1. K. Hunger, Industrial Dyes: Chemistry, Properties, Applications, 1st edition. Wiley-VCH, Weinheim, Cambridge, 2003.
  2. M. Rafatullah, O. Sulaiman, R. Hashim, A. Ahmad, Adsorption of methylene blue on low-cost adsorbents: A review, J. Hazard. Mater., 177 (2010) 70–80.
  3. R.I. Schwarzenbach, P.M. Gschwend, D.M. Imboden, Environmental Organic Chemistry Wiley, New York, NY, 1993.
  4. O.J. Hao, H. Kim, P-C. Chiang, Decolorization of wastewater, Crit. Rev. Env. Sci. Technol., 30 (2000) 449–505.
  5. L. Sun, S. Wan, W. Luo, Biochars prepared from anaerobic digestion residue, palm bark, and eucalyptus for adsorption of cationic methylene blue dye: Characterization, equilibrium, and kinetic studies, Bioresource Technol., 140 (2013) 406–413.
  6. S. Banerjee, M.C. Chattopadhyaya, V. Srivastava, Y.C. Sharma, Adsorption studies of methylene blue onto activated saw dust: kinetics, equilibrium, and thermodynamic studies, Environ. Prog. Sust. Energy, 33 (2013) 790–799.
  7. E.S. Dragan, D.F.A. Loghin, Enhanced sorption of methylene blue from aqueous solutions by semi-IPN composite cryogels with anionically modified potato starch entrapped in PAAm matrix, Chem. Eng. J., 234 (2013) 211–222.
  8. L.S. Oliveira, A.S. Franca, T.M. Alves S.D.F. Rocha, Evaluation of untreated coffee husks as potential biosorbents for treatment of dye contaminated waters, J. Hazard. Mater., 155 (2008) 507–512.
  9. V.K. Gupta, R. Kumar, A. Nayak, T.A. Saleh, M.A. Barakat, Adsorptive removal of dyes from aqueous solution onto carbon nanotubes: A review, Adv. Colloid Interface Sci., 193–194 (2013) 24–34.
  10. M. Matouq, Z. Al-Anber, N. Susumu, T. Tagawa, H. Karapanagioti, The kinetic of dyes degradation resulted from food industry in wastewater using high frequency of ultrasound, Sep. Purif. Technol., 135 (2014) 42–47.
  11. G. Karaçetin, S. Sivrikaya, M. Imamoğlu, Adsorption of methylene blue from aqueous solutions by activated carbon prepared from hazelnut husk using zinc chloride, J. Anal. Appl. Pyrolysis., 110 (2014) 270–276.
  12. A. Bhatnagar, M. Sillanpää, Utilization of agro-industrial and municipal waste materials as potential adsorbents for water treatment - A review, Chem. Eng. J., 157 (2010) 277–296.
  13. C. Senthamarai, P.S. Kumar, M. Priyadharshini, P. Vijayalakshmi, V.V. Kumar, P. Baskaralingam, K.V. Thiruvengadaravi, S. Sivanesan, Adsorption behavior of methylene blue dye onto surface modified Strychnos potatorum Seeds, Environ. Prog. Sust. Energy, 32 (2013) 624–632.
  14. L.G. Boutsika, H.K. Karapanagioti, I.D. Manariotis, Aqueous mercury sorption by biochar from malt spent rootlets, Water Air Soil Pollut., 225 (2014) 1805.
  15. Y. Qiu, Z. Zheng, Z. Zhou, G.D. Sheng, Effectiveness and mechanisms of dye adsorption on a straw-based biochar, Biores. Technol., 100 (2009) 5348–5351.
  16. I.D. Manariotis, K.N. Fotopoulou, H.K. Karapanagioti, Detailed characterization of biochar sorbents produced from malt spent rootlets, Ind. Eng. Chem. Res., 54 (2015) 9577–9584.
  17. V.A. Anagnostopoulos, I.D. Manariotis, H.K. Karapanagioti, C.V. Chrysikopoulos, Removal of mercury from aqueous solutions by malt spent rootlets, Chem. Eng. J., 213 (2012) 135– 141.
  18. Y. Xing, S. Li, Biosorption of methylene blue from aqueous solution by poly(amic acid)-modified chitosan, Environ. Prog. Sust. Energy, 33 (2014) 1180–1186.
  19. V. Anagnostopoulos, B. Symeopoulos, K. Bourikas, A. Bekatorou, Biosorption of U(VI) from aqueous systems by malt spent rootlets: kinetic, equilibrium and speciation studies, Int. J. Environ. Sci. Technol., 13(1) (2016), 285–296.
  20. S. Valili, G. Siavalas, H.K. Karapanagioti, I.D. Manariotis, K. Christanis, Phenanthrene removal from aqueous solutions using well-characterized, raw, chemically treated, and charred malt spent rootlets, J. Environ. Manage., 128 (2013) 252–258.
  21. K.M. Lynch, E.J. Steffen, E.K. Arendt, Brewers’ spent grain: a review with an emphasis on food and health, J. Institute Brewing, 122 (2016) 553–568.
  22. ICO, 2016. Last visited May 27, 2017.
  23. S.M. Lamine, C. Ridha, H-M. Mahfoud, C. Mouad, B. Lotfi, A.H. Al-Dujaili, Chemical activation of an activated carbon prepared from coffee residue, Energy Procedia., 50 (2014) 393–400.
  24. N.R. Draper, H. Smith, Applied Regression Analysis (3rd edition). New York: Wiley 1998.
  25. J.B. Willett, J.D. Singer, Another cautionary note about R2: its use in weighted least-squares regression analysis, The American Statistician, 61 (1988) 236–238.
  26. Y.S. Ho, J.C.Y. Ng, G. McKay, Kinetics of pollutants sorption by biosorbents: A review, Sep. Purif. Methods, 29(2) (2000) 189–232.
  27. G. Blanchard, M. Maunaye, G. Martin, Removal of heavy metals from waters by means of natural zeolites, Water Res., 18 (1984) 1501–1507.
  28. Y.-S. Ho, Review of second-order models for adsorption systems, J. Hazard. Mater., B 136 (2006) 681–689.
  29. K.V. Kumar, K. Porkodi, Mass transfer, kinetics and equilibrium studies for the biosorption of methylene blue using Paspalum notatum, J. Hazard. Mater., 146 (2007) 214–226.
  30. N.A. Oladoja, C.O. Aboluwoye, Y.B. Oladimeji, Kinetics and isotherm studies on methylene blue adsorption onto ground palm kernel coat, Turkish J. Eng. Environ. Sci., 32 (2008) 303– 312.
  31. M. Berrios, M.Á. Martín, A. Martín, Treatment of pollutants in wastewater: Adsorption of methylene blue onto olive-based activated carbon, J. Ind. Eng. Chem., 18 (2012) 780–784.
  32. N. Kannan, M.M. Sundaram, Kinetics and mechanism of removal of methylene blue by adsorption on various carbons — a comparative study, Dyes Pigments, 51 (2001) 25–40.
  33. D. Kumar, J.P. Gaur, Chemical reaction- and particle diffusion-based kinetic modeling of metal biosorption by a Phormidium sp.-dominated cyanobacterial mat. Biores. Technol., 102 (2011) 633–640.
  34. G. McKay, The adsorption of dyestuffs from aqueous solution using activated carbon: Analytical solution for batch adsorption based on external mass transfer and pore diffusion, The Chem. Eng. J., 27 (1983) 187–196.
  35. W.J. Weber, J.C. Morris, Kinetics of adsorption on carbon from solution, J. Sanit. Eng. Div., 89 (1963) 31–60.
  36. J. Chen, Y. Cai, M. Clark, Y. Yu, Equilibrium and kinetic studies of phosphate removal from solution onto a hydrothermally modified oyster shell material, PLoS One, 8 (2013) 1–10.
  37. K.G. Bhattacharyya, A. Sharma, Azadirachta indica leaf powder as an effective biosorbent for dyes: A case study with aqueous Congo Red solutions, J. Environ. Manage., 71 (2004) 217–229.
  38. Y.S. Ho, G. McKay, The kinetics of sorption of basic dyes from aqueous solution by sphagnum moss peat, The Canadian J. Chem. Eng., 76 (1998) 822–827.
  39. W.H. Cheung, Y.S. Szeto, G. McKay, Intraparticle diffusion processes during acid dye adsorption onto chitosan, Biores. Technol., 98 (2007) 2897–2904.
  40. G.E. Boyd, A.W. Adamson, L.S.Jr. Myers, The exchange adsorption of ions from aqueous solutions by organic zeolites. II. Kinetics, J. Am. Chem. Soc., 69 (1947) 2836–2848.
  41. D. Reichenberg, Properties of ion-exchange resins in relation to their structure. III. Kinetics of exchange, J. Am. Chem. Soc., 75 (1953) 589–597.
  42. G. Annadurai, R.S. Juang, D.J. Lee, Use of cellulose-based wastes for treatment of wastewater contaminated with dye and other organics, Biores. Technol., 92 (2002) 263–274.
  43. G. Mckay, J.F. Porter, G.R. Prasad, The removal of dye colours from aqueous solutions by adsorption on low-cost materials, Water Air Soil Pollut., 114 (1999) 423–438.
  44. S. Afroze, T.K. Sen, M. Ang, H. Nishioka, Adsorption of methylene blue dye from aqueous solution by novel biomass Eucalyptus sheathiana bark: equilibrium, kinetics, thermodynamics and mechanism, Desal. Water Treat., 57(13) 2016.
  45. R. Lakshmipathy, N.C. Sarada, Methylene blue adsorption onto native watermelon rind: bath and fixed bed column studies, Desal. Water Treat., 57 (23) 2016.
  46. F. Ferrero, Dye removal by low cost adsorbents: Hazelnut shells in comparison with wood sawdust, J. Hazard. Mater., 142 (2007) 144–152.
  47. G.L. Dotto, J.M. Nascimento dos Santos, R. Rosa, L.A.A. Pinto, F.A. Pavan, E.C. Lima, Fixed bed adsorption of methylene blue by ultrasonic surface modified chitin supported on sand, Chem. Eng. Res. Design., 100 (2015) 302–310.
  48. A.N. Fernandes, C.A.P. Almeida, C.T.B. Menezes, N.A. Debacher, M.M.D. Sierra, Removal of methylene blue from aqueous solution by peat, J. Hazard. Mater., 144 (2007) 412– 419.
  49. S. Senthilkumaar, P.R. Varadarajan, K. Porkodi, C.V. Subbhuraam, Adsorption of methylene blue onto jute fiber carbon: Kinetics and equilibrium studies, J. Colloid Interface Sci., 284 (2005) 78–82.
  50. C.H. Weng, Y.F. Pan, Adsorption of a cationic dye (methylene blue) onto spent activated clay, J. Hazard. Mater., 144 (2007) 355–362.
  51. A.S. Franca, L.S. Oliveira, M.E. Ferreira, Kinetics and equilibrium studies of methylene blue adsorption by spent coffee grounds, Desalination, 249 (2009) 267–272.