Shanghai Jiao Tong University

Jinming Luo

Kaixing Fu

Chunyu Lv

Nanwen Zhu

Jinjing Huang

Yitao Pan

The present disclosure provides a preparation method of a porous hydrogel adsorbent based onresidues, including the following steps: subjecting residues of Chinese herbal medicineas a precursor to bleaching with NaClO, alkaline washing with KOH, and high power ultrasonic treatment, thereby obtaining a precursor solution of uniformly dispersed cellulose nanofibers (CNFs); adding the precursor solution of CNFs to a mixed solution of N,N'-methylene bisacrylamide (MBA), acrylic acid (AA) and ammonium persulfate (APS), shaking evenly, and initiating a polymerization reaction at a predetermined temperature to form a monolithic gel; and cleaning the monolithic gel, putting the cleaned monolithic gel into a dimethyl sulfoxide (DMSO) solution containing epichlorohydrin to allow reaction, and transferring the product of the reaction to an aqueous sodium hydroxide solution containing triethylene tetramine to allow reaction, thereby finally obtaining an amino-functionalized porous hydrogel adsorbent.

Preparation method and application of porous hydrogel adsorbent based on Radix Astragali residue

Disclosed are a quaternized cellulose-based resin and a preparation method and application thereof. Cellulose extracted from traditional Chinese medicine waste residues is subjected to functional modification, and then grafted to a surface of chloromethylated polystyrene, so as to obtain the quaternized cellulose-based resin. The preparation method does not involve toxic reagents, is green and environment-friendly, is low in cost, and effectively prevents and controls PFAS pollution while realizing harmless treatment and resource utilization of solid wastes, thus ensuring the safety of drinking water. The quaternized cellulose-based resin comprises the chloromethylated polystyrene and the quaternized cellulose modified on the surface of the chloromethylated polystyrene. The quaternized cellulose-based resin is easy to recover, is used on a large scale, solves the problem that a powder adsorbent is difficult to recover and use on a large scale, has good stability, and effectively removes trace perfluorinated substances in drinking water.

Quaternized cellulose-based resin and preparation method and application thereof

Provided are a hierarchical porous defect UiO-66 material and a preparation method thereof. The method includes the following steps: mixing a zirconium ion source, a mixed ligand, an organic acid, an organic good solvent, and water to obtain a mixture; and subjecting the mixture to reaction while heating, washing, freeze-drying, and heat treatment in sequence to obtain the hierarchical porous defect UiO-66 material; where hierarchical pores of the hierarchical porous defect UiO-66 material comprise micropores and mesopores; the micropores each have a pore size of not greater than 2 nm; the mesopores each have a pore size of 2 nm to 4 nm; the mixed ligand includes terephthalic acid and a trisubstituted benzene series; and the trisubstituted benzene series is one or two selected from the group consisting of 2-aminoterephthalic acid and 2-aminoisophthalic acid.

Hierarchical porous defect UiO-66 material and its preparation method

Disclosed are a sulfur-molybdenum cluster modified MOF material and a preparation method and application thereof, and the material is prepared by taking an MOF material as a metal organic framework material, and modifying ammonium tetrathiomolybdate inside the metal organic framework material; and according to the mass percentage, the MOF material accounts for 45 wt % to 90 wt %, and a modification amount of the ammonium tetrathiomolybdate accounts for 10 wt % to 55 wt %. The ammonium tetrathiomolybdate is embedded into an MOF material framework in a solution in a form of an anion MoSfor modification. According to the invention, the MOF material is modified by the ammonium tetrathiomolybdate, and compared with an existing sulfydryl modified composite material, the modified composite material shows a higher adsorption capacity, a higher adsorption rate and a higher S atom effective utilization rate in the application of removing Hg (II) in water, and meets a wider practical application scene.

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Shanghai, China

Jinming Luo