An in vitro study on the decolourisation of Corafix Yellow GD3R dye using green seaweed Caulerpa taxifolia and its toxicological evaluations
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Date
2024-10
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Avinashilingam
Abstract
Caulerpa taxifolia, a green seaweed was harnessed as the biosorbent for decolourisation of Corafix Yellow GD3R from aqueous solution. The characterization of the biosorbent was performed using point of zero charge and BET were investigated. RSM was employed to determine the optimal variables for dye decolourisation which, includes dye concentration (50-300 mg/L), biosorbent concentration (200-700 mg/L), pH (4-10),
and incubation time (24-72hours). The equilibrium studies such as adsorption isotherms, kinetics and thermodynamic were performed to assess the behaviour of the biosorbent.The dealings between the adsorbate and biosorbent were analysed using UV-vis, FTIR spectroscopy, SEM-EDX and XRD. The desorption and regeneration efficiency of the seaweed was estimated under laboratory conditions using various eluents. The physico-chemical parameters of seaweed treated and untreated dye solutions were examined prior to toxicological assessments such as brine shrimp lethality assay, cytogenotoxicity and phytotoxicity. The seaweed was identified as Caulerpa taxifolia and the biosorbent surface
was positively charged. The BET analysis of the biosorbent reveals mesoporous structure significantly enhances the surface area available for sorption. RSM assisted BBD revealed that maximum decolorization of 97 % was achieved under optimized conditions, with the dye 100 mg/L and biosorbent concentration of 500 mg/L, pH 8, and at incubation period of 72 hours at room temperature. In equilibrium studies, the adsorption isotherms follow the Langmuir model, directing that adsorption dye onto the biosorbent occurs through chemisorption and characterized as spontaneous, feasible, endothermic process. Analytical studies confirmed the removal of CYGD3R through the accumulation of the dye on the
surface of C. taxifolia and shift in the adsorption peaks. The physicochemical parameters of the seaweed treated CYGD3R solution were found to be within permissible limits except TSS, sulphate, phosphate and nitrate. Toxicological assessment confirmed that the seaweed treated dye solution was harmless to both flora and fauna. Also, the biosorbent has decolourisation efficiency on real textile effluents. Hence, the research work focuses on the decolourisation of CYGD3R using C.taxifolia as an biosorbent which is ecofriendly, low cost and not harmful to the ecosystem.
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Zoology