Removal of Orange G and Rhodamine B dyes from aqueous system using hydrothermally synthesized zinc oxide loaded activated carbon (ZnO-AC)
Date
2017
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
This study reports the synthesis of zinc oxide loaded activated carbon (ZnO-AC) using hydrothermal method and its use to remove organic dyes [Orange G (OG) and Rhodamine B (Rh-B)] from the aqueous system under varying process conditions. ZnO-AC nanoparticles were characterized using XRD, SEM, EDX, DLS, and FTIR. The Langmuir adsorption model was best fitted to the experimental data for both the dyes. Langmuir adsorption capacity (qmax) for OG and Rh-B was 153.8 and 128.2 mg/g, respectively. The rate of adsorption was investigated by various models namely pseudo-first-order, pseudo-second-order and intraparticle diffusion model. Rate mechanism was described by pseudo-second-order model for both the dyes. Thermodynamic studies suggested that removal of Rh-B onto ZnO-AC was endothermic up to a temperature of 40 ?C while OG removal decreased with increase in temperature. Negative values of ? G0 for adsorption of dyes suggested spontaneous adsorption processes. ? 2017 Elsevier Ltd. All rights reserved.
Description
Keywords
Activated carbon, Adsorption, Citrus fruits, Dyes, Enzyme kinetics, Hydrothermal synthesis, Nanoparticles, Rhodium, Scanning electron microscopy, Stripping (dyes), Zinc, Zinc oxide, Dye removal, Hydrothermally synthesized, Intraparticle diffusion models, Langmuir adsorption model, Process parameters, Pseudo-second order model, Spontaneous adsorption, Thermodynamic studies, Chemicals removal (water treatment)
Citation
Saini, J., Garg, V. K., Gupta, R. K., & Kataria, N. (2017). Removal of Orange G and Rhodamine B dyes from aqueous system using hydrothermally synthesized zinc oxide loaded activated carbon (ZnO-AC). Journal of Environmental Chemical Engineering, 5(1), 884-892. doi: 10.1016/j.jece.2017.01.012