6533b824fe1ef96bd1281314

RESEARCH PRODUCT

Single and competitive adsorption of Cd and Zn onto a granular activated carbon

Aurora SecoJosé FerrerCarmen GabaldónPaula Marzal

subject

Granular activated carbonCadmiumEnvironmental EngineeringPrecipitation (chemistry)Ecological ModelingInorganic chemistrychemistry.chemical_elementZincPollutionMetalAdsorptionchemistryvisual_artvisual_art.visual_art_mediummedicineWaste Management and DisposalCarbonWater Science and TechnologyCivil and Structural EngineeringActivated carbonmedicine.drug

description

Single and competitive adsorption of cadmium and zinc onto granular activated carbon DARCO 12–20 mesh has been investigated. This activated carbon has been shown as an effective adsorbent for both metals. Cadmium and zinc removals increased with pH and decreased with molar metal/carbon ratio. Surface precipitation phenomena have been detected for the higher pHs and molar ratios. The adsorption process has been modelled on the surface complexation Triple Layer Model (TLM). For this purpose, the amphoteric nature of the activated carbon has been studied. Single metal adsorption data have been used to calibrate TLM parameters. A dependence of the adsorption constants on pH and molar metal/carbon ratio has been observed, and a correlation for log Kads has been determined. In the competitive system, the removal efficiency of the activated carbon decreased for both metals. The TLM model, using surface complexation constants determined from single adsorption experiments, successfully predicted cadmium and zinc removal from the two metal solutions.

yearjournalcountryeditionlanguage
1996-12-01Water Research
https://doi.org/10.1016/s0043-1354(96)00165-0