The present invention relates to a self-assembled composite of carbon nitride and graphene oxide, and in particular, to including a self-assembled composite prepared by heat treating a mixed solution dissolving melamine, tri-thiocyanuric acid and graphene oxide (GO) in a positive electrode of a lithium-sulfur battery to suppress elution of lithium polysulfide. According to the present invention, the self-assembled composite containing a pyridinic group in large quantities and having improved conductivity adsorbs lithium polysulfide eluted from a positive electrode during charge and discharge and performs a role of preventing diffusion of the lithium polysulfide, and therefore, lithium-sulfur battery capacity and lifecycle properties can be enhanced by suppressing a shuttle reaction.

Shale processing systems may include a reactor comprising. a first inlet in fluid communication with a shale gas source. a plasma zone in fluid communication with the first inlet, the plasma zone comprising, an outlet in fluid communication with the plasma zone, a collection vessel configured to receive fluid from the reactor outlet, and a voltage supply and monitor system in electrical communication with the inner electrode and with the outer electrode. The shale gas processing systems may be configured to generate various fluid products, including nitrogen (N)-containing compounds.

A hollow porous carbon nitride nanospheres composite loaded with AgBr nanoparticles, preparation method thereof, and its application in dye degradation are disclosed. Using silica nanosphere with core-shell structure as a template and hydrogen cyanamide as precursor, melting to enter the pores of mesoporous silica, after calcination, the silica template is etched with ammonium bifluoride to obtain hollow porous carbon nitride nanospheres; dispersing hollow porous carbon nitride nanospheres in deionized water, adding silver nitrate and sodium bromide in sequence, and obtaining silver bromide nanoparticles by in-situ ion exchange method, stirring, washing and centrifuging to obtain the hollow porous carbon nitride nanospheres composite. The hollow porous carbon nitride prepared by the template method has good photocatalytic effect on dye degradation after composite with silver bromide; and it has the advantages of easy production of raw materials, good stability, reusability, etc. It has application prospects in the treatment of dyes.

In some aspects and embodiments, the present application provides a wide range of porous 1-D polymeric graphitic carbon-nitride materials that are atomically doped with binary metals in different morphologies. In some embodiments, the graphitic carbon-nitride materials can be prepared with high mass production from inexpensive and natural abundant precursors. In some embodiments, the materials were used successfully for the oxidation of CO to CO.sub.2 under ambient reaction temperature in addition to the reduction of CO.sub.2 into hydrocarbons. In some embodiments, the materials can be used for practical and large-scale gas conversion for household or industrial applications.

Certain embodiments of the invention are directed to nitrogen rich two dimensional hexagonal C.sub.3N.sub.4.6 mesoporous graphitic carbon nitride (gMCN) material formed from cyclic amino-triazole precursors, the gMCN having a rod shape morphology and an average pore diameter between 4 to 6 nm.

A method for preparation of mesoporous nitrogen-doped carbon includes forming a composition by solubilizing a nitrogen-containing polymer in an aqueous solution of ZnCl.sub.2 and drying the aqueous solution, the method further includes heating the composition after drying to a temperature sufficiently high to carbonize the nitrogen-containing polymer to form the mesoporous nitrogen-doped carbon.

The present invention is directed to crystalline solids having an empirical formula of M.sub.2A.sub.2X, wherein M is at least one Group IIIB, IVB, VB, or VIB metal, preferably Cr, Hf, Sc, Ti, Mo, Nb, Ta, V, Zr, or a combination thereof; wherein A is Al, Ga, Ge, In, Pb, or Sn, or a combination thereof; and each X is C.sub.xN.sub.y, where x+y=1. In some particular embodiments, the crystalline composition has a unit cell stoichiometry of Mo.sub.2Ga.sub.2C.

A method for preparation of mesoporous nitrogen-doped carbon includes forming a composition by solubilizing a nitrogen-containing polymer in an aqueous solution of ZnCl.sub.2 and drying the aqueous solution, the method further includes heating the composition after drying to a temperature sufficiently high to carbonize the nitrogen-containing polymer to form the mesoporous nitrogen-doped carbon.

Disclosed are a honeycomb-like homo-type heterojunction carbon nitride composite material and a preparation method thereof, and an application of the honeycomb-like homo-type heterojunction carbon nitride composite material in catalytic treatment of waste gas. The preparation method includes the following steps: with two different carbon nitride precursors namely urea and thiourea as raw materials, weighing certain amounts of the urea and the thiourea, adding the urea and the thiourea into a crucible, adding a certain amount of ultrapure water, placing the crucible in a muffle furnace, and carrying out calcination molding. The honeycomb-like homo-type heterojunction carbon nitride prepared by the one-step method has good photocatalytic effect to catalytic degradation of NO; meanwhile, the honeycomb-like homo-type heterojunction carbon nitride composite material has the advantages of rich and easily-available production raw materials, good stability, reusability, etc., and has application prospects in the field of treatment of NO in the air.

The invention discloses a composite material used for catalyzing and degrading nitrogen oxide and its preparation method and application thereof. The invention of the hollow g-C.sub.3N.sub.4 nanospheres/reduced graphene oxide composite-polymer carbonized nanofiber material is prepared as follow: 1) the preparation of silica nanospheres; 2) the preparation of hollow g-C.sub.3N.sub.4 nanospheres; 3) the preparation of graphene oxide; 4) the preparation of surface modified hollow g-C.sub.3N.sub.4 nanoparticles preparation; 5) the preparation of composites; 6) the preparation of composite-polymer carbon nanofiber material. The raw materials used in the process is low cost and easy to get; the operation of the invention is simple and convenient without the use of expensive equipment in the whole process; the composite has high adsorption efficiency of ppb level nitrogen oxide with good repeatability.