Preparation method and applications of ferrous sulfide/biological carbon composite material

A technology of composite materials and ferrous sulfide, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the problem of no reduction ability, insufficient growth of nanometer zero-valent iron particles, no FeS/ BC composite materials and other issues

Active Publication Date: 2017-07-21
NANKAI UNIV
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Problems solved by technology

However, most of these materials only have adsorption capacity, and they are not effective for Cr( ) does not have the ability to restore
At present, there is no research on FeS / BC composite materials
In addition, some studies have reported the preparation of zero-valent iron and BC composite materials. For example, Li Fangbai et al. disclosed an iron-based biochar material, its preparation process and its application in soil pollution control. However, the preparation method reported first Add reducing agent sodium borohydride solution, and then add emulsifier (Tween series, Span series or polyvinyl alcohol), which may lead to the insufficient growth of nano-sized zero-valent iron particles on the surface of biochar

Method used

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  • Preparation method and applications of ferrous sulfide/biological carbon composite material
  • Preparation method and applications of ferrous sulfide/biological carbon composite material
  • Preparation method and applications of ferrous sulfide/biological carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: This implementation provides a simple preparation method of FeS / BC composite material.

[0026] 1. Preparation of biochar (BC) material

[0027] Dry and crush the wheat straw to a particle size of ~2 mm, weigh 10 g of the crushed wheat straw into a ceramic crucible (as full as possible to reduce the presence of oxygen), and put it into an oven (DGG-9023A, Shanghai Senxin Experimental Instrument Co., Ltd. company, China) at 80 ºC. Nitrogen was vented on the surface of the dried straw, sealed with aluminum foil and covered, and the above system was placed in a muffle furnace (SX-GO7102, Tianjin Zhonghuan Experimental Electric Furnace Co., Ltd., China) for 2 h at 600 ºC with limited oxygen . After the lysis, the prepared BC was treated with 500 mL of 1.0 M HCl solution for 24 h, and then the BC was washed repeatedly with distilled water until the pH was neutral (the pH could reach neutral after about 10 washes). The cleaned BC was then dried in an oven at 80 ...

Embodiment 2

[0035] Embodiment 2: FeS / BC composite material is to Cr ( ) removal effect experiment

[0036] In order to investigate the effect of FeS / BC on Cr( ) removal effect, the experimental grouping is set as follows: (1) BC; (2) FeS; (3) FeS / CMC; (4) FeS / BC (it should be noted that in the material named FeS / BC here containing CMC); (5) the control group, only wastewater (CK).

[0037] Add 42 mL of 100 mg / L Cr( ) solution, and arrange experiments according to the above settings, the dosage of each material is set according to its proportion in the composite material, namely: BC 238 mg / L, FeS 238 mg / L, FeS / CMC 476 mg / L, FeS / BC 714 mg / L. The pH of the reaction system was 5.5, and nitrogen was passed through during the experiment preparation to prevent the material from being oxidized. The vials were equilibrated on a rotary shaker at 40 rpm for 3 days at room temperature. All experimental groups and control groups were set up in three parallel groups. During the experiment, sa...

Embodiment 3

[0039] Embodiment 3: FeS / BC composite material is to Cr ( ) Toxic effect experiment on wheat seed growth under the action of

[0040] In order to investigate the biotoxicity of FeS / BC composites, the experiment selected wheat seeds, and studied the addition of Cr( ), the effect of FeS / BC composites on the germination of wheat seeds. 20 wheat seeds were added to the plate respectively, and the experimental settings were as follows: (1) control group, only 6 mL distilled water was added; (2) 6 mL distilled water and 16 mg FeS / BC composite were added; (3) 6 mL concentration of 300 mg / L Contains Cr( ) waste water (ie: Cr( ) is 1.8 mg); (4) Add 6 mL of 300 mg / L Cr( ) wastewater and 16 mg of FeS / BC composite. Two parallel samples were set up for each group of experiments, and the growth of wheat germ was observed after 14 days. The results were as follows: image 3 shown. From image 3 It can be seen that compared with CK, the FeS / BC composite has no obvious inhibitory ...

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Abstract

The present invention discloses an efficient ferrous sulfide / biological carbon composite material and a preparation method thereof, and applications of the ferrous sulfide / biological carbon composite material in repair of heavy metal pollution water bodies. According to the present invention, biological carbon is adopted as a carrier, a ferrous sulfate solution and the biological carbon are mixed, sodium carboxymethyl cellulose is added as a stabilizer and a dispersant, a sodium sulfide solution is added to the system in a dropwise manner under the nitrogen protection, and vigorous stirring is performed to make the generated ferrous sulfide nanoparticles uniformly grow on the surface of the biological carbon, such that the disadvantage that the ferrous sulfide nanoparticles are easily agglomerated is substantially improved so as to increase the effective contact area between the ferrous sulfide nanoparticles and the pollutant, and the adsorption ability and the oxidation reduction ability of the ferrous sulfide and the biological carbon are integrally combined so as to improve the pollutant removal ability; the preparation method has advantages of simple and rapid process, low production cost, environmental protection and no secondary pollution; and the efficient ferrous sulfide / biological carbon composite material can strongly repair the Cr(VI) polluted water body, can effectively reduce the biological toxicity of the Cr(VI) on wheat seeds, and has wide application prospects in the fields of repair of organic pollution and inorganic pollution in environments.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials and water treatment, and relates to the preparation of a ferrous sulfide / bio-char composite material and its effect on Cr( ) removal of pollution. Background technique [0002] The rapid development of the electroplating, tanning and metalworking industries has led to large amounts of chromium-containing wastewater entering the environment. The removal of chromium in wastewater has always been one of the hot and difficult points in environmental science research. Chromium mainly exists in two stable states of hexavalent and trivalent in wastewater, of which hexavalent chromium (Cr( )) is far more toxic to the ecosystem and the human body than trivalent chromium (Cr( )), so the Cr( ) reduced to Cr( ), reducing its toxicity, and then removing chromium from water by adsorption is one of the more effective restoration methods. [0003] Ferrous sulfide nanoparticle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/70C02F1/72C02F1/62C02F101/22
CPCC02F1/288C02F1/70C02F1/72C02F2101/22
Inventor 吕宏虹宫艳艳唐景春王琳刘君成黄耀
Owner NANKAI UNIV
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