Stationary phase materials for performing size exclusion chromatography are provided. The stationary phase materials include porous inorganic-organic hybrid particles surface-modified with a hydroxy-terminated polyethylene glycol silane.

A powdered Iron-Selenide-Oxide sorbent composition, a method of using the sorbent, and a method for producing the sorbent is disclosed for removing mercury vapor from a gaseous stream. The exact ratios of Fe to Se are varied. The method for producing the sorbent comprises the steps of: preparing a base ferrous or ferric oxide (FeO.sub.x) media, conditioning the FeO.sub.x media with a slurry of ferrous selenite (FeSeO.sub.3)/ferrous selenate (FeSeO.sub.4), reducing the FeSeO.sub.3/FeSeO.sub.4 mixture by an elemental iron (Fe.sup.0) powder to incorporate selenide into the slurry, and dewatering and oxidizing the slurry. The sorbent can be used alone (or in combination with a powdered activated carbon material or an inert powdered material) by direct injection into the Hg-containing gas stream, by coating of a filter fabric used in bag house with the sorbent, or by using the sorbent in a packed bed gas stream filtration system.

A thermal management system includes a sublimator that has a porous plate, a water feed line connected with the sublimator for delivering feed water to the porous plate, and an adsorbent bed in the water feed line. The sublimator is operable to freeze and sublime the feed water using the porous plate. The adsorbent bed is configured to substantially remove organic compounds from the feed water.

The present invention provides a chromatographic separating agent which exhibits excellent performances in separation of organic compounds, such as reducing sugars without formation of Schiff bases and anomer separation in analysis of saccharides. The chromatographic separating agent includes a porous substrate surface-modified with silane functional groups represented by the formula:

##STR00001## wherein R.sub.1 represents an alkylene group or oxyalkylene group having a carbon number of 1 to 10. R.sub.2 and R.sub.3 independently represent an alkylene group or alkyleneoxyalkylene group having a carbon number of 1 to 6.

Carbonaceous material that is activated to form precursor activated carbon is further enhanced by doping with iron and nitrogen and calcining. The resultant sorbent material has excellent catalytic properties which are useful in the field of fluid purification. The further enhancement can be performed in a single stage process or a dual stage process. The carbonaceous material includes those obtained from coal, wood, or coconut shells. The described treatment processes result in a sorbent material that has excellent performance in removing chloramine and similar compounds from fluids such as water that is intended for drinking.

Carbonaceous material that is activated to form precursor activated carbon is further enhanced by doping with copper, iron, and nitrogen and calcining. The carbonaceous material includes those obtained from coal, wood, or coconut shells. Methods of doping the activated carbon are described. The described treatment processes result in a sorbent material that has excellent performance in removing chloramine and similar compounds from fluids such as water that is intended for drinking.

A method of making a nanocomposite is provided. The method includes dispersing nanocellulose and nano-bentonite in water and mixing to form a mixture. The method includes drying by heating the mixture at a temperature of at least 40? C. to form a dry mixture. The method further includes mixing the dry mixture with an alkylamine to form a nanocomposite composition. The method includes heating the nanocomposite composition at a temperature of at least 100? C. to form a paste. The method includes drying and milling the paste to form the nanocomposite. The nanocellulose is prepared from date-palm tree leaflets. The nano-bentonite is prepared from Saudi Arabia bentonite clay from the Khulays Mine. A method of treating water with the nanocomposite prepared by the method of the present disclosure is also provided.

Silica particles have a fine pore size of 1 to 250 Angstrom (?) and comprise a silane group which comprises two groups which are each independently chosen from alkyl, aryl, alkylaryl, heteroalkyl, heteroaryl, and heteroalkylaryl groups. The silica particles are prepared by a method. The silica particles can be used as a stationary phase for purifying a modified conjugated peptide, such as a GLP-1 agonist or a GLP-2 analog.

A polymer/activated carbon composite made up of a branched polyethylenimine and magnetic cores involving Fe.sub.3O.sub.4 disposed activated carbon. The magnetic cores have activated carbonyl groups on the surface. A process for removing organic dyes, such as methyl red, as well as heavy metal ions from a polluted aqueous solution or an industrial wastewater utilizing the composite is introduced. A method of synthesizing the polymer/activated carbon composites is also specified.

The present disclosure is directed to stationary phase materials (e.g., porous inorganic-organic hybrid particles) for performing size exclusion chromatography. Embodiments of the present disclosure feature hydroxy-terminated polyethylene glycol surface modified stationary phase materials.