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Method for preparing water body sexavalent molybdate adsorbent based on waste iron-aluminum mud of water plants

A technology of hexavalent molybdate and iron-aluminum mud is applied in the preparation of molybdate sewage treatment adsorbent materials, the use of solid waste adsorbent materials and the field of investigation of molybdenum removal effect, which can solve the problems of high operation cost, difficult operation, Secondary pollution and other problems, to achieve the effect of low price, expanded application scope and strong adsorption capacity

Inactive Publication Date: 2018-04-20
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of high operating cost, difficult operation, and secondary pollution in the existing technology for removing molybdate in water, the purpose of the present invention is to provide a hexavalent molybdate in water based on waste iron-aluminum mud from water supply plants The preparation method of the adsorbent, in order to realize the purpose that the adsorbent material is easy to obtain, the preparation process is simple, the operation cost is low, and the adsorption capacity of the molybdate is strong, and it also provides an effective way for the resource utilization of waste

Method used

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  • Method for preparing water body sexavalent molybdate adsorbent based on waste iron-aluminum mud of water plants
  • Method for preparing water body sexavalent molybdate adsorbent based on waste iron-aluminum mud of water plants
  • Method for preparing water body sexavalent molybdate adsorbent based on waste iron-aluminum mud of water plants

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Experimental program
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Effect test

Embodiment 1

[0034] Rinse the iron-aluminum slime in clean water for 1 day, then dry and grind naturally, and screen to obtain iron-aluminum slime with a particle size below 0.15mm; place it in a quartz crucible, put it in a muffle furnace, and pyrolyze it at 600°C 4h. After cooling, add it to 1.0g L at a solid-to-liquid ratio of 1:1 -1 In the fulvic acid solution, shake for 4~5h, the vibration speed is 200r min -1 , and then dried at 50°C for later use. Scanning electron microscope pictures of iron-aluminum mud before and after modification figure 1 , figure 2 It can be seen from the above two figures that the surface structure of the ferro-aluminum slime before modification is relatively dispersed, while the surface structure of the material after modification is denser, and the inner and outer layer voids are relatively reduced. The XRD pattern of the modified iron-aluminum mud is as follows image 3 As shown, it can be seen from the figure that the main crystalline substance of t...

Embodiment 2

[0036] Accurately weigh the 50mg example 1 sample in a centrifuge tube, and add a concentration of 50mg L -1 50mL of sodium molybdate solution, adjust the pH of the solution to 1-10 respectively, make 10 parallel samples, shake well and place at a speed of 150r min -1 Shake in a constant temperature shaker. After 12h, the sample was taken out, and the mixed solution was subjected to 8000r min -1 After centrifugation for 10 min, the concentration of molybdenum in the supernatant was determined by spectrophotometry. According to the difference between the initial solution and the concentration of Mo(VI) in the supernatant after centrifugation, the adsorption amount of the iron-aluminum slime to Mo(VI) was calculated, and the variation curve of the adsorption amount of the iron-aluminum slime to Mo(VI) with the pH of the solution was made ( Figure 4 ). It can be seen from the figure that acid-base conditions have a certain influence on the adsorption process, and the adsorpti...

Embodiment 3

[0038] Accurately weigh 50 mg of the sample of Example 1 in a centrifuge tube, and add a concentration gradient of 2 to 100 mg L -1 50mL of sodium molybdate solution, the pH of the solution is 2.3, after shaking well, place it at a speed of 150r min -1 Shake in a constant temperature shaker. After 12h, the sample was taken out, and the mixed solution was subjected to 8000r min -1 After centrifugation for 10 min, the concentration of Mo(VI) in the supernatant was measured by spectrophotometry. According to the difference between the concentration of Mo(VI) in the initial solution and the supernatant after centrifugation, the adsorption amount of Mo(VI) to the iron-aluminum slime was calculated, and the variation curve of the adsorption amount of the iron-aluminum slime to Mo(VI) with the concentration of molybdenum was made ( Figure 5 ). It can be seen from the figure that the amount of molybdenum adsorption tends to be stable with the increase of molybdenum concentration. ...

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Abstract

The invention discloses a method for preparing a water body sexavalent molybdate adsorbent based on waste iron-aluminum mud of water plants and belongs to the field of water body pollutant adsorptionmaterials. The method specifically comprises the following steps: (1) washing iron-aluminum mud in clean water, drying naturally, grinding, and screening; (2) putting the iron-aluminum mud into a quartz crucible, performing pyrolysis in a muffle furnace, and cooling and uniformly mixing in a drying tank for later use; and (3) putting the iron-aluminum mud of the step (2) into a 1.0 g L<-1> fulvicacid solution in a solid to liquid ratio of 1:1, oscillating for 4-5 hours, and drying for later use. After ground sewage of which the molybdate concentration is 5 mg <-1> is treated with the adsorption material, the content of molybdate in the water meets the IV class (less than or equal to 0.5 mg / L) of the underground water quality standards (GB / T 14848-9). The method has the characteristics ofbeing low in preparation cost, high in adsorption efficiency, wide in application, and the like, and resource utilization of wastes is achieved.

Description

technical field [0001] The invention belongs to the field of adsorption materials for water body pollutants, and in particular relates to the preparation of an adsorption material for molybdate sewage treatment, in particular to an adsorption material utilizing solid waste and the investigation of its molybdenum removal effect. Background technique [0002] Heavy metal sulfide minerals are the main source of heavy metals, and the heavy metals released by the weathering of tailings and waste rocks have become the main source of environmental pollution in mining areas. Under the action of rainfall leaching and scouring, heavy metals are transported from tailings to environmental units such as soil, groundwater, rivers and reservoirs, often causing serious environmental impacts on the watershed. The heavy metal molybdenum is one of the trace elements necessary for the survival of animals and plants, and it is also an important strategic resource in the development of the nation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/04B01J37/04B01J37/08C02F1/28C02F11/00C02F101/20
CPCB01J31/04B01J37/04B01J37/088C02F1/285C02F11/00C02F2101/20
Inventor 练建军陈波盛广宏刘宝河汪宁欣叶天然
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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