Abstract: A method of preparing nitrogen-doped carbon nanosheets comprises mixing dried and pulverized Albizia procera with an activation agent in a mass ratio from 1:1 to 1:5 to form a mixture and heating the mixture in an inert atmosphere at a temperature in the range of 400 to 800° C. for 2 to 8 hours to form the nitrogen-doped carbon nanosheets. The activation agent is a carbonate salt and the nitrogen-doped carbon nanosheets have an average pore diameter of 0.5 to 2.5 nm and a carbon dioxide adsorption capacity of 1.0 mmol/g to 3.50 mmol/g.

Abstract: Aspects of the present disclosure are directed to a method of preparing carbon nanosheets, including mixing dried and pulverized Corchorus olitorius sticks with an activation agent in a mass ratio range of 1:1 to 1:10 to form a mixture. Further, the method includes heating the mixture in an inert atmosphere in the range of 500° C. to 700° C. for 2 hours to 8 hours to form the carbon nanosheets. The heating of the mixture includes ramping at a rate of 10° C./min in a range of 50° C. to 700° C. The carbon nanosheets have an average pore diameter of 0.1 nm to 1.0 nm and a carbon dioxide adsorption capacity of 0.5 mmol/g to 3.5 mmol/g and the carbon nanosheets form a porous foam with perforated carbon nanosheet cell walls.

Abstract: A method of separating a gas mixture, including contacting the gas mixture with a membrane and passing a portion of the gas mixture through the membrane. The portion of the gas mixture that passes through the membrane includes carbon dioxide. The membrane includes a poly(ether-block-amide) (PEBAX) and a covalent organic framework (COF). The COF is an optionally substituted COF-316 and the COF is dispersed in a matrix of the PEBAX to form the membrane. The membrane includes 0.1-5 wt. % of the COF relative to a total weight of the membrane.

Abstract: A photoelectrode includes a fluorine-doped tin oxide (FTO) substrate, and a layer of graphitic-poly(2,4,6-triaminopyrimidine) (g-PTAP) nanoflakes at least partially covering a surface of the FTO substrate. Further, the g-PTAP nanoflakes have a width of 0.1 to 5 micrometers (?m). In addition, a method for producing the photoelectrode, and a method for photocatalytic water splitting, in which the photoelectrode is used.

Abstract: A method of preparing a photocatalyst. The method includes a sulfone-containing conjugated polyimide obtained by solvothermally imidizing 3-sulfonyldianiline 1,4,5,8-naphthalenetetracarboxylic dianhydride with poly (amic acid) (PAA). The photocatalyst of the present disclosure can be used in an electrochemical cell for water oxidation processes.

Abstract: A method of preparing a photocatalyst. The method includes a sulfone-containing conjugated polyimide obtained by solvothermally imidizing 3-sulfonyldianiline 1,4,5, 8-naphthalenetetracarboxylic dianhydride with poly (amic acid) (PAA). The photocatalyst of the present disclosure can be used in an electrochemical cell for water oxidation processes.

Abstract: A method of preparing bismuth vanadate particles is described. The bismuth vanadate particles prepared via ultrasonication and hydrothermal treatment exhibit controlled morphology (e.g., octahedral shape) and crystallinity (e.g., tetragonal crystal symmetry). A photoelectrode containing bismuth vanadate particles and a method of using the photoelectrode in a photoelectrochemical cell for water splitting is also provided.

Abstract: A method of fixating CO2 to form a substituted oxazolidinone is described. The method includes mixing a nickel-based metal-organic framework (Ni-MOF) catalyst of formula [Ni3(BTC)2(H2O)3]·(DMF)3(H2O)3, a cocatalyst, an aromatic amine, and at least one epoxide to form a reaction mixture, and further contacting the reaction mixture with a gas stream containing carbon dioxide to react the carbon dioxide in the gas stream with the epoxide and the aromatic amine to form a substituted oxazolidinone mixture. The method further includes adding a polar protic solvent to the substituted oxazolidinone mixture, centrifuging, and filtering to produce a recovered Ni-MOF; and further washing the recovered Ni-MOF with an organochloride solvent and drying for at least 5 hours to produce a recycled Ni-MOF.

Abstract: A method of water uptake is provided. The method includes contacting a hydrogen-bonded organic framework (HOF) with water to form a mixture where the HOF comprises hydrogen bonded units of trimesic acid and guanazole. The HOF has a sheet structure, where the sheets form an intercrossed macroporous network with pores on a surface. The HOF absorbs at least a portion of the water in the mixture.

Abstract: A hydrogen-bonded organic framework (HOF) and a method of making the HOF. The HOF has at least one amine substituted organic linker and at least one carboxylic acid-based organic linker. The HOF is prepared by dissolving the linkers separately in water and mixing the aqueous solutions, without using any organic solvents, additional catalysts, or any other reagents.