Oil-absorbing material for wastewater treatment and preparation method thereof

Abstract

The invention provides an oil-absorbing material for wastewater treatment and a preparation method thereof, which is made from agricultural and forestry wastes, is green and environmentally friendly, and has good hydrophobic and oil-absorbing properties. The invention carries out hydrophobic modification on the agricultural and forestry wastes, which greatly improves the oil absorption effect. Moreover, the oil-absorbing material of the present invention is gel-like, has low density, can float on the water surface, and is convenient to use and recycle. Agricultural and forestry waste is processed into coarse powder with a particle size of 1-10mm and fine powder with a particle size of ≤100nm, which increases the gel strength, effectively prolongs the service life, and ensures the oil absorption effect. The invention utilizes citric acid, inulin, etc. to construct a gel system, and a large amount of hydrogen bonds enhance the gel strength, prolong the service life of the oil-absorbing material, and enhance the oil-absorbing effect. After the demoulding, the hydrophobic modification of the obtained material was also carried out to further improve the hydrophobic effect, which is conducive to the further improvement of the oil absorption effect.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an oil-absorbing material for wastewater treatment and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of modern industry and the continuous improvement of people's living standards, the production, transportation and use of petroleum and various oil products have become a part of modern life. However, oil tanker leakage accidents, industrial oily wastewater discharge and other problems are also becoming more and more serious. In the process of oil exploitation, transportation, loading and unloading, processing and use, oil spill accidents from tankers and oily sewage discharge from ships often occur, resulting in the death of a large number of marine organisms and bringing unprecedented disasters to the economy and the environment. In addition, more and more industrial and municipal sewage and water-insoluble ...

AI Technical Summary

Problems solved by technology

[0004] People continue to use porous substances such as plant straws, clay, and sponges as oil-absorbing materials, but they generally have the disadvantages of low oil absorption, oil absorption and water absorption.

Later, people synthesized hydrophobic materials with polypropylene as the main material, and prepared oil-absorbing pads and oil-absorbing sticks with certain shapes. When selectively absorbed, it will also absorb a considerable part of water

Then people developed methacrylate oil-absorbing materials, which formed three-dimensional network macromolecules through cross-linking. However, although this type of resin has good oil-water selectivity, its oil absorption ratio still cannot meet the ideal requirements, and the oil absorption time is usually longer. , it usually takes several hours or even more than ten hours to reach the saturated oil absorption capacity. More importantly, its oil absorption type is single and can only absorb small molecular oils. It is almost impossible to absorb, and it is even more impossible to absorb the crude oil leaked on the ocean.

From the perspective of environmental protection, using natural biomass as raw material has greater advantages. However, plant cellulose has more hydroxyl groups and strong hydrophilicity, so the oil absorption capacity is weak and the oil retention rate is poor. At the same time, the floating The performance is not good, therefore, the plant fiber needs to be modified to improve its oil absorption performance

[0005] Patent CN106076266B discloses an oil-absorbing material and its preparation method and use. It is made by mixing wood or agricultural waste with an acetylated modified lignin solution. However, the oil-absorbing capacity of the oil-absorbing material obtained after this modification is still very low, the highest It is only 18g / g, which is far from meeting the actual needs of wastewater treatment