Attapulgite-based composite heavy metal adsorbent and preparation method thereof

A technology of attapulgite and heavy metals, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, and can solve the problems of high preparation cost of heavy metal ion adsorbents, easy damage to the ecological environment, and ineffective treatment effects , achieve the effect of low preparation cost, increase adsorption effect, and save enterprise operating cost

Pending Publication Date: 2022-07-12
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the physical and chemical remediation technology, the traditional method for treating heavy metals, is relatively expensive to remove heavy metal pollutants in the environment, and the operation and management are troublesome. The waste water treatment effect of compound is not obvious, it is easy to damage the ecological environment and cause secondary pollution
[0005] CN104907051A discloses a preparation method and application of a heavy metal ion adsorbent. In the method, aldehyde sodium alginate is made into an aqueous solution, polyethylene polyamine is added for reaction, and then sodium borohydride is added for reduction, and the reaction is continued to obtain amino sodium alginate And add the mixed solution of carbon disulfide and sodium hydroxide to finally obtain the heavy metal ion adsorbent, but the heavy metal ion adsorbent has high preparation cost and is difficult to use on a large scale; CN111790349A discloses a preparation method and application of the adsorbent for adsorbing heavy metal ions , using clay with a layered structure as a raw material, through alkali metal ion intercalation, liquid phase exfoliation, and centrifugal sieving to obtain a dispersion with two-dimensional nanosheets as a solute, which is used for heavy metal ions (nickel, cobalt, cadmium) in sewage adsorption, but the method steps are cumbersome, and it is easy to lose stability in water with too high or too low pH

Method used

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  • Attapulgite-based composite heavy metal adsorbent and preparation method thereof

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Embodiment 1

[0030] A method for preparing a composite heavy metal adsorbent based on attapulgite, comprising the following steps: calcining the attapulgite and pulverizing the attapulgite to obtain attapulgite powder; placing the dried leaves in a tube furnace, The nitrogen atmosphere was turned on, and the nitrogen inflow rate was 25 mL / min. The temperature of the carbonization is 300-350°C. After the carbonization is completed, the tube furnace is cooled to room temperature and taken out to obtain the biochar; the biochar is immersed in a 1 mol / L citric acid solution, After ultrasonic treatment, biochar activated by citric acid is obtained; the mass-volume ratio of biochar to citric acid is 1g:60mL (W:V), and the ultrasonic treatment is interval ultrasonic, specifically ultrasonic treatment 3 to 5 times, each time Ultrasonic treatment was performed for 1 to 3 hours, with an interval of 2 to 4 hours after ultrasonic treatment.

[0031] Mix attapulgite powder and citric acid-activated bi...

Embodiment 2

[0033] Adsorption experiments under different pH conditions:

[0034] Prepared separately with different pH and containing 50mg / L Cd 2+ , 50mg / L Cu 2+ , 50mg / L Pb 2+ 100 mL of simulated wastewater was put into each group of simulated wastewater, and 0.1 g of the composite heavy metal adsorbent prepared by the method in Example 1 was put into each group of simulated wastewater. After adsorption for 1-2 min, the Cd in the solution was measured. 2+ The adsorption rate under different pH conditions is shown in the following table:

[0035]

[0036] As can be seen from the above table, under different pH conditions, the adsorbent of the present invention has a strong effect on Cd 2+ , Cu 2+ , Pb 2+The adsorption rate of the samples reached more than 95%, and good adsorption effects were achieved under different pH conditions. The adsorbent particles of the invention show high stability to strong acids and alkalis, and have strong adsorption capacity for cadmium ions, coppe...

Embodiment 3

[0038] Adsorption experiments under different temperature hydrothermal reactions:

[0039] The composite heavy metal adsorbent was prepared by hydrothermal reaction at different temperatures, and other conditions were the same as in Example 1, and 0.1 g of the obtained adsorbent was put into 10 mg / L Cd 2+ 100mL of simulated wastewater (pH is 7), after adsorption for 1-2min, the Cd in the solution was determined 2+ The results are shown in the following table:

[0040]

[0041] It can be seen from the above table that the best adsorption effect was achieved when the hydrothermal reaction temperature was 160 °C.

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Abstract

The invention discloses a composite heavy metal adsorbent based on attapulgite and a preparation method thereof, and belongs to the technical field of heavy metal adsorbents. The method comprises the following steps: calcining attapulgite, and crushing to obtain attapulgite powder; preparing the dried leaves into biological carbon; biochar is soaked in a citric acid solution, and citric acid activated biochar is obtained after ultrasonic treatment; the preparation method comprises the following steps: mixing attapulgite powder with biochar activated by citric acid, carrying out a hydrothermal reaction to obtain an attapulgite/carbon composite material, dispersing the attapulgite/carbon composite material in an organic solvent, carrying out ultrasonic dispersion, dropwise adding a silane coupling agent, after the reaction is finished, removing the solvent, carrying out vacuum drying, grinding and sieving to obtain silane coupling agent modified attapulgite; washing, filtering and drying to obtain the composite heavy metal adsorbent. The adsorbent disclosed by the invention has very high stability under strong acid and strong alkali conditions, and has an excellent heavy metal ion adsorption effect.

Description

technical field [0001] The invention belongs to the technical field of heavy metal adsorbents, in particular to a composite heavy metal adsorbent based on attapulgite and a preparation method thereof. Background technique [0002] Industrial development has caused a series of environmental problems. Among them, heavy metal pollution is more common in water and soil. Due to the special properties of heavy metal ions, heavy metal ions cannot be biodegraded under natural conditions, but will only accumulate in the environment. Through the enrichment of plants, they accumulate in the human body through the food chain. Heavy metal ions are toxic, bioaccumulative and non-degradable. Excessive accumulation in the human body can cause various diseases. [0003] When the intake of heavy metals in the human body exceeds the standard, it will seriously affect people's health, especially the physical development, nervous system and hematopoietic system of children and children. At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/12B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/12B01J20/3078B01J20/3085C02F1/281C02F1/283B01J2220/4825C02F2101/20Y02W10/37
Inventor 胡涛何磊张静吴彩金李东黄晓超赵小娟袁君
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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