Magnetically separated bamboo charcoal-based wastewater treatment agent and preparation method and application thereof

A wastewater treatment agent and magnetic separation technology, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, and other chemical processes, can solve the problems of high density, small adsorption capacity, application limitations, etc., and achieve good adsorption performance, adsorption Improve capacity and solve the effect of small adsorption capacity

Inactive Publication Date: 2013-04-03
QUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnetic nanoparticles are a promising new type of wastewater treatment material in recent years. They have strong magnetism and are easy to separate and recycle. However, due to their shortcomings such as high density and small adsorption capacity, their application in the environmental field is also limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 9.3 g of treated bamboo charcoal powder and ultrasonically disperse to 100 mL containing 13.75 g Fe(NO 3 ) 3 9H 2 O and 4.95 g Co(NO 3 ) 2 ·6H 2 O solution, add an appropriate amount of 1.0 mol / L sodium hydroxide solution dropwise under stirring to adjust the pH=9, heat up to 100 °C and stir for 2 h. After standing and stratifying, filter under reduced pressure; soak the precipitate with 0.1 mol / L hydrochloric acid solution for 2 h, filter with suction, and wash repeatedly with deionized water until neutral; vacuum-dry at 80 °C for 24 h, transfer the dried product to into a crucible and sintered at about 300 °C for 2 h to obtain CoFe 2 o 4 Bamboo charcoal-based wastewater treatment agent. Add 100 mg of this treatment agent to 50 mL of methylene blue solution with a concentration of 150 mg / L and pH=7. After ultrasonic dispersion for 0.5 h, turn to slow stirring for 3 h. After magnetic separation and sedimentation, the supernatant was washed with 0.45 Spectr...

Embodiment 2

[0034] Weigh 9.3 g of treated bamboo charcoal powder and ultrasonically disperse to 100 mL containing 13.75 g Fe(NO 3 ) 3 9H 2 O and 4.95 g Co(NO 3 ) 2 ·6H 2 O solution, add an appropriate amount of 25% ammonia solution dropwise under stirring to adjust the pH=7, heat up to 80 ° C and stir for 2 h. After static layering, suction filtration under reduced pressure; repeated washing with deionized water until neutral; vacuum drying at 80 °C for 24 h, and sintering at about 300 °C for 2 h to obtain CoFe 2 o 4 Bamboo charcoal-based wastewater treatment agent. Add 100 mg of this treatment agent to 50 mL of methyl orange solution with a concentration of 50 mg / L and pH=7, and the rest are as in Example 1. The results show that the treatment agent obtained in this embodiment has an adsorption capacity of 19.7 mg / g to methylene blue, and a chromaticity removal rate of 78.6%.

Embodiment 3

[0036] Ultrasonic dispersion of 6.0 g bamboo charcoal powder into 100 mL contained 13.99 g Fe(NO 3 ) 3 9H 2 O and 4.35 g Mn(NO 3 ) 2 4H 2 O mixed solution, under stirring, dropwise add 1 mol / L sodium hydroxide solution to adjust pH=10, heat up to 90 °C and stir for 3 h. After standing and stratifying, filter under reduced pressure; soak the precipitate with 0.2 mol / L hydrochloric acid solution for 2 h, filter with suction, wash repeatedly with deionized water until neutral; dry in vacuum at 100 °C for 24 h, and sinter at about 300 °C for 2 h h, to make MnFe 2 o 4 Bamboo charcoal-based wastewater treatment agent. 100 mg of this treatment agent was added to 50 mL of Cr (Ⅵ) concentration in the solution of 10 mg / L, pH=3, all the others were as in Example 1, and the results showed that the treatment agent obtained in this embodiment had a significant effect on Cr (Ⅵ). The adsorption capacity is 4.59 mg / g, and the removal rate is 91.7%.

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Abstract

The invention discloses a magnetically separated bamboo charcoal-based wastewater treatment agent and a preparation method and the application of the treatment agent. The saturation magnetization intensity of the treatment agent is 5-10 emu/g, and the specific surface area of the treatment agent is 90-130 m<2>/g. The treatment agent is prepared via the following steps: (1) cleaning bamboo charcoal, suction filtration, drying, breaking and obtaining bamboo charcoal powder; (2) weighting two or more types of transitional metal salts, adding deionized water, preparing and obtaining a mixed solution; (3) dispersing the bamboo charcoal powder into the mixed solution, ultrasonically and uniformly stirring, dropwise adding precipitant, depositing, regulating pH value to 7-10, heating, stirring at a constant temperature to react, standing, layering, pressure reducing, suction filtration, and obtaining a deposit; and (4) immersing the deposit in hydrochloric acid solution, suction filtration, scrubbing to neutrality, drying and sintering. The treatment agent is applicable to treatment of dye wastewater, fluoride wastewater, or heavy metal ion wastewater, is large in specific surface area, good in absorption performance, time-saving, safe, efficient, inexpensive, environmentally-friendly, economic, and simple in process, and can achieve continuous separation and recovery.

Description

[0001] Technical field [0002] The present invention involves the technology field of new functional materials in the environment of environmental nano, especially a magnetic separation of bamboo charcoal -based wastewater treatment agent and its preparation method. Background technique [0003] Bamboo charcoal is the main solid product obtained by the heating and decomposition of bamboo materials. It has a huge comparison area, developed pores, good adsorption properties and stable chemical properties.It is a good water purification material that can adsorb inorganic and organic pollutants in water phase, and can effectively remove the chroma and chemical oxygen demand for wastewater.Compared with the traditional use of activated carbon, it has the advantages of wide source and low production costs.However, it is more difficult to separate and recycle bamboo charcoal as a water treatment agent in practical applications, because traditional filtering technology is likely to caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28
Inventor 许青青徐天有
Owner QUZHOU UNIV
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