Removal of metals from aqueous solutions using natural chitinous materials.

Type:
artikel
Titel:
Removal of metals from aqueous solutions using natural chitinous materials.
Auteur:
Rae, I. B.; Gibb, S.W.
Taal:
Engels
Uitgever:
S.l. : s.n., n.d
Nota:
Water science and technology. 47(2003)10, p. 189-196
Plaatsnummer:
Onderwerp:
Afvalwater
Zware metalen
Samenvatting:
Samenvatting:Four naturally derived chitinous materials, commercial cryogenicallymilled carapace (CCMC), mechanically milled carapace (MMC), chitin andchitosan, were assessed for their ability to remove a range of alkali,alkaline earth, transition and heavy metals from aqueous media inflow-through column trials. The materials showed a poor affinity for thealkali metals and alkaline earth metals but significantly greateraffinity for transition and heavy metals:an:general, chitin was the leastefficient material for removal of transition and heavy metals (similarto35%) while chitosan was most effective (>99%). CCMC and MMC;bothremoved >90% of transition and heavy metals tested from solution. Batchstudies conducted using copper as a reference metal demonstrated thatremoval was dependent on a number of variables including pH, contacttime, particle size, metal concentration, metal type and thephysic-chemical characteristics of the materials. Detailed analysis ofthe results from these studies indicate that removal is a complex processand that metals can be sequestered from solution by a number-ofmechanisms including adsorption, absorption and precipitaion.
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