Anhydride modified passion fruit peel bio-adsorbent and preparation method and application thereof

A technology of biosorbent and passion fruit peel, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve the problems of slow adsorption rate, low adsorption capacity, and restricted application, and achieve low cost and high The effect of adsorption capacity and easy operation

Inactive Publication Date: 2021-02-12
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, some agricultural and forestry wastes such as grapefruit peels, banana peels, mango peels, peanut shells, coconut shells, potato peels, and rice husks are often used as biosorbents in the adsorption method, but there are generally low adsorption capacity and slow adsorption rate. problems, which seriously restrict the practical application

Method used

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  • Anhydride modified passion fruit peel bio-adsorbent and preparation method and application thereof
  • Anhydride modified passion fruit peel bio-adsorbent and preparation method and application thereof
  • Anhydride modified passion fruit peel bio-adsorbent and preparation method and application thereof

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preparation example Construction

[0036] The invention provides a kind of preparation method of acid anhydride modified passion fruit peel biosorbent, comprising the following steps:

[0037] Dispersing the passion fruit peel raw material in the first NaOH solution for the first treatment to obtain the first NaOH treatment product;

[0038] Dispersing the first NaOH-treated product in a second NaOH solution, then adding hydrogen peroxide dropwise for bleaching, then sequentially performing solid-liquid separation, washing with water to neutrality, and freeze-drying to obtain a pretreated material;

[0039] The pretreatment material is mixed with an acid anhydride for esterification reaction, and the resulting esterification product is dispersed in a saturated sodium bicarbonate solution to obtain the acid anhydride-modified passion fruit peel biosorbent, and the acid anhydride is succinic anhydride or maleic anhydride .

[0040] In the present invention, the passion fruit peel raw material is dispersed in the...

Embodiment 1

[0066] figure 1 The preparation and application flowchart of a kind of succinic anhydride modified passion fruit peel biosorbent provided in Example 1.

[0067] The preparation method of succinic anhydride modified passion fruit peel biosorbent, concrete steps are as follows:

[0068] (1) Collect passion fruit peel waste from passion fruit orchards, fully wash, cut into pieces, dry, crush, and pass through a 60-100 mesh sieve to obtain passion fruit peel raw materials;

[0069] (2) Disperse 20 g of passion fruit peel raw material in 400 mL of 2 mol / L NaOH solution, stir at 80 °C for 4 h, filter and wash with suction. Disperse the product in 400 mL of NaOH solution with a concentration of 1 mol / L, heat to 50 °C, add 200 mL of hydrogen peroxide dropwise, continue stirring for 60 min, filter with suction, wash with deionized water until neutral, and freeze-dry , crushed to obtain the pretreated material.

[0070] (3) Add 2 g of pretreated material to 20 g of molten succinic an...

Embodiment 2

[0079] Figure 6 The preparation and application flowchart of a kind of maleic anhydride modified passion fruit peel biosorbent provided in Example 2.

[0080] The preparation method of maleic anhydride modified passion fruit peel biosorbent, concrete steps are as follows:

[0081] (1) Collect the passion fruit peel waste from the food factory, fully wash, cut into pieces, dry, crush, and pass through a 60-100 mesh sieve to obtain the passion fruit peel raw material;

[0082] (2) Disperse 20 g of passion fruit peel raw material in 400 mL of 2 mol / L NaOH solution, stir at 80 °C for 4 h, filter and wash with suction. Disperse the product in 400 mL of NaOH solution with a concentration of 1 mol / L, heat to 50 °C, add 200 mL of hydrogen peroxide dropwise, continue stirring for 60 min, filter with suction, wash with deionized water until neutral, and freeze-dry , crushed to obtain the pretreated material.

[0083] (3) Add 2 g of pretreatment materials and 20 g of maleic anhydride...

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Abstract

The invention provides an anhydride modified passion fruit peel bio-adsorbent and a preparation method and application thereof, and belongs to the technical field of environmental functional materialsand water pollution control. According to the invention, the passion fruit peel is used as a raw material and contains a large amount of cellulose, hemicellulose, lignin and different functional groups such as hydroxyl, carboxyl and the like, so that the passion fruit peel has very strong adsorption performance on dye molecules in water. Through anhydride modification, more carboxyl groups are introduced, so that the adsorption performance of the adsorbent on cationic dyes and heavy metal ions can be improved. The succinic anhydride modified passion fruit peel bio-adsorbent prepared by the preparation method has a very good adsorption effect on methyl violet and methylene blue, high adsorption capacity and strong reproducibility, and the prepared maleic anhydride modified passion fruit peel bio-adsorbent has a good adsorption effect on various heavy metals, wherein the adsorbent has a very good adsorption effect on Pb < 2 + > and Cd < 2 + >, relatively high adsorption capacity and relatively short adsorption equilibrium time.

Description

technical field [0001] The invention relates to the technical fields of environmental functional materials and water pollution control, in particular to an acid anhydride-modified passion fruit peel biosorbent and its preparation method and application. Background technique [0002] In the process of rapid industrial development, industries such as dyestuffs, mining and metallurgy, machinery manufacturing, chemicals, electronics, and instruments produce a large amount of heavy metal wastewater and dye wastewater every year. Heavy metal wastewater is directly discharged into natural water bodies without treatment. A large amount of enrichment, enter the human body through the food chain, cause chronic / acute poisoning to the human body, and seriously endanger human health. After the dye wastewater enters the natural water body, it will increase the chroma of the water body, affect the normal life and activities of aquatic animals and plants, and destroy the ecology of the water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/24B01J20/22C02F1/286C02F2101/20C02F2101/308
Inventor 陈凯伟林华郑君里刘远立
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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