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A heavy metal mesoporous adsorption material based on molybdenum ore tailings as raw material and its preparation method and application

An adsorption material and heavy metal technology, which is applied in the field of environmental heavy metal pollution treatment, can solve problems such as land occupation, waste of resources, and environmental pollution risks, and achieve the effects of improving quality, good adsorption effect, and simple preparation process

Active Publication Date: 2019-05-07
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, tailings resources are continuously accumulating every year, and a large amount of tailings sand is accumulated in the tailings pond, which not only occupies land, wastes resources, but also poses environmental risks of pollution

Method used

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  • A heavy metal mesoporous adsorption material based on molybdenum ore tailings as raw material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Preparation of heavy metal mesoporous adsorption material based on molybdenum ore tailings as raw material

[0043] (1) Take 15g of molybdenum ore tailings and grind through a 200 mesh sieve, add 30ml, 1mol / L H 2 SO 4 Vibrate in a shaker, filter and separate, and dry; divide into crucibles, add an equal mass of NaOH to each crucible, and heat them together in a muffle furnace at 823K. After 3 hours, take them out to cool naturally, and grind them for use.

[0044] (2) Take 5g of the product that was ground in step (1) and add 90ml of deionized water to dissolve it, centrifugally filter the supernatant, transfer it to a teflon tank, and add 5.4g of sodium metaaluminate and 15.75g of water glass to adjust the material Ratio, magnetically stirred at 343K for 1h.

[0045] (3) Transfer the stirred reaction materials in the teflon tank to the reactor, and react at 373K. After 8 hours of reaction, take it out and cool to room temperature, filter, wash, and dry to ...

Embodiment 2

[0047] at 0.05mol L -1NaCl solution was used as the supporting electrolyte solution, and the concentration of Cd solution was prepared to be 100mg L -1 solution of heavy metal ions. Measure 25mL of the metal ion solution with the above concentration, add it into a 50mL centrifuge tube filled with 0.1g of the heavy metal adsorption material prepared in Example 1, repeat each treatment 3 times, and take the average value. Cover the centrifuge tube with the sample added, and set the temperature at 250r·min -1 , (25±2)°C, shake for 24h, then rotate at 6000r·min -1 Centrifuge for 30 min, filter, and measure the concentration of Cd ions in the equilibrium solution by atomic absorption spectrophotometry (AAS).

[0048] The results of the adsorption material made with sodium hydroxide showed that the Cd concentration of the supernatant after the equilibrium measurement was 0.25mg L -1 , that is, the processing rate can reach 99.76%.

Embodiment 3

[0050] at 0.05mol L -1 NaCl solution is used as the supporting electrolyte solution, and the metal ion solutions of the following concentrations are prepared respectively, and the concentration of Cd solution: 20, 30, 60, 100, 140, 190, 280, 420mg L -1 Measure the metal ion solution of 25mL above-mentioned concentration, add in the 50mL centrifuge tube that fills the heavy metal adsorption material that 0.1g embodiment 1 prepares, each treatment repeats 3 times, gets the average value. Cover the centrifuge tube with the sample added, and set the temperature at 250r·min -1 , (25±2)°C, shake for 24h, then rotate at 6000r·min -1 Centrifuge for 30 min, filter, and measure the concentration of Cd ions in the solution after equilibrium with atomic absorption spectrophotometry (AAS), so as to obtain the removal rate.

[0051] The heavy metal adsorption material prepared in embodiment 1 is to the removal rate figure of Cd in the Cd-containing solution under different concentrations:...

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Abstract

The invention belongs to the technical field of heavy metal pollution treatment for environment and discloses a heavy metal mesoporous adsorbent material with molybdenum ore tailings as raw material as well as a preparation method and an application thereof. The preparation method comprises steps as follows: an alkaline sodium compound is added after molybdenum ore tailings are subjected to acid pickling, the mixture is heated in a muffle furnace and dissolved in water, sodium metaaluminate and water glass are added to a supernatant, the mixture is uniformly mixed and transferred to a reactor to react, an obtained reaction liquid is purified after the reaction ends, and the heavy metal mesoporous adsorbent material is obtained. The mesoporous adsorbent material prepared with the method has a very good adsorption effect on heavy metals, has the removal rate of 95% or above even under the condition that the concentration of heavy metal solutions is up to 420 mg*L<-1>, is stable at adsorption, has no secondary pollution risk and can be applied to heavy metal wastewater treatment. Besides, the characteristics of the raw material, namely, molybdenum ore tailing waste, is fully utilized, waste is treated by waste while the product quality is improved, the preparation process is simple, and industrial production promotion is facilitated.

Description

technical field [0001] The invention belongs to the technical field of environmental heavy metal pollution treatment, and in particular relates to a heavy metal mesoporous adsorption material based on molybdenum ore tailings as a raw material, its preparation method and application. Background technique [0002] With the increasing scarcity of water resources, human beings' thirst for water resources is becoming stronger and stronger, but the problem of water pollution is becoming more and more serious, which leads to less available water resources. Therefore, the problem of dealing with polluted wastewater has become a worldwide problem. Especially in developing countries, the environmental problem of massive discharge of polluted waste water has even become an obstacle to the progress and development of the country. Heavy metal pollution has the characteristics of toxicity, non-biodegradability and accumulation, and exists in the water environment, which seriously threate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10C02F1/28B01J20/30C02F101/20
CPCB01J20/041B01J20/08B01J20/103C02F1/281C02F2101/20
Inventor 胡峥王进进李永涛张振张玉龙
Owner SOUTH CHINA AGRI UNIV
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