Method for preparing smooth cord-grass active carbon for treating cadmium-containing waste water

A technology of Spartina alterniflora and activated carbon, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as suffocation and death of marine organisms, affect tidal flat aquaculture, and decline in water quality, and achieve a good society Benefits, good environmental effects

Inactive Publication Date: 2008-11-19
NANJING UNIV
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Problems solved by technology

However, it grows densely and has a well-developed root system. Grass seeds can fly around with the wind, spread rapidly, and have strong stress resistance and fecundity, which leads to an ecological imbalance in tidal flats and affects the development of aquaculture in tidal flats; leads to silting of waterways; caus

Method used

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  • Method for preparing smooth cord-grass active carbon for treating cadmium-containing waste water

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Experimental program
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Effect test

Embodiment 1

[0023] (1) Dry Spartina alterniflora in the shade, take the stems, dry them in an oven at 120°C, pulverize them with a pulverizer, and pass through a 100-mesh sieve.

[0024] (2) Spartina alterniflora powder was leached with 1% (mass ratio) sulfuric acid solution, wherein the mass ratio of sulfuric acid solution to Spartina alterniflora was 1:10, and the reaction time was 4 hours.

[0025] (3) The solid-liquid mixture is filtered, and the filter residue is injected into a phosphoric acid solution, wherein the mass ratio of phosphoric acid to the original dried Spartina is 1:1, and the reaction time is 12 hours.

[0026] (4) After drying the mixture of Spartina phosphate at 120°C, put it into a tubular resistance furnace, 2 The activation is carried out under the following conditions, wherein the calcination temperature is 700°C, the temperature rise is 5°C / min, and the calcination time at 700°C is 2h.

[0027] (5) Utilize clear water to wash the activated carbon obtained by c...

Embodiment 2

[0030] With other conditions unchanged, the temperature in (4) of Example 1 was changed to 600° C., and the final yield was 45%.

[0031] The activated carbon product obtained by this embodiment has an adsorption capacity of 41.37mgCd for cadmium 2+ / mg activated carbon, the adsorption efficiency of 20mg / L cadmium-containing solution is above 98.9%, and the concentration of 10mg / L cadmium-containing solution after treatment is 0.07mg / L, which has reached the national first-level emission standard.

Embodiment 3

[0033] Other conditions remained unchanged, the reaction time in (3) of Example 1 was changed to 20h, the temperature in (4) of Example 1 was changed to 500°C, and the final yield was 47%.

[0034] The activated carbon product obtained by this embodiment is 28.1mgCd for the adsorption capacity of cadmium 2+ / mg activated carbon, the adsorption efficiency of 20mg / L cadmium-containing solution is above 96.1%, and the concentration of 10mg / L cadmium-containing solution after treatment is 0.07mg / L, reaching the national first-level emission standard.

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Abstract

The invention discloses a preparation method of Spartina alterniflora activated carbon, which can be used for treating cadmium wastewater. The method comprises the steps of oven-drying Spartina alterniflora stem and pulverizing; extracting the pulverized Spartina alterniflora powder with 0.1-10% of sulphuric acid solution for 1-10 hours; filtering the extracted solid-liquid mixture, and immersing the filter residue in phosphoric acid solution for 6-30 hours; oven-drying the immersed phosphoric acid-Spartina alterniflora mixture, activating by calcination at 400-700 DEG C under N2 as a protective gas for 0.5-10 hours to obtain activated carbon powder; and washing the obtained activated carbon powder and pulverizing. The inventive preparation method removes the interference of a large quantity of salts, and obtains the surface functional groups-enriched activated carbon product with yield of 42-48%. The obtained activated carbon can be used for treating cadmium wastewater with adsorption capacity in the range of 11-48.25mg/g, which is much higher than that of common commercial activated carbon. The obtained activated carbon takes full use of waste and creates great economic benefit and good social and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of ecological engineering, and in particular relates to a method for preparing activated carbon capable of treating cadmium-containing wastewater by using Spartina alterniflora. Background technique [0002] Alternatus meadows is native to the southeastern coast of the United States and was introduced to my country in 1979 for the purpose of protecting beaches, improving soil, greening beaches and improving the ecological environment of beaches. In the past 20 years, Spartina has transformed many muddy beaches along the coast of my country from barren land to beach green land, provided huge productivity, and made great contributions to the protection of seawalls and land reclamation in my country. However, it grows densely and has a well-developed root system. Grass seeds can fly around with the wind, spread rapidly, and have strong stress resistance and fecundity, which leads to an ecological imbalance in t...

Claims

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Application Information

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IPC IPC(8): C01B31/08B01J20/20C02F1/28
Inventor 罗兴章聂耳李坤权郑正冯景伟赵国华高顺枝张继彪李继红黄星发邹星星伦琳王卫平
Owner NANJING UNIV
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