Preparation method of multivalent nanometer manganese oxide for effectively removing organic pollutants in water

A technology for removing organic pollutants and water, used in biochemical equipment and methods, water pollutants, microorganism-based methods, etc., and can solve problems such as environmental hazards

Inactive Publication Date: 2014-11-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Extensive use of such pollutants wil

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  • Preparation method of multivalent nanometer manganese oxide for effectively removing organic pollutants in water
  • Preparation method of multivalent nanometer manganese oxide for effectively removing organic pollutants in water
  • Preparation method of multivalent nanometer manganese oxide for effectively removing organic pollutants in water

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specific Embodiment approach 1

[0015] Specific embodiment 1: Preparation of multivalent nano-manganese oxide

[0016] With yeast extract, acid hydrolyzed casein, glucose, HEPES, CaCl 2 , MgSO 4 , FeCl 3 And trace elements (CuSO 4 , ZnSO 4 , CoCl 2 , NaMoO 4 ) Make the culture medium, adjust the pH to 6-8 with 3 M NaOH, inoculate the manganese oxidizing bacteria Pseudomonas sp. G7 at 1% (V / V) after autoclaving at 20-30 o C incubate in a constant temperature incubator with shaking for 20-30 h, and then add 0.3-0.5 mM filter-sterilized MnCl 2 Aqueous solution, continue to shake for 12-15 d, and the obtained precipitate is washed with deionized water to obtain the multivalent catalyst.

[0017] figure 1 The XPS spectrum of the prepared nano-manganese oxide is given. It can be seen from the figure that Mn 2p 3 / 2 The resulting XPS narrow peaks can be well fitted to Mn 2+ (640.9 eV), Mn 3+ (641.8 eV) and Mn 4+ (642.4 eV) three peaks, confirming that manganese in the catalyst exists in a multivalent form.

specific Embodiment approach 2

[0018] Specific embodiment two: oxidation removal of 2-chlorophenol in water by multivalent nano-manganese oxide

[0019] 2-chlorophenol is used as a target pollutant to evaluate the catalytic oxidation activity of the multivalent nano-manganese oxide of the present invention. The reaction conditions are as follows: the concentration of 2-chlorophenol is 20 mg L -1 , The dosage of manganese oxide is 50 mg Mn L -1 , The reaction system pH=7, the whole reaction process is always under stirring. The concentration change during the degradation of 2-chlorophenol was analyzed by high performance liquid chromatography, and the intermediate product was measured by ion chromatography. The Mn released during the reaction 2+ The concentration is detected by inductively coupled plasma emission spectroscopy, see the specific results figure 2 with image 3 .

[0020] by figure 2 It can be seen that only 30% of 2-chlorophenol was removed in the Pseudomonas sp. G7 manganese oxidizing bacteria s...

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Abstract

The invention relates to a preparation method of a multivalent nanometer manganese oxide for effectively removing organic pollutants in water. The method comprises the following steps: preparing a medium by using yeast extract powder, acid hydrolyzed casein, glucose, HEPES, CaCl2, MgSO4, FeCl3 and trace elements (CuSO4, ZnSO4, CoCl2 and NaMoO4), adjusting the pH value to 6-8 by using 3M of NaOH, carrying out high temperature and high pressure disinfection, inoculating Pseudomonas sp.G7 according to 1%(V/V), carrying out shaking culture in a 20-30DEG C constant temperature culturing box for 20-30h, adding 0.3-0.5mM of a filtered and disinfected aqueous solution of MnCl2, continuously shaking for 12-15d, and washing the obtained precipitate with deionized water to obtain the multivalent nanometer manganese oxide. The above material has very good catalytic activity and stability, 2-chlorophenol converts to formic acid, acetic acid, oxalic acid and other micro-molecular organic acids in the degradation process, and the generation of a superoxide radical by the multivalent activated molecule oxygen of manganese is the main reason causing efficient degradation.

Description

Technical field [0001] The invention relates to a preparation method of multivalent nano-manganese oxide, in particular to the study of a new type of nano-manganese oxide for removing 2-chlorophenol from organic pollutants in water. technical background [0002] Chlorophenolic compounds are the most widely used, toxic and polluting compounds among aromatic compounds. They are mainly used for wood preservation, metal rust prevention, pesticides, herbicides, and the prevention and treatment of schistosomiasis. The extensive use of such pollutants will cause great harm to the environment. The US EPA and China Environmental Monitoring Center have listed many chlorophenol compounds as priority pollutants. Therefore, the development of an effective technical method for the treatment of chlorophenol compounds has been widely concerned. [0003] As a common mineral component, manganese oxide is ubiquitous in soil and water sediments. Compared with other soil minerals (iron oxide, aluminum...

Claims

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Application Information

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IPC IPC(8): C12P3/00C02F1/72C12R1/38C02F101/36
Inventor 胡春屠锦军
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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