Method for removing semimetal antimony ion from waste water

A semi-metal and wastewater technology, applied in the field of water treatment, can solve the problems of low effective utilization rate of electrode materials, low removal rate of heavy metal ions, removal, and low recovery rate, etc., to achieve improved effective utilization rate, short treatment time, and environmental protection good sex effect

Inactive Publication Date: 2008-05-28
SUZHOU UNIV
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  • Abstract
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Problems solved by technology

Its micro-electrolysis pretreatment improves the shortcomings of the pure chemical precipitation method, such as low remo

Method used

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  • Method for removing semimetal antimony ion from waste water
  • Method for removing semimetal antimony ion from waste water
  • Method for removing semimetal antimony ion from waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0020] In this embodiment, a batch reactor is used to electrolyze the waste water solution, see accompanying drawing 1, in which: 1 is the working electrode, 2 is the opposite pole (platinum wire), 3 is the anode area, and 4 is the rotor. In this embodiment, a DC power electrolyzer (PAK60-12A, Kikusui Co., Ltd) with a two-electrode system (the counter electrode is a platinum wire) and a three-electrode system (the working electrode is a titanium mesh, the reference electrode is Ag / AgCl, and the counter electrode is Ag / AgCl) are respectively used. Platinum wire) electrolyzer (Potentiostat / Galvanostat HAB-151, Hokuto Denko Co., Ltd).

[0021] Adjust the wastewater solution containing semimetallic antimony ions to a concentration of 0.2mol L with sulfuric acid -1 , in a batch reactor with an effective capacity of 100mL, a titanium mesh (5×10cm) was used as the working electrode, and the conditions used were: -0.02A constant electrolysis current, electrodeposition time of 10min, r...

Embodiment 2

[0038] In this embodiment, a continuous flow reactor and a three-electrode system are used, and the schematic diagram of the reactor is shown in Figure 2.

[0039] In the figure, 1 is the working electrode, 2 is the counter electrode (platinum wire), 3 is the anode area, 4 is the rotor, and 17 is the reference electrode (Ag / AgCl). In this example, the titanium mesh (5×10cm) was used as the working electrode, and the sample provided in Example 1 was treated by constant current electrolysis, and the flow rate was 3.4-5mL min -1 , the specific steps and other conditions are as described in Example 1.

[0040] Table 2 shows the experimental test results obtained by removing semimetal antimony from the four samples provided in Example 1 using the device and process conditions described in this example.

[0041] Table 2

[0042]

sample

Antimony content

(mg L -1 )

Removal rate

(%)

residual amount ...

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Abstract

The invention discloses an electrochemical deposition method which is used for eliminating semimetal antimony ions from waste water. By adopting a three-electrode or two-electrode system and using a titanium mesh as working electrode, semimetal antimony ions in the solution are precipitated in the form of semimetals or the oxide thereof in the working electrode by constant current electrochemical reduction deposition, so as to effectively eliminate the toxic antimony ions from the waste water with weak acid and low content, etc.; meanwhile, the electrodeposition of trivalent, quintavalent and total antimony can be realized through the adjustment of the acidity of mediums. The titanium which is inert to the reduction of hydrogen ion is adopted as the electrode material, thus improving the effective utilization of the electrode; meanwhile the abundant electrons in the titanium electrode which is a green chemical reagent leading the semimetal antimony ions in the solution to be precipitated after being reduced to solid by one-step method is utilized, therefore the treatment technology without second pollution is clean and has good environmental protection property. Furthermore, the invention has the advantages of simple technology, short process and high efficiency.

Description

technical field [0001] The invention relates to a method for removing toxic metals, semimetal ions and their compounds in aqueous solution, in particular to a method for treating wastewater containing semimetal ions, and belongs to the technical field of water treatment. Background technique [0002] Antimony is a natural semi-metallic element. Under the action of nature (such as rock weathering, soil erosion), and due to human production activities, antimony is widely distributed and exists in the natural environment. At present, the storage capacity of antimony in the world exceeds 200 million tons, and it is distributed in many countries. The annual output of antimony in the world is about 140,000 tons, which is widely used in the metallurgical industry, the production of reinforced materials, the flame-retardant finishing of textiles, the production of ceramics, semiconductors, batteries, cables, etc., and even in industrial fields such as medicine [Antimony in the envir...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/461
Inventor 龙家杰陆同庆唐人成永长幸雄
Owner SUZHOU UNIV
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