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A modified molecular sieve and a method for removing phosphorus trichloride in wastewater by the modified molecular sieve

A technology of phosphorus trichloride and molecular sieve, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of increasing the difficulty of wastewater treatment, cations entering the water body, and narrow treatment application range, achieving excellent treatment effect and increasing Difficult to handle and superior adsorption performance

Active Publication Date: 2020-09-11
NANJING TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The results show that the modified zeolite has a certain phosphorus removal performance, but its adsorption capacity is limited
[0009] The method described in the "Research on Phosphorus Pollutants in Adsorption Wastewater by Modified Zeolite" adopts 4A zeolite molecular sieve, aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 O), magnesium sulfate (MgSO 4 ·7H 2 O) Mix evenly according to the ratio of 4.0:1.4:1.0 in mass ratio, add water and stir to dissolve, adjust pH=7.0, heat and dry after standing for 24 hours to carry out zeolite modification, use modified zeolite for phosphorus concentration of 50mg / L Adsorption experiments were carried out on simulated wastewater; the results showed that the magnesium-aluminum modified zeolite molecular sieve had a good adsorption effect on phosphorus-containing wastewater, and the modified zeolite had a removal rate of more than 90% for phosphorus. However, the results also showed that, As the concentration of phosphorus increases, its adsorption capacity decreases, and when the concentration of phosphorus is higher than 60mg / L, its adsorption capacity decreases significantly, and the application range of this method is narrow
[0010] In addition, related methods also include those described in the literature "Preparation of Modified Zeolite and Research on Phosphorus Removal Performance", which uses 5% sulfuric acid, polydimethyldiallyl ammonium chloride and cationic polyquaternary ammonium salt to modify zeolite. The modified zeolite is used to treat wastewater with a phosphorus concentration of 5mg / L, and the phosphorus removal rate in the wastewater can reach more than 98%. However, the phosphorus concentration of the wastewater treated by this method is 5mg / L, and the treatment range is relatively narrow.
[0011] The results show that the cation-modified zeolite has a certain degree of improvement in the adsorption performance of phosphorus, but its application range still has certain limitations; more attention should be paid to the fact that cations are easy to enter the water body during the wastewater treatment process of cation-modified zeolite , which further increases the difficulty of wastewater treatment

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  • A modified molecular sieve and a method for removing phosphorus trichloride in wastewater by the modified molecular sieve
  • A modified molecular sieve and a method for removing phosphorus trichloride in wastewater by the modified molecular sieve
  • A modified molecular sieve and a method for removing phosphorus trichloride in wastewater by the modified molecular sieve

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Effect test

Embodiment 1

[0050] Phosphorus trichloride is dissolved in water to simulate the waste water solution containing phosphorus trichloride, the concentration of phosphorus trichloride is 48mg / L, and the treatment steps of the waste water are:

[0051] (1) Molecular sieve preparation: get 5A zeolite molecular sieve raw material and grind, sieve, obtain particle diameter and be 120 mesh zeolite molecular sieve particles, spare, 5A zeolite molecular sieve is provided by Sinopharm Chemical Reagent Co., Ltd., and it belongs to calcium-A molecular sieve, effective Aperture approx. Specific surface area is 750~800m 2 / g, with a porosity of 47%, a large specific surface area, and strong adsorption capacity;

[0052] (2) Zeolite molecular sieve modification: the zeolite molecular sieve particles in the step (1) are flattened, and the power is placed under a 150W ultraviolet lamp for irradiation modification. The linear distance between the lower end of the ultraviolet light source and the molecular ...

Embodiment 2

[0056] Phosphorus trichloride is dissolved in water to simulate phosphorus trichloride-containing waste water solution, and the concentration of phosphorus trichloride is 180mg / L, and the treatment steps of described waste water are:

[0057] (1) Molecular sieve preparation: take the same 5A zeolite molecular sieve raw material as in Example 1 and grind and sieve to obtain zeolite molecular sieve particles with a particle size of 50 mesh;

[0058] (2) Zeolite molecular sieve modification: the zeolite molecular sieve particles in the step (1) are flattened, and the power is placed under a 40W ultraviolet lamp for irradiation modification. The linear distance between the lower end of the ultraviolet light source and the molecular sieve is 4 cm. Standby for 30 minutes;

[0059] (3) Wastewater pretreatment: adjust the pH of the wastewater to 7;

[0060] (4) Waste water treatment: the waste water in step (3) is added in the container, and the 5A zeolite molecular sieve particle af...

Embodiment 3

[0062] Phosphorus trichloride is dissolved in water to simulate phosphorus trichloride-containing wastewater solution, the concentration of phosphorus trichloride in the waste water is 120mg / L, and the treatment steps of the waste water are:

[0063] (1) Molecular sieve preparation: take the same 5A zeolite molecular sieve raw material as in Example 1 and grind and sieve to obtain zeolite molecular sieve particles with a particle size of 160 mesh;

[0064] (2) Zeolite molecular sieve modification: the zeolite molecular sieve particles in the step (1) are flattened, and the power is placed under a 180W ultraviolet lamp for irradiation modification. The linear distance between the lower end of the ultraviolet light source and the molecular sieve is 5 cm. Standby for 20 minutes;

[0065] (3) Wastewater pretreatment: adjust the pH of the wastewater to 4;

[0066] (4) Waste water treatment: the waste water in step (3) is added in the container, and the 5A zeolite molecular sieve p...

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Abstract

The invention discloses a modified molecular sieve and a method for removing phosphorus trichloride in waste water with the modified molecular sieve, which belong to the technical field of waste water treatment. The modified molecular sieve is prepared by the following steps: Step a), preparing particles with a 50-200-mesh 5A zeolite molecular sieve; Step b), performing radiating modification on the particles prepared with the 5A zeolite molecular sieve with an ultraviolet source, wherein in the step of modification, the particles prepared with the 5A zeolite molecular sieve are placed at the position which is 1-5cm from the lower end of the ultraviolet source linearly for radiating, the power of the ultraviolet source is 40W-200W, and the radiating time is 5min-30min; placing the 5A zeolite molecular sieve into the waste water for adsorbing phosphorus trichloride, wherein the treatment temperature is 25-45 DEG C. the method is simple and convenient in operation, excellent in effect and high in efficiency, is environment-friendly and has great value in the field of phosphorus waste water treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for removing phosphorus from wastewater, more specifically, to a method for removing phosphorus trichloride in wastewater by ultraviolet modified molecular sieves. Background technique [0002] With the rapid development of social economy and the rapid development of science and technology, many environmental problems have emerged one after another, among which water environment problems are particularly serious. Phosphorus is one of the main factors causing water environment problems. How to effectively reduce the concentration of phosphorus in sewage and protect the ecological environment is of great significance. [0003] Molecular sieves have a basic skeleton structure composed of silicon oxide and aluminum oxide tetrahedrons, and there are metal cations (such as Na+, K+, Ca 2+ , Li+, etc.) to balance the excess negative charge in the crystal. The types ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/16B01J20/30C02F1/28C02F101/10C02F101/12
CPCC02F1/281C02F1/66C02F2101/105C02F2101/12
Inventor 李磊李秀文蔡婧胡梦张雨桐芦津
Owner NANJING TECH UNIV