Preparation method of biomass adsorption material for treating heavy metals in domestic sewage

Abstract

The invention discloses a preparation method of a biomass adsorbing material for treating heavy metals in domestic sewage. The preparation comprises the following steps: treating rice hulls by using low-temperature corona irradiation equipment, adding into a mixed solution of ammonium carbonate and melamine, and carrying out ultrasonic soaking to obtain pretreated rice hulls; extruding and puffingthe pretreated rice hulls by adopting a double-screw extruding and puffing machine to obtain puffed rice hulls; adding the rice hull puffed material, methyl acrylate and allyl thiourea into toluene,then introducing high-purity nitrogen to remove oxygen, and carrying out irradiation grafting under sealing to obtain a rice hull grafted product; mixing the rice hull grafted product, graphene oxideand amino acid, then adding the mixture into a ball milling tank, and carrying out low-temperature ball milling; and adding the ball-milled material into water, carrying out high-temperature and high-pressure soaking and swelling treatment, and filtering to obtain the biomass adsorbing material. The biomass adsorption material obtained by the preparation method has the characteristic of large specific surface area, and has a good adsorption effect on heavy metals in rural sewage.

Description

technical field [0001] The invention relates to a preparation method of a biomass adsorption material, in particular to a preparation method of a biomass adsorption material used for heavy metal treatment in domestic sewage. Background technique [0002] With the development of rural areas and the improvement of living standards, the amount of domestic sewage in rural areas continues to increase, and the rural environment is declining. The focus of environmental pollution has gradually shifted from cities to towns and villages. Rural domestic and production wastewater contains a large amount of organic and inorganic Pollutants, especially in the process of rural livestock and poultry breeding, if unqualified feed containing additives such as Cu, Zn, As, Cd, Cr, Pb and Hg is used, the long-term application of livestock and poultry manure and its compost products will have a negative impact on farmland heavy metals. The pollution of the environment is becoming more and more se...

AI Technical Summary

Problems solved by technology

Among them, the adsorption method is the most effective method to recover trace heavy metal elements, which has the advantages of low cost, fast processing speed and wide application range, but it is easily restricted by adsorbents and has low selectivity.

Adsorbents prepared on the basis of biomass materials have the advantages of good selectivity, good molding, and high stability, but the biomass adsorbents disclosed in the prior art have the problem of poor removal of heavy metals in the treatment of heavy metals in rural wastewater.

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