Removal of Phenolic Compounds from Aqueous Phase by Adsorption onto Polymer Supported Iron Nanoparticles

Abstract

The removal of phenolic compounds, i.e., o-cresol, m-cresol, and p-cresol from aqueous solution have been evaluated employing activated carbon (AC) coated with polymer supported iron nanoparticles (FeNPs). The synthesized FeNPs were characterized by scanning electron microscope and X-ray diffraction analysis. High correlation coefficient values indicated that the adsorption of phenolic compounds onto AC coated with polyvinylpyrrolidon (PVP) supported FeNPs obey Freundlich and Langmuir adsorption isotherms. Higher Freundlich and Langmuir constant values for AC coated with PVP supported FeNPs indicated its greater efficiency than AC. The adsorption data are well represented by both the Freundlich and Langmuir isotherms, indicating favourable adsorption of cresols by the adsorbents. Cresols were effectively removed (90 %) by adsorption process from aqueous solution using AC coated with FeNPs. The percentage removal of above phenolic compounds was studied under varying experimental conditions such as pH, temperature, adsorbent dosage, and contact time. The adsorption of phenolic compounds is quite sensitive to pH of the suspension and optimum uptake value was found at pH 7.0. Temperature also has a favorable effect on adsorption when varied from 20 to 50°C. On the contrary, beyond 30°C, a decrease in the adsorption was noticed.

Monitoring the natural attenuation of a sewage sludge toxicity using the Allium cepa test

“…Cresols are substances belonging to a chemical group of phenolic compounds that are employed in several industrial processes (ATSDR, 2008;Sen et al, 2014). m-Cresol and p-cresol are used in the production of contact herbicides, pyrethroid insecticides, fragrances, antioxidants, flame-retardants, synthetic resins, disinfectants and explosives, among other products (OECD, 2003;ATSDR, 2008;Tallur et al, 2009).…”

Study of Adsorption Characteristics a Low-Cost Sawdust for the Removal of Direct Blue 85 Dye from Aqueous Solutions

“…The Freundlich isotherm is applicable to multisite adsorption isotherm for heterogeneous surfaces as well as the adsorption capacity is dependent on the concentration of adsorbate at equilibrium and that the adsorption energy is diverse. The linear form of this isotherm is given by the equation [34][35][36][37]: e f e 1 logQ logK logC n  (8) where Qe (mg g -1 ) is the amount of dye adsorbed, Kf and n are constants for the Freundlich adsorption, an indicator of adsorption capacity and adsorption intensity respectively and Ce (mg L -1 ) is the equilibrium concentration of the adsorbate. The graph of log Qe versus log Ce for the adsorption data of dye is shown in Fig.…”

Electrochemically assisted photocatalytic removal of m-cresol using TiO2 thin film-modified carbon sheet photoelectrode

“…Traditional physical techniques, such as flocculation, adsorption on activated carbon and ultra-filtration may be employed efficiently to remove such recalcitrant pollutants. However, they are non-destructive, because they just transfer the dye compounds from water to another phase which would cause a secondary environmental pollution [1][2][3][4][5][6]. This has led to the requirement of regeneration of the adsorbent materials and post-treatment of solid wastes and both of them are expensive [7].…”