how can transition metal ions be removed from aqueous solutions using agro waste?

Question

explain the removal of transition metal ions like copper and nickel from aqueous solutions using agro waste?

Transition metals like Copper and Nickel.

Answer 1

Agro waste can support microbial lift such as sulfate-reducing bacteria (SRB). SRB reduce any sulfate in the aqueous solution to sulfide which combines with the transition metal ions to from metal sulfides that precipitate out and become removed from the solution..

Answer 2

The Agro waste is used to culture microorganisms which do the actual work. I do not know about Copper and Nickel, but you might find some help in the work of A.K. Paul of the University of Calcutta, who has worked with the more toxic Chromium ions.

I believe that the original concept was developed by J.C. Frey.

Answer 3

upload some drops of a lead salt. A black precipitate of lead(II) sulphide will kind with the (NH4)2S answer, at a similar time as a white precipitate of lead(II) hydroxide would be produced with NH3(aq). Pb2+(aq) + (S)2-(aq) ---> PbS(s) Pb2+(aq) + 2OH-(aq) ---> Pb(OH)2(s) additionally... 'Basma' shows including dilute nitric acid at the start - that's in all likelihood to decompose the ammonium sulphide to H2S, or, certainly, to decompose any BaS that should initially kind. The try, as defined, is the try for sulphates quite than sulphides, and the acid is added earlier including the barium salt to confirm that different ions that should intervene with the try (e.g. carbonate, sulphide...) are decomposed. If no acid became added then the two recommendations might produce a precipitate with a barium salt, regardless of the reality that if in basic terms some drops of the barium answer have been added then this could paintings, as barium hydroxide is a lot lots greater soluble in water than barium sulphide. PPS Whooops ... ammonium sulphide formulation corrected - hasty typo!! PPPS certainly, if there is HCl recent then using lead(II) turns right into a difficulty simply by precipitation of PbCl2 ...however simply by fact the Ksp of lead chloride is much better than that of PbS you ought nonetheless to get the black precipitate first as long as you upload the Pb2+ ions v slowly, then the Ksp of PbS would be exceeded, and a black ppt considered, earlier the PbCl2 gets a huge gamble to kind.

Answer 4

Urea can be used to complex metal ions.