Copper and cadmium adsorption on pellets made from fired coal fly ash

Papandreou, A; Stournaras, CJ; Panias, D

dc.contributor.author	Papandreou, A	en
dc.contributor.author	Stournaras, CJ	en
dc.contributor.author	Panias, D	en
dc.date.accessioned	2014-03-01T01:26:03Z
dc.date.available	2014-03-01T01:26:03Z
dc.date.issued	2007	en
dc.identifier.issn	0304-3894	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17903
dc.subject	Adsorption	en
dc.subject	Adsorption isotherms	en
dc.subject	Copper and cadmium removal	en
dc.subject	Desorption	en
dc.subject	Fly ash	en
dc.subject	Kinetics	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	Adsorbents	en
dc.subject.other	Adsorption	en
dc.subject.other	Adsorption isotherms	en
dc.subject.other	Desorption	en
dc.subject.other	Fly ash	en
dc.subject.other	Heavy metals	en
dc.subject.other	pH effects	en
dc.subject.other	Solutions	en
dc.subject.other	Strength of materials	en
dc.subject.other	Extraction media	en
dc.subject.other	Heavy metals immobilization	en
dc.subject.other	Industrial landfills	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	cadmium	en
dc.subject.other	cement	en
dc.subject.other	coal	en
dc.subject.other	copper	en
dc.subject.other	ground water	en
dc.subject.other	Adsorbents	en
dc.subject.other	Adsorption	en
dc.subject.other	Adsorption isotherms	en
dc.subject.other	Desorption	en
dc.subject.other	Fly ash	en
dc.subject.other	Heavy metals	en
dc.subject.other	pH effects	en
dc.subject.other	Solutions	en
dc.subject.other	Strength of materials	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	adsorption	en
dc.subject.other	cadmium	en
dc.subject.other	coal	en
dc.subject.other	copper	en
dc.subject.other	fly ash	en
dc.subject.other	kinetics	en
dc.subject.other	pollutant removal	en
dc.subject.other	wastewater	en
dc.subject.other	acidity	en
dc.subject.other	adsorption kinetics	en
dc.subject.other	article	en
dc.subject.other	desorption	en
dc.subject.other	encapsulation	en
dc.subject.other	equilibrium constant	en
dc.subject.other	fly ash	en
dc.subject.other	heavy metal removal	en
dc.subject.other	industrial area	en
dc.subject.other	isotherm	en
dc.subject.other	pollution control	en
dc.subject.other	porosity	en
dc.subject.other	strength	en
dc.subject.other	waste water	en
dc.subject.other	Adsorption	en
dc.subject.other	Cadmium	en
dc.subject.other	Carbon	en
dc.subject.other	Copper	en
dc.subject.other	Hydrogen-Ion Concentration	en
dc.subject.other	Particulate Matter	en
dc.subject.other	Water Pollutants, Chemical	en
dc.subject.other	Water Purification	en
dc.title	Copper and cadmium adsorption on pellets made from fired coal fly ash	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jhazmat.2007.03.020	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jhazmat.2007.03.020	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Studies on the utilization of low cost adsorbents for removal of heavy metals from wastewaters are gaining attention. Fired coal fly ash, a solid by-product that is produced in power plants worldwide in million of tonnes, has attracted researchers' interest. In this work, fly ash was shaped into pellets that have diameter in-between 3-8 mm, high relative porosity and very good mechanical strength. The pellets were used in adsorption experiments for the removal of copper and cadmium ions from aqueous solutions. The effect of agitation rate, equilibration time, pH of solution and initial metal concentration were studied. The adsorption of both cations follows pseudo-second order kinetics reaching equilibrium after an equilibration time of 72 h. The experimental results for copper and cadmium adsorption fit well to a Langmuirian type isotherm. The calculated adsorption capacities of pellets for copper and cadmium were 20.92 and 18.98 mg/g, respectively. Desorption experiments were performed in several extraction media. The results showed that both metals were desorbed substantially from pellets under acidic solutions. For this reason, metal saturated pellets were encapsulated in concrete blocks synthesized from cement and raw pulverized fly ash in order to avoid metal desorption. The heavy metals immobilization after encapsulation in concrete blocks was tested through desorption tests in several aqueous media. The results showed that after 2 months in acidic media with pH 2.88 and 4.98 neither copper nor cadmium were desorbed thus indicating excellent stabilization of heavy metals in the concrete matrix. As a conclusion, the results showed that fly ash shaped into pellets could be considered as a potential adsorbent for the removal of copper and cadmium from wastewaters. Moreover, the paper proposes an efficient and simple stabilization process of the utilized adsorbents thus guarantying their safe disposal in industrial landfills and eliminating the risk of pollution for groundwater and other natural water receivers. (C) 2007 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Hazardous Materials	en
dc.identifier.doi	10.1016/j.jhazmat.2007.03.020	en
dc.identifier.isi	ISI:000249902000006	en
dc.identifier.volume	148	en
dc.identifier.issue	3	en
dc.identifier.spage	538	en
dc.identifier.epage	547	en