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Removal of toxic Congo red dye from water employing low-cost coconut residual fiber.

Rani, K. C. and Aduja, Naik and Ram Saran, Chaurasiya and Raghavarao, K. S. M. S. (2017) Removal of toxic Congo red dye from water employing low-cost coconut residual fiber. Water Science & Technology, 75 (9). pp. 2225-2236.

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Water Science and Technology Volume issue 2017 [doi 10.2166%2Fwst.2017.109] Rani, K. C.; Naik, Aduja; Chaurasiya, Ram Saran; Raghavarao, K. -- Removal of toxic Congo red dye from water employing low-c.pdf - Published Version
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The coconut residual fiber (CRF) is the major byproduct obtained during production of virgin coconut oil. Its application as a biosorbent for adsorption of Congo red was investigated. The CRF was subjected to different pretreatments, namely, pressure cooking, hexane treatment, acid treatment and their combinations. The pretreatment of CRF with the combination of hexane, acid, pressure cooking resulted in the highest degree of adsorption. The equilibrium data were analyzed and found to fit best to both Langmuir and Freundlich isotherms. Thermodynamic parameters such as standard free energy (ΔG0 kJ mol�1), standard enthalpy (ΔH0, kJ mol�1) and standard entropy (ΔS0, kJ mol�1 K�1) of the systems were calculated by using Langmuir constant. The ΔG0, ΔH0 and ΔS0 were found to be 16.51 kJ mol�1, �19.39 kJ mol�1 and �0.12 kJ mol�1 K�1, respectively at 300 K. These thermodynamic parameters suggest the present adsorption process to be non-spontaneous and exothermic. The adsorption process was observed to follow pseudo-second order kinetics. The results suggest that CRF has potential to be a biosorbent for the removal of hazardous material (Congo red dye) with maximum adsorption capacity of 128.94 mg g�1 at 300 K.

Item Type: Article
Uncontrolled Keywords: adsorption, adsorption kinetics, coconut residual fiber, Congo red, thermodynamic, waste water treatment
Subjects: 600 Technology > 08 Food technology > 16 Nutritive value > 07 Waste utilization
600 Technology > 08 Food technology > 33 Nuts > 01 Coconut
Divisions: Food Engineering
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 07 Feb 2019 04:36
Last Modified: 07 Feb 2019 04:36
URI: http://ir.cftri.com/id/eprint/13940

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