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Modified bentonite load nanometer iron material and preparation method thereof

A technology of bentonite and nano-iron, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of low utilization rate of zero-valent iron, increase the length of packed columns, etc., and achieve strong reduction Ability and adsorption capacity, the effect of strong adsorption capacity

Inactive Publication Date: 2013-12-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] American scholars Li, Z, etc. mixed zero-valent iron with natural zeolite, and then modified it with cetyltrimethylammonium bromide (Z. Li, J. H. Kirk, P. Zhang, et al.Chromate transport though columns packed with surfactant-modified zeolite / zero valent iron pellets[J].Chemosphere. 2007, 68: 1861-1866; Z. Li, J. H. Kirk, P. Zhang, et al. Migration of chromate in surfactant-modified zeolite / zero-valent iron packed column [J]. Chemosphere, 2007, 68: 1861-1866), changing the surface properties of zero-valent iron and zeolite , the modified zeolite / zero-valent iron packed column made accordingly can reduce and adsorb chromate, but the utilization rate of zero-valent iron is not high. Packed column length

Method used

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  • Modified bentonite load nanometer iron material and preparation method thereof
  • Modified bentonite load nanometer iron material and preparation method thereof
  • Modified bentonite load nanometer iron material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A modified bentonite loaded nano-iron material and a preparation method thereof. The concrete steps of its preparation method are:

[0034] Step 1. Stir bentonite and 0.05-0.1 mol / L divalent iron salt solution for 30-40 min at a stirring speed of 250-300 r / min to prepare a mixed solution of bentonite and divalent iron salt, in which the iron element The mass ratio to bentonite is 1: (1~2).

[0035] Step 2. Add the reducing agent solution dropwise to the mixed solution of bentonite and ferrous salt under the condition of continuous stirring in step 1,

[0036] The volume ratio of the ferrous salt solution to the reducing agent solution is 1: (0.95-1.05); after the reducing agent solution is added dropwise, continue stirring for 20-40 min to obtain a mixed solution containing bentonite-loaded nano-iron.

[0037] The reducing agent solution is prepared from a sodium hydroxide solution with a mass fraction of 0.2 wt% and a reducing agent, wherein the molar ratio of the re...

Embodiment 2

[0044] A modified bentonite loaded nano-iron material and a preparation method thereof.

[0045] This embodiment is except that ferrous salt is ferrous nitrate and reducing agent is zinc borohydride, all the other are the same as embodiment 1.

[0046] The modified bentonite-loaded nano-iron material prepared by this example is used to remove the heavy metal arsenic (Ⅴ) in the wastewater that exists in anion form at a concentration of 5 mg / L, and the dosage of the modified bentonite-loaded nano-iron material in every liter of wastewater is 1 g, the stirring speed was 250 r / min, room temperature, the pH of the wastewater was 6.0-6.2, and the contact time between the wastewater and the modified bentonite loaded nano-iron was 2 h. After detection and calculation, the removal rate of arsenic (V) in the wastewater is 98.6%.

Embodiment 3

[0048] A modified bentonite loaded nano-iron material and a preparation method thereof. The concrete steps of its preparation method are:

[0049] Step 1. Stir bentonite and 0.1-0.3mol / L ferrous salt solution for 30-40 min at a stirring speed of 250-300 r / min to prepare a mixed solution of bentonite and ferrous salt, in which the iron element The mass ratio to bentonite is 1: (1~2).

[0050] Step 2. Add the reducing agent solution dropwise to the mixed solution of bentonite and ferrous salt under the condition of continuous stirring in step 1,

[0051] The volume ratio of the ferrous salt solution to the reducing agent solution is 1: (0.95-1.05); after the reducing agent solution is added dropwise, continue stirring for 20-40 min to obtain a mixed solution containing bentonite-loaded nano-iron.

[0052] The reducing agent solution is prepared from a sodium hydroxide solution with a mass fraction of 0.2 wt% and a reducing agent, wherein the molar ratio of the reducing agent t...

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Abstract

The invention relates to a modified bentonite load nanometer iron material and a preparation method thereof. According to the technical scheme, the preparation method includes the steps of stirring bentonite and bivalent iron salt solutions to prepare the mixed liquor of the bentonite and the bivalent iron salt solutions, wherein the mass ratio between an iron element and the bentonite is 1: (1-2), then dropwise adding reducing agent solutions to the mixed liquor of the bentonite and the bivalent iron salt solutions and stirring to prepare mixed liquor containing bentonite load nanometer iron, and adding alkyl quaternary ammonium salt solutions into the mixed liquor containing the bentonite load nanometer iron and stirring, wherein the volume ratio between the mixed liquor containing the bentonite load nanometer iron and modifying agent solutions is 1: (0.15-0.20), and the steps are all carried out in a nitrogen environment; then carrying out suction filtration, drying and grinding the obtained solid in a vacuum environment to obtain the modified bentonite load nanometer iron material. The modified bentonite load nanometer iron material prepared by the preparation method has strong reducing capacity and adsorption capacity, and is suitable for removing heavy metal chromium (VI) and heavy metal arsenic (V), wherein the heavy metal chromium (VI) and the heavy metal arsenic (V) exist in water in an anionic form.

Description

technical field [0001] The invention relates to the technical field of a sewage treatment agent. In particular, it relates to a modified bentonite loaded nano-iron material and a preparation method thereof. Background technique [0002] Heavy metals chromium and arsenic, especially hexavalent chromium and pentavalent arsenic, mainly exist in the form of anions in surface water and groundwater, which are more harmful to human body. At present, the treatment methods of wastewater containing chromium and arsenic mainly include chemical precipitation, ion exchange and membrane separation. The chemical precipitation method is mainly to add calcium hydroxide to the wastewater, but if the dosage of calcium hydroxide is too large, a large amount of sludge containing heavy metals will be produced; the ion exchange method is complicated and the resin is easy to age; the cost of the membrane separation method is too high, and the membrane The holes are prone to clogging. Searching f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F1/70C02F1/62
Inventor 刘红彭秀达秦雄范先媛
Owner WUHAN UNIV OF SCI & TECH
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