Modified peanut shell adsorbent for treating sunset yellow dye wastewater and its preparing method and application thereof

Abstract

The invention discloses modified peanut shell adsorbent for treating sunset yellow dye wastewater and a preparing method and application thereof. The preparing method includes: washing, crushing and screening peanut shells; adding epoxy chloropropane into the screened peanut shell powder, mixing them well, adding NaOH solution to allow reaction, performing filtering, washing and drying after reaction so as to obtain epoxy cellulose ether intermediate; mixing the epoxy cellulose ether intermediate and ethylene diamine, adding Na2CO3 solution to allow reaction, performing filtering, washing and neutralizing after reaction, and performing drying to obtain the modified peanut shell adsorbent. By modifying the peanut shells with the epoxy chloropropane and the ethylene diamine, the physical strength of the modified peanut shell adsorbent is improved, the number of surface active functional groups is greatly increased, and adsorption effect of the peanut shells is enhanced. Additionally, wastewater is disposed via the peanut shells, disposing cost of the wastewater is effectively reduced, the great volume of existing low-cost green resources is made use, and a novel way to comprehensively use agricultural wastes is provided.

Description

technical field [0001] The invention relates to a modified peanut shell adsorbent, in particular to a modified peanut shell adsorbent for treating sunset yellow dye wastewater, a preparation method and application thereof. Background technique [0002] my country produces about 6 million tons of peanut pods annually, and about 2 million tons of peanut shells are produced during the peanut processing process. Only a small part of these peanut shells are used as raw materials for fiberboards, and most of the others are left idle or burned as fuel, thereby Cause a large amount of waste of resources, so people begin to seek the rational utilization way of peanut shell. Considering that the peanut shell has a high porosity and a large specific surface area, and the lignin, cellulose, hemicellulose and other components contained in the peanut shell contain active functional groups such as hydroxyl and carboxyl on the surface, therefore, people use it as an adsorbent. However, if i...

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Problems solved by technology

[0003] Sunset yellow, also known as sunset red, sunset red, orange, edible yellow No. 3, is an azo pigment. The existing technology shows that azo compounds can be metabolized in the body to generate mutagen precursors --- aromatic amine compounds. The benzene ring in the structure has a strong inhibitory effect on organisms. Therefore, it is difficult to use biological methods to degrade sunset yellow into small inorganic molecules, and further advanced treatment of the dye wastewater is required to reduce its environmental pollution.

At present, the research on this kind of printing and dyeing wastewater mainly focuses on physical adsorption, chemical reagent oxidation, membrane treatment, photocatalytic oxidation, and microbial degradation treatment. However, most of these methods have problems such as high cost, cumbersome operation, and high energy consumption. leading to restrictions on its promotion and application

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