NOVELTY - Chelating agent modified graphene oxide (I) is new.    USE - (I) is useful to: produce metal catalysts; remove metal ions (including nickel, mercury, cadmium, cobalt, iron, platinum, ruthenium, gold, chromium, copper, magnesium, manganese, molybdenum, rhodium, silicon, tantalum, titanium, tungsten, uranium, vanadium, zirconium and lithium) for producing drinking water, extracting metals and environmental remediation; and produce high capacity performance lithium ion battery. The ethylene diamine triacetate-graphene oxide, the microparticles or nanoparticles is/are useful as fuel cell catalysts (all claimed). (I) is useful in water purification, waste water treatment, battery research, fuel and solar cells, polymer composites, catalyst support and manufacturing catalysts and water purification devices. (I) is useful: for absorbing quinone, anthquinone and other quinone derivatives and for catalysis of the reduction of oxygen; as catalyst support for cathode or anode material fabrication in the manufacturing fuel cells, especially in direct methanol and ethanol fuel cells; to generate conducting polymers by forming composites with polymers such as polyaniline, polypyrrole, polythiophene, and other polymer from monomers of aniline, pyrrole, thiophene and their derivatives; and as drug delivery vehicles in medical devices. (I) (as a composite with common and specific polymers) is useful as electron emission sources of field-emission displays, supercapacitor electrode materials, cathodes and anodes of lithium ion batteries, and in the enhancement of the performance of traditional lead-acid battery systems. (I) (as a compostie with Nafion (RTM: Sulfonated tetrafluoroethylene-based fluoropolymer copolymer)) is useful as general electrode materials.    ADVANTAGE - (I) exhibits good solubility in aqueous solution.    DETAILED DESCRIPTION - Chelating agent modified graphene oxide of formula (G(AB1)x) (I) is new, where the ratio of basic graphene oxide units to x is 1:0.00001 to 1:0.5.    G = graphene oxide;    A = linking moiety including -(CH2)m-, -NH-, -S-, -O-Si(-OR1)2(-CH2)m-, -C(=O)-, -C(=O)-O-, -C(=O)-O(CH2)m-, -C(=O)-NH-, -C(=O)-NH-(CH2)m-, -P(=O)2-O-;    m = 1-12;    R1 = H or 1-12C alkyl; and    B1 = a chelating moiety.    INDEPENDENT CLAIMS are included for:    (1) the preparations of (I); and    (2) a method of using (I) to: produce metal catalysts comprising (i) solubilizing or dispersing (I) in aqueous or organic solvent, (ii) adding a metal salt (including salts of nickel, cobalt, iron, platinum, ruthenium, gold, chromium, copper, magnesium, manganese, molybdenum, rhodium, silicon, tantalum, titanium, tungsten, uranium, vanadium, zirconium or lithium) to the solution or suspension obtained from the step (i) and (iii) precipitating the metal complex of (I) obtained from step (ii) to produce micro particles or nanoparticles of the metal nanoparticles for use as catalyst; remove metal ions from water comprising (a) placing (I) into filtration device, and (b) passing metal-ion-containing water through the filtration device to remove metal ions; and produce high capacity performance lithium ion battery comprising replacing all other carbon materials in lithium ion battery with (I) to produce the high performance energy battery.