Abstract
In this paper, the removal of congo red (CR) dye by adsorption on coinage nanoparticles [silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs)] coated activated carbon (AC) has been discussed. The effect of various process parameters has been investigated by following the adsorption technique. Equilibrium adsorption data of CR were carried out at room temperature. The equilibrium time is independent of the initial CR concentration and the percentage removal of CR increased with increase in contact time. The adsorption data were analyzed by using adsorption isotherm studies. The characteristic parameters for isotherm and related correlation coefficients were determined from graphs of their linear equations. Kinetic studies showed that the adsorption of CR followed pseudo-first-order kinetics. AgNPs- and AuNPs-coated AC is found to be suitable adsorbent for the adsorption of CR. CR was effectively removed 88.0 ± 0.8 % from aqueous solution using AuNPs beads as the adsorption process. Desorption studies were made to elucidate recovery of the adsorbate and adsorbent for the economic competitiveness of the removal system. The PVP-supported AgNPs and AuNPs-coated AC were successfully recycled for ten successive adsorption–desorption cycles indicating its high reusability.
Highlights
Water is the most essential requirement in daily life that has been contaminated by the disposal of domestic, municipal, and industrial wastes
The characteristic parameters for isotherm and related correlation coefficients were determined from graphs of their linear equations
It is interesting to find that adsorption on coinage nanoparticles [silver nanoparticles (AgNPs) and AuNPs can be synthesized with PVP, glucose and AgNO3 for AgNPs, and HAuCl4 for AuNPs promoted by microwave irradiation
Summary
Water is the most essential requirement in daily life that has been contaminated by the disposal of domestic, municipal, and industrial wastes. The removal of colored and colorless organic pollutants from industrial wastewater is considered as an important application of adsorption processes (AlQodah 2000). The preparation of AgNPs and AuNPs was carried out by irradiating the solution under microwave. The reaction solution were prepared by dissolving 0.5 mol/L glucose, 1.0 9 10-4 mol/L AgNO3, and 1 % PVP in triple distilled water in a 50-ml conical flask to obtain a homogeneous reaction mixture. The efficiency of the removal of CR from aqueous solutions using PVP-supported AgNPs and AuNPs-coated AC was experimentally studied by recording adsorption isotherms. To determine the equilibrium adsorption capacity of the CR by PVP-supported AgNPs and AuNPs-coated AC, 100 ml of CR solution was placed separately in columns (10 cm height and 4 cm diameter) filled with accurately weighed amounts of PVP-supported AgNPs and AuNPscoated AC. The above washed adsorbents were reused to study further the change in removal efficiency of used adsorbents
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