A water remediation system and accompanying method includes remediation by reducing the concentration of nutrients in the water and dosing the water with metal ions. It has been found that through a combination of reducing nutrients present in the water and treating with metal ions, the requirement to treat with high chemical dosages is removed.

Disclosed is a method for treating water, including the extraction of at least two ionic species, the ionic species including an anionic species and a cationic species and being present in the water to be treated, the method especially including a step of mixing a liquid hydrophobic organic phase and the water to be treated, the water to be treated being in the liquid state, in order to subsequently obtain liquid treated water and a hydrophobic liquid organic phase loaded with the ionic species, and a step of thermal regeneration of the organic phase loaded with chemical species. Also disclosed are compounds and compositions that can be used in the method.

Metal-chelating compositions having the structure (1a) wherein: R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently selected from the following groups: (i) hydrogen atom, (ii) hydrocarbon groups (R) containing 1-12 carbon atoms; (iii) halogen atoms; (iv) —P(R.sup.5) (═O)OH groups; (v) —C(═O)OH groups; (vi) —S(═O).sub.2OH groups; and (vii) —OH groups, wherein R.sup.5 is selected from hydrocarbon groups (R) and —OH; R.sup.1 and R.sup.2 may optionally interconnect to form Ring A fused to the ring on which R.sup.1 and R.sup.2 are present; R.sup.3 and R.sup.4 may optionally interconnect to form Ring B fused to the ring on which R.sup.3 and R.sup.4 are present; wherein Ring A and Ring B are optionally and independently substituted with one or more of groups (ii)-(vii). Methods of using the above-described compositions for chelating metal ions having an atomic number of at least 56 (e.g., Ba or Ra) are also described. ##STR00001##

A heterogeneous material (e.g., a metal-organic framework or “MOF”) is useful for removing heavy metals from a liquid (e.g., water). The heterogeneous material may incorporate a group 16-containing heterocycle supported on solid media. Thiophene-containing MOFs, such as ATF-1 and DUT-67, may be used to remove lead from water. It is postulated that the metal is adsorbed via non-covalent interactions. The systems and methods described herein may also be applicable to other heavy metals. Thus, the applications are not limited to drinking water purification. Instead, the systems and methods may be used for a broad variety of other applications, such as nuclear waste remediation.

A method of sequestering anions from a liquid including the anions includes contacting a composition comprising at least one macrocyclic moiety with the liquid. The macrocyclic moiety includes groups including an electropositive E-H bond donor extending into a cavity of the macrocyclic moiety wherein E is selected from the group consisting of C, N, and O, wherein two or more groups including an electropositive E-H donor interact with an anion to form a chelate with the anion.

Described herein is a functional graphene composition comprising a graphene scaffold and one or more metal chelating functional groups covalently bonded to the graphene scaffold and a porous substrate that includes the functional graphene composition. Also provided is a method of removing dissolved metals from an aqueous liquid, such as, acid mine drainage.

A method of oxygen scavenging, the method (i) providing an oxygen scavenger composition; and (ii) adding the oxygen scavenger composition to an aqueous feed and/or a hydrocarbon feed of a hydrocarbon processing system.

A method of separating and recovering a cobalt salt and a nickel salt includes a separation step of separating, by using a nanofiltration membrane, a cobalt salt and a nickel salt from a rare metal-containing aqueous solution containing at least both the cobalt salt and the nickel salt as rare metals, in which the nanofiltration membrane has a glucose permeability of 3 times or more a sucrose permeability, the sucrose permeability of 10% or less, and an isopropyl alcohol permeability of 50% or more when a 1,000 mg/L glucose aqueous solution, a 1,000 mg/L sucrose aqueous solution, and a 1,000 mg/L isopropyl alcohol aqueous solution, each having a pH of 6.5 and a temperature of 25° C., individually permeate through the nanofiltration membrane at an operating pressure of 0.5 MPa.

A method and system of removing environmental contaminants from water comprising adding a fatty chemical to form a mixture with the water in which the fatty chemical and the environmental contaminants complex to form molecular complexes. The mixture is then filtered to remove the molecular complexes from the water.

A process to treat metal or mineral ores is disclosed. The metal or mineral ore is a metallic sulphide ore including copper, gold, platinum, silver, nickel, molybdenum, arsenic sulphides, cobalt, zinc, lead, tin, antimony, or combinations thereof with a collector composition including a dimeric fatty nitrile. The dimeric fatty nitrile is prepared by a process including reacting a dimer fatty acid with ammonia at a temperature between about 200° C. and about 400° C. to form a dimeric amide and removing water from the dimeric amide to form the dimeric nitrile. The present disclosure also provides a collector composition containing the dimeric fatty nitrile and at least one further collector or frother compound.