REMOVAL OF CHROMIUM FROM AQUEOUS SOLUTION USING LOCALLY AVAILABLE INEXPENSIVE TARO AND WATER HYACINTH AS BIOSORBENT
In this investigation, locally available and inexpensive Taro and Water Hyacinth were used as biosorbents to remove chromium from synthetic wastewater. The removal of this metal ion from water in the batch and column method have been studied and discussed. Adsorption kinetics and equilibrium isotherm studies were also carried out. The material exhibits good adsorption capacity and the data follow both Freundlich and Langmuir models. Scanning Electronic Microscopic image was also used to understand the surface characteristics of biosorbent before and after biosorption studies. Effects of various factors such as pH, adsorbent dose, adsorbate initial concentration, particle size etc. were analyzed. The initial concentrations of chromium were considered 5-30mgL-1 in batch method and only 4mgL-1 in column method. The maximum chromium adsorbed was 1.64 mgg-1 and 4.44 mgg-1 in Batch method and 1.15 mgg-1 and 0.75 mgg-1 in Column method. Batch and Column desorption and regeneration studies were conducted. Column desorption studies indicated that both of these biosorbents could be reused for removing heavy metals. Results of the laboratory experiments show that the performance of Taro and Water Hyacinth prove that they can effectively be used as low cost biosorbents for the removal of chromium from wastewater.
KEYWORDS: adsorption; chromium removal; Taro; water hyacinth; batch method; column studies
 Gupta VK, Ali I. (2004) Removal of lead and chromium from wastewater using bagasse fly ash—a sugar industry waste. J. Colloid and Interface Sci., 271(2):321-328.
 Moore JW, Subramaniam R. (2012) Heavy metals in natural waters: Applied monitoring and impact assessment. Springer Science & Business Media.
 Waghmare VH, Chaudhari UE. (2014) Removal of hexavalent chromium from aqueous solution by adsorption on commiphora myrrha bark. Rasayan J. Chem., 7(1): 16-19.
 World Health Organization (2004) IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, World Health Organization, and International Agency for Research on Cancer. Betel-quid and Areca-nut Chewing and Some Areca-nut-derived Nitrosamines: IARC Monographs on the Evaluation of Carcinogenic Risks to Human.
 Wing RE, Doane WM, Russell CR. (1975) Insoluble starch xanthate: Use in heavy metal removal. J. App. Pol. Sci., 19(3):847-854.
 Huang CP, Ostavic FG. (1978) Removal of Cadmium (II) by activated carbon. J. Envir. Engrg. ASCE, 104(5):863-873.
 Huang CP, Wirth PK. (1982) Activated carbon for treatment of cadmium wastewater. J. Envir. Engrg. Div., ASCE, 108(6):1280-1299.
 Reed BE, Matsumoto MR. (1993) Modelling Cd adsorption in single and binary adsorbent (PAC) systems. J. Envir. Engrg. Div., ASCE, 119(2):332-348.
 Reed BE, Arunachalam S. (1994) Use of granular carbon columns for lead removal. J. Envir. Engg. Div., ASCE, 120(2):416-436.
 Srivastava SK, Bhattacharjee G, Sharma AK, Oberoi CK. (1980) studies on the use of inorganic gels in the removal of heavy metals. Water Research, 14:113-115.
 Cullen GC, Neil GS. (1982) Removing metals from waste solutions with low rank coals and related materials. Water Research, 16(8):1357-1366.
 Bhattacharya AK, Venkobachar C. (1984) Removal of Cadmium (II) by low cost adsorbents. J. Envir. Engg. ASCE, 110:110-127.
 Jha IN, Iyengar L, Rao. (1988) Removal of Cadmium using chitosan. J. Envir. Engrg. ASCE, 114(4):962-974.
 Chen XH, Gosset T, Thevenot. (1990) Batch copper ion binding and exchange properties of peat. Water Res., 24(12):1463-1470.
 Das NC, Bandyopadhyay M. (1991) Removal of lead by vermiculite medium. App. Clay Sci.. 6(3):221-231.
 Osman MS. (1995) Biosorption of heavy metals from water environment by macro fungi V. volvacea. Ph. D. Thesis, Indian Institute of Technology, Kharagpur, India.
 Martins RJ, Vilar VJ, Boaventura RA. (2010) Removal of Pb (II) from wastewaters by Fontinalis antipyretica biomass: Experimental study and modelling. Desalination and Water Treatment. 20(3):179-188.
 Ashraf MA, Mahmood K, Wajid A, Maah MJ, Yusoff I. (2011) Study of low cost biosorbent for biosorption of heavy metals. Int. Conf. Food Eng. Biotechnology, 9:60-68.
 Rocha LS, Lopes CB, Borges JA, Duarte AC, Pereira E. (2013) Valuation of unmodified rice husk waste as an eco-friendly sorbent to remove mercury: a study using environmental realistic concentrations. Water, Air, & Soil Pollution. 224(7):1-18.
 Milonjić SK, Bošković MR, Ćeranić TS. (1992) Adsorption of uranium (VI) and zirconium (IV) from acid solutions on silica gel. Sep. Sci. Tech., 27(12):1643-1653.
 Nathalie C, Guilet R, Deydier E. (2003) Adsorption of Cu (II) and Pb (II) onto a grafted silica: Isotherms and kinetic models. Water Research, 37(13):3079-3086.
 Pandey PK, Sharma SK, Sambi SS. (2010) Kinetics and equilibrium study of chromium adsorption on zeolite NaX. Int. J. Env. Sci. Tech., 7(2):395-404.
 Foo K, Hameed BH. (2010) Insights into the modeling of adsorption isotherm systems. Chem. Eng. J., 156(1):2-10.
 Rengaraj S, Joo CK, Kim Y, Yi J. (2003) Kinetics of removal of chromium from water and electronic process wastewater by ion exchange resins: 1200H, 1500H and IRN97H. J. Hazardous Mat., 102(2):257-275.
 Allen SJ, Mckay G, Porter JF. (2004) Adsorption isotherm models for basic dye adsorption by peat in single and binary component systems. J. Coll. Interface Sci., 280(2):322-333.
 Demirbas E, Kobya M, Konukman AES. (2008) Error analysis of equilibrium studies for the almond shell activated carbon adsorption of Cr (VI) from aqueous solutions. J. Hazardous Mat., 154(1):787-794.
 Langmuir I. (1918) J. Am. Chem. Soc., 40:1361.
 Weber WJ. (1972) Physicochemical processes for water quality control. Wiley inter science.
 Mohammad A, Rafaqat AKR, Siddiqu BA. (1996) Studies on removal and recovery of Cr (V1) from electroplating waste. Water Research, 30(6):1478-1482.
 Gupta VK, Gupta M, Sharma S. (2001) Process development for the removal of lead and chromium from aqueous solutions using red mud - an aluminum industry waste. Water Research, 35(5):1125-1134.
 Kavak D, Öztürk N. (2004) Adsorption of boron from aqueous solution by sepirolite: II column studies. Illuslrararasi Bor Sempozyumu, 23:495-500.
 Sivakumar P, Palanisamy PN. (2009) Adsorption studies of basic Red 29 by a non-conventional activated carbon prepared from Euphorbia antiquorum L. Int. J. Chem. Tech. Res., 1(3):502-510.
 Othman MR, Lee OR, Fernando WJN. (2006) Gas adsorption and surface diffusion on 5˚A microporous adsorbent in transition and turbulent flow region. IIUM Engineering Journal, 7(1):1-12.
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