Metal ion adsorption by Phomopsis sp. biomaterial in laboratory experiments and real wastewater treatments

An insoluble material of polysaccharidic nature has been obtained by thermal alkali treatment of the filamentousfungus Phomopsis sp. FT-IR spectrum of the resulting material as well as its nitrogen content suggest that chitosan andglucans are the main components of the biomaterial. Information on Lewis base sites has also been obtained and usedas a guideline in the evaluation of the complexing ability against a number of metal ions in aqueous media at pH in therange 4–6. Results indicate that after 24 h contact time, up to 870 mmol/g of lead, 390 mmol/g of copper, 230 mmol/g ofcadmium, 150 mmol/g of zinc and 110 mmol/g of nickel ions are adsorbed into the material. After approximately 10 min,about 70% of the overall adsorption process has already been completed. Adsorbed metal ions can be recovered bywashing with dilute acid. Experiments have been extended to a real wastewater effluent confirming the potential of thisbiomaterial as a depolluting agent.