Molybdenum disulfide activated carbon fiber composite adsorbent for deeply purifying lead-containing wastewater and preparation method of molybdenum disulfide activated carbon fiber composite adsorbent

A technology of activated carbon fiber and molybdenum disulfide, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve problems that are difficult to recycle, cannot be applied to fixed bed water treatment devices, and nano-scale molybdenum disulfide is easy to agglomerate and other problems to achieve the effect of preventing loss, ensuring practical application value, and excellent adsorption selectivity

Pending Publication Date: 2022-03-01
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems that the existing nano-scale molybdenum disulfide is easy to agglomerate and difficult to recycle in water, and cannot be applied to water treatment devices such as fixed beds, the present invention provides a molybdenum disulfide activated carbon fiber composite adsorption for deep purification of lead-containing wastewater. Agents and their preparation methods

Method used

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  • Molybdenum disulfide activated carbon fiber composite adsorbent for deeply purifying lead-containing wastewater and preparation method of molybdenum disulfide activated carbon fiber composite adsorbent
  • Molybdenum disulfide activated carbon fiber composite adsorbent for deeply purifying lead-containing wastewater and preparation method of molybdenum disulfide activated carbon fiber composite adsorbent
  • Molybdenum disulfide activated carbon fiber composite adsorbent for deeply purifying lead-containing wastewater and preparation method of molybdenum disulfide activated carbon fiber composite adsorbent

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Effect test

Embodiment 1

[0029] The preparation method of molybdenum disulfide activated carbon fiber composite adsorbent in the present embodiment is as follows:

[0030] (1) Utilize the plant pulverizer to pulverize the activated carbon fiber felt into uniform short fibers, wash and dry with deionized water. (2) Add the treated activated carbon fiber into the dopamine hydrochloride solution with a concentration of 2g / L at pH8.4-8.5, wherein the mass ratio of activated carbon fiber to dopamine hydrochloride is 1:1, and the dopamine hydrochloride solution is buffered with 10mM Tris-HCl Solution preparation; then the mixture was placed in a shaker, shaken at 25°C for 24h, the obtained product was washed alternately with deionized water and ethanol three times, and then dried in a drying oven at 60°C for 12h. (3) Add the compound obtained in step (2) into (NH 4 ) 6 Mo 7 o 24 4H 2 O and CN 2 h 4 In the mixed solution of S, wherein activated carbon fiber, (NH 4 )6 Mo 7 o 24 4H 2 O and CN 2 h ...

Embodiment 2

[0033] Prepare Pb with a certain concentration range from 20mg / L to 500mg / L 2+ solution, respectively add 25mg composite material to 50mL Pb with different concentrations above 2+ In the solution, at a temperature of 25°C, vibrate in a shaker at a speed of 160r / min for 24 hours to balance, then take its supernatant, measure its concentration at equilibrium with an inductively coupled plasma emission spectrometer (ICP), and calculate Under these conditions, molybdenum disulfide activated carbon fiber composites are effective against Pb 2+ The adsorption capacity can reach 393mg / g.

Embodiment 3

[0035] Prepare 2 different sets of competing ion solutions to ensure Pb 2+ Concentration is 100mg / L, where Ca 2+ , Mg 2+ Concentration and 100mg / L of Pb respectively 2+ The molar ratios are 0, 5, 10, 20, 40, 60, 100, respectively. Add 25mg of composite materials to 50mL of the above different solutions, shake in a shaker at a speed of 160r / min for 24 hours at a temperature of 25°C until equilibrium, then take the supernatant, and measure its equilibrium concentration by ICP. The results showed that in the presence of a large amount of calcium and magnesium ions, the removal efficiency of molybdenum disulfide activated carbon fiber composites for lead remained stable, showing excellent adsorption selectivity.

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Abstract

The invention provides a molybdenum disulfide activated carbon fiber composite adsorbent for deeply purifying lead-containing wastewater and a preparation method of the molybdenum disulfide activated carbon fiber composite adsorbent. The composite adsorbent has a sandwich multilayer structure: activated carbon fiber is used as a carrier, a polydopamine coating is arranged in the middle, and a compact molybdenum disulfide nanosheet is arranged on the outermost layer. The technical bottleneck that solid-liquid separation of nanoscale molybdenum disulfide powder is difficult in practical engineering application is solved, the activated carbon fiber with large specific surface area and length-diameter ratio is used as a carrier, and the carrier is combined with the molybdenum disulfide nanosheet with excellent adsorption selectivity on lead ions by utilizing the mediation effect of polydopamine, so that the solid-liquid separation of the molybdenum disulfide powder is realized. And the usability of the molybdenum disulfide nano material is improved. The material is high in adsorption capacity for lead ions in water, rapid in adsorption reaction kinetics and capable of being stably used in a fixed bed flowing system, the material saturated in adsorption can be desorbed and regenerated, the purpose of repeated use is achieved, and the material has a wide application prospect in advanced treatment of lead-containing wastewater.

Description

technical field [0001] The invention belongs to the fields of advanced treatment of drinking water and industrial waste water and preparation of novel composite adsorption materials, and in particular relates to a molybdenum disulfide activated carbon fiber composite adsorbent for deep purification of lead-containing waste water and a preparation method thereof. Background technique [0002] With the rapid development of my country's metallurgy, chemical industry, paint printing, electroplating and other industries in recent years, a large amount of wastewater containing heavy metal compounds has been discharged into natural waters, which has greatly endangered ecological security and the health of the people. Among them, lead, as one of the most toxic and harmful heavy metals, is difficult to degrade in the natural environment, and has bioaccumulation, and can accumulate through the food chain in the natural environment. How to efficiently purify lead-containing wastewater ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/0285B01J20/0218B01J20/262C02F1/281C02F1/283C02F1/285B01J2220/4812B01J2220/4806B01J2220/46C02F2101/20C02F2303/16
Inventor 聂广泽王翔仇世俊张欢
Owner NANJING UNIV OF TECH
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