Kinetic and equilibrium studies on the removal of C-14-ethion residues from wastewater by copper-based metal-organic framework
authors Abdelhameed, RM; Abdel-Gawad, H; Silva, CM; Rocha, J; Hegazi, B; Silva, AMS
nationality International
journal INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
author keywords Adsorption mechanism; Copper-based metal-organic framework; Ethion; Kinetics; Modeling; Type IV isotherm
keywords RESPONSE-SURFACE METHODOLOGY; EFFECTIVE ADSORPTION; AQUEOUS-SOLUTION; ORGANOPHOSPHORUS PESTICIDES; ACTIVATED CARBON; AZO DYES; MALATHION; DEGRADATION; ADSORBENT; NANOPARTICLES
abstract There are compelling economic and environmental reasons to remove pesticides from wastewater because they are toxic and carcinogenic. The effectiveness of copper-based metal-organic framework (Cu-BTC) for adsorbing the insecticide C-14-ethion from wastewater has been studied as function of contact time, adsorbent dosage, temperature and pH. C-14-ethion/Cu-BTC isotherms exhibit two plateaus (BET type IV) and are reliably represented by Brunauer-Deming-Deming-Teller and Zhu-Gu models, with deviations of only 1.99 and 3.95%, respectively. The removal curve measured under batch operation is well represented by a pseudo-first-order equation, yielding results equivalent to the theoretical linear driving force model of Glueckauf. At pH 7, 75 mg L-1 ethion concentration, 150 min, 25 degrees C and 0.425 g L-1 Cu-BTC dose, the sorbent capacity is ca. 122 mg g(-1). Moreover, Cu-BTC has a good stability after six adsorptions cycles. Finally, our results disclose the fundamental understanding of the adsorption mechanism: the ethion molecule coordinates to two copper(II) atoms across the metal-organic framework channel via the phosphoryl (P-O) group.
publisher SPRINGER
issn 1735-1472
year published 2018
volume 15
issue 11
beginning page 2283
ending page 2294
digital object identifier (doi) 10.1007/s13762-017-1624-4
web of science category Environmental Sciences
subject category Environmental Sciences & Ecology
unique article identifier WOS:000446534600002
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