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Charcoal and magnetic Fe3S4 composite nano-adsorbent, and preparation method and application thereof

A nano-adsorption and biochar technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of limited adsorption treatment capacity, slow adsorption treatment speed, and difficult discharge standards , to achieve the effect of shortening the processing time, fast settling speed, and saving operating costs

Inactive Publication Date: 2017-06-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used adsorption materials have a slow adsorption treatment speed and limited adsorption treatment capacity. When completing the treatment of electroplating wastewater, a large amount of adsorbents need to be invested, resulting in a large amount of sludge, which is likely to cause secondary pollution problems.
Especially after the country promulgated the latest discharge standards for electroplating wastewater in 2008, it is difficult to achieve standard discharge by traditional methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 10g of biochar and put it in 1000mL distilled water, sonicate for 5min; then add 20g of FeCl 3 , magnetic stirring and mixing for 5min, and then configure the sulfur source (CN 2 h 4 S 10g, n-butylamine 50mL, distilled water 150mL), the sulfur source was slowly injected at 50°C under the state of magnetic stirring and reacted for 2h. After cooling to room temperature, the adsorbent was separated with a magnet, washed, and vacuum-dried at 50°C for 6 hours to obtain biochar magnetic Fe 3 S 4 Composite nanosorbents. After testing, Fe on the surface of the composite nano-adsorbent 3 S 4 The loading amount is about 70wt%.

[0032] The prepared biochar magnetic Fe 3 S 4 Put the composite nano-adsorbent into distilled water, configure it into a 10% nano-homogeneous slurry, inject it into the electroplating wastewater containing copper, chromium, and nickel (pH value 6), stir it at a speed of 150 rpm at room temperature at 20°C, and mix the wastewater The copper,...

Embodiment 2

[0034] Weigh 20g of biochar and place it in 2000mL distilled water, sonicate for 5min; then add 40g of Fe 2 (SO 4 ) 3 , ultrasonically mixed for 5min, and then configure the sulfur source (CH 3 CSNH 2 15g, n-butylamine 20mL, distilled water 80mL), under the state of magnetic stirring, the sulfur source aqueous solution was slowly injected into the biochar-iron-salt mixed solution at 30°C, and reacted for 5h. After cooling to room temperature, the adsorbent was separated with a magnet, washed, and vacuum-dried at 60°C for 10 hours to obtain biochar magnetic Fe 3 S 4 Composite nanosorbents. After testing, Fe on the surface of the composite nano-adsorbent 3 S 4 The loading amount is about 50wt%.

[0035] The above-mentioned biochar magnetic Fe 3 S 4 The application of composite nano-adsorbent in the treatment of electroplating wastewater, adding the adsorbent to distilled water to form a 20% nano-homogeneous slurry, is used to remove heavy metal ions in electroplating w...

Embodiment 3

[0037] Weigh 50g of biochar and place it in 3000mL distilled water, and disperse with magnetic stirring for 5min; then add 50g of Fe(NO 3 ) 3 , magnetically stirred and mixed thoroughly for 5 minutes, and then the sulfur source (Na 2 S 60g, distilled water 100mL), under the state of magnetic stirring, slowly inject the aqueous solution of sulfur source into the mixed solution of biochar and iron salt at 40°C, and react for 2h. After cooling to room temperature, the adsorbent was separated with a magnet, washed, and vacuum-dried at 50°C for 12 hours to obtain biochar magnetic Fe 3 S 4 Composite nanosorbents. After testing, Fe on the surface of the composite nano-adsorbent 3 S 4 The loading amount is about 60wt%.

[0038] The above-mentioned biochar magnetic Fe 3 S 4 The application of composite nano-adsorbent in the treatment of electroplating wastewater, the adsorbent is added into distilled water and configured into 8% nano-homogenous slurry, which is used to remove h...

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Abstract

The invention relates to a charcoal and magnetic Fe3S4 composite nano-adsorbent, and a preparation method and an application thereof. The adsorbent is obtained through loading Fe3S4 nano-crystals on a carrier charcoal in an in-situ manner, wherein the mass proportion of the Fe3S4 nano-crystals is 20-80%. The adsorbent is prepared from an iron salt-containing solution, a sulfur source and charcoal through a low-temperature loading technology, and is used for removing copper, chromium and nickel ions from electroplating wastewater. Compared with adsorbents in the prior art, the adsorbent prepared in the invention has the advantages of very good electroplating wastewater treatment effect through using rapid ion exchange, effective removal of heavy metals from the wastewater, convenience in use, no increase of a device or a technology, implementation of magnetic separation recovery through using magnet after adsorption completion, and effective reduction of the electroplating wastewater treatment cost.

Description

technical field [0001] The invention relates to the field of electroplating wastewater treatment, in particular to a biochar magnetic Fe 3 S 4 Composite nanoadsorbent and its preparation and application. Background technique [0002] As one of the basic processes of manufacturing industry, electroplating plays a great role in promoting economic development. However, the electroplating industry is also a typical heavy metal pollution industry in my country. A large amount of electroplating wastewater generated during the production process, such as electroplating cleaning water, waste electroplating solution, and equipment cooling water, often contains relatively high concentrations of chromium, nickel, and copper. Some heavy metal ions are even carcinogenic and teratogenic, and if they are not handled properly, they will cause great harm to human health and the ecological environment. [0003] At present, the comprehensive wastewater treatment methods used in electroplatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F103/16
CPCB01J20/20B01J20/0229B01J20/28009C02F1/283C02F2103/16
Inventor 李良孔龙刘敏
Owner SHANGHAI JIAO TONG UNIV
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