Water polishing of phenol by walnut green hull as adsorbent: an insight of adsorption isotherm and kinetic

Abstract

The present paper aims to investigate water purification of phenol by walnut green hull adsorbent.The surface characteristics of the adsorbent were studied using Fourier transform infra-red (FTIR), scanning electron microscope, and X-ray diffraction (XRD) techniques. The presence of functional groups such as hydroxyl and carbonyl onto walnut green hull surface was proved by FTIR analysis. . Also, the adsorption kinetics of phenol on the adsorbent were studied. The rates of sorption were found to conform to pseudo-second-order kinetics with good correlation.

A Comprehensive Review on the Chemical Constituents and Functional Uses of Walnut (Juglans spp.) Husk

“…Walnut green husk as adsorbent was also examined for the removal of phenol from water [152]. The authors achieved the maximum sorption at pH 4.0, and the results indicated that the Langmuir isotherm was the appropriate model for describing the obtained data for the adsorption of phenol onto the green husk of walnut fruit.…”

Improvement of montmorillonite adsorption capacity for lead ions by modifying with hexadecyl trimethyl ammonium chloride: Characterization, modelling and optimization studies

“…A lower removal efficiency under highly acidic conditions can be due to the occupation of active sites of N-HTAC by H + and H 3 O + . Under these conditions, the surface of adsorbent was protonated and was positively charged resulting in a repulsive force between adsorbate and adsorbent and excessive H + fought with Pb 2+ in the solution for an ion exchange reaction with unsaturated ions in N-HTAC [29,34]. The pH zpc (pH zero point charge ) of adsorbent is very important in the determination of optimum pH [31,35].…”

Assessing some advanced oxidation processes in the abatement of phenol aqueous solutions

“…Phenol is a contaminant present in water derived from various chemical processes, mainly used in the manufacture of resins, cosmetics, pharmaceuticals, paints, pesticides, solvents and household cleaning products [1,2]. It is a hydroxylated derivative of benzene.…”

“…It is a hydroxylated derivative of benzene. Phenol is a white powder of high stability, great solubility and low biodegradability [1,2]. It is classified as priority hazardous pollutant by EPA [2,3].…”