Preparation method of self-purification cascade ring filler

Abstract

The invention relates to a preparation method of a self-purification cascade ring filler, and belongs to the field of water pollution purification materials. The method comprises the following process steps: pickling and activating a ceramic cascade ring, spraying a neodymium-niobium-zinc precursor on the surface of the ceramic cascade ring by adopting a thermal spraying method, and coating a neodymium-niobium-zinc composite oxide active coating on the surface of the ceramic cascade ring through a series of drying and calcining processes. The coating accounts for 3.6%-3.9% of the self-purification cascade ring filler in percentage by mass, and the self-purification cascade ring filler has high activity of decomposing organic pollutants. The filler can stably remove organic pollutants in sewage for a long time, does not need to be frequently maintained and regenerated in the use process, and has a wide application prospect in the actual wastewater treatment process.

Claims

1. A method for preparing a self-purifying step ring packing, characterized in that: The process steps include: Step 1: Activate the Ceramic Step Ring The ceramic step ring is immersed in a 0.1 mol / L hydrochloric acid solution, heated to 75°C, and kept warm for 60 minutes to remove impurities on the ceramic step ring, and the surface of the ceramic step ring is roughened by dissolving part of the surface aluminum oxide component of the ceramic step ring; then washed with pure water, and dried at 110°C for 6 hours to obtain an activated ceramic step ring; Step 2: Prepare the Nd-Nb-Zn precursor (1) Add 3.5-3.7 g of emulsifier OP-7, 5.2-5.8 g of neodymium nitrate hexahydrate (NdN3O9·6H2O), and 4.7-5.1 g of Niobium oxide (C 10 H5B 20 ), stirring to form solution A; (2) Add 6.5-7.3 mL of triethanolamine and 15-17 g of zinc stearate (C) to 200 mL of ethanol. 36 H 70 O4Zn), stirring to form solution B; (3) mixing solution A and solution B, and stirring to form a neodymium-niobium-zinc precursor; Step 3: Applying the composite oxide coating (1) heating the neodymium-niobium-zinc precursor to 60° C. and spraying it onto the surface of the activated ceramic step ring in step 1 at a flow rate of 10 mL / min using a constant flow pump until the surface of the activated ceramic step ring is completely and evenly sprayed; (2) The activated ceramic step ring after spraying is dried at 120° C. for 6 h, then calcined at 350-370° C. for 2 h, and then calcined at 520-560° C. for 3 h to obtain a self-purifying step ring packing.

2. The method for preparing a self-cleaning step ring packing according to claim 1, characterized in that: The ceramic step ring is made of alumina ceramics, with an outer diameter of 25 to 76 mm and a specific surface area of ​​75 to 210 m 2 / m 3 The porosity is 73% to 78%, and the bulk weight is 530 to 650 kg / m 3 .

3. The method for preparing a self-cleaning step ring packing according to claim 1, characterized in that: The self-purifying step ring filler is coated with a neodymium-niobium-zinc composite oxide active coating on the surface of a ceramic step ring, and the coating accounts for a total mass percentage of 3.6% to 3.9% of the self-purifying step ring filler; the mass percentages of the three oxides of neodymium oxide, niobium oxide and zinc oxide in the coating are 39.0% to 39.3%, 22.3% to 22.8% and 37.9% to 38.7% respectively.

4. The method for preparing a self-cleaning step ring packing according to claim 1, characterized in that: The specific surface area of ​​the self-purifying step ring packing is 105 to 233 m 2 / m 3 , the porosity is 75% to 77%.