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Method for photocatalytically degrading lignin by hydrotalcite-like compound

A technology for catalytic degradation and lignin, applied in the field of hydrotalcite-like photocatalytic degradation of lignin

Inactive Publication Date: 2014-07-30
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are very few reports on hydrotalcite-like degradation of lignin

Method used

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  • Method for photocatalytically degrading lignin by hydrotalcite-like compound
  • Method for photocatalytically degrading lignin by hydrotalcite-like compound
  • Method for photocatalytically degrading lignin by hydrotalcite-like compound

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specific Embodiment approach 1

[0011] Embodiment 1: The method for degrading lignin by hydrotalcite-like hydrotalcites in this embodiment is as follows: 3mg nickel-magnesium-aluminum hydrotalcites are placed in a quartz glass tube, and 60mL concentration of 0.15g / L alkali lignin solution is added, and the light intensity Irradiate under 50W fluorescent lamp for 20 hours to complete lignin degradation.

specific Embodiment approach 2

[0012] Specific embodiment two: the specific method of hydrotalcite-like degradation lignin method in the present embodiment is as follows: 9mg nickel-magnesium-aluminum-like hydrotalcites are placed in the quartz glass tube, add 60mL concentration and be 0.15g / L alkali lignin solution, light intensity Irradiate under 50W fluorescent lamp for 20 hours to complete lignin degradation.

specific Embodiment approach 3

[0013] Specific implementation mode three: the method for degrading lignin by hydrotalcite-like in this embodiment is as follows: 15mg nickel-magnesium-aluminum hydrotalcite is placed in a quartz glass tube, adding 60mL concentration is 0.15g / L alkali lignin solution, light intensity Irradiate under 50W fluorescent lamp for 20 hours to complete lignin degradation.

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Abstract

The invention provides a method for photocatalytically degrading lignin by a hydrotalcite-like compound, which belongs to the field of hydrotalcite-like compound application. The method comprises the following steps: adding the hydrotalcite-like compound in a quartz glass tube, adding a solution containing alkaline lignin, and performing irradiation for 20 minutes to 20 hours with a sunlight lamp or an ultraviolet lamp, thereby finishing degradation of lignin. The irradiation with ultraviolet light and sunlight has a very good influence for the hydrotalcite-like compound on adsorbing and degrading the alkaline lignin, the degradation effect under ultraviolet light is superior to that under sunlight, and the reduction of light absorbance of the solution under ultraviolet light is more remarkable. Nickel, magnesium and aluminum hydrotalcite-like compounds under irradiation of ultraviolet light and sunlight are all superior to nano-titanium dioxide in alkaline lignin degrading effect.

Description

technical field [0001] The invention belongs to the field of hydrotalcite-like applications, and in particular relates to a method for hydrotalcite-like photocatalytic degradation of lignin. Background technique [0002] Alkali lignin is difficult to utilize because of its structure and performance. Due to the high content of methoxyl groups, low content of alcoholic hydroxyl groups, a large amount of syringyl groups and a small amount of guaiacyl groups, the chemical reactivity is low. It can be seen that increasing the content of alcoholic and phenolic hydroxyl groups, reducing the content of methoxyl groups, and enhancing the chemical reactivity of alkali lignin are the basis of lignin chemical reactions and the key issues for the utilization of grass-based alkali lignin. However, there are very few studies on the addition of reactive functional groups in lignin, and there are only some research reports involving this aspect, such as oxidant degradation, high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 王丽丽王宝生孙晓珊伦红叶樊凯悦温煌
Owner NORTHEAST FORESTRY UNIVERSITY
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