ions from diluted aqueous solutions by low cost and waste material adsorbents,” Water, Air, and Soil Pollution, vol. 142, no. 1–4, pp. 357–373, 2003. View at Publisher · View at Google Scholar · View at Scopus
  32. M. Aliabadi, K. Morshedzadeh, and H. Soheyli, “Removal of hexavalent chromium from aqueous solution by lignocellulosic solid wastes,” International Journal of Environmental Science and Technology, vol. 3, no. 3, pp. 321–325, 2006. View at Publisher · View at Google Scholar · View at Scopus
  33. V. K. Singh and P. N. Tiwari, “Removal and recovery of chromium (VI) from industrial waste water,” Journal of Chemical Technology and Biotechnology, vol. 69, no. 3, pp. 376–382, 1997. View at Publisher · View at Google Scholar · View at Scopus
  34. S. K. Srivastava, R. Tyagi, and N. Pant, “Adsorption of heavy metal ions on carbonaceous material developed from the waste slurry generated in local fertilizer plants,” Water Research, vol. 23, no. 9, pp. 1161–1165, 1989. View at Publisher · View at Google Scholar · View at Scopus
  35. E. Demirbas, M. Kobya, E. Senturk, and T. Ozkan, “Adsorption kinetics for the removal of chromium (VI) from aqueous solutions on the activated carbons prepared from agricultural wastes,” Water SA, vol. 30, no. 4, pp. 533–539, 2004. View at Publisher · View at Google Scholar · View at Scopus
  36. D. D. Das, R. Mahapatra, J. Pradhan, S. N. Das, and R. S. Thakur, “Removal of Cr(VI) from aqueous solution using activated cow dung carbon,” Journal of Colloid and Interface Science, vol. 232, no. 2, pp. 235–240, 2000. View at Publisher · View at Google Scholar · View at Scopus
  37. S. Bosinco, J. Roussy, E. P. Guibal, and P. L. Cloirec, “Interaction mechanisms between hexavalent chromium and corncob,” Environmental Technology, vol. 17, no. 1, pp. 55–62, 1996. View at Publisher · View at Google Scholar · View at Scopus
  38. P. Candela, J. M. M. Martinez, and R. T. Macia, “Chromium(VI) removal with activated carbons,” Water Research, vol. 29, pp. 2174–2180, 1995. View at Google Scholar
  39. A. M. El-Kamash, A. A. Zaki, and M. A. El Geleel, “Modeling batch kinetics and thermodynamics of zinc and cadmium ions removal from waste solutions using synthetic zeolite A,” Journal of Hazardous Materials, vol. 127, no. 1–3, pp. 211–220, 2005. View at Publisher · View at Google Scholar · View at Scopus
  40. G. Cimino, A. Passerini, and G. Toscano, “Removal of toxic cations and Cr(VI) from aqueous solution by hazelnut shell,” Water Research, vol. 34, no. 11, pp. 2955–2962, 2000. View at Publisher · View at Google Scholar · View at Scopus
  41. M. Kobya, “Adsorption, kinetic and equilibrium studies of Cr(VI) by hazelnut shell activated carbon,” Adsorption Science and Technology, vol. 22, no. 1, pp. 51–64, 2004. View at Publisher · View at Google Scholar · View at Scopus
  42. K. K. Singh, R. Rastogi, and S. H. Hasan, “Removal of cadmium from wastewater using agricultural waste ‘rice polish’,” Journal of Hazardous Materials, vol. 121, no. 1–3, pp. 51–58, 2005. View at Publisher · View at Google Scholar · View at Scopus
  43. D. C. Sharma and C. F. Forster, “Removal of hexavalent chromium using sphagnum moss peat,” Water Research, vol. 27, no. 7, pp. 1201–1208, 1993. View at Publisher · View at Google Scholar · View at Scopus
  44. S. H. Lee, C. H. Jung, H. Chung, M. Y. Lee, and J.-W. Yang, “Removal of heavy metals from aqueous solution by apple residues,” Process Biochemistry, vol. 33, no. 2, pp. 205–211, 1998. View at Publisher · View at Google Scholar · View at Scopus
  45. C. K. Lee, K. S. Low, and K. L. Kek, “Removal of chromium from aqueous solution,” Bioresource Technology, vol. 54, no. 2, pp. 183–189, 1995. View at Publisher · View at Google Scholar · View at Scopus
  46. K. S. Low, C. K. Lee, and A. Y. Ng, “Column study on the sorption of Cr(VI) using quaternized rice hulls,” Bioresource Technology, vol. 68, no. 2, pp. 205–208, 1999. View at Publisher · View at Google Scholar · View at Scopus
  47. W. Jianlong, “Removal of Cr(VI) from aqueous solution by coal flyash adsorption I: characteristics of chromium adsorption on flyash,” Toxicological and Environmental Chemistry, vol. 68, no. 1-2, pp. 53–62, 1999. View at Publisher · View at Google Scholar · View at Scopus
  48. M. Dakiky, M. Khamis, A. Manassra, and M. Mer'eb, “Selective adsorption of chromium(VI) in industrial wastewater using low-cost abundantly available adsorbents,” Advances in Environmental Research, vol. 6, no. 4, pp. 533–540, 2002. View at Publisher · View at Google Scholar · View at Scopus
  49. N. K. Hamadi, X. D. Chen, M. M. Farid, and M. G. Q. Lu, “Adsorption kinetics for the removal of chromium(VI) from aqueous solution by adsorbents derived from used tyres and sawdust,” Chemical Engineering Journal, vol. 84, no. 2, pp. 95–105, 2001. View at Publisher · View at Google Scholar · View at Scopus
  50. K. Selvi, S. Pattabhi, and K. Kadirvelu, “Removal of Cr(VI) from aqueous solution by adsorption onto activated carbon,” Bioresource Technology, vol. 80, no. 1, pp. 87–89, 2001. View at Publisher · View at Google Scholar · View at Scopus
  51. S. S. Shukla, J. Y. Li, K. L. Dorris, and A. Shukla, “Removal of nickel from aqueous solutions by sawdust,” Journal of Hazardous Materials, vol. 121, no. 1–3, pp. 243–246, 2005. View at Publisher · View at Google Scholar · View at Scopus
  52. C. Selomulya, V. Meeyoo, and R. Amal, “Mechanisms of Cr(VI) removal from water by various types of activated carbons,” Journal of Chemical Technology and Biotechnology, vol. 74, no. 2, pp. 111–122, 1999. View at Publisher · View at Google Scholar · View at Scopus
  53. H. Farrah and W. F. Pickering, “The sorption of lead and cadmium species by clay minerals,” Australian Journal of Chemistry, vol. 30, no. 7, pp. 1417–1422, 1977. View at Publisher · View at Google Scholar · View at Scopus
  54. W. T. Tan, S. T. Ooi, and C. K. Lee, “Removal of chromium(VI) from solution by coconut husk and palm pressed fibres,” Environmental Technology, vol. 14, no. 3, pp. 277–282, 1993. View at Publisher · View at Google Scholar · View at Scopus
  55. K. Periasamy, K. Srinivasan, and P. R. Muruganan, “Studies on chromium(VI) removal by activated ground nut husk carbon,” Indian Journal of Environmental Health, vol. 33, pp. 433–439, 1991. View at Google Scholar
  56. M. S. Mansour, M. E. Ossman, and H. A. Farag, “Removal of Cd (II) ion from waste water by adsorption onto polyaniline coated on sawdust,” Desalination, vol. 272, no. 1–3, pp. 301–305, 2011. View at Publisher · View at Google Scholar · View at Scopus
  57. M. Ayoma, T. Sugiyama, S. Doi, N. S. Cho, and H. E. Kim, “Removal of Hexavalent chromium from dilute aqueous solution by coniferous leaves,” Holzforschung, vol. 53, no. 4, pp. 365–368, 1999. View at Google Scholar
  58. D. C. Sharma and C. F. Forster, “The treatment of chromium wastewaters using the sorptive potential of leaf mould,” Bioresource Technology, vol. 49, no. 1, pp. 31–40, 1994. View at Publisher · View at Google Scholar · View at Scopus
  59. L. Dupont and E. Guillon, “Removal of hexavalent chromium with a lignocellulosic substrate extracted from wheat bran,” Environmental Science and Technology, vol. 37, no. 18, pp. 4235–4241, 2003. View at Publisher · View at Google Scholar · View at Scopus
  60. Z. Reddad, C. Gerente, Y. Andres, and P. Le Cloirec, “Adsorption of several metal ions onto a low-cost biosorbent: kinetic and equilibrium studies,” Environmental Science and Technology, vol. 36, no. 9, pp. 2067–2073, 2002. View at Publisher · View at Google Scholar · View at Scopus
  61. A. C. A. Da Costa and F. P. De França, “Cadmium uptake by biosorbent seaweeds: adsorption isotherms and some process conditions,” Separation Science and Technology, vol. 31, no. 17, pp. 2373–2393, 1996. View at Publisher · View at Google Scholar · View at Scopus
  62. Y. Nakano, M. Tanaka, Y. Nakamura, and M. Konno, “Removal and recovery system of hexavalent chromium from waste water by tannin gel particles,” Journal of Chemical Engineering of Japan, vol. 33, no. 5, pp. 747–752, 2000. View at Publisher · View at Google Scholar · View at Scopus
  63. D. Kratochvil, P. Pimentel, and B. Volesky, “Removal of trivalent and hexavalent chromium by seaweed biosorbent,” Environmental Science and Technology, vol. 32, no. 18, pp. 2693–2698, 1998. View at Publisher · View at Google Scholar · View at Scopus
  64. M. E. A. Ali, “Synthesis and adsorption properties of chitosan-CDTA-GO nanocomposite for removal of hexavalent chromium from aqueous solutions,” Arabian Journal of Chemistry, In press. View at Publisher · View at Google Scholar
  65. N. Calace, A. Di Muro, E. Nardi, B. M. Petronio, and M. Pietroletti, “Adsorption isotherms for describing heavy-metal retention in paper mill sludges,” Industrial and Engineering Chemistry Research, vol. 41, no. 22, pp. 5491–5497, 2002. View at Publisher · View at Google Scholar · View at Scopus
  66. C.-H. Weng, C. P. Huang, H. E. Allen, and P. F. Sanders, “Cr(VI) adsorption onto hydrous concrete particles from groundwater,” Journal of Environmental Engineering, vol. 127, no. 12, pp. 1124–1131, 2001. View at Publisher · View at Google Scholar · View at Scopus
  67. S. S. Ahluwalia and D. Goyal, “Removal of heavy metals by waste tea leaves from aqueous solution,” Engineering in Life Sciences, vol. 5, no. 2, pp. 158–162, 2005. View at Publisher · View at Google Scholar · View at Scopus
  68. V. Sarin and K. K. Pant, “Removal of chromium from industrial waste by using eucalyptus bark,” Bioresource Technology, vol. 97, no. 1, pp. 15–20, 2006. View at Publisher · View at Google Scholar · View at Scopus
  69. M. H. Dehghani, D. Sanaei, I. Ali, and A. Bhatnagar, “Removal of chromium(VI) from aqueous solution using treated waste newspaper as a low-cost adsorbent: kinetic modeling and isotherm studies,” Journal of Molecular Liquids, vol. 215, pp. 671–679, 2016. View at Publisher · View at Google Scholar · View at Scopus
  70. A. S. K. Kumar, S. S. Kakan, and N. Rajesh, “A novel amine impregnated graphene oxide adsorbent for the removal of hexavalent chromium,” Chemical Engineering Journal, vol. 230, pp. 328–337, 2013. View at Publisher · View at Google Scholar · View at Scopus
  71. Ihsanullah, F. A. Al-Khaldi, B. Abusharkh et al., “Adsorptive removal of cadmium(II) ions from liquid phase using acid modified carbon-based adsorbents,” Journal of Molecular Liquids, vol. 204, pp. 255–263, 2015. View at Publisher · View at Google Scholar · View at Scopus
  72. Ihsanullah, H. A. Asmaly, T. A. Saleh, T. Laoui, V. K. Gupta, and M. A. Atieh, “Enhanced adsorption of phenols from liquids by aluminum oxide/carbon nanotubes: comprehensive study from synthesis to surface properties,” Journal of Molecular Liquids, vol. 206, pp. 176–182, 2015. View at Publisher · View at Google Scholar · View at Scopus
  73. Ihsanullah, F. A. Al-Khaldi, B. Abu-Sharkh et al., “Effect of acid modification on adsorption of hexavalent chromium (Cr(VI)) from aqueous solution by activated carbon and carbon nanotubes,” Desalination and Water Treatment, vol. 57, no. 16, pp. 7232–7244, 2016. View at Publisher · View at Google Scholar · View at Scopus
  74. H. A. Asmaly, B. Abussaud, Ihsanullah, T. A. Saleh, V. K. Gupta, and M. A. Atieh, “Ferric oxide nanoparticles decorated carbon nanotubes and carbon nanofibers: from synthesis to enhanced removal of phenol,” Journal of Saudi Chemical Society, vol. 19, no. 5, pp. 511–520, 2015. View at Publisher · View at Google Scholar · View at Scopus
  75. H. A. Asmaly, B. Abussaud, Ihsanullah et al., “Evaluation of micro- and nano-carbon-based adsorbents for the removal of phenol from aqueous solutions,” Toxicological and Environmental Chemistry, vol. 97, no. 9, pp. 1164–1179, 2015. View at Publisher · View at Google Scholar · View at Scopus
  76. A. Abbas, B. A. Abussaud, Ihsanullah, N. A. H. Al-Baghli, M. Khraisheh, and M. A. Atieh, “Benzene removal by iron oxide nanoparticles decorated carbon nanotubes,” Journal of Nanomaterials, vol. 2016, Article ID 5654129, 10 pages, 2016. View at Publisher · View at Google Scholar · View at Scopus
  77. Ihsanullah, A. M. Al Amer, T. Laoui et al., “Fabrication and antifouling behaviour of a carbon nanotube membrane,” Materials and Design, vol. 89, pp. 549–558, 2016. View at Publisher · View at Google Scholar · View at Scopus
  78. J. Zhu, S. Wei, H. Gu et al., “One-pot synthesis of magnetic graphene nanocomposites decorated with core@double-shell nanoparticles for fast chromium removal,” Environmental Science and Technology, vol. 46, no. 2, pp. 977–985, 2012. View at Publisher · View at Google Scholar · View at Scopus
  79. C. J. Lin, S. L. Wang, P. M. Huang et al., “Chromate reduction by zero-valent Al metal as catalyzed by polyoxometalate,” Water Research, vol. 43, no. 20, pp. 5015–5022, 2009. View at Publisher · View at Google Scholar · View at Scopus
  80. J. Hu, C. Chen, X. Zhu, and X. Wang, “Removal of chromium from aqueous solution by using oxidized multiwalled carbon nanotubes,” Journal of Hazardous Materials, vol. 162, no. 2-3, pp. 1542–1550, 2009. View at Publisher · View at Google Scholar · View at Scopus
  81. H. Ding, X. Li, J. Wang, X. Zhang, and C. Chen, “Adsorption of chlorophenols from aqueous solutions by pristine and surface functionalized single-walled carbon nanotubes,” Journal of Environmental Sciences, vol. 43, pp. 187–198, 2016. View at Publisher · View at Google Scholar · View at Scopus