References

  1. V.K. Gupta, M. Gupta, S. Sharma, Process development for the removal of lead and chromium from aqueous solutions using red mud—an aluminium industry waste, Water Res., 35 (2001) 1125–1134.
  2. R. Gottipati, S. Mishra, Process optimization of adsorption of Cr (VI) on activated carbons prepared from plant precursors by a two-level full factorial design, Chem. Eng. J., 160 (2010) 99–107.
  3. V. Selen, D. Özer, A. Özer, A study on the removal of Cr (VI) ions by sesame (Sesamum indicum) stems dehydrated with sulfuric acid, Arab. J. Sci. Eng., 39 (2014) 5895–5904.
  4. M. Cieślak–Golonka, Toxic and mutagenic effects of chromium (VI). A review, Polyhedron, 15 (1996) 3667–3689.
  5. R.A. Anderson, Chromium as an essential nutrient for humans, Regul. Toxicol. Pharmacol., 26 (1997) S35–S41.
  6. Z. Kowalski, Treatment of chromic tannery wastes, J. Hazard. Mater., 37 (1994) 137–141.
  7. A.K. Sengupta, D. Clifford, Chromate ion exchange mechanism for cooling water, Ind. Eng. Chem. Fundam., 25 (1986) 249–258.
  8. E.M. Chirwa, Y.–T. Wang, Hexavalent chromium reduction by Bacillus sp. in a packed–bed bioreactor, Environ. Sci. Technol., 31 (1997) 1446–1451.
  9. Y. Ishibashi, C. Cervantes, S. Silver, Chromium reduction in Pseudomonas putida, Appl. Environ. Microbiol., 56 (1990) 2268–2270.
  10. J.I. Khattar, T.A. Sarma, D.P. Singh, A. Sharma, Bioaccumulation of chromium ions by immobilized cells of a filamentous cyanobacterium, Anabaena variabilis, J. Microbiol. Biotechnol., 12 (2002) 137–141.
  11. S. Qaiser, A.R. Saleemi, M. Umar, Biosorption of lead (II) and chromium (VI) on groundnut hull: Equilibrium, kinetics and thermodynamics study, Electron. J. Biotechnol., 12 (2009) 3–4.
  12. A.L. Cazetta, A.M. Vargas, E.M. Nogami, M.H. Kunita, M.R. Guilherme, A.C. Martins, T.L. Silva, J.C. Moraes, V.C. Almeida, NaOH–activated carbon of high surface area produced from coconut shell: Kinetics and equilibrium studies from the methylene blue adsorption, Chem. Eng. J., 174 (2011) 117–125.
  13. C. Theivarasu, S. Mylsamy, N. Sivakumar, Cocoa shell as adsorbent for the removal of Methylene Blue from aqueous solution: kinetic and equilibrium study, Univ. J. Environ. Res. Technol., 1 (2011).
  14. N.R. Bishnoi, M. Bajaj, N. Sharma, A. Gupta, Adsorption of Cr (VI) on activated rice husk carbon and activated alumina, Bioresour. Technol., 91 (2004) 305–307.
  15. N. Fiol, I. Villaescusa, M. Martínez, N. Miralles, J. Poch, J. Serarols, Sorption of Pb (II), Ni (II), Cu (II) and Cd (II) from aqueous solution by olive stone waste, Sep. Purif. Technol., 50 (2006) 132–140.
  16. J.F. Rumky, Z. Abedin, H. Rahman, A. Hossain, Environmental treatment of dyes: Methyl Orange decolorization using hog plum peel and mix–bacterial str ins, IOSR J. Environ. Sci. Toxicol. Food Technol. (IOSR–JESTTFT), 5 (2013) 19–22.
  17. B. Hameed, A. Ahmad, Batch adsorption of methylene blue from aqueous solution by garlic peel, an agricultural waste biomass, J. Hazard. Mater., 164 (2009) 870–875.
  18. B. Acemioğlu, Adsorption of Congo red from aqueous solution onto calcium–rich fly ash, J. Colloid Interface Sci., 274 (2004) 371–379.
  19. M. Achak, A. Hafidi, N. Ouazzani, S. Sayadi, L. Mandi, Low cost biosorbent “banana peel” for the removal of phenolic compounds from olive mill wastewater: Kinetic and equilibrium studies, J. Hazard. Mater., 166 (2009) 117–125.
  20. J. Egila, B. Dauda, Y. Iyaka, T. Jimoh, Agricultural waste as a low cost adsorbent for heavy metal removal from wastewater, Int. J. Phys. Sci., 6 (2011) 2152–2157.
  21. A. Pal, A.S. Chaudhury, Biosorption of chromium using Anabaena and Vetiveria, Int. J. Pollut. Abat. Technol., 1 (2012) 15–19.
  22. C. Liu, N. Fiol, I. Villaescusa, J. Poch, New approach in modeling Cr(VI) sorption onto biomass from metal binary mixtures solutions, Sci. Total Environ., 541 (2016) 101–108.
  23. M.J. Alam, B.C. Das, M.W. Rahman, B.K. Biswas, M.M.R. Khan, Removal of dark blue–GL from wastewater using water hyacinth: a study of equilibrium adsorption isotherm, Desal. Water. Treat., 56(6) (2015) 1520–1525.
  24. M.M.R. Khan, M.W. Rahman, H.R. Ong, A.B. Ismail, C.K. Cheng, Tea dust as a potential low–cost adsorbent for the removal of crystal violet from aqueous solution, Desal. Water. Treat., 57(31) (2016) 14728–14738.
  25. M.Y. Ali, M.W. Rahman, M. Moniruzzaman, M.J. Alam, I. Saha, M.A. Halim, A. Deb, M.S.A. Sumi, S. Parvin, M.A. Haque, M.M.R. Khan, M. Khan, Nypa fruticans as a potential low cost adsorbent to uptake heavy metals from industrial wastewater, Int. JABER, 14 (2016) 1359–1371.
  26. F. Boudrahem, F. Aissani–Benissad, A. Soualah, Adsorption of lead (II) from aqueous solution by using leaves of date trees as an adsorbent, J. Chem. Eng. Data, 56 (2011) 1804–1812.
  27. S.M. Al–Shayeb, M.A. Al–Rajhi, M.R.D. Seaward, The date palm (Phoenix dactylifera L.) as a biomonitor of lead and other elements in arid environments. Sci. Total Environ., 168 (1995) l–10.
  28. A.L. Al–Khlaifat, O.A. Al–Khashman, Atmospheric heavy metal pollution in Aqaba city, Jordan, using Phoenix dactylifera L. leaves. Atmosp. Environ., 41 (2007) 8891–8897.
  29. A.S. Singha, A. Guleria, R.K. Rana, Adsorption and equilibrium isotherm study of removal of copper(II) ions from aqueous solution by chemically modified Abelmoschus esculentus fibers, Int. J. Polym. Anal. Charact., 18 (2013) 451– 463.
  30. T.S. Anirudhan, B. Noeline, D. Manohar, Phosphate removal from wastewaters using a weak anion exchanger prepared from a lignocellulosic residue, Env. Sci. Technol., 40 (2006) 2740–2745.
  31. M.M.R. Khan, M.W. Rahman, M.S.I. Mozumder, K. Ferdous, H.R. Ong, K.M. Chan, D.M.R. Prasad, Performance of a submerged adsorption column compared with conventional fixedbed adsorption, Desal. Water. Treat., 57(21) (2016) 9705–9717.
  32. K. Foo, B. Hameed, Preparation, characterization and evaluation of adsorptive properties of orange peel based activated carbon via microwave induced K2CO3 activation, Bioresour. Technol., 104 (2012) 679–686.
  33. K. Foo, B. Hameed, Mesoporous activated carbon from wood sawdust by K2CO3 activation using microwave heating, Bioresour. Technol., 111 (2012) 425–432.
  34. Y. Li, B. Zhao, L. Zhang, R. Han, Biosorption of copper ion by natural and modified wheat straw in fixed–bed column, Desal. Water. Treat., 51 (2013) 5735–5745.
  35. A.B. Pérez Marín, M.I. Aguilar, J.F. Ortuño, V.F. Meseguer, J. Sáez, M. Lloréns, Biosorption of Zn (II) by orange waste in batch and packed-bed systems, J. Chem. Technol. Biotechnol., 85 (2010) 1310–1318.
  36. L. Sha, G. Xueyi, F. Ningchuan, T. Qinghua, Adsorption of Cu2+ and Cd2+ from aqueous solution by mercapto–acetic acid modified orange peel, Colloids Surf. B Biointerfaces, 73 (2009) 10–14.
  37. M.A. Al–Ghouti, J. Li, Y. Salamh, N. Al–Laqtah, G. Walker, M.N. Ahmad, Adsorption mechanisms of removing heavy metals and dyes from aqueous solution using date pits solid adsorbent, J. Hazard. Mater., 176 (2010) 510–520.
  38. S. Mandina, F. Chigondo, M. Shumba, B.C. Nyamunda, E. Sebata, Removal of chromium (VI) from aqueous solution using chemically modified orange (citrus cinensis) peel, J. Appl. Chem., 6 (2013) 66–75.
  39. X.-j. Hu, J.-s. Wang, Y.-g. Liu, X. Li, G.-m. Zeng, Z.-l. Bao, X.-x. Zeng, A.-w. Chen, F. Long, Adsorption of chromium (VI) by ethylenediamine–modified cross–linked magnetic chitosan resin: isotherms, kinetics and thermodynamics, J. Hazard. Mater., 185 (2011) 306–314.
  40. X. Yao, S. Deng, R. Wu, S. Hong, B. Wang, J. Huang, Y. Wang, G. Yu, Highly efficient removal of hexavalent chromium from electroplating wastewater using aminated wheat straw, RSC Adv., 6 (2016) 8797–8805.
  41. H. Shen, J. Chen, H. Dai, L. Wang, M. Hu, Q. Xia, New insights into the sorption and detoxification of chromium (VI) by tetraethylenepentamine functionalized nano-sized magnetic polymer adsorbents: Mechanism and pH effect. Ind. Eng. Chem. Res., 52 (2013) 12723−12732.
  42. Y.-G. Zhao, H.-Y. Shen, S.-D. Pan, M.-Q. Hu, Synthesis, characterization and properties of ethylenediamine-functionalized Fe3O4 magnetic polymers for removal of Cr(VI) in wastewater, J. Hazard. Mater., 182 (2010) 295–302.
  43. Y.-G. Zhao, H.-Y. Shen, S.-D. Pan, M.-Q. Hu, Q.-H. Xia, Preparation and characterization of amino-functionalized nano-Fe3O4 magnetic polymer adsorbents for removal of chromium(VI) ions, J. Mater. Sci., 45 (2010) 5291–5301.
  44. T. Karthikeyan, S. Rajgopal, L.R. Miranda, Chromium (VI) adsorption from aqueous solution by Hevea Brasilinesis sawdust activated carbon, J. Hazard. Mater., 124 (2005) 192–199.
  45. A.R. Iftikhar, H.N. Bhatti, M.A. Hanif, R. Nadeem, Kinetic and thermodynamic aspects of Cu (II) and Cr (III) removal from aqueous solutions using rose waste biomass, J. Hazard. Mater., 161 (2009) 941–947.
  46. B. Babu, S. Gupta, Adsorption of Cr (VI) using activated neem leaves: kinetic studies, Adsorption, 14 (2008) 85–92.
  47. C. Huang, M. Wu, The removal of chromium (VI) from dilute aqueous solution by activated carbon, Water Res., 11 (1977) 673–679.
  48. S. Tahir, R. Naseem, Removal of Cr (III) from tannery wastewater by adsorption onto bentonite clay, Sep. Purif. Technol., 53 (2007) 312–321.
  49. W.T. Tan, S. Ooi, C.K. Lee, Removal of chromium (VI) from solution by coconut husk and palm pressed fibres, Environ. Technol., 14 (1993) 277–282.
  50. E. Malkoc, Y. Nuhoglu, Potential of tea factory waste for chromium (VI) removal from aqueous solutions: thermodynamic and kinetic studies, Sep. Purif. Technol., 54 (2007) 291–298.
  51. D. Sharma, C. Forster, A comparison of the sorbtive characteristics of leaf mould and activated carbon columns for the removal of hexavalent chromium, Process Biochem., 31 (1996) 213–218.
  52. M. Dakiky, M. Khamis, A. Manassra, M. Mer'eb, Selective adsorption of chromium (VI) in industrial wastewater using low–cost abundantly available adsorbents, Adv. Environ. Res., 6 (2002) 533–540.
  53. T. Ahmad, M. Danish, M. Rafatullah, A. Ghazali, O. Sulaiman, R. Hashim, M. N. M. Ibrahim, The use of date palm as a potential adsorbent for wastewater treatment: a review, Environ. Sci. Pollut. Res., 19 (2012) 1464–1484.
  54. J.S. Macedo, L. Otubo, O.P. Ferreira, I. de Fátima Gimenez, I.O. Mazali, L.S. Barreto, Biomorphic activated porous carbons with complex microstructures from lignocellulosic residues, Micropor. Mesopor. Mater., 107 (2008) 276–285.
  55. B. Jibril, O. Houache, R. Al-Maamari, B. Al-Rashidi, Effects of H3PO4 and KOH in carbonization of lignocellulosic material, J. Anal. Appl. Pyrolysis, 83 (2008) 151–156.
  56. A. El Nemr, A. Khaled, O. Abdelwahab, A. El-Sikaily, Treatment of wastewater containing toxic chromium using new activated carbon developed from date palm seed, J. Hazard. Mater., 152 (2008) 263–275.
  57. K.K. Krishnani, X. Meng, C. Christodoulatos, V.M. Boddu, Biosorption mechanism of nine different heavy metals onto biomatrix from rice husk, J. Hazard. Mater., 153 (2008) 1222–1234.
  58. A.-N.A. El-Hendawy, The role of surface chemistry and solution pH on the removal of Pb2+ and Cd2+ ions via effective adsorbents from low–cost biomass, J. Hazard. Mater., 167 (2009) 260–267.
  59. F. Banat, S. Al-Asheh, D. Al-Rousan, A Comparative study of copper and zinc ion adsorption on to activated and non–activated date–pits, Adsorp. Sci. Technol., 20 (2002) 319–335.
  60. https://en.wikipedia.org/wiki/Ionic_radius.
  61. F.C. Richard, A.C.M. Bourg, Aqueous geochemistry of chromium: a review, Water Res., 25 (1991) 807–816.
  62. K. Kim, W. Choi, Enhanced redox conversion of chromate and arsenite in ice, Environ. Sci. Technol., 45 (2011) 2202–2208.
  63. A. Demirbas, Heavy metal adsorption onto agro–based waste materials: a review, J. Hazard. Mater., 157 (2008) 220–229.
  64. P. Nobel, Physicochemical and Environmental Plant Physiology. Academic, New York, 1991.