References

  1. W.J. Patterson, Wastewater Treatment Technology, Ann Arbor Science, Michigan, 1975.
  2. R.D. Cassidy, A. Furr, Toxicity of Heavy Metals in the Environment, Part 1, F.W. Oehme, Ed., Marcel Dekker, New York, 1978.
  3. U.S.E.P.A., Mercury Study Report to Congress, EPA- 425/R-97-006, Office of Air Quality Planning & Standards and Office of Research and Development, 1997.
  4. F. Zahir, S.J. Rizwi, S.K. Haq, R.H. Khan, Low dose mercury toxicity and human health, Environ. Toxicol. Pharmacol., 20 (2005) 351–360.
  5. U.N.E.P. Chemicals, Global Mercury Assessment, Report no. 54790-01, Geneva, 2002.
  6. J.M. Hammer, Water and Waste-Water Technology, Wiley, New York, 1975.
  7. A. Pamalho, Introduction to Wastewater Treatment Processes, Academic Press, London, 1977.
  8. N. Serpone, K. Ah-You, T.P. Tran, R. Harris, AM1 simulated sunlight photoreduction and elimination of Hg(II) and CH3Hg(II) chloride salts from aqueous suspensions of titanium dioxide, Sol. Energy,39 (1987) 491–498.
  9. M.A. Aguado, S. Cervera-March, J. Gimenez, Continuous photocatalytic treatment of mercury(II) on titania powders: kinetics and catalyst activity, Chem. Eng. Sci., 50 (1995) 1561–1569.
  10. S.G. Botta, D.J. Rodriguez, A.G. Leyva, M.I. Litter, Features of the transformation of Hg-II by heterogeneous photocatalysis over TiO2, Catal. Today, 76 (2002) 247–258.
  11. L.B. Khalil, M.W. Rophael, W.E. Mourad, The removal of the toxic Hg(II) salts from water by photocatalysis, Appl. Catal., B, 36 (2002) 125–130.
  12. X. Wang, S.O. Pehkonen, A.K. Ray, Photocatalytic reduction of Hg(II) on two commercial TiO2 catalysts, Electrochim. Acta, 49 (2004) 1435–1444.
  13. U.S.E.P.A., Water Quality Criterion for the Protection of Human Health: Methyl Mercury, EPA-823-R-01-001, Office of Science and Technology and Office of Water, 2001.
  14. J. Aguado, R. van Grieken, M. Lopex-Munoz, J. Marugan, A comprehensive study of the synthesis, characterization and activity of TiO2 and mixed TiO2/SiO2 photocatalysts, Appl. Catal., A, 312 (2006) 202–212.
  15. C. Anderson, A.J. Bard, Improved photocatalytic activity and characterization of mixed TiO2/SiO2 and TiO2/Al2O3 materials, J. Phys. Chem. B, 101 (1997) 2611–2616.
  16. K.Y. Jung, S.B. Park, Enhanced photoactivity of silica-embedded titania particles prepared by sol–gel process for the decomposition of trichloroethylene, Appl. Catal., B, 25 (2000) 249–256.
  17. P. Pucher, M. Benmami, R. Azouani, G. Krammer, K. Chhor, J.F. Bocquet, A.V. Kanaev, Nano-TiO2 sols immobilized on porous silica as new efficient photocatalyst, Appl. Catal., A, 332 (2007) 297–303.
  18. E. Pitoniak, C.Y. Wu, D. Londeree, D. Mazyck, J.C. Bonzongo, K. Powers, W. Sigmund, Nanostructured silica-gel doped with TiO2 for mercury vapor control, J. Nanopart. Res., 5 (2003) 281–292.
  19. H.E. Byrne, W.L. Kostedt, J.M. Stokke, D.W. Mazyck, Characterization of HF catalyzed silica gels doped with Degussa P25 titanium dioxide, J. Non-Cryst. Solids, 355 (2009) 525–530.
  20. E. Pitoniak, C.Y. Wu, D.Q. Mazyck, K.W. Powers, W. Sigmund, Adsorption enhancement mechanisms of silica–titania nanocomposites for elemental mercury vapor removal, Environ. Sci. Technol., 39 (2005) 1269–1274.
  21. J.M. Stokke, D.W. Mazyck, Development of a regenerable system employing silica–titania composites for the recovery of mercury from end-box exhaust at a chlor-alkali facility, J. Air Waste Manage. Assoc., 58 (2008) 530–537.
  22. J.M. Stokke, D.W. Mazyck, C.Y. Wu, R. Sheahan, Photocatalytic oxidation of methanol using silica–titania composites in a packed-bed reactor, Environ. Prog., 25 (2006) 312–318.
  23. J.L. Parker, N.S. Bloom, Preservation and storage techniques for low-level aqueous mercury speciation, Sci. Total Environ., 337 (2005) 253–263.
  24. A. Kanta, R. Sedev, J. Ralston, Thermally and photoinduced changes in the water wettability of low-surface-area silica and titania, Langmuir, 21 (2005) 2400–2407.
  25. A. Kanta, R. Sedev, J. Ralston, Preparation of silica-on-titania patterns with a wettability contrast, Langmuir, 21 (2005) 5790–5794.
  26. H. Zhang, Photochemical redox reactions of mercury, Struct. Bond., 120 (2006) 37–79.
  27. C. Tian, Q. Zhang, A. Wu, M. Jiang, Z. Liang, B. Jiang, H. Fu, Cost-effective large-scale synthesis of ZnO photocatalyst with excellent performance for dye photodegradation, Chem. Commun., 48 (2012) 2858–2860.
  28. B. Li, T. Liu, Y. Wang, Z. Wang, ZnO/graphene-oxide nanocomposite with remarkably enhanced visible-lightdriven photocatalytic performance, J. Colloid Interface Sci., 377 (2012)114–121.
  29. A.Y.S. Malkhasian, R.M. Mohamed, Environmental remediation of Cr(VI) solutions by photocatalytic reduction using Ag-Er(OH)3 nanocomposite, J. Alloys Compd., 632 (2015) 735–740.