Superhydrophobic cotton fabric membrane prepared by fluoropolymers and modified nano-SiO used for oil/water separation.

At present, the preparation methods of oil-water separation membranes include chemical vapor deposition, electrospinning, atom transfer radical polymerization, Basically, they all have issues of low recycling rate and incontinuous use. In this paper, the epoxy polymer P(GMA--MMA) obtained by traditional radical polymerization of glycidyl methacrylate (GMA) monomer and methacrylic acid (MMA) monomer, and pentafluoropropionic acid (PFPA) is used to modify polymer P(GMA--MMA) to obtain fluorine-containing epoxy polymer P(GMA--MMA)--PFPA. Secondly, fluorine-containing epoxy polymer P(GMA--MMA)--PFPA and amino-modified nano SiO is blended, and the cotton fabric is dip-coated to obtain a superhydrophobic surface, thereby preparing an oil-water separation membrane.

Stable Immobilization of Enzymes in a Macro- and Mesoporous Silica Monolith.

Horseradish peroxidase isoenzyme C (HRP) and proteinase K (proK) were immobilized inside macro- and mesoporous silica monoliths. Stable immobilization was achieved through simple noncovalent adsorption of conjugates, which were prepared from a polycationic, water-soluble second generation dendronized polymer (denpol) and the enzymes. Conjugates prepared from three denpols with the same type of repeating unit (r.

Thiocarbamide and microwave-accelerated green methylation of cassava starch with dimethyl carbonate.

By combining the acceleration strategies of using thiocarbamide as a active catalyst, incorporating dimethyl carbonate (DMC) as a solvent and methylating reagent and applying microwave irradiation as energy resource, methylation of cassava starch can be performed efficiently to a high degree of substitution (DS=0.6) within 4 min. The structures of native cassava starch and methylated starch were characterized by (13)C NMR spectroscopy.

Microwave-assisted methylation of cassava starch with dimethyl carbonate.

A novel and environmentally friendly process for the methylation of cassava starch with dimethyl carbonate (DMC) could be accelerated by employing a combined strategy: using disodium hydrogen phosphate (Na(2)HPO(4)) as the catalyst (chemical means) and microwave irradiation as the energy source (physical means). By varying the volume of 5% sodium chloride aqueous solution between 50 and 150 mL, the amount of Na(2)HPO(4) between 0 and 1.25 g, the volume of DMC between 75 and 200 mL, and the microwave time from 5 to 20 min, methyl cassava starch with degree of substitution (DS) values in the range of 0.