49results about How to "Rich void structure" patented technology

The invention belongs to the fields of materials and catalysis and relates to a preparation method of surface-modified g-C3N4. The preparation method comprises the following steps: firstly, creatively carrying out direct high-temperature reaction on sodium halide, potassium halide or a mixture of sodium halide and potassium halide and g-C3N4; introducing water in the reaction process and enabling the modified g-C3N4 to contain hydroxide radicals; modifying corresponding metal ions on the surface of the modified g-C3N4. The method has the characteristics of simple operation, easiness in realization, low-priced and easily-obtained reaction raw materials, environment friendliness, high yield of the modified g-C3N4 and the like; in addition, abundant hydroxide radicals and porous structures on the surface of the modified g-C3N4 surface can generate abundant hydroxyl free radicals under visible light; the characteristics lay a foundation for actual application of the modified g-C3N4 in the field of photocatalysis.

The invention discloses a preparation method of butterfly-tie-shaped cerium dioxide, and relates to the preparation method of the cerium dioxide. The preparation method aims to solve the technical problems that the morphology of the cerium dioxide prepared by preparation methods in the prior art is mainly rod-shaped, line-shaped, tube-shaped and spherical. The preparation method comprises the following steps: first, mixing Ce(NO3)3.6H2O and L-cysteine, adding into distilled water and stirring until the Ce(NO3)3.6H2O and the L-cysteine are completely dissolved, then adding NaOH, and continuing to stir for 30 min to obtain a mixed liquid; and second, transferring the mixed liquid into a reaction kettle for reaction, naturally cooling to the room temperature, washing a sample with the distilled water until the sample being free of impurity, filtering, drying, and then calcining, thus obtaining the butterfly-tie-shaped cerium dioxide. The butterfly-tie-shaped cerium dioxide prepared by the preparation method is butterfly-tie-shaped, and both ends of the butterfly-tie-shaped cerium dioxide are bound-branch-shaped, the sample has complete morphology, the size is about 18 [mu]m, the size distribution is uniform, both ends of the sample are multilevel structures, and have pore structures. The preparation method belongs to the field of preparation of oxides.

The invention discloses a method for in situ fixation of vanadium ore polluted soil by modified charcoal and belongs to the technical field of soil in-situ remediation. The method comprises the following steps: 1, after harvested plants in vanadium ore polluted sites are pretreated, the pretreated plants are subjected to pyrolysis at 450-550 DEG C under the nitrogen protection, the pyrolysis time lasts for 30 min, then nitrogen is introduced continuously, the mixture I is cooled to room temperature to obtain solid particles, and the solid particles are cleaned and then dried at 60 DEG C to obtain charcoal particles for standby application; 2, calcium hydrophosphate is dissolved in dilute nitric acid with the mass concentration being 5%, calcium hydrophosphate and the dilute nitric acid are sufficiently mixed according to the the molar ratio of (1-3):1; 3, the charcoal particles are added in a calcium hydrophosphate-nitric acid mixing system according to the fact that 1 g of charcoal particles are added into 40-60 ml of calcium hydrophosphate-nitric acid mixing system, and ultrasonic treatment is performed for 20 min; 4, the mixture II is filtered, and the filtered substance is cleaned and dried at 55 DEG C to obtain modified charcoal; 5, the modified charcoal is sufficiently mixed with soil samples at the mass ratio of 1%-3%, the soil field capacity is kept to be 60%, and maintenance is carried out for 30 days. A soil leaching experiment result shows that compared with the leaching toxicities of heavy metals namely V, Cr and Pb of soil which is not fixed by modified charcoal, the leaching toxicities of heavy metals namely V, Cr and Pb of the soil fixed by modified charcoal are respectively reduced by 70%, 50% and 35%.

The invention relates to the technical field of cigarettes, in particular to a tobacco additive and the application thereof. The tobacco additive is prepared from the following raw materials in partsby weight: 8-45 parts of propylene glycol and vegetable glycerol, and 1-5 parts of tobacco extract. The tobacco additive provided by the invention effectively inhibits the sweet greasy feeling of smoke caused by the addition of PG and VG, greatly enhances the smoking taste, and improves the fragrance during smoking. Therefore, the smoke is softer.