A kind of microwave carbonized persimmon skin biosorbent and its preparation method and application

A technology for biological adsorbent and persimmon peel, which is applied in the field of microwave carbonized persimmon peel biological adsorbent and its preparation field, can solve the problems of increasing processing cost, making the best use of persimmon peel, aggravating environmental pollution and the like, and achieving low cost and a degree of concentration. The effect of high and low equipment requirements

Active Publication Date: 2020-06-09
JINGCHU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously, most of the persimmon skins produced by persimmon fruit processing enterprises were directly buried or incinerated as waste. This measure not only failed to make the best use of persimmon skins, but also aggravated environmental pollution and increased processing costs.

Method used

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  • A kind of microwave carbonized persimmon skin biosorbent and its preparation method and application
  • A kind of microwave carbonized persimmon skin biosorbent and its preparation method and application
  • A kind of microwave carbonized persimmon skin biosorbent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Example 1: Preparation of Microwave Carbonized Persimmon Skin Biosorbent

[0081] The raw persimmon skin waste is washed with water to remove soil, sand and other sundries, dried in a constant temperature drying oven at 65°C for 6 hours, and then crushed into granular powder with a size of 60-100 mesh by a high-speed pulverizer for future use. Weigh 5 g of persimmon peel powder and add 20 mL of 50% phosphoric acid aqueous solution, and stir at room temperature for 2 h with a magnetic stirrer to dehydrate and activate it. The dehydration-activated product was heated and carbonized in a microwave oven with a power of 800W for 8 minutes to solidify and cross-link to prepare an adsorbent. The crude adsorbent was first washed three times with deionized water, then washed once with 0.1mol / L NaOH aqueous solution, and finally washed repeatedly with deionized water until neutral; Drying under high temperature for 6 hours; pulverize until the particles pass through a 60-100 mes...

Embodiment 2

[0084] Example 2: Utilizing microwave carbonized persimmon skin biosorbent to adsorb heavy metal ions such as lead, copper and nickel in aqueous solution——comparison of adsorption effects under different pH conditions

[0085] Weigh 20mg of the biosorbent prepared in Example 1 in a 50mL Erlenmeyer flask with different pH values ​​(pH values ​​are 2.0, 3.0, 4.0, 5.0 and 6.0) and 20mL, and the initial concentration is 60mg / L lead, copper and nickel The ion solution was mixed, then oscillated in a constant temperature oscillator at 25°C at 200r / min for 2h, filtered, and the concentration of heavy metal ions in the solution before and after adsorption was measured by atomic absorption spectrometer, and the adsorption rate was calculated according to the following equation:

[0086]

[0087] The results show that the adsorption effect of microwave carbonized persimmon skin biosorbent on lead, copper, nickel, etc. Figure 4 . Depend on Figure 4 It can be seen that the adsorben...

Embodiment 3

[0088] Example 3: Utilizing microwave carbonized persimmon skin biosorbent to adsorb heavy metal ions such as lead, copper and nickel in aqueous solution——comparison of adsorption effects under different initial ion concentrations

[0089] Take by weighing the biosorbent prepared by 20mg embodiment 1 in the 50mL Erlenmeyer flask, be respectively 10mg / L, 20mg / L, 30mg / L, 40mg / L, 50mg / L with 20mL initial ion concentration, the lead of pH 5.5 , copper and nickel ion solutions, then shake in a constant temperature oscillator at 25°C at 200r / min for 2h, filter, and calculate the adsorption rate:

[0090] The results show that the adsorption effect of the adsorbent on lead, copper, nickel, etc. Figure 5 . In the concentration range of 10-50mg / L, as the initial ion concentration increases, the adsorption capacity increases linearly. When the maximum initial concentration is 50mg / L, the adsorption rates of lead, copper and nickel ions are respectively 99.3%, 94.5% and 88.6%. The ad...

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Abstract

The invention discloses a microwave carbonized persimmon exocarp biological adsorbent as well as a preparation method and an application thereof. A raw material of the biological adsorbent is an agricultural waste, is nearly free of cost and rich in source, and the preparation cost of the adsorbent is low; the prepared biological adsorbent is used for removing heavy metal ions in waste water, and follows an idea of source, environment, circulation and sustained development, so that a purpose of treatment of wastes with processes of wastes against one another is achieved. The preparation method is simple and feasible, energy-saving and efficient, easy for condition control, free of waste water, exhaust gas and wastes, not high in demand on equipment and convenient for industrial application; the adsorption capacity and efficiency of the biological adsorbent on heavy metal ions are less affected by the environment temperature and the initial concentration, in the adsorption process, temperature does not need to be controlled, and ions in a relatively large range can be efficiently adsorbed, so that the adsorbent is suitable for treating large volume low concentration heavy metal waste water; and heavy metal ions can be eluted with a dilute acid after adsorption, and the concentration degree is high, and the adsorbent can be recycled, so that no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the field of natural product biosorbents, in particular to a microwave carbonized persimmon skin biosorbent and its preparation method and application. Background technique [0002] The rapid development of modern industry has produced a large amount of wastewater containing heavy metals. These wastewaters pose a great threat to the environment and human life because they are non-degradable and easy to accumulate in organisms through the food chain. Toxic and harmful heavy metals such as lead, copper and nickel usually come from industrial wastewater such as electroplating, battery processing and recycling, mineral mining and refining. There are many methods for treating wastewater containing heavy metal ions, among which chemical precipitation method, electrochemical method, ion exchange method, solvent extraction method, membrane separation method, etc. have been studied more. Although these methods have high treatment effic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/0259B01J20/20C02F1/281C02F1/283C02F2101/20
Inventor 易庆平罗正荣张青林闵慧玉樊睿怡朱德艳陈晗王劲松
Owner JINGCHU UNIV OF TECH
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