Preparation method of phosphorous removal adsorbent of expanded graphite loading lanthanum hydroxide

Abstract

The invention relates to the technical field of a phosphorous removal adsorbent of expanded graphite loading lanthanum hydroxide and a preparation method of the phosphorous removal adsorbent. By taking expanded graphite as a matrix, the phosphorous removal adsorbent is loaded with hydroxide of a metal lanthanum, namely La(OH)3. The preparation method comprises the following steps: firstly preparing a 0.2-0.12mol / L lanthanum nitrate solution; preparing a lanthanum hydroxide precipitate; adding 0.2g of expanded graphite; oscillating for 20-120 minutes at constant temperature of 25 DEG C; after oscillation, centrifugalizing; taking out a solid in an upper layer; drying for 12 hours at 105 DEG C; and sealing for later use. The phosphorous removal adsorbent has a relatively high removal effect on phosphorous in water and the adsorption capacity can reach 16-20mg / g, and moreover, the phosphorous removal adsorbent further has the advantages of being easy to recover, stable to remove phosphorous, corrosion-resistant, heat-resistant, non-toxic and the like. The phosphorous removal adsorbent is simple in preparation process, low in energy consumption and short in time and has a broad application prospect.

Description

technical field [0001] The invention relates to a phosphorus-removing adsorbent with expanded graphite supporting lanthanum hydroxide and a preparation method thereof. Background technique [0002] According to incomplete statistics, in recent years, the number of main lakes in my country that are in eutrophication has reached more than 80%, resulting in frequent outbreaks of red tides, blue-green algae and green algae in water bodies, and the harm to our life and production is becoming more and more serious. Eutrophication of water bodies has become a major environmental problem in water environment protection worldwide. The excess of phosphorus is the main cause of water eutrophication. Effectively reducing the phosphorus content in water is an important way to prevent and control water eutrophication and water pollution. The research and development of efficient and economical phosphorus removal agents is a very urgent task in the field of environmental protection. [0...

AI Technical Summary

Problems solved by technology

Expanded graphite has good adsorption for formaldehyde, coal, petroleum and other fuel waste gas and small organic molecules, but its adsorption capacity for phosphorus is very weak.

The active rare earth lanthanum has the outstanding advantages of high phosphorus adsorption capacity and strong specific selectivity, but the price of rare earths is high and difficult to recycle in actual use.