Method for preparing heavy metal adsorbing material by modifying silk fiber and application of material

An adsorption material and silk fiber technology, applied in the direction of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problem that the adsorption capacity of heavy metal ions is not high, it cannot be directly used as a heavy metal adsorbent, and the content of free amino groups and carboxyl groups There are no major problems, and the effect of being convenient for large-scale application, low cost, and promoting the amount is achieved

Active Publication Date: 2017-09-12
HEZHOU UNIV
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Problems solved by technology

A certain amount of amino acids are distributed on the surface of unmodified silk, which has acid compatibility and solubility, and the surface energy of the particles is high; but its free amino and carboxyl content is not large, and the adsorption capacity of heavy metal ions is not high, so it cannot be directly As a heavy metal adsorbent

Method used

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  • Method for preparing heavy metal adsorbing material by modifying silk fiber and application of material
  • Method for preparing heavy metal adsorbing material by modifying silk fiber and application of material
  • Method for preparing heavy metal adsorbing material by modifying silk fiber and application of material

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Embodiment 1

[0057] Embodiment 1: the influence effect of dispase mass concentration on silk fibroin

[0058]When the mass concentration of neutral protease is 1, 2, 3, 4, 5, 6g / L, the bath ratio is 1:100, the temperature is 60°C, the power is 60%, and the treatment time is 60min, the modified silk (silk fibroin) can be obtained The modified silk 0.3g obtained according to different enzyme mass concentrations is added in 100mg / L (100mL) Cu (Ⅱ) solution respectively, and the adsorption amount adsorption rate change curve of the adsorption of heavy metal Cu (Ⅱ) is as follows: figure 2 shown.

[0059] From image 3 It can be seen that the concentration of enzyme has a significant effect on the adsorption of Cu(II) on silk modified by neutral protease, and it is also one of the factors affecting the adsorption rate. When the concentration of enzyme in the solution increased from 1mg / L to 2mg / L, the adsorption capacity and adsorption rate of heavy metal Cu(II) gradually increased. When the c...

Embodiment 2

[0060] Embodiment 2: the influence effect of neutral protease treatment time on silk fibroin

[0061] When the treatment time is 20, 40, 60, 80, 100, 120min, the enzyme mass concentration is 3g / L, the bath ratio is 1:100, the temperature is 60°C, and the power is 60%, the modified silk (i.e. silk fibroin) is obtained; Weighing 0.3 g of the obtained modified silk according to different treatment times and adding it to 100 mg / L (100 mL) Cu(II) solution, the adsorption capacity and adsorption rate curve of heavy metal Cu(II) are as follows: Figure 4 shown.

[0062] From Figure 4 It can be seen that the enzyme treatment time is also one of the main factors affecting silk fibroin. Under different treatment times, the adsorption amount and adsorption rate have little change and the adsorption effect is good, the adsorption amount is above 31.11 mg / g, and the adsorption rate is above 93%. Therefore, the neutral protease treatment time had little effect on silk fibroin and the ad...

Embodiment 3

[0063] Embodiment 3: the influence effect of dispase treatment temperature on silk fibroin

[0064] When the treatment temperature is 30, 40, 50, 60, 70, 80°C, the mass concentration of neutral protease is 3g / L, the bath ratio is 1:100, and the power is 60%, the modified silk (i.e. modified silk fibroin) can be obtained The modified silk 0.3g obtained according to different treatment temperatures is added in 100mg / L (100mL) Cu (Ⅱ) solution respectively, and the adsorption rate variation curve of the adsorption of heavy metal Cu (Ⅱ) is as follows: Figure 5 shown.

[0065] From Figure 5 It can be seen that the neutral protease treatment temperature also has an effect on silk fibroin. When the temperature increased from 30°C to 50°C, the adsorption capacity and rate increased. At 50°C, the adsorption capacity and rate reached the maximum, which were 34.63 mg / g and 94.89%, respectively. When the temperature increased from 50 °C to 80 °C, the adsorption capacity Both the adsor...

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Abstract

The invention provides a method for preparing a heavy metal adsorbing material by modifying silk fiber and application of the material and belongs to the technical field of adsorbing materials. The method disclosed by the invention comprises the following steps: (1) pretreatment: taking raw silk of silkworms in the current year, putting the raw silk into a weak alkaline solution, adding lipase, alkaline protease and a surface active agent, utilizing ultrasonic wave to treat, soak and boil the raw silk and then utilizing water to washing the raw silk; (2) constant weight: putting the cleaned silk into a freezing and drying box to be dried, then weighing the dried silk, then freezing and drying the silk and then weighing the silk; (3) detection: sampling the constant-weight silk and utilizing a picric acid carmine reagent to detect the silk; (4) modification: directly soaking fibroin in a neutral protease solution, performing ultrasonic wave treatment and then freezing and drying to constant weight to obtain the needed adsorbing material. The preparation method of the novel heavy-metal adsorbing material disclosed by the invention is low in cost, high in efficiency, simple in technology, convenient to operate and convenient for large-scale application.

Description

【Technical field】 [0001] The invention relates to the technical field of preparation of adsorption materials, in particular to a method for preparing heavy metal adsorption materials from modified silk fibers and its application. 【Background technique】 [0002] For water bodies slightly polluted by heavy metals, and the effluent of industrial wastewater containing heavy metals after alkali precipitation treatment, a very significant feature is that trace heavy metal ions are in the concentration of alkali metals and alkaline earth metals, such as Na + , Ca 2+ , Mg 2+ The equivalent content can be as high as hundreds of milligrams per liter. Conventional water treatment processes obviously cannot remove trace amounts of heavy metal ions in water, and require special advanced treatment (such as membrane technology, ion exchange, adsorption, etc.). Membrane separation technology has high separation efficiency and has been valued in the field of heavy metal wastewater treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28023C02F1/286C02F2101/20
Inventor 谢微何星存唐月琼
Owner HEZHOU UNIV
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