Molecular sieve composite material for adsorbing heavy metal in water and method for preparing molecular sieve composite material

Abstract

The invention relates to a molecular sieve composite material for adsorbing heavy metal in water and a method for preparing the molecular sieve composite material. The technical scheme includes that the method comprises preparing molecular sieve powder and attapulgite powder and uniformly mixing the molecular sieve powder and the attapulgite powder with each other according to a mass ratio of the molecular sieve powder to the attapulgite powder so as to obtain molecular sieve / attapulgite powder; adding distilled water or thickening agent solution into the molecular sieve / attapulgite powder and uniformly stirring the molecular sieve / attapulgite powder and the distilled water or the thickening agent solution to obtain mud-block-shaped molecular sieve mixed materials; pressing the mud-block-shaped molecular sieve mixed materials to obtain strips or columns and drying the strips or the columns under the condition of the temperature of 100-120 DEG C for 2-4 h so as to obtain dried molecular sieve mixed materials; crushing and sieving the dried molecular sieve mixed materials to obtain particles with the particle sizes of 0.45-0.9 mm, and calcining the particles in a muffle furnace under the condition of the temperature of 550-650 DEG C for 2-3 h to obtain the molecular sieve composite material for adsorbing the heavy metal in the water. The mass ratio of the molecular sieve powder to the attapulgite powder is 1-(0.4-2.0). A mass ratio of the molecular sieve / attapulgite powder to the stilled water or the thickening agent solution is 1:(0.3-0.6). The molecular sieve composite material and the method have the advantages of low production cost and simple processes. Besides, the molecular sieve composite material is high in strength and adsorption capacity and is applicable to treating heavy metal wastewater.

Description

technical field [0001] The invention belongs to the field of molecular sieve composite materials for wastewater treatment. Specifically relates to a molecular sieve composite material for adsorbing heavy metals in water and a preparation method thereof. Background technique [0002] In recent decades, with the rapid development of human social economy and modern industry, heavy metal pollution has become more and more serious, among which heavy metal pollution in wastewater is the most serious. If heavy metal wastewater is discharged into rivers and lakes, it will seriously damage the ecological environment. Heavy metals can also affect human health through food chain accumulation. Long-term intake of excessive heavy metals by the human body can lead to teratogenicity, mutagenesis, carcinogenicity and other diseases. Therefore, the purification treatment of heavy metal wastewater has become the focus of current environmental protection work. [0003] At present, the treat...

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Problems solved by technology

Although the above-mentioned most commonly used methods have their own advantages, the existing problems are: fine sedimentation particles require a sedimentation tank; it is difficult to completely separate new fine particles from water; the water treatment effect is unstable; sedimentation sludge is hazardous waste, and the amount of sludge Large, high moisture content and difficult sludge treatment

Although the ion exchange method has little environmental pollution, less sludge and a small footprint of the ion exchange device, its cycle is longer, the one-time investment is large, and the presence of organic matter will pollute the ion exchange resin, and the resin of the ion exchange method needs to be regenerated and aging

Although the membrane separation method has high and stable effluent quality, less sludge generation, is carried out under normal temperature conditions, has no phase change, good selectivity and strong adaptability, but due to the high energy consumption of the membrane modules, it is easy to be polluted and blocked, and the cost is relatively low. High, so the wide application of this technology is limited

Adsorption method is a relatively common method used in heavy metal wastewater treatment process. It is a water treatment process that uses porous solid adsorbents to separate heavy metals in wastewater. Commonly used adsorbents include zeolite, activated carbon, bentonite and attapulgite. High removal efficiency, no secondary pollution and moderate cost, but the cost of activated carbon is relatively high, zeolite, bentonite and attapulgite are not strong enough, and they are easy to disperse in water

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