Method for absorbing heavy metal in solution through carboxylic nano-crystal cellulose magnetic particles

Abstract

The invention relates to a method for absorbing heavy metal in solution through carboxylic nano-crystal cellulose magnetic particles. The method comprises the steps of preparing microcrystal cellulose into nano-crystal cellulose, then preparing nano-crystal cellulose magnetic particles through graft modification and finally wrapping the nano-crystal cellulose magnetic particles in microcapsules to obtain nano-crystal cellulose magnetic particle absorbing agent. The absorbing agent can be used for absorbing heavy metal ions in the solution. According to the method, the microcrystal cellulose is prepared into the nano-crystal cellulose, then nano-crystal cellulose magnetic particles are prepared through graft modification, and finally the nano-crystal cellulose magnetic particles are wrapped in the microcapsules to obtain the nano-crystal cellulose magnetic particle absorbing agent. The method has the characteristics of being wide in raw material and low in cost, and the prepared absorbing agent achieves environmental friendliness, is free of pollution, can be used for absorbing various kinds of heavy metal like plumbum, chromium and copper in sewage, is large in absorbing capacity and good in effect and also has regenerating capacity.

Description

technical field [0001] The invention relates to the field of nanocrystalline cellulose composite materials, in particular to a method for absorbing heavy metals in solution by carboxylated nanocrystalline cellulose magnetic particles used for adsorbing heavy metal ions in sewage. Background technique [0002] With the development of modern economy and the development and utilization of marine resources in the offshore area, a large amount of waste water and domestic sewage containing heavy metal ions are discharged into the sea, the heavy metal pollution in marine water has increased sharply, and the ecological environment has also suffered great damage. Heavy metal ions can be enriched and accumulated through the food chain. A large number of studies have shown that the heavy metal content of fish in seawater has seriously exceeded the standard. [0003] Heavy metals have certain toxicity. For example, cadmium, when the environment is polluted, cadmium can enter the human ...

AI Technical Summary

Problems solved by technology

From the perspective of the microstructure of natural lignocellulose, its molecular arrangement is directional and has the characteristics of crystals (called cellulose crystallization regions). Lignocellulose is often formed by covalent bonds with other macromolecules in plant tissues. Lignin-carbohydrate complexes, these microstructures may affect the adsorption capacity and adsorption selectivity in two aspects: (1) the existence of crystallization regions limits the diffusion of metal ions in solution to the inside of lignocellulose adsorbent particles, and the crystallization (2) Due to the presence of lignin-carbohydrate complexes, the surface area, pore volume, average pore radius and pore size distribution of lignocellulose adsorbent particles are not in the same range. Appropriate range affects adsorption selectivity and adsorption capacity

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