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Zero-valent-iron-pillared montmorillonite repairing material, and preparation method and applications thereof

A repair material, a technology of montmorillonite, applied in the field of zero-valent iron pillared montmorillonite repair material and its preparation

Active Publication Date: 2017-07-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the application of zero-valent iron-modified montmorillonite mainly focuses on the adsorption treatment of heavy metal-contaminated wastewater and the reduction and degradation of organic pollutants, but there are very few reports on the activation of persulfate as a catalyst to remove refractory organic matter.

Method used

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  • Zero-valent-iron-pillared montmorillonite repairing material, and preparation method and applications thereof
  • Zero-valent-iron-pillared montmorillonite repairing material, and preparation method and applications thereof
  • Zero-valent-iron-pillared montmorillonite repairing material, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing a zero-valent iron pillared montmorillonite restoration material, comprising the following steps:

[0048] Step 1: Weigh 10 g of calcium-based montmorillonite and disperse it in 200 ml of 0.1M NaCl solution, stir thoroughly in a constant temperature water bath at 60°C for 2 h, after standing for 2 h, place the sodium product in a centrifuge and centrifuge Separate, discard the supernatant, add 100 ml of 0.1M NaCl solution, stir thoroughly in a constant temperature water bath at 60°C for 2 h, let it stand for 2 h, put the sodiumized product in a centrifuge for centrifugation, discard the supernatant, and then Add 50 ml of 0.1M NaCl solution, stir thoroughly in a constant temperature water bath at 60°C for 2 h, and after standing for 24 h, place the sodiumized product in a centrifuge for centrifugation, discard the clear liquid, wash 5 times with distilled water, and finally remove the sodium The chemical product was dried at 60°C, and then ground t...

Embodiment 2

[0054] A zero-valent iron pillared montmorillonite repair material prepared in Example 1 is used to efficiently activate permonosulfate (PMS) to remove refractory organic matter, including the following steps:

[0055] Step 1: Accurately weigh 0.4 g NaOH and 0.4 g TBBPA in turn, add water to a 100 ml volumetric flask to prepare a 4 g / L TBBPA stock solution, and accurately measure 5 mL of 4 g / L TBBPA stock solution in a 2000 mL volumetric flask Dilute to 10 mg / L TBBPA solution in the volumetric flask;

[0056] Step 2: Prepare to measure 250mL of 10 mg / L TBBPA solution in a 500mL beaker, and then accurately weigh 0.0154 g of PMS and 0.0125 g of Fe in sequence 0 -Mt in a 500 mL beaker, extract the TBBPA solution in the 5 ml beaker with a syringe every 5 min, and measure the UV-vis spectrum of TBBPA in the solution with a UV spectrophotometer; the relevant results are as follows Figure 5 As shown, the complete degradation of TBBPA can be realized within 15min;

[0057] Step 3: ...

Embodiment 3

[0060] The first step: other steps are the same as in Example 1, except that in the fourth step, the hydroxyl iron pillared montmorillonite is heated to 300 °C at a heating rate of 5 min / °C in a mixed atmosphere of hydrogen and nitrogen with a volume ratio of 50:50. °C, 500 °C, 700 °C and 900 °C for 3 hours, and the reduced products were ground and sieved to obtain zero-valent iron pillared montmorillonite repair materials obtained by thermal reduction at different temperatures; compared the thermal reduction at different temperatures XRD patterns of zero-valent iron pillared montmorillonite restoration materials (such as Figure 8 shown), it was found that the characteristic peaks (110) and (200) of zero-valent iron could be observed;

[0061] Step 2: Prepare and measure 4 parts of 250 mL of 10 mg / L TBBPA solution in four 500 mL beakers, accurately weigh 4 parts of 0.0154 g of PMS in 250 mL of TBBPA solution, and then accurately weigh 0.0125 g of Fe0-Mt obtained by thermal r...

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Abstract

The invention discloses a zero-valent-iron-pillared montmorillonite repairing material, and a preparation method and applications thereof, and belongs to the field of environment functional material. According to the preparation method, the zero-valent-iron-pillared montmorillonite repairing material is obtained via high temperature reduction of hydroxy-iron-pillared montmorillonite at a mixed atmosphere of hydrogen and nitrogen. The preparation method comprises following main steps: 1, preparation of sodium montmorillonite; 2, preparation of a polyhydroxy iron pillaring solution; 3, preparation of hydroxy-iron-pillared montmorillonite; and 4, preparation of the zero-valent-iron-pillared montmorillonite repairing material via high temperature reduction calcinations at the mixed atmosphere of hydrogen and nitrogen. The zero-valent-iron-pillared montmorillonite repairing material can be used for removing degradation-resistant organic pollutants, and degrading peroxymonosulfate into small molecular organic matters.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and in particular relates to a zero-valent iron pillared montmorillonite repair material and a preparation method and application thereof. Background technique [0002] Brominated flame retardants (BFRs), as the most consumed organic flame retardants in the world, are widely used in plastics, textiles, circuit boards and other flammable materials to reduce their flammability. Brominated flame retardants mainly include tetrabromobisphenol A (TBBPA), polybrominated diphenyl ethers (PBDEs), polybrominated biphenyls (PBBs) and hexabromocyclododecane (HBCD). Among them, TBBPA has good flame retardant performance and simple synthesis process. It is the most widely used brominated flame retardant, accounting for 59% of the world's usage, and as high as 76% in Asia. TBBPA has the characteristics of lipophilicity, bioaccumulation, persistence, and long-range atmospheric transport. It has...

Claims

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Application Information

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IPC IPC(8): B01J23/745C02F1/72C02F101/38
CPCB01J23/745C02F1/725C02F2101/40C02F1/281C02F1/288B01J21/16B01J37/04B01J37/16C02F2101/36
Inventor 吴平霄杨珊珊朱能武
Owner SOUTH CHINA UNIV OF TECH
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