Removal of phenol and conventional pollutants from aqueous effluent by chitosan and chitin

Abstract

Recebido em 7/1/09; aceito em 27/4/09; publicado na web em 7/10/09The present study deals with phenol adsorption on chitin and chitosan and removal of contaminants from wastewater of a petroleum refinery. The adsorption kinetic data were best fitted to first-and second-order models for chitosan and chitin, respectively. The results of adsorption isotherms showed Langmuir model more appropriately described than a Freundlich model for both adsorbents. The adsorption capacity was 1.96 and 1.26 mg/g for chitin and chitosan, respectively. Maximum removal of phenol was about 70-80% (flow rate: 1.5 mL/min, bed height: 18.5 cm, and 30 mg/L of phenol. Wastewater treatment with chitin in a fixed-bed system showed reductions of about 52 and 92% for COD and oil and greases, and for chitosan 65 and 67%, respectively. The results show improvement of the effluent quality after treatment with chitin and chitosan.

Adsorption of phenol over bio-based silica/calcium carbonate (CS-SiO2/CaCO3) nanocomposite synthesized from waste eggshells and rice husks

“…The results indicate favorable adsorption in all cases. Similar observations have been reported for phenol's sorption on rice husk and chitin (Milhome et al, 2009;Chraibi et al, 2016).…”

Efficacy of Chitosan in Inhibiting the Oxidation of (+)-Catechin in White Wine Model Solutions

“…The different behaviors of chitosan with respect to phenolic compounds are the consequence of several interaction mechanisms described for it. In fact, it contains functional groups, such as amino, acetamido, and hydroxy, that are prone to link molecules by ion exchanges, van der Waals interactions, and hydrogen bonds, also as a function of pH . It was found that the lower the pH, the higher the phenol adsorption efficiency, because of the electrostatic interaction exerted by ammonium groups on phenolate anions .…”

Development of a Low-Cost Oleophilic Adsorbent Based on Aminated Chitosan - Poly (Butyl Acrylate) Graft Copolymer for Marine Oil Spill Cleanup.

“…Oil adsorbent materials have been stated to be one of the most highly effective sorbents from the economic and ecologic point of view such as bentonite, silica aerogels, activated carbon, and polymers [11][12][13][14]. Additionally, the development of oil adsorbent materials based on natural organic waste materials was presented to afford resources for marine oil spill clean-up with low-cost production [15]. It has been reported that adsorbents based on biopolymeric materials resultant from renewable resources are an innovating solution to replace the other conventional petroleum-based adsorbents.…”