1. C.T. Kamala, K.H. Chu, N.S. Chary, P.K. Pandey, S.L. Ramesh, A.R.K. Sastry, K.C. Sekhar, Removal of arsenic (III) from aqueous solutions using fresh and immobilized plant biomass, Water Res., 39 (2005) 2815–2826.
  2. Ö. Gerçel, H.F. Gerçel, Adsorption of lead(II) ions from aqueous solutions by activated carbon prepared from biomass plant material of Euphorbia rigida, Chem. Eng. J., 132 (2007) 289–297.
  3. M.A. Barakat, New trends in removing heavy metals from industrial wastewater, Arab. J. Chem., 4 (2011) 361–377.
  4. O.E. Abdel Salam, N.A. Reiad, M.M. ElShafei, A study of the removal characteristics of heavy metals from wastewater by low-cost adsorbents, J. Adv. Res., 2 (2011) 297–303.
  5. C. Namasivayam, K. Ranganathan, Removal of Pb (II), Cd (II), Ni (II) and mixture of metal ions by adsorption onto ‘ Waste ’ Fe (III)/ Cr (III) hydroxide and fixed bed studies, Environ. Technol., 16 (2010) 851–860.
  6. B.E. Susan, O.J. Trudy, R.M. Bricka, D.D. Adrian, A review of potentially low-cost sorbents for heavy metals, Water Res., 33 (1999) 2469–1999.
  7. J.C. Igwe, D.N. Ogunewe, A.A. Abia, Competitive adsorption of Zn (II), Cd (II) AND Pb (II) ions from aqueous and non- aqueous solution by maize cob and husk, African J. Biotechnol., 4 (2005) 1113–1116.
  8. M. Ajmal, R. Ali, K. Rao, R. Ahmad, J. Ahmad, Adsorption studies on Citrus reticulata (fruit peel of orange): removal and recovery of Ni(II) from electroplating wastewater, J. Hazard Mater., 79 (2000) 117–131.
  9. R.R. Bansode, J.N. Losso, W.E. Marshall, R.M. Rao, R.J. Portier, Adsorption of metal ions by pecan shell-based granular activated carbons, Bioresour. Technol., 89 (2003) 115–119.
  10. 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.
  11. S. Babel, T.A. Kurniawan, Cr (VI) removal from synthetic wastewater using coconut shell charcoal and commercial activated carbon modified with oxidizing agents and / or chitosan, Chemosphere, 54 (2004) 951–967.
  12. P.L. Tang, C.K. Lee, K.S. Low, Z. Zainal, Sorption of Cr (VI) and Cu (II) in aqueous solution by ethylenediamine modified rce hull, Environ. Technol., 24 (2012) 1243–1251.
  13. M. Momcilovic, M. Purenovi, A. Boji, A. Zarubica, M. Ran, Removal of lead (II) ions from aqueous solutions by adsorption onto pine cone activated carbon, Desalination, 276 (2011) 53–59.
  14. E. Demirbas, N. Dizge, M.T. Sulak, M. Kobya, Adsorption kinetics and equilibrium of copper from aqueous solutions using hazelnut shell activated carbon, Chem. Eng. J., 148 (2009) 480–487.
  15. M.I. Sabela, K. Kunene, S. Kanchi, N.M. Xhakaza, A. Bathinapatla, P. Mdluli, D. Sharma, K. Bisetty, Removal of copper (II) from wastewater using green vegetable waste derived activated carbon: an approach to equilibrium and kinetic study, Arab. J. Chem., 12 (2019) 4331–4339
  16. M.M. Rao, D.K. Ramana, K. Seshaiah, M.C. Wang, S.W.C. Chien, Removal of some metal ions by activated carbon prepared from Phaseolus aureus hulls, J. Hazard. Mater., 166 (2009) 1006–1013.
  17. X. Chen, G. Chen, L. Chen, Y. Chen, J. Lehmann, M.B. Mcbride, A.G. Hay, Adsorption of copper and zinc by biochars produced from pyrolysis of hardwood and corn straw in aqueous solution, Bioresour. Technol., 102 (2011) 8877–8884.
  18. L. Wang, J. Zhang, R. Zhao, Y. Li, C. Li, C. Zhang, Adsorption of Pb (II) on activated carbon prepared from Polygonum orientale Linn.: kinetics, isotherms, pH, and ionic strength studies, Bioresour. Technol., 101 (2010) 5808–5814.
  19. M. Valix, W.H. Cheung, K. Zhang, Role of heteroatoms in activated carbon for removal of hexavalent chromium from wastewaters, J. Hazard. Mater., 135 (2006) 395–405.
  20. G. Mahajan, D. Sud, Modified agricultural waste biomass with enhanced responsive properties for metal-ion remediation : a green approach, Appl. Water Sci., 2 (2012) 299–308.
  21. V. Sarin, K.K. Pant, Removal of chromium from industrial waste by using eucalyptus bark, Bioresour. Technol., 97 (2006) 15–20.
  22. H. Jalayeri, F. Pepe, Novel and high-performance biochar derived from pistachio green hull biomass: production, characterization, and application to Cu(II) removal from aqueous solutions, Ecotoxicol. Environ. Saf., 168 (2019) 64–71.
  23. J. Acharya, U. Kumar, B.C. Meikap, Thermodynamic spectral and kinetic analysis of the removal of Cu(II) from aqueous solution by sodium carbonate treated rice husk, J. Environ. Sci. Health Part A, 54 (2019) 1–9.
  24. M. Manjuladevi, R. Anitha, S. Manonmani, Kinetic study on adsorption of Cr(VI), Ni(II), Cd(II) and Pb(II) ions from aqueous solutions using activated carbon prepared from Cucumis melo peel, Appl. Water Sci., 8 (2018) 1–8.
  25. V. Yadav, D.P. Tiwari, M. Bhagat, Arsenic removal using chemically modified Kigelia africana as a low-cost bio- adsorbent: equilibrium, kinetics and thermodynamics studies, Int. J. Basic Appl. Res., 9 (2019) 1282–1294.
  26. G.V.S.R. Pavan Kumar, K.A. Malla, B. Yerra, K. Srinivasa Rao, Removal of Cu(II) using three low-cost adsorbents and prediction of adsorption using artificial neural networks, Appl. Water Sci., 9 (2019) 1–9.
  27. H.S. Mohamed, N.K. Soliman, D.A. Abdelrheem, A.A. Ramadan, A.H. Elghandour, S.A. Ahmed, Adsorption of Cd2+ and Cr3+ ions from aqueous solutions by using residue of Padina gymnospora waste as promising low-cost adsorbent, Heliyon, 5 (2019) e01287.
  28. J. Guo, W. Sheng, Y. Lin, A. Chong, Adsorption of NH3 onto activated carbon prepared from palm shells impregnated with H2SO4, J. Colloid Interface Sci., 281 (2005) 285–290.
  29. F.S. Mohamed, W.A. Khater, M.R. Mostafa, Characterization and phenols sorptive properties of carbons activated by sulphuric acid, Chem. Eng. J., 116 (2006) 47–52.
  30. C. Suresh, D.H.K. Reddy, Y. Harinath, B.R. Naik, K. Seshaiah, A.V.R. Reddy, Development of wood apple shell (Feronia acidissima) powder biosorbent and its application for the removal of Cd(II) from aqueous solution, Sci. World J., 2014 (2014) 1–8.
  31. D.M. Kailas, K.M. Ejazuddin, Equilibrium, kinetics and diffusion mechanism of Cr(VI) adsorption onto activated carbon derived from wood apple shell, Arab. J. Chem., 10 (2017) 252–260.
  32. S. Dawood, T.K. Sen, C. Phan, Synthesis and characterisation of novel-activated carbon from waste biomass pine cone and its application in the removal of congo red dye from aqueous solution by adsorption, Water. Air. Soil Pollut., 225 (2014) 1818–1834.
  33. U. Osman, G. Unal, K. Hakan, B. Yuksel, Adsorptive removal of Rhodamine B with activated carbon obtained from Okra Wastes, Chem. Eng. Commun., 204 (2017) 772–783.
  34. V. Yadav, P. Kumar, D.P. Tiwari, M. Bhagat, 62%SiO2-32%CaO-6%P2O5 bioglass as adsorbent for the removal of Congo red dye, Int. J. Eng. Technol. Sci. Res., 4 (2017) 364–369.
  35. R. Laus, T.G. Costa, B. Szpoganicz, V.T. Fávere, Adsorption and desorption of Cu(II), Cd(II) and Pb(II) ions using chitosan crosslinked with epichlorohydrin-triphosphate as the adsorbent, J. Hazard. Mater., 183 (2010) 233–241.
  36. M. Shafiee, R. Foroutan, K. Fouladi, M. Ahmadlouydarab, B. Ramavandi, S. Sahebi, Application of oak powder/Fe3O4 magnetic composite in toxic metals removal from aqueous solutions, Adv. Powder Technol., 30 (2019) 544–554.
  37. R.M.M. dos Santos, R.G.L. Gonçalves, V.R.L. Constantino, C.V. Santilli, P.D. Borges, J. Tronto, F.G. Pinto, Adsorption of Acid Yellow 42 dye on calcined layered double hydroxide: effect of time, concentration, pH and temperature, Appl. Clay Sci., 140 (2017) 132–139.
  38. H.N. Tran, S.J. You, H.P. Chao, Thermodynamic parameters of cadmium adsorption onto orange peel calculated from various methods: a comparison study, J. Environ. Chem. Eng., 4 (2016) 2671–2682.
  39. N. Feng, X. Guo, Liang sha, adsorption study of copper (II) by chemically modified orange peel, J. Hazard. Mater., 164 (2009) 1286–1292.
  40. A. Florido, C. Valderrama, J.A. Arévalo, I. Casas, M. Martínez, N. Miralles, Application of two sites non-equilibrium sorption model for the removal of Cu(II) onto grape stalk wastes in a fixed-bed column, Chem. Eng. J., 156 (2010) 298–304.
  41. V. Yadav, D.P. Tiwari, M. Bhagat, Activated Carbon of Kigelia africana as bio-adsorbent: synthesis and characterization, Int. J. Res. Anal. Rev., 6 (2019) 958–964.
  42. Ş. Parlayici, E. Pehlivan, Comparative study of Cr(VI) removal by bio-waste adsorbents: equilibrium, kinetics, and thermodynamic, J. Anal. Sci. Technol., 10 (2019) 1–8.
  43. W. Pranata Putra, A. Kamari, S. Najiah Mohd Yusoff, C. Fauziah Ishak, A. Mohamed, N. Hashim, I. Md Isa, Biosorption of Cu(II), Pb(II) and Zn(II) ions from aqueous solutions using selected Waste materials: adsorption and characterisation studies, J. Encapsulation Adsorpt. Sci., 4 (2014) 25–35.
  44. S. Yao, S. Sun, S. Wang, Z. Shi, Adsorptive removal of lead ion from aqueous solution by activated carbon/iron oxide magnetic composite, Indian J. Chem. Technol., 23 (2016) 146–152.
  45. L.J. Yu, S.S. Shukla, K.L. Dorris, A. Shukla, J.L. Margrave, Adsorption of chromium from aqueous solutions by maple sawdust, J. Hazard. Mater., 100 (2003) 53–63.
  46. V. Yadav, Tiwari, D.P.M. Bhagat, Removal of Congo Red dye from aqueous solution by using Limonia acidissima shell as adsorbent, Asian J. Chem., 30 (2018) 2765–2770.
  47. J. Ndi Nsami, J. Ketcha Mbadcam, The adsorption efficiency of chemically prepared activated carbon from cola nut shells by ZnCl2 on methylene blue, J. Chem., 2013 (2013) 1–3.
  48. A. Dada, A. Olalekan, A. Olatunya, O. DADA, Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms studies of equilibrium sorption of Zn2+ unto phosphoric acid modified rice husk, IOSR J. Appl. Chem., 3 (2012) 38–45.
  49. A. N, A. T. Ekubo, D.Wankasi, E.D. Dikio, Adsorption of congo red by Ni/Al-CO3: equilibrium, thermodynamic and kinetic studies, Orient. J. Chem., 31 (2015) 1307–1318.
  50. S.A. Olawale, A.W. Funke, A.H. Dede, A. Habeeb, Isotherm studies of the biosorption of Pb (II) and Cu (II) using chicken feather, Asian J. Adv. Res. Rep., 1 (2018) 1–9.
  51. M. Küçükosmanogˇlu, O. Gezici, A. Ayar, The adsorption behaviors of Methylene Blue and Methyl Orange in a diaminoethane sporopollenin-mediated column system, Sep. Purif. Technol., 52 (2006) 280–287.
  52. H. Dumrul, A.N. Kursunlu, O. Kocyigit, E. Guler, S. Ertul, Adsorptive removal of Cu(II) and Ni(II) ions from aqueous media by chemical immobilization of three different aldehydes, Desalination, 271 (2011) 92–99.
  53. Z. Harrache, M. Abbas, T. Aksil, M. Trari, Thermodynamic and kinetics studies on adsorption of Indigo Carmine from aqueous solution by activated carbon, Microchem. J., 144 (2019) 180–189.
  54. A. Sari, M. Tuzen, Kinetic and equilibrium studies of biosorption of Pb(II) and Cd(II) from aqueous solution by macrofungus (Amanita rubescens) biomass, J. Hazard. Mater., 164 (2009) 1004–1011.
  55. H. Esmaeili, R. Foroutan, Adsorptive behavior of methylene blue onto sawdust of sour lemon, date palm, and eucalyptus as agricultural wastes, J. Dispers. Sci. Technol., 40 (2019) 990–999.
  56. R. Foroutan, R. Mohammadi, S. Farjadfard, H. Esmaeili, M. Saberi, S. Sahebi, S. Dobaradaran, B. Ramavandi, Characteristics and performance of Cd, Ni, and Pb bio-adsorption using Callinectes sapidus biomass: real wastewater treatment, Environ. Sci. Pollut. Res., 26 (2019) 6336–6347.
  57. N. Behrouz, F. Rauf, A. Bahram, R. Farzaneh, S. Bahman, Pb(II) and Cd(II) removal from aqueous solution, shipyard wastewater, and landfill leachate by modified rhizopus oryzae biomass, Mater. Res. Express, 5 (2018) 0–30.
  58. K.C. Bedin, A.C. Martins, A.L. Cazetta, O. Pezoti, V.C. Almeida, KOH-activated carbon prepared from sucrose spherical carbon: adsorption equilibrium, kinetic and thermodynamic studies for Methylene Blue removal, Chem. Eng. J., 286 (2016) 476–484.
  59. B. Mohebbrad, Z. Bonyadi, A.A. Dehghan, M.H. Rahmat, Arsenic removal from aqueous solutions using Saccharomyces cerevisiae: kinetic and equilibrium study, Environ. Prog. Sustain. Energy, 38 (2019) 398–402.
  60. K.M. Nguyen, B.Q. Nguyen, H.T. Nguyen, H.T.H. Nguyen, Adsorption of arsenic and heavy metals from solutions by unmodified iron-ore sludge, Appl. Sci., 619 (2019) 1–14.
  61. T. Budinova, N. Petrov, M. Razvigorova, J. Parra, P. Galiatsatou, Removal of arsenic (III) from aqueous solution by activated carbons prepared from solvent extracted olive pulp and olive stones, Ind. Eng. Chem. Resour., 45 (2006) 1896–1901.
  62. Q. Chang, W. Lin, W. Ying, Preparation of iron-impregnated granular activated carbon for arsenic removal from drinking water, J. Hazard. Mater., 184 (2010) 515–522.
  63. J. Nikić, J. Agbaba, M.A. Watson, A. Tubić, M. Šolić, S. Maletić, B. Dalmacija, Arsenic adsorption on Fe–Mn modified granular activated carbon (GAC–FeMn): batch and fixed-bed column studies, J. Environ. Sci. Health Part A, 54 (2019) 168–178.
  64. D. Mohan, C.U. Pittman, M. Bricka, F. Smith, B. Yancey, Sorption of arsenic, cadmium, and lead by chars produced from fast pyrolysis of wood and bark during bio-oil production, J. Colloid Interface Sci., 310 (2007) 57–73.
  65. L. Lin, G. Zhang, X. Liu, Z.H. Khan, W. Qiu, Z. Song, Synthesis and adsorption of Fe–Mn–La-impregnated biochar composite as an adsorbent for As(III) removal from aqueous solutions, Environ. Pollut., 247 (2019) 128–135
  66. B.C. Nyamunda, T. Chivhanga, U. Guyo, F. Chigondo, Removal of Zn (II) and Cu (II) ions from industrial wastewaters using magnetic biochar derived from water hyacinth, J. Eng. (USA), 2019 (2019) 1–11.
  67. X. Zhang, S. Guo, J. Liu, Z. Zhang, K. Song, C. Tan, H. Li, A study on the removal of copper (II) from aqueous solution using lime sand bricks, Appl. Sci., 9 (2019) 670.
  68. R.E. Ogali, O. Akaranta, I.B. Obot, Removal of Cu (II) from aqueous solution using coconut (Cocos nucifera L.) coir dust, Sch. Res. Libr., 2 (2010) 60–75.
  69. M. Tchoumou, C.G. Mananga, C.P.B. Malongo, Removal of copper (II) and nickel (II) from aqueous solution by adsorption on sugarcane bagasse, Int. Res. J. Environ. Sci., 4 (2015) 62–67.
  70. Y. Song, A. Kong, Y. Ji, B. He, H. Wang, J. Li, Adsorption for copper(II) ion with chitosan-SP/PET composite adsorbent enhanced by electric field, Adsorpt. Sci. Technol., 37 (2019) 274–287.
  71. E.A. Deliyanni, G.Z. Kyzas, K.S. Triantafyllidis, K.A. Matis, Activated carbons for the removal of heavy metal ions: a systematic review of recent literature focused on lead and arsenic ions, Open Chem., 13 (2015) 699–708.
  72. W. Chen, R. Parette, J. Zou, F.S. Cannon, B.A. Dempsey, Arsenic removal by iron-modified activated carbon, Water Res., 41 (2007) 1851–1858.
  73. S. Mandal, M.K. Sahu, R. Kishore, Adsorption studies of arsenic (III) removal from water by zirconium polyacrylamide hybrid material (ZrPACM-43), Water Resour. Ind., 4 (2013) 51–67.