Cork stoppers as an effective sorbent for water treatment: the removal of mercury at environmentally relevant concentrations and conditions
authors Lopes, CB; Oliveira, JR; Rocha, LS; Tavares, DS; Silva, CM; Silva, SP; Hartog, N; Duarte, AC; Pereira, E
nationality International
journal ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
author keywords Mercury; Cork; Sorption; Recycling; Ionic competition; Kineticmodelling; Metal removal
keywords AQUEOUS-SOLUTIONS; QUERCUS-SUBER; WASTE BIOMASS; HEAVY-METALS; BIOSORPTION; IONS; SORPTION; EQUILIBRIUM; POWDER; CU(II)
abstract The technical feasibility of using stopper-derived cork as an effective biosorbent towards bivalent mercury at environmentally relevant concentrations and conditions was evaluated in this study. Only 25 mg/L of cork powder was able to achieve 94 % of mercury removal for an initial mercury concentration of 500 mu g/L. It was found that under the conditions tested, the efficiency of mercury removal expressed as equilibrium removal percentage does not depend on the amount of cork or its particle size, but is very sensitive to initial metal concentration, with higher removal efficiencies at higher initial concentrations. Ion exchange was identified as one of the mechanisms involved in the sorption of Hg onto cork in the absence of ionic competition. Under ionic competition, stopper-derived cork showed to be extremely effective and selective for mercury in binary mixtures, while in complex matrices like seawater, moderate inhibition of the sorption process was observed, attributed to a change in mercury speciation. The loadings achieved are similar to the majority of literature values found for other biosorbents and for other metals, suggesting that cork stoppers can be recycled as an effective biosorbent for water treatment. However, the most interesting result is that equilibrium data show a very rare behaviour, with the isotherm presenting an almost square convex shape to the concentration axis, with an infinite slope for an Hg concentration in solution around 25 mu g/L.
publisher SPRINGER HEIDELBERG
issn 0944-1344
year published 2014
volume 21
issue 3
beginning page 2108
ending page 2121
digital object identifier (doi) 10.1007/s11356-013-2104-0
web of science category Environmental Sciences
subject category Environmental Sciences & Ecology
unique article identifier WOS:000330970400047
link 24026204

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