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Heavy metal mercury adsorbent and preparation method thereof

A technology for adsorbents and heavy metals, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of inability to meet environmental water quality standards for polluted water bodies, low adsorption affinity, and poor adsorption selectivity. Achieve excellent acid and alkali resistance, high adsorption capacity, and high economic value

Inactive Publication Date: 2021-06-11
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional adsorption materials including zeolite, activated carbon, silica gel, clay, etc. have been unable to meet the increasingly complex polluted water environment and stricter water quality standards due to their low adsorption affinity, small adsorption capacity, and poor adsorption selectivity.

Method used

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  • Heavy metal mercury adsorbent and preparation method thereof
  • Heavy metal mercury adsorbent and preparation method thereof
  • Heavy metal mercury adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: Preparation of Zr-MSA nanoparticles

[0043] 23.3g ZrCl 4 Dissolve 15g of mercaptomalic acid (MSA) in 200mL of deionized water, and after ultrasonic treatment for 1 minute, add 13mL of formic acid; cover the bottle, and place the above solution in an oven at 80°C for 3h; wait to cool to room temperature Finally, the obtained white precipitate was centrifuged, washed 4 times with deionized water, and freeze-dried for 24 hours to obtain Zr-MSA nanoparticles.

Embodiment 2

[0044] Embodiment 2: Preparation of Zr-MSA / PVDF / DMF ternary mixed solution

[0045]Take 2 g of the Zr-MSA powder obtained in Example 1 and disperse it in 100 mL of DMF solvent. After stirring for 5 min, use a cell disruptor (1200 w) to sonicate the Zr-MSA particles for 15 min under ice bath conditions to make the Zr-MSA particles highly dispersed; heat and stir at 50 ° C Slowly add 2g of PVDF powder into the Zr-MSA / DMF mixed solution, and stir it magnetically for 2 hours to obtain a uniformly dispersed Zr-MSA / PVDF / DMF ternary mixed solution.

Embodiment 3

[0046] Embodiment 3: the preparation of heavy metal mercury adsorbent

[0047] Take the cut melamine sponge (1.5×1.5×5cm 3 ) impregnated in the Zr-MSA / PVDF / DMF ternary mixed solution of embodiment 2 gained, take out sponge after repeatedly extruding 5 times and drain the dispersion liquid of surface adhesion; In the process, the temperature was raised to 150 °C and kept for 3 hours, and the oven was cooled to room temperature, and the heavy metal mercury adsorbent Zr-MSA / PVDF@MS with high stability was obtained. After testing, the loading of Zr-MSA nanoparticles in the heavy metal mercury adsorbent is about 37.0wt%.

[0048] figure 1 It is the photogram of the heavy metal mercury sorbent prepared by embodiment 3, and the appearance of the heavy metal mercury sorbent prepared by the above-mentioned method is pale yellow.

[0049] figure 2 It is the SEM figure of the heavy metal mercury sorbent prepared in embodiment 3, Zr-MSA nanoparticles are evenly distributed on the hea...

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Abstract

The invention discloses a heavy metal mercury (Hg) adsorbent and a preparation method thereof, and belongs to the technical field of heavy metal wastewater treatment. The heavy metal mercury adsorbent is characterized in that porous melamine sponge is used as a carrier material, a net film is formed by means of the thermally induced phase separation characteristic of PVDF, and due to the strong hydrogen-bond interaction between PVDF and Zr-MSA nano-particles, Zr-MSA nanoparticles are stably fixed on fiber bundles in the porous melamine sponge by the PVDF net film, so that the problems that Zr-MSA powder is easy to agglomerate, difficult to separate and difficult to reuse are solved. The heavy metal mercury adsorbent prepared by the method has super-strong stability, excellent acid resistance, alkali resistance and organic solvent resistance, can be used as an efficient and stable heavy metal mercury adsorption material, has higher heavy metal Hg (II) adsorption capacity and higher adsorption kinetics rate, can remove heavy metal Hg (II) in a water solution from a complex water body in a targeted manner, and is excellent in reutilization performance.

Description

technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to a heavy metal mercury adsorbent and a preparation method thereof. Background technique [0002] Among many heavy metals, mercury (Hg(II)) has a wide transmission route, strong toxicity and bioaccumulation, and its environmental exposure will cause great harm to the ecological environment and human health. However, there are many types of mercury-containing wastewater, the water quality conditions are complex, the treatment process is complicated, and it is difficult to achieve deep removal. Therefore, the development of efficient mercury removal technology in water is of great significance to improve the efficiency of wastewater treatment, meet the advanced treatment needs of mercury-containing wastewater in key industries, and protect water quality safety and human health. [0003] Adsorption technology has long been used to control heavy me...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/0211B01J20/22B01J20/261B01J20/28011C02F1/288C02F2101/20
Inventor 罗金明付开星
Owner SHANGHAI JIAO TONG UNIV
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