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

IR@CSIR-CFTRI

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Relation http://ir.cftri.com/13940/
https://doi.org/10.2166/wst.2017.109
 
Title Removal of toxic Congo red dye from water employing
low-cost coconut residual fiber.
 
Creator Rani, K. C.
Aduja, Naik
Ram Saran, Chaurasiya
Raghavarao, K. S. M. S.
 
Subject 07 Waste utilization
01 Coconut
 
Description 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.
 
Date 2017
 
Type Article
PeerReviewed
 
Format pdf
 
Language en
 
Identifier http://ir.cftri.com/13940/1/Water%20Science%20and%20Technology%20Volume%20issue%202017%20%5Bdoi%2010.2166%252Fwst.2017.109%5D%20Rani%2C%20K.%20C.%3B%20Naik%2C%20Aduja%3B%20Chaurasiya%2C%20Ram%20Saran%3B%20Raghavarao%2C%20K.%20--%20Removal%20of%20toxic%20Congo%20red%20dye%20from%20water%20employing%20low-c.pdf
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.