Chemically active ceramic compositions with a phospho-acid moiety
AssigneeSyracuse University
InventorsLawrence L. Tavlarides, Nandu Deorkar
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Abstract
Novel composite materials useful for removing heavy metal ions from solutions, such as aqueous waste streams, comprise an inorganic ceramic support, such as silica gel, having terminal hydroxy groups, to the oxygen of which a ligand is covalently bonded through a silane coupling agent, the ligand being a phosphorous or thiophosphorous based acid moiety.
Claims36
A method of removing heavy metal ions from a liquid stream comprising the step of contacting the stream with a composite material under conditions effective to complex said heavy metal ions on said composite material, said composite material having the formula:
- ##STR28## wherein at least one of R.sub.1, R.sub.2, and R.sub.3 is SUPPORT--O-- and R.sub.4 is ##STR29## wherein X is S or O;
- R.sub.5 is --(CH.sub.2).sub.a --, where a is an integer from 1 to 5;
- or ##STR30## wherein R.sub.8 -R.sub.11 are the same or different and are --H or --(CH.sub.2).sub.b CH.sub.3 where b is an integer from 0 to 20;
- or ##STR31## wherein c and d are integers from 1 to 5 and c+d are no greater than 6;
- R.sub.6 and R.sub.7 can be the same or different and are --H or --(CH.sub.2).sub.b CH.sub.3 ;
- and
- remaining of R.sub.1, R.sub.2 and R.sub.3 are ##STR32## or an alkyl group having 1 to 5 carbon atoms;
- or ##STR33##
A method of removing heavy metal ions from a liquid stream comprising the step of contacting the stream with a composite material under conditions effective to complex said heavy metal ions on said composite material and thereafter breaking said complex to free or recover said metal ion or ions and to regenerate composite material by treating said material with a stripping solution, said composite material having the formula:
- ##STR34## wherein X is S or O;
- at least one of R.sub.12, R.sub.13 and R.sub.14 is ##STR35## wherein at least one of R.sub.15, R.sub.16 and R.sub.17 is SUPPORT--O-- and remaining of R.sub.15, R.sub.16 and R.sub.17 are unsubstituted or lower alkyl or lower aryl substituted saturated hydrocarbon chains having 1 to 20 carbon atoms, and e is an integer from 1 to 5;
- and
- remaining of R.sub.12, R.sub.13 and R.sub.14 are --OH, --(CH.sub.2).sub.f CH.sub.3, or --O--(CH.sub.2).sub.f CH.sub.3 wherein f is an integer from 0 to 5.
A method of removing heavy metal ions from a liquid stream comprising the step of contacting the stream with a composite material under conditions effective to complex said heavy metal ions on said composite material and breaking said complex to free or recover said metal ion or ions in the stripping solution to regenerate composite material, said composite material having the formula:
- ##STR36## wherein at least one of R.sub.18, R.sub.19 and R.sub.20 is SUPPORT--O-- and R.sub.21 is unsubstituted or lower alkyl substituted or lower aryl substituted hydrocarbon chain having 1 to 20 carbon atoms, or ##STR37## wherein f is an integer from 0 to 20 and g is an integer from 1 to 10;
- and other of R.sub.18, R.sub.19 and R.sub.20 are R.sub.21 ;
- and
- R.sub.22 is a ligand having the formula ##STR38## wherein Y is O and only one of R.sub.23, R.sub.24, and R.sub.25 is --H and other of R.sub.23, R.sub.24 and R.sub.25 are unsubstituted or lower alkyl substituted hydrocarbon chains having 5 to 25 carbon atoms or all of R.sub.23, R.sub.24 and R.sub.25 are unsubstituted or lower alkyl substituted hydrocarbon chain having 5 to 25 carbon atoms, or ##STR39## wherein Z is O or S and R.sub.26 -R.sub.28 are hydrocarbon chains having 5 to 25 carbon atoms, or ##STR40## wherein A and B are same or different and are O or S, and wherein R.sub.22 is adsorbed on R.sub.21.
Dependencies are inferred from the claim text.