Abstract
In this study, the potential of bone char for Royal Blue Tiafix and Black Tiassolan dyes adsorption from aqueous solutions was evaluated. The adsorbent was characterized physically and chemically by adsorption/desorption of N2 at 77 K, scanning electron microscopy, X-ray diffraction, and infrared spectroscopy. The equilibrium adsorption results for bone char can be successfully modeled by the Langmuir and Freundlich isotherms. Pseudo-first-order and pseudo-second-order models were used to describe the kinetic data and rate constants were evaluated. Kinetics of each dye was found to follow pseudo-second-order rate kinetic model, with great correlation (higher than 0.99). In order to reduce the number of experiments to achieve better dye removal efficiency, a 2³ full factorial design with three central points and six axial points was applied in the equilibrium experiments. The variables analyzed were agitation, temperature, and pH.
Highlights
The objectives of this study were to investigate the removal of Royal Blue Tiafix and Black Tiassolan dyes by bone char (BC), to identify the key factors controlling the batch adsorption process using a full factorial design, to optimize the adsorption conditions using 23 factorial
The N2 adsorption/desorption isotherms provide a textural characterization of the BC adsorbent
This study evaluated the potential use of BC as adsorbent for removal of the Royal Blue Tiafix (AR.TF) and P.TS dyes from aqueous solutions
Summary
The sectors of activities such as yarn dyeing and industrial laundries generate large amounts of wastewater containing chemicals present in the industrial effluent. This wastewater is subjected to treatment at the wastewater treatment plant (WTP) of the companies themselves, becoming a solid waste, called sludge (Islam et al, 2011). Textile industries have great difficulty in effectively treating wastewater generated in its complex production chain; on removing dyes from these effluents, even in small quantities, given their intense color. There are the environmental impacts caused by the sludge generated by the textile industry effluent treatment, which in most cases do not have adequate treatment and disposal (Karthik and Rathinamoorthy, 2015). The final destination of sludge generated in WTPs is a serious problem worldwide (Tamanini et al, 2008)
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