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This is a scene that reporters saw today at the School of Chemistry and Chemical Engineering at Lanzhou University. It is said that this functional material produced by chemical conversion of chemical raw materials from papermaking wastewater is expected to be reused for wastewater treatment.
This black powder with photocatalytic activity does not adsorb the dye molecules but instead decomposes the dye molecules into carbon dioxide and water.
A binder made from lignin in papermaking wastewater instead of some chemical raw materials can be used for wood processing. Its characteristics are: no free formaldehyde, the water resistance, aging resistance and strength of the processed wood are much higher than that of urea-formaldehyde rubber.
The most commonly used type of wood adhesive is urea-formaldehyde rubber, but the amount of free formaldehyde in the glue is very large and it is difficult to completely remove it in the general process, resulting in a long period of high concentration in home and office decoration and furniture. The release of formaldehyde on the ground endangers personal health and severely pollutes the environment.
Experts here pointed out that with the increasing protection of forestry resources, the contradiction between the supply and demand of timber has become more prominent. Therefore, the application of wood adhesives will be very extensive. It is of great significance for increasing the utilization rate of wood and promoting the comprehensive utilization of wood. The use of papermaking wastewater (black liquor) instead of some chemical raw materials made of wood adhesive is environmentally friendly, and has a good development prospects.
Landa uses papermaking wastewater to produce environmentally friendly chemical products
The researchers used a lignin from the papermaking wastewater (black liquor) to make a black powder. The black powder with photocatalytic activity was put into the dye solution. Under the natural light, the dye solution gradually faded. After ten minutes The fade rate can reach more than 90%.