Binding of metal cations by natural substances

Abstract

SynopsisThe binding of mercuric chloride and other metal salts to bark, activated sludge (Milorganite), chitosan, poly(p-aminostyrene), and other natural and synthetic materials was investigated by specific atomic absorption and x-ray fluorescence spectroscopy. The synthetic poly(amin0styrene) was included for comparison with the natural polyamine chitosan. Our results show that a wide range of natural materials are potentially useful for the removal of toxic and precious metals that may be present in industrial effluents, mine waters, or other water supply. Such metal salts include those of mercury, lead,

Removal of Hg2+ from aqueous solution using alginate gel containing chitosan

“…5,6 Chitosan is a hydrophilic, natural cationic polymer formed by the N-deacetylation of chitin, 7 which is present in fungi, insects, and crustaceans. Chitosan has been known for its metal adsorption properties since 1970s, 7,8 and it has been shown to effectively remove metals such as silver, 8 cadmium, 9 arsenic, 10 gold, 11,12 vanadium, 13 copper, [14][15][16] nickel, 14,17 chromium, 14,18 and mercury 17,19 from aqueous solutions. It was reported that the maximum adsorption capacity of chitosan for Hg 2þ was 815 mg/g.…”

Waste spider crab shell and derived chitin as low‐cost materials for cadmium and lead removal

“…This result indicates that the DD is quite high, 12 therefore metal sorption should be important. 2,4 In this work we found the sorption capacity of chitin to be much less than that of raw crab shell. Other authors used chitosan with higher DD (94%), and obtained better results for metal removal.…”

Heavy metals removal in aqueous environments using bark as a biosorbent

“…5). One of the oldest publications on bark adsorption was the study of Masri et al (1974). In that study, Douglas fir and black oak barks were treated with mercury solutions and the adsorption quantities were 100 mg Hg/g for Douglas fir bark and 400 mg Hg/g for black oak bark.…”