A kind of method utilizing oxalic acid and siderophore dfob to dissolve hematite
A technology of siderophores and hematite, which is applied in the field of using oxalic acid and siderophores DFOB to promote the dissolution of hematite, can solve the problems of limited contribution of iron dissolution rate of iron-containing minerals, and achieve the goal of increasing iron dissolution rate and dissolution amount Effect
Active Publication Date: 2021-04-27
SUN YAT SEN UNIV
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Problems solved by technology
However, due to the limitations of siderophores and small molecule organic acids and environmental factors (such as pH in the soil), siderophores and small molecule organic acids cannot fully play the role of providing iron nutrition for organisms, which is mainly manifested in the single-dose application of the two. limited contribution to the iron dissolution rate of iron-bearing minerals
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[0028] The present invention is illustrated below by Examples and Comparative Examples.
[0029] See Table 1 for the concentrations of carrier DFOB, oxalic acid, citric acid and malic acid and the concentration of hematite suspension in Examples and Comparative Examples.
[0030] 1. Method:
[0031] The hematite dissolution experiment was carried out in a shaking table protected from light at a temperature of 30° C. and a rotation speed of 160 rpm. The reaction vessel was a batch of 100 ml high-density polyethylene centrifuge tubes. 0.01M NaClO in each centrifuge tube 4 As the background electrolyte solution, 0.005MMES (pH range 5.5-6.7) is used as a buffer to adjust the pH value of the solution, and the concentration of hematite suspension is 2.0g L -1 . The pH of the reaction solution was adjusted to 3±0.1, 5.5±0.1, 9±0.1 with 0.1M HCl or 0.1M NaOH. In different treatments, the reaction initial concentrations of siderophore DFOB, oxalic acid, citric acid and malic acid a...
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Abstract
The invention discloses a method for dissolving hematite by using oxalic acid and iron carrier DFOB, which is characterized in that the iron carrier DFOB and oxalic acid are added to the background electrolyte solution to form the liquid phase of the reaction system, wherein the molar concentration ratio of the iron carrier DFOB and oxalic acid is 1 :1, add hematite to its concentration of 2.0g L ‑1 , adjust the pH of the reaction system to 3-9, and shake the reaction at 30°C for 120-240h under the dark condition. The present invention adopts iron carrier DFOB and oxalic acid to synergistically dissolve hematite under the condition of avoiding light and pH 3-9, which can greatly increase the iron dissolution rate of hematite and increase the dissolution amount of iron.
Description
technical field [0001] The invention relates to a method for dissolving hematite, in particular to a method for promoting the dissolution of hematite by utilizing oxalic acid and iron carrier DFOB. Background technique [0002] Iron is an essential element for the normal growth and development of organisms. The iron concentrations required for normal growth of microorganisms and plants are 10 -5 ~10 -7 M and 10 -4 ~10 -9 M. However, in the aerobic plant rhizosphere environment, iron mainly exists in the form of Fe3+ in insoluble iron-containing minerals (Table 1), such as ferrihydrite, goethite and hematite, which are difficult to be utilized by organisms. To achieve the concentration of iron required for normal growth of organisms, the pH of the soil needs to drop to about 3, and at this pH, organisms can hardly survive. Studies have found that organisms have acquired iron mechanisms in the long-term evolution process, such as siderophore secreted by microorganisms an...
Claims
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IPC IPC(8): C05D9/02
CPCC05D9/02
Inventor 王诗忠林庆祺王英丽仇荣亮汤叶涛晁元卿
Owner SUN YAT SEN UNIV