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Heavy metal adsorbent, preparation method and application thereof

A technology for adsorbents and heavy metals, applied in the direction of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of waste of resources, easy reunion of waste MTP catalysts, etc., to improve reactivity, improve separation and recovery performance , to achieve the effect of efficient processing

Inactive Publication Date: 2020-06-26
CHINA ENERGY GRP NINGXIA COAL IND CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a heavy metal adsorbent and its preparation method and application in order to overcome the problem that nano-zero-valent iron is easy to agglomerate and waste MTP catalyst resources in the prior art. The heavy metal adsorption improves the reaction of nano-zero-valent iron activity, improving the separation and recovery performance of nano-zero-valent iron, and broadening the resource utilization of waste MTP catalysts

Method used

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  • Heavy metal adsorbent, preparation method and application thereof
  • Heavy metal adsorbent, preparation method and application thereof

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preparation example Construction

[0035] A second aspect of the present invention provides a method for preparing a heavy metal adsorbent, the method comprising:

[0036] (1) Mix waste MTP catalyst, ethanol solution and iron salt to obtain a mixed solution;

[0037] (2) Reducing the mixed solution to obtain a heavy metal adsorbent.

[0038] In the present invention, the above-mentioned limitations are used for the spent MTP catalyst, and details are not repeated here.

[0039] According to the present invention, preferably, the method further includes: before mixing, roasting the spent MTP catalyst, so as to improve the strength and stability of the spent MTP catalyst.

[0040] Preferably, the calcination conditions include: the temperature is 350-700°C, preferably 450-600°C, and the time is 1-15h, preferably 3-10h. Optimum calcination conditions are more conducive to improving the strength and thermal stability of the spent MTP catalyst.

[0041] In the present invention, unless otherwise specified, the et...

Embodiment approach

[0058] According to a preferred embodiment of the present invention, the heavy metal adsorbent is first washed with absolute ethanol for 3-5 times, then rinsed with oxygen-free deionized water for 3-5 times, filtered with suction, and dried in a vacuum drying oven, and then Keep airtight.

[0059] The third aspect of the present invention provides a heavy metal adsorbent prepared by the above method.

[0060] The fourth aspect of the present invention provides an application of the heavy metal adsorbent mentioned above in the adsorption of heavy metal ions in wastewater.

[0061] In the present invention, the heavy metal ion has a wide selection range, preferably, the heavy metal ion is selected from Pb 2+ 、Cu 2+ 、Cd 2+ and Cr 6+ at least one of the

[0062] According to the present invention, preferably, the concentration of heavy metal ions in the waste water is independently 100-1500 mg / L, more preferably 100-500 mg / L. For example, the wastewater described in the test...

Embodiment 1

[0073] (1) Take the 5-40 mesh sieve sample after crushing the waste MTP catalyst (reference example C1) with ZSM-5 molecular sieve as the main body collected by the 500,000 tons of MTP industrial device of Ningmei Coal Company of Guoneng Group, and put it in the muffle furnace Calcined at 550°C for 4h, in a nitrogen atmosphere, 10g of the calcined spent catalyst was mixed with 100mL of 70% ethanol solution, 1.5g of FeSO 4 ·7H 2 O was stirred at 25° C. for 30 min in water to obtain a mixed solution;

[0074] (2) Continuing to pass nitrogen gas, 150mL of 0.1mol / L NaBH 4 The solution is added dropwise into the mixed solution at a rate of 3 drops / second for reaction, wherein the temperature is 50°C and the time is 200 minutes;

[0075] (3) After the solid-liquid separation of the product in step (2), wash 3 times with absolute ethanol, then rinse 3 times with anaerobic deionized water, filter with suction, dry in a vacuum drying oven at 80°C for 24 hours, seal and store, to obta...

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Abstract

The invention relates to the field of resource utilization of waste molecular sieve catalysts, and discloses a heavy metal adsorbent, a preparation method and application thereof. According to the adsorbent, a waste MTP catalyst is used as a carrier to load nano zero-valent iron particles, and is a molecular sieve catalyst. The preparation method of the heavy metal adsorbent comprises the following steps: (1) mixing a waste MTP catalyst, an ethanol solution and an iron salt to obtain a mixed solution; and (2) reducing the mixed solution to obtain the heavy metal adsorbent. According to the heavy metal adsorbent provided by the invention, the reaction activity of nano zero-valent iron is improved, the separation and recovery performance of the nano zero-valent iron is improved, the resourceutilization way of the waste MTP catalyst is broadened, and the heavy metal adsorbent provided by the invention can be used for effectively removing heavy metal ions in wastewater.

Description

technical field [0001] The invention relates to the field of resource utilization of waste molecular sieve catalysts, in particular to a heavy metal adsorbent and its preparation method and application. Background technique [0002] The spent MTP catalyst maintains ZSM-5 or SAPO-34 molecular sieve crystal form, porous structure, high specific surface area, has a certain acidity, is mainly composed of silicon aluminum oxygen or silicon aluminum phosphorus oxygen elements, and contains a small amount of carbon, sodium and potassium And iron elements, no heavy metals. [0003] After a long-term reaction and high-temperature charcoal regeneration process, the spent catalyst is relatively strong as a whole. In addition to insufficient crystallinity, the negatively charged structure retained on the surface makes it less affinity for anion adsorption, and the lattice aluminum element is lost more, acidity and freshness. The catalyst is relatively weak and the ion exchange capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/186B01J20/0229B01J20/28004C02F1/281C02F2101/20
Inventor 雍晓静李瑞龙姚敏张伟关翀张昊金政伟张安贵
Owner CHINA ENERGY GRP NINGXIA COAL IND CO LTD
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