Document Detail

Pentachlorophenol removal from aqueous matrices by sorption with almond shell residues.
MedLine Citation:
PMID:  16713079     Owner:  NLM     Status:  MEDLINE    
Sorption with activated carbon has been the technique preferred for pentachlorophenol (PCP) removal from contaminated waters, but regeneration needs and high operation costs are supporting a renewed interest in the search for alternative sorbents. Among them, almond shell, an agricultural by-product, provides interesting economical advantages, once shells account for 50% (in mass) of the whole almond. In this work, the capacity of almond shells to remove PCP from waters without previous activation was studied in batch conditions. While PCP analysis was performed solid-phase microextraction (SPME) followed by gas chromatography with electron capture detection (GC-ECD), mercury porosimetry and Fourier transform infrared spectroscopy (FTIR) provided a preliminary physical and chemical characterization of the sorbent. Almond shells were essentially a macroporous material, with an average surface area of 12.9+/-2.8 m2/g. The efficiency of PCP removal was 93+/-14%, in 24 h, with an initial concentration of 100 microg/l PCP and 5 microg PCP/g shell. Isotherm data adjusted better to Freundlich equation, where K(F) and 1/n were 0.075+/-0.081 mg(1-1/n) l(1/n) and 1.882+/-0.289, respectively. Average desorption efficiency was 7%, indicating strong adsorption capacity. Results proved that almond shells may be an excellent low-cost alternative for PCP removal from contaminated waters.
B N Estevinho; N Ratola; A Alves; L Santos
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Publication Detail:
Type:  Journal Article     Date:  2006-04-15
Journal Detail:
Title:  Journal of hazardous materials     Volume:  137     ISSN:  0304-3894     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-09-18     Completed Date:  2007-01-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1175-81     Citation Subset:  IM    
LEPAE-Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
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MeSH Terms
Feasibility Studies
Pentachlorophenol / pharmacokinetics*
Solid Phase Microextraction
Reg. No./Substance:
7732-18-5/Water; 87-86-5/Pentachlorophenol

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