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Nanometer magnetic iron oxide and preparation method and application thereof

A technology of iron oxides and arsenic compounds, which is applied in the field of environmental water treatment, can solve the problems of unfavorable industrialized large-scale wastewater treatment, low adsorption capacity, and difficult recovery, and achieves the effects of fast adsorption speed, large adsorption capacity, and simple preparation

Active Publication Date: 2012-09-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, various adsorbents for arsenic in the aqueous phase are difficult to recover, easily cause secondary pollution, and have defects such as low adsorption capacity, which is not conducive to industrialization and large-scale wastewater treatment.

Method used

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  • Nanometer magnetic iron oxide and preparation method and application thereof
  • Nanometer magnetic iron oxide and preparation method and application thereof
  • Nanometer magnetic iron oxide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 2mmol of FeCl 3 with 1mmol FeCl 2 Add 30ml of double distilled water, under stirring at 1000rpm, quickly add 7.5ml of 25% ammonia water, stir and react at room temperature for 20min, use a magnet to absorb the reaction product, separate from the liquid phase, wash 3 times with deionized water, and obtain the product The rate is 98.4%.

[0026] The particle size of the product is between 8-12nm, with figure 1 The transmission electron microscope (TEM) image of the prepared nano-scale magnetic iron oxide particles is attached. figure 2 The photo of the nano-scale magnetic iron oxide particles recovered by using a permanent magnet with a magnetic field strength of 0.5T is attached. image 3 X-ray diffraction pattern (XRD) of the prepared nano-scale magnetic iron oxide particle adsorbent, attached Figure 4 is the hysteresis curve of the prepared nano-scale magnetic iron oxide particle adsorbent. From the above, it can be seen that the product has a correct structure ...

Embodiment 2

[0028] 10mmol of FeCl 3 with 5mmol FeCl 2 Add 150ml of double distilled water, under stirring at 1000rpm, quickly add 38.5ml of 25% ammonia water, stir and react at room temperature for 20min, use a magnet to absorb the reaction product, separate from the liquid phase, wash 3 times with deionized water, and obtain the product The rate is 98.9%, and the particle diameter of this product is 8-12nm.

Embodiment 3

[0030] 20mmol of FeCl 3 with 10mmol FeCl 2 Add 300ml of double distilled water, under stirring at 1000rpm, quickly add 77ml of 25% ammonia water, stir at room temperature for 20min, use a magnet to absorb the reaction product, separate it from the liquid phase, and wash it with deionized water for 3 times. It is 96.8%, and the particle diameter of this product is 8-12nm.

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Abstract

The invention discloses nanometer magnetic iron oxide and a preparation method and application thereof. The method comprises the following steps of: uniformly mixing FeCl3, FeCl2 and a pH value mutagen in a solvent for reaction, and thus obtaining the iron oxide after the reaction. According to the method, an adsorbent can be quickly prepared at normal temperature under a high-speed stirring condition by a method for quickly changing the pH value of the prepared liquor by using 25 percent ammonia water. An arsenic adsorbent prepared by the method has a series of advantages of simple preparation process, low cost, high adsorption quantity, high adsorption speed, low influences of aqueous environments, recycling simplicity and the like which contribute to industrial application.

Description

technical field [0001] The invention belongs to the field of environmental water treatment, and relates to a nanometer magnetic iron oxide and its preparation method and application. Background technique [0002] Arsenic has a cumulative effect in animals and plants, and has a serious hazard of "carcinogenic, teratogenic, and mutagenic" to humans. Even if a small amount of arsenic accumulates in the human body, it can cause various diseases such as skin ulceration, high blood pressure, and keratinization. The World Health Organization stipulates that the total arsenic content in drinking water should not exceed 0.01 mg / L, and the total arsenic content in industrial wastewater discharge should not exceed 0.5 mg / L. According to this standard, people in many parts of the world are poisoned by arsenic-contaminated water, such as Bangladesh, Vietnam, Mongolia, India, Chile, etc. Among them, Bangladesh is the most serious. Due to geographical reasons, arsenic is present in almost...

Claims

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Application Information

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IPC IPC(8): C01G49/02B01J20/06B01J20/28B01J20/30
Inventor 林森卢滇楠刘铮
Owner TSINGHUA UNIV
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