Bentonite-loaded sulfurized nanoscale zero-valent iron composite material and preparation method and application thereof

A technology of nano-zero-valent iron and composite materials, applied in chemical instruments and methods, alkali metal compounds, inorganic chemistry, etc., can solve the problems of easy aggregation of nano-zero-valent iron and low activity of nano-zero-valent iron, and achieve strong reactivity , increase the adsorption performance, the vulcanization process is simple and pollution-free

Inactive Publication Date: 2017-08-22
山东大学深圳研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the relatively low activity of pure bentonite-loaded nano-zero-valent iron in the prior art, the simple vulcanization-modified nano-zero-valent iron is easy to agglomerate, and the lack and insufficiency ...

Method used

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  • Bentonite-loaded sulfurized nanoscale zero-valent iron composite material and preparation method and application thereof
  • Bentonite-loaded sulfurized nanoscale zero-valent iron composite material and preparation method and application thereof
  • Bentonite-loaded sulfurized nanoscale zero-valent iron composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1, preparation of bentonite-supported sulfide nano-zero-valent iron composite material

[0057] 80mL ethanol, 20mL water, 0.5g bentonite and 2.415g FeCl 3 ·6H 2 O was added to the four-necked flask, stirred at 300rpm and nitrogen flow rate of 500mL / min for 30min, weighed 1.0133g of sodium borohydride and 0.08g of sodium hydroxide dissolved in 40mL of oxygen-free deionized water, and used a constant pressure funnel to Add 2 drops / second to the four-necked flask, and at the same time add 0.5mL 1mol / L Na at 1-2 drops / second 2 S solution. After reacting for 30 minutes, it was centrifuged and washed with anaerobic deionized water and ethanol solution respectively to obtain a bentonite-loaded sulfurized nano-zero-valent iron composite material with a sulfur-iron molar ratio of 0.056:1. The composite material was added into 50 mL of oxygen-free deionized water and sonicated for 5 min to obtain a 20 g / L solution.

[0058] The X-ray photoelectron spectrum (XPS) of...

Embodiment 2

[0067] Embodiment 2, remove the application of 4-nitrophenol in waste water

[0068] The maximum ultraviolet absorption peak of 4-nitrophenol is 317nm (under acidic conditions).

[0069]According to a series of 4-nitrophenol solutions with known concentrations, measure the corresponding ultraviolet absorbance to obtain a standard curve of absorbance and concentration.

[0070] Utilize the composite material prepared in embodiment 1 and its comparative examples 1-3 to remove 4-nitrophenol in the pesticide wastewater, the concentration of 4-nitrophenol in the wastewater is 1.5mmol / L, the steps are as follows:

[0071] (1) Measure 1L of pesticide wastewater containing p-nitrophenol, place it in an open reactor, add 0.1420g of sodium sulfate (concentration 1mM), and adjust pH=6 with NaOH solution and HCl solution with a mass fraction of 20%;

[0072] (2) Add the composite materials prepared in Example 1 and Comparative Examples 1-3 respectively to the solution, so that the concen...

Embodiment 3

[0074] Embodiment 3, remove the application of orange yellow I in the waste water

[0075] The maximum ultraviolet absorption peak of Orange I is 476nm.

[0076] According to a series of orange I solutions with known concentrations, measure the corresponding ultraviolet absorbance to obtain a standard curve of absorbance and concentration.

[0077] Utilize the composite material prepared in Example 1 and Comparative Example 1 to remove orange I in printing and dyeing wastewater, the concentration of orange I in the wastewater is 100mg / L, the steps are as follows;

[0078] (1) Take 1L of orange yellow I simulated waste water and open reactor, add 0.1420g sodium sulfate (concentration 1mM), adjust pH=6.0 with NaOH and HCl solution with a mass fraction of 20%;

[0079] (2) Add the bentonite-loaded sulfide nano-zero-valent iron composite material prepared in Example 1 into the reactor, so that its concentration is 1.0g / L, the rotating speed is 400r / min, and the room temperature i...

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Abstract

The invention relates to a bentonite-loaded sulfurized nanoscale zero-valent iron composite material and a preparation method and application thereof. According to the composite material, sulfurized modified nanoscale zero-valent iron is loaded on bentonite; the mass ratio of bentonite to total iron is (0.85-1.2):1, and the molar ratio of a sulfur element to total iron is (0.05-0.065):1. The bentonite-loaded sulfurized nanoscale zero-valent iron composite material is more stable and efficient, and is suitable for treatment of multiple pollutants; electron transfer on the surface of the nanoscale zero-valent iron can be accelerated through sulfurized modification and corrosion is promoted, thereby greatly improving the reaction activity of the material; furthermore, the sulfuration process is simple and is free of pollution; and the material is not easy to reunite when loaded on bentonite and the activity can be kept for a long period of time. The removal rate of the material on 4-nitrophenol within 2min reaches over 97.5%, and the removal rate on orange I is close to 100%.

Description

technical field [0001] The invention relates to a bentonite-loaded vulcanized nano-zero-valent iron composite material and a preparation method and application thereof, belonging to the technical field of waste water treatment. Background technique [0002] Iron is a very common substance in our life. Due to its active chemical properties, abundant sources, low price, high electronegativity and certain specific surface area, it is widely used to degrade and remove organic pollutants and inorganic pollutants in the environment. polluting substances. Since the beginning of the 21st century, the discovery of nanometer zero-valent iron has brought a broader space for the development of zero-valent iron. Nano-zero-valent iron can reduce various halogenated hydrocarbons, nitric acid / nitrite, high-valent metal ions, various pesticides and herbicides, etc., and the raw materials for preparing nano-zero-valent iron are abundant and low-cost. In addition, nano-zero-valent iron parti...

Claims

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Application Information

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IPC IPC(8): B01J20/12C02F1/00C02F1/28B01J20/30B01J20/28C02F101/30C02F101/34C02F101/38
CPCB01J20/12B01J20/02B01J20/0266B01J20/28059B01J2220/42C02F1/00C02F1/281C02F2101/308C02F2101/345C02F2101/38
Inventor 许春华王亚浩贾甜甜
Owner 山东大学深圳研究院
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