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Vulcanizing-agent-modified Fe3O4 magnetic nanoparticle adsorbent and preparation method and application thereof

A magnetic nanometer and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., can solve the problems of complex solid-liquid separation, unstable sedimentation, low processing capacity, etc., and achieve large adsorption capacity , simple preparation process and easy recovery

Active Publication Date: 2014-07-02
武汉中地华盾环境发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these adsorbents and chemical reagents have slow reaction speed, low processing capacity and high cost
At the same time, the heavy metal-containing sediment produced by the chemical precipitation method is unstable and may cause secondary pollution to the treated liquid; after the conventional adsorbent is used to adsorb and treat wastewater, it usually needs to use filtration, centrifugation and other means, and the solid-liquid separation is more complicated.

Method used

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  • Vulcanizing-agent-modified Fe3O4 magnetic nanoparticle adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 2.7g FeCl 3 ·6H 2 O, 7.2g anhydrous sodium acetate and 3g polyethylene glycol PEG 1000 Ultrasonic treatment in a beaker containing 80ml of ethylene glycol solution for 30min, then transferred to a 100ml high-temperature reaction kettle, reacted at 200°C for 8h, after cooling, the precipitate was washed repeatedly with absolute ethanol, and the sample was kept under the condition of a vacuum of -1Mpa Drying under , the magnetic nano-Fe 3 o 4 ;

[0029] Weigh 0.5g magnetic nano-Fe 3 o 4 Place in the reactor that fills 60ml ethylene glycol solution, configure 40ml vulcanizing agent solution simultaneously (sulfur 0.1g, PEG 1000 2g). The vulcanizing agent solution was injected into the reactor at 2.8 μl / s, and the magnetic nanoparticles were vulcanized at 180° C. under the protection of nitrogen.

[0030] After the injection is completed, the adsorbent is separated from the solution by magnetic separation, washed with absolute ethanol, and dried under vacuum a...

Embodiment 2

[0033] Weigh 4.0g Fe(NO) 3 9H 2 O, 5.2g urea and 3g polyethylene glycol PEG 1000 In a beaker containing 60ml of ethylene glycol solution, ultrasonically treat for 30min, then transfer to a 100ml autoclave, react at 200°C for 8h, after cooling, the precipitate is washed repeatedly with absolute ethanol, and dried in vacuum to obtain magnetic nano-Fe 3 o 4 ;

[0034] Weigh 0.5g magnetic nano-Fe 3 o 4 Place in a reactor filled with 60ml triethylene glycol solution, and configure 40ml vulcanizing agent solution (thiourea 0.2g, ammonium citrate 0.47g) at the same time. The vulcanizing agent solution was injected into the reactor at 5.6 μl / s, and the magnetic nanoparticles were vulcanized at 270° C. under the protection of nitrogen.

[0035]After the injection is completed, the adsorbent is separated from the solution by magnetic separation, washed with absolute ethanol, and dried under vacuum at room temperature. It is detected that the loading amount of FeS on the surface o...

Embodiment 3

[0038] Weigh 2.7g FeCl 3 ·6H 2 O, 5.2g ethylenediamine and 2g polyethylene glycol PEG 1000 Ultrasonic treatment in a beaker containing 60ml of propylene glycol solution for 30min, then transferred to a 100ml autoclave, reacted at 200°C for 6h, after cooling, the precipitate was repeatedly washed with absolute ethanol, and dried in vacuum to obtain magnetic nano-Fe 3 o 4 ;

[0039] Weigh 0.5g magnetic nano-Fe 3 o 4 Place in a reactor filled with 60ml of propylene glycol solution, and configure 40ml of vulcanizing agent solution (2.36ml of n-dodecanethiol, 0.57g of trisodium citrate) at the same time. The vulcanizing agent solution was injected into the reactor at 5.6 μl / s, and the magnetic nanoparticles were vulcanized at 180° C. under the protection of nitrogen.

[0040] After the injection is completed, the adsorbent is separated from the solution by magnetic separation, washed with absolute ethanol, and dried under vacuum at room temperature. It is detected that the l...

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Abstract

The invention relates to a vulcanizing-agent-modified Fe3O4 magnetic nanoparticle adsorbent and a preparation method and an application thereof. The adsorbent is Fe3O4 magnetic nanoparticles which are subjected to surface vulcanization by a sulfur compound, and the weight percentage of sulfide on the adsorbent is 10-15 percent. The adsorbent is added into heavy metal wastewater and fully contacts with heavy metal ions through stirring, Fe2+ ions of the surface of the adsorbent material are utilized to exchange with the heavy metal ions so as to adsorb the heavy metal ions in the wastewater, and the adsorbent is separated from the wastewater by utilizing a magnet. Compared with the prior art, the prepared adsorbent has the advantages of low cost, large adsorption capacity, high reaction speed, significant processing effect and the like. Meanwhile, the magnetism can be quickly enriched under the action of an external magnetic field, and therefore, the adsorbent can be effectively separated and recycled and cannot cause secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to a vulcanizing agent modified magnetic nano-Fe 3 o 4 Adsorbents are used to treat heavy metal wastewater, mainly through Fe in the adsorbent 2+ It is exchanged with heavy metal ions in wastewater and separated by magnetic separation technology. Background technique [0002] With the acceleration of industrialization, water pollution in my country is becoming more and more serious, and heavy metals are the most common pollutants in sewage. Heavy metal wastewater from electroplating, non-ferrous metallurgy, fuel, chemical and instrumentation industries poses a serious hazard to the ecological environment due to its high toxicity, bioaccumulation and persistence in the natural environment. Therefore, these wastewater containing heavy metals must be treated to reduce the concentration of heavy metals in the water to below the specified level before being discharged into t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 李良孔龙瞿赞
Owner 武汉中地华盾环境发展股份有限公司
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