Dynamic isotherms of dye in activated carbon

Abstract

Textile industrial wastewaters have significant quantities of dyes. Adsorption processes using industrials rejects may help in the treatment of these effluents. In this context, uptake of Reactive Blue 5G dye by babassu coconut shell activated carbon was studied with upstream flow fixed-bed experiments. First, the minimum flow rate that minimizes the diffusion effects of 4 mL/min was chosen within the range investigated (2-10 mL/min). Then, the breakthrough curves were obtained for this flow rate for different initial dye concentrations (13.15-102.0 mg/L) and temperature of 30 °C. The mass retained until bed saturation in each experiment was used to obtain the dynamic isotherms, which showed a favorable dye uptake behavior with a maximum adsorption capacity of 12.9 mg.g -1 . The irreversible model fitted the experimental data well when compared to Langmuir and Freundlich models. A LDF model simulated the experimental breakthrough curves, and the bed axial dispersion and mass transfer coefficients were estimated.

Dye Waste Treatment

“…A dynamic isotherm of dye in activated carbon was investigated [84]. The uptake of Reactive Blue 5G by babassu coconut shell activated carbon was studied and the results obtained showed a favorable dye uptake behavior with maximum adsorption capacity of 12.9 mg/g.…”

Adsorption of turquoise blue QG reactive bye commercial activated carbon in batch reactor: kinetic and equilibrium studies

“…Activated carbon adsorption processes are often used for this purpose due to their versatility, efficiency and low operating costs (Matta et al, 2008;Lambrecht et al, 2007). Owing to its structural characteristics, specifically its large surface area and high pore distribution, activated carbon is a highly efficient adsorbent (Bangash and Alam, 2009).…”

Valorization of Wasted Black Tea as a Low-Cost Adsorbent for Nickel and Zinc Removal from Aqueous Solution

“…Based on the results, wasted black tea is rich in elements such as carbon and calcium similar to the activated carbon. The high concentrations of these elements allow the adsorbent to exhibit high sorption capacity [28].…”