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Magnetic ferroferric oxide nano particle and graphene composite, as well as preparation method and application thereof

A technology of ferric oxide and composite materials, applied in the field of magnetic ferric oxide nanoparticles-graphene composite materials and their preparation, can solve the problems of increased electrode cost, high price, limited reserves of precious metal Pt and the like

Inactive Publication Date: 2016-12-07
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limited reserves and high price of precious metal Pt, the cost of the counter electrode is greatly increased, which affects the future large-scale production of DSCs.
In addition, from some current research results, it is found that the Pt counter electrode has a negative effect on the S 2- / S n 2- ,T - / T 2 The catalytic activity of the isoelectric pair is not high, which affects the energy conversion efficiency of the entire DSCs

Method used

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  • Magnetic ferroferric oxide nano particle and graphene composite, as well as preparation method and application thereof
  • Magnetic ferroferric oxide nano particle and graphene composite, as well as preparation method and application thereof
  • Magnetic ferroferric oxide nano particle and graphene composite, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Magnetic Fe3O4 nanoparticle-graphene composite material (Fe 3 O 4 @RGO) Preparation

[0040] To 32.4g of ferric chloride hexahydrate, 24g of polyethylene glycol (PEG), 14.4g of sodium hydroxide, and 110.688g of graphene oxide were added 240ml of ethylene glycol (EG), and then magnetically The stirrer stirs to make it fully dissolved. Then mix these four solutions and stir evenly. Put it into a reaction kettle, heat it in an oven at 200 degrees Celsius and keep it for 24 hours to obtain a magnetic ferroferric oxide nanoparticle-graphene composite material.

[0041] This embodiment uses micron-level graphene oxide materials (such as figure 1 ), this micron-sized graphene oxide can greatly increase the specific surface area of ​​the composite material. BET test shows that its specific surface area is 64.3m 2 / g. The adsorption desorption curve can be seen ( figure 2 ), the shape of the hysteresis ring is H3, shaped like a crescent, and relatively long and narrow. ...

Embodiment 2

[0043] Example 2: Fe 3 O 4 @RGO composite material adsorption test for hexavalent chromium ions

[0044] 1. Preparation of hexavalent chromium standard solution:

[0045] Since the color of hexavalent chromium is not very obvious, we added the color developer diphenylcarbazide ethanol solution (DPCI) as Cr 6+ Ion concentration probe. The specific standard solution and standard curve are as follows: Take five 50ml colorimetric tubes, numbered 1-5. Take 0.10, 0.18, 0.35, 0.75, 1.50ml of 100mg / L potassium dichromate solution in the above 50ml colorimetric tube, and then add two drops of mixed acid to it, and then add 1.5ml of color developer diphenyl Carbohydrazide ethanol solution (DPCI). Shake the above solution, add water to dilute to 50ml, and make the volume constant, which is the standard color scale.

[0046] From Image 6 It can be seen that after adding DPCI, the standard solution showed a deep red ( Image 6 The upper middle image, from left to right, the colors darken in t...

Embodiment 3

[0049] Example 3: Fe 3 O 4 @RGO composite material adsorption test for CdS nanoparticles

[0050] Since the ultraviolet-visible absorption spectrum of CdS nanoparticles has no peak, only the macroscopic separation phenomenon can be observed. From Picture 8 It can be seen that the solution changes from orange to yellow ( Picture 8 Center left picture) becomes clear and transparent ( Picture 8 Middle right picture), which shows that nanoparticles in the dispersion can also be adsorbed, which shows that Fe 3 O 4 @RGO composite material has obvious adsorption effect on CdS nanoparticles. Finally we calculate 1 gram of Fe 3 O 4 @RGO composite material can adsorb 1.37g CdS nanoparticles. From this point of view, the substance can be used to effectively adsorb suspended nano-solid pollutants in sewage, so as to achieve the purpose of purifying sewage.

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Abstract

The invention discloses a magnetic ferroferric oxide nano particle and graphene composite. The specific surface area of the composite is 60-65m<2> / g, in the composite, ferroferric oxide particles are 10-35nm in size, and ferroferric oxide supports graphene flaky materials, so as to ensure that the flaky materials are stacked up to form gaps, and the gaps are 20 to 100 nm. The composite provided by the invention is used for wastewater treatment, the ferroferric oxide in the composite not only can be used for effectively removing chrome in wastewater, but also cannot produce sludge and cause secondary pollution. Moreover, due to the strong adsorbability of graphene, nano particles and suspended solids can be removed and waste water can be purified well. The invention provides a method which can control sewage in a cheap, reliable and recycling way. A hexavalent chromium ion absorbed composite is taken as an electrocatalyst for being applied to counter electrodes of a dye-sensitized solar cell, therefore, refuse reclamation is achieved, waste is reduced, and resources are saved.

Description

Technical field [0001] The invention relates to the technical field of sewage treatment and the technical field of electrocatalysts, in particular to a magnetic ferroferric oxide nanoparticle-graphene composite material and a preparation method and application thereof. Background technique [0002] Metallic chromium is a harmful heavy metal, especially hexavalent chromium has strong toxicity. Chromium-containing wastewater is a kind of industrial wastewater that is harmful to the environment. Chromium-containing wastewater mainly comes from smelting, electroplating, mechanical processing and leather processing industries. For a long time, the treatment of chromium pollution has been the focus of the world. Countries have invested manpower and material resources to conduct extensive research for this, and have obtained certain research results and invention patents. So far, the methods used to treat hexavalent chromium wastewater are mainly chemical methods. The process includes:...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J20/28C02F1/28C02F1/62C02F1/72C02F1/70H01G9/20
CPCY02E10/542Y02W10/37B01J20/20B01J20/06B01J20/28009B01J2220/4806B01J2220/4812C02F1/28C02F1/281C02F1/283C02F1/70C02F1/72C02F2101/22H01G9/2022
Inventor 周华伟尹杰柴宁任茹蓁姜华承郭俊雪范爱芬
Owner LIAOCHENG UNIV
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