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

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...

AI Technical Summary

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; causes water quality to decline and marine life to suffocate death, and induce red tides, etc.

[0003] At present, the research on the utilization of Spartina alterniflora is only in its infancy, and there are few reports on the use of Spartina alterniflora to produce activated carbon to treat cadmium-containing wastewater

Images