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Preparation method and application of iron oxyhydroxide modified vermiculite composite adsorbing material for removing Mn from underground water

A composite adsorption material, iron oxyhydroxide technology, applied in chemical instruments and methods, contaminated groundwater/leachate treatment, adsorption water/sewage treatment, etc., can solve the problem of manganese content in groundwater exceeding the standard treatment function, rural drinking water is difficult to obtain safety Guarantee and other issues, to achieve the effect of no secondary pollution, high-efficiency adsorption performance, and broad application prospects

Active Publication Date: 2020-06-12
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the small household water purifiers on the market do not have the treatment function for manganese content exceeding the standard in groundwater.
Therefore, when the manganese content in groundwater exceeds the standard, it will be difficult to guarantee the safety of rural drinking water in these places

Method used

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  • Preparation method and application of iron oxyhydroxide modified vermiculite composite adsorbing material for removing Mn from underground water
  • Preparation method and application of iron oxyhydroxide modified vermiculite composite adsorbing material for removing Mn from underground water
  • Preparation method and application of iron oxyhydroxide modified vermiculite composite adsorbing material for removing Mn from underground water

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preparation example Construction

[0042] In order to make the preparation method and application of the present invention easy to understand, the present invention will be further described below in conjunction with specific examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0043] In this embodiment, the adsorption removal rate of the adsorbent to Mn(II) is calculated by the following formula:

[0044] (Initial Mn(II) concentration - Residual Mn(II) concentration after reaction)*100% / Initial Mn(II) concentration

[0045] The adsorption capacity of the adsorbent to Mn(II) is calculated according to the following formula:

[0046] (Initial Mn(II) concentration-residual Mn(II) concentration after reaction)*solution volume / adsorbent dosage

Embodiment 1

[0048] In this example, the preparation method of iron oxyhydroxide modified vermiculite composite adsorption material is as follows:

[0049] Step 1: Take 10g of natural vermiculite, wash it with deionized water for 10-15 times, then add it to 200ml0.01mol / L dilute hydrochloric acid solution, stir and react for 2h, and wash the vermiculite after pickling with deionized water until The lotion is near-neutral (PH value is 6.5-7.5), put it into a thermostat at 105°C and dry to constant weight, pass through 40-mesh and 60-mesh sieves to obtain pretreated vermiculite with a particle size of 40-60 mesh;

[0050] Step 2: mix the vermiculite of 6g pretreatment with 200ml 0.25mol / L Fe(NO 3 ) 3 The solution was stirred and mixed, impregnated and shaken with 400W ultrasonic wave at room temperature for 30 minutes, then adjusted to pH 12 with alkaline solution, stirred and reacted for 60 minutes, aged in a constant temperature oven at 60°C for 48 hours, cooled, filtered and separated to...

Embodiment 2

[0059] The preparation method of the ferric oxyhydroxide modified vermiculite adsorption material is the same as Step 1 and Step 2 of Example 1.

[0060] Step 3: Weigh 0.1000g (±0.0005g) of the above-mentioned obtained composite adsorption material and unmodified vermiculite, put them into a 250ml Erlenmeyer flask with a stopper respectively, and add 100mL Mn(II) with an initial concentration of 3mg / L thereinto ) water sample, placed in a constant temperature oscillator, fully oscillated (150r / min) at a temperature of 25°C, and stopped oscillating after absorbing for 180min;

[0061] Step 4: Take the supernatant after shaking in step 3 and pass it through a 0.45 μm microporous membrane, and measure the remaining Mn(II) concentration in the filtrate with a Shimadzu AA-7000 atomic absorption spectrophotometer. The results show that: for the water sample with an initial concentration of 3mg / L Mn(II), the adsorption capacity of vermiculite for adsorbing Mn(II) is 1.80mg / g, while t...

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Abstract

The invention relates to a preparation method and an application of an iron oxyhydroxide modified vermiculite composite adsorbing material for removing Mn from underground water. The preparation method comprises the following steps: washing vermiculite with water for many times, carrying out acid treatment, carrying out solid-liquid separation, washing the vermiculite subjected to acid treatment with water until the washing waste liquid is neutral, and drying the obtained vermiculite for later use; placing the vermiculite in a water-soluble ferric iron salt solution, and performing ultrasonicoscillation for 30-60 min to obtain a mixed solution; dropwise adding an alkali liquor into the mixed solution while stirring until the pH value of the mixed solution is 10-12, then continuing to stirfor 30-120 min, and then carrying out constant-temperature aging, cooling and solid-liquid separation to obtain an initial product of the composite adsorbing material; and washing, drying and coolingthe initial product of the composite adsorbing material to obtain the iron oxyhydroxide modified vermiculite composite adsorbing material. The composite adsorbing material is good in stability and easy to recover, can simultaneously exert the activity of iron oxyhydroxide for enhancing catalytic adsorption of manganese ions and the excellent adsorption performance of vermiculite, and has higher adsorption capacity than single vermiculite, and the Mn adsorption capacity at low concentration is 2.94 mg / g.

Description

technical field [0001] The present invention relates to a preparation method and application of an iron oxyhydroxide modified vermiculite composite adsorption material, in particular to an iron oxyhydroxide modified vermiculite composite adsorption material for adsorbing and removing Mn(II) in manganese-containing groundwater The preparation method and application thereof belong to the field of drinking water treatment. Background technique [0002] my country has abundant groundwater resources, but in many areas, due to hydrogeological and other reasons, the manganese content in groundwater sources exceeds the standard, which is called manganese-containing groundwater. Long-term drinking of groundwater with excessive manganese content is likely to lead to chronic poisoning, loss of appetite, vomiting, diarrhea, gastrointestinal disorders, abnormal stool, and even tremor paralysis, which seriously endangers the human nervous system and damages the inner wall of arteries and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12C02F1/28B01J20/30C02F101/20C02F103/06
CPCB01J20/06B01J20/12C02F1/281C02F2101/206C02F2103/06
Inventor 吴慧英粘雅馨黄博凡
Owner HUNAN UNIV
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