Sulfur-containing repairing agent, application and preparation method thereof

A repairing agent, thioglycolic acid technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of easy collapse of melamine foam and reduced opening rate, and achieve fast and efficient adsorption. processing effect

Pending Publication Date: 2020-06-30
龚成云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of literatures have reported the synthesis method of mercapto compound modified adsorbent. The commonly used method is to use the hydrothermal method to synthesize, but the melamine foam is easy to collapse under the high temperature and high pressure of the water phase, and the porosity is greatly reduced.

Method used

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  • Sulfur-containing repairing agent, application and preparation method thereof
  • Sulfur-containing repairing agent, application and preparation method thereof
  • Sulfur-containing repairing agent, application and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Configure Hg with an initial concentration of 15mg L-1 2+ solution, take out multiple 200mL solutions, adjust the pH value in the range of 2.0 to 6.0 with sodium hydroxide and nitric acid, weigh about 10 mg of sulfur-containing repair agents and add them to the Hg of the above-mentioned different pH values. 2+ In the solution, shake in the shaker for 120 min, take out the adsorbent with tweezers, take the supernatant and centrifuge and test the Hg of the centrate with ICP 2+ concentration.

[0023] Test results such as Figure 5 As shown, the results show that under different pH conditions, the effect of three-dimensional honeycomb sulfur-containing repair agent on Hg 2+ The adsorption capacity increases gradually with the increase of solution pH. The test range with a maximum pH value of no more than 6 was chosen because at a pH value greater than 6, Hg 2+ will react with OH in aqueous solution - Combine and form a precipitate. Hg 2+ The change of adsorption amo...

Embodiment 2

[0025] At pH 6, add 200 mL of Hg with a concentration of 15 mg L-1 into a 250 mL beaker 2+ Add about 10 mg of sulfur-containing repair agent to the solution, place the beaker on a magnetic stirrer and stir, during the adsorption process, each time interval (0, 3, 5, 10, 15, 30, 45, 60 and 120min) Take 2 mL of the supernatant and centrifuge quickly, filter through a 0.22 μm filter membrane, and measure Hg in the filtrate by ICP 2+ concentration.

[0026] Test results such as Figure 6 As shown, it can be seen from the figure that the effect of sulfur-containing repair agents on Hg 2+ The equilibrium adsorption capacity reached 273.22mgg-1, which is much higher than the existing literature reports, and it also has great advantages compared with other materials. At the same time, the repair agent has an effect on Hg 2+ The adsorption can reach equilibrium adsorption within 30 minutes, showing a faster adsorption rate, which has great practical significance for the treatment o...

Embodiment 3

[0028] Configure 200mL 3mg L-1, 5mg L-1, 10mg L-1, 15mg L-1, 20mg L-1, 30mg L-1Hg 2+ Solution, adjust the pH value to 6, then add about 10mg of sulfur-containing repair agent, shake in the shaker at 25°C for 120min, take out the block repair agent, take the supernatant and centrifuge, use ICP to measure Hg before and after adsorption 2+ concentration.

[0029] Sulfur-containing remedial agents increase with Hg at lower concentrations 2+ As the concentration increases, the adsorption capacity increases continuously, and gradually reaches saturation when the concentration exceeds 15 mg L-1, and the maximum adsorption capacity remains at about 270 mg g-1.

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Abstract

The invention provides a sulfur-containing repairing agent. According to the sulfur-containing repairing agent, melamine foam and mercaptoacetic acid are used as raw materials, the melamine foam is treated with mercaptoacetic acid, then high-temperature calcination treatment is conducted, and a three-dimensional honeycomb-shaped sulfur-containing repairing agent is prepared, wherein the microscopic unique honeycomb-shaped structure and the macroscopic blocky material form of the melamine foam are kept, and sulfur elements already exist and are evenly distributed in the melamine foam; and the sulfur-containing repairing agent is applied to adsorption treatment of mercury wastewater. According to the invention, melamine foam which is low in price and easy to obtain serves as a raw material,a microcosmic unique honeycomb structure and a macroscopic blocky material form are still kept after a sulfur element is introduced through a simple and convenient method, the sulfur element is evenlydistributed in the melamine foam, and the sulfur-containing repairing agent can be used for rapid and efficient adsorption treatment of Hg<2+> in mercury-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of heavy metal sewage treatment, and in particular relates to a medicament. Background technique [0002] Mercury (Hg 2+ ) is a heavy metal pollutant with strong biological toxicity in the environment. It can enter the human body through water, air, food and other ways, causing damage to the brain, spinal cord, kidney and liver of the human body. In recent years, the problem of mercury pollution has become increasingly serious. How to quickly, efficiently and easily separate Hg 2+ Removal from sewage is an important problem. Currently, for Hg in sewage 2+ A variety of technologies have been developed for the treatment of these technologies. However, there are still many limitations and inconveniences in the actual application process of these technologies. The treatment efficiency is relatively low, and the recovery of traditional adsorbents in the adsorption method is difficult. Therefore, looking for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/28C02F1/28B01J20/30C02F101/20
CPCB01J20/0285B01J20/28045C02F1/283C02F2101/20
Inventor 龚成云
Owner 龚成云
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