Hexavalent chromium adsorbent and preparation method and application thereof

Abstract

The invention discloses a hexavalent chromium adsorbent and a preparation method and application thereof, and belongs to the technical field of environmental protection. According to the hexavalent chromium adsorbent and the preparation method and application thereof, edible fungus waste matrix-fungus chaff serves as the material, the advantages that the fungus chaff is loose and porous, large in specific surface area and rich in active group are utilized, and the fungus chaff is modified and prepared into an anion adsorbent and used for adsorbing hexavalent chromium which exists in an anionic form in electroplating wastewater. The fungus chaff modified adsorbent is used for treating hexavalent chromium wastewater, and on the condition that the pH is 5.5, the initial concentration of hexavalent chromium is 100 mg / L, the dosage of the adsorbent is 3 g / L, the adsorption time is 120 min, the temperature is 25 DEG C, and the rotating speed is 150 r / min, the adsorption quantity can reach 31.5 mg / g. The hexavalent chromium adsorbent and the preparation method and application thereof have the main advantages that agricultural solid waste resource recovery is achieved, contamination of waste fungus chaff to environment is reduced, the fungus chaff is applied to water pollution treatment simultaneously, resource utilization of agricultural solid waste is achieved, and the hexavalent chromium adsorbent has the advantages of being wide in material resource, low in preparation cost, easy to operate, high in adsorption efficiency and the like and can be widely applied to treatment of industrial wastewater in electroplating, printing and dyeing, tanning, metallurgy and the like.

Description

technical field [0001] The present invention relates to a hexavalent chromium adsorbent and its preparation method and application, in particular to an adsorbent made by pretreatment of mushroom chaff wastes harvested from edible fungi, and also to a preparation method of the adsorbent and Its use in the biological adsorption treatment of low-concentration heavy metal polluted wastewater. The invention belongs to the technical field of environmental protection. Background technique [0002] With the development of my country's economy and the continuous expansion of development scale, heavy metal pollution is becoming more and more serious. There are nearly 10,000 electroplating enterprises in my country, covering 33 major categories of national economic industries involving hexavalent chromium, 130 medium industries, and 267 small industries, covering all provinces, autonomous regions and municipalities directly under the central government. The electroplating industry pr...

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Problems solved by technology

In my country's electroplating industry, less than 30% of enterprises have completely treated wastewater. On the one hand, a large amount of toxic chromium enters natural water bodies. On the other hand, a large amount of chromium in wastewater is deposited in sludge, and most of these sludge are placed around farmland in the countryside. Nearly 10% of the sludge is applied to farmland, which causes chromium pollution in natural water bodies and soil, and then transfers to the human body through plants and animals, which is extremely harmful

[0004] my country's edible fungus industry is developing rapidly. Fungus chaff is the waste substrate after harvesting edible fungi. The annual output of fungus chaff in my country is nearly 70 million tons, but most of the fungus chaff is piled up or burned, which wastes resources and pollutes the environment.

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