A porous porphyrin polymer and a method of recovering precious metal elements using the same are described. A porous porphyrin polymer represented by Formula 1 has high selectivity for precious metal elements and a high ability to adsorb precious metal elements, and can be applied to the recovery of precious metal elements either from metal leachates of waste electronic products or from river water or seawater.

A method for producing a modified sawdust sorbent. The method involves sulfonating sawdust with sulfuric acid and oxidizing the sulfonated sawdust with hydrogen peroxide. The method yields a modified sawdust sorbent containing sulfonated and oxidized cellulose. The modified sawdust sorbent has a higher surface area, higher organic dye adsorption capacity, and more rapid organic dye adsorption rate than unmodified sawdust. Also disclosed is a method of using the modified sawdust sorbent for organic dye removal from water.

The disclosure discloses an irreversible covalent organic framework for efficient and selective gold recovery and a preparation method thereof, and belongs to the technical field of precious metal recovery from an aqueous solution. In the disclosure, metal trifluoromethanesulfonate is used as a catalyst, and a solvothermal method is used to prepare a mother covalent organic framework, and then the corresponding structural unit is used to perform an exchange reaction to prepare an irreversible amide-linked covalent organic framework material. The disclosure solves the problem of preparation of high-stability irreversible covalent organic framework, the introduced amide bond gives the covalent organic framework the ability to quickly and selectively recover precious metal gold from an aqueous solution, and the covalent organic framework can be used repeatedly. The application of the covalent organic framework as an efficient adsorbent in the field of adsorption and separation is expanded, and a new material is provided for efficient recovery or removal of metal salts.

This invention relates to a Cu-BTC MOF which is water stable. The Cu-BTC MOF has been modified by substituting some of the BTC ligand (1,3,5, benzene tricarboxylic acid) with 5-aminoisophthalic acid (AIA). The resultant MOF retains at least 40% of its as synthesized surface area after exposure to liquid water at 60 C. for 6 hours. This is an unexpected result versus the MOF containing only the BTC ligand. This MOF can be used to abate contaminants such as ammonia in gas streams and especially air streams.

This invention relates to a Cu-BTC MOF which is water stable. The Cu-BTC MOF has open coordination sites and has been post synthesis modified by partially occupying the open sites with a ligand such as acetonitrile (CH.sub.3CN). The resultant MOF retains at least 40% of its as synthesized surface area after exposure to liquid water at 60 C. for 6 hours. This is an unexpected result versus the MOF which has not been post treated with ligands such as acetonitrile. This MOF can be used to abate contaminants such as ammonia in gas streams and especially air streams.

Three dimensional (3D), porous, Sr(II)/Ir(III) layered double hydroxide materials with a spherical/balls like shape, are composed of nanohexagonal sheets intercalated with 1-(1-hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid have a number of uses including removing undesirable organic compounds and materials from polluted water. This removal can be accomplished without disturbing the pH of the water, and with high absorption capacity (2000 mg of pollutants/1 mg of LDH). The spherical/ball like materials are easily cleaned and are amenable to being reused several times.

Three dimensional (3D), porous, Sr(II)/Ir(III) layered double hydroxide materials with a spherical/balls like shape, are composed of nanohexagonal sheets intercalated with 1-(1-hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid have a number of uses including removing undesirable organic compounds and materials from polluted water. This removal can be accomplished without disturbing the pH of the water, and with high absorption capacity (2000 mg of pollutants/1 mg of LDH). The spherical/ball like materials are easily cleaned and are amenable to being reused several times.

A method includes preparing a natural seashell, calcining the seashell at a high temperature to clear organic substances from the seashell, processing and reacting the seashell at a high temperature, grinding and screening the seashell, and mixing the ground seashell with microorganism strains to form a water deodorizer. The water deodorizer includes a powder having a porous structure, and multiple microorganism strains mixed with the powder. The powder has an interior provided with a plurality of pores. The powder is made of a natural seashell which is processed at a high temperature, and is ground and screened to form the porous structure. The microorganism strains are filled in the pores of the powder and cover outer surfaces of the pores of the powder. The powder has a diameter of 0.4-10 m.

A method includes preparing a natural seashell, calcining the seashell at a high temperature to clear organic substances from the seashell, processing and reacting the seashell at a high temperature, grinding and screening the seashell, and mixing the ground seashell with microorganism strains to form a water deodorizer. The water deodorizer includes a powder having a porous structure, and multiple microorganism strains mixed with the powder. The powder has an interior provided with a plurality of pores. The powder is made of a natural seashell which is processed at a high temperature, and is ground and screened to form the porous structure. The microorganism strains are filled in the pores of the powder and cover outer surfaces of the pores of the powder. The powder has a diameter of 0.4-10 m.

Disclosed are adsorbent compositions including a recoverable and reusable polypeptidylated hemoglobin iron composite and methods of using the compositions to adsorb and/or remove contaminant compounds from water involving contacting the water with an effective amount of the composition to remove the contaminant compounds.