Method for producing oxide-chitosan composite material and oxide-chitosan composite material

Abstract

The invention discloses a method for producing an oxide-chitosan composite material and the oxide-chitosan composite material. The method for producing the oxide-chitosan composite material comprises the following steps: dissolving chitosan in polyhydroxy alcohol or lower alcohol to form a chitosan alcoholic solution, adding oxide powder and uniformly mixing the materials to obtain an oxide-chitosan-glycol mixing dispersion solution, heating the dispersion solution and filtering the dispersion solution, washing the material, and collecting the material to obtain a solid which is the oxide-chitosan composite material. The method directly uses magnesium oxide as the raw material, a defect that hydrolysis of the magnesium oxide powder in aqueous liquid is easily carried out and the magnesium hydroxide or magnesium carbonate intermediate product is generated, so that the magnesium oxide-chitosan composite material cannot be prepared is avoided, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the field of novel material preparation, and in particular relates to a method for preparing a nanometer oxide-chitosan composite material and the oxide-chitosan composite material. Background technique [0002] Chitosan, also known as chitosan, is the product obtained after deacetylation of chitin. Since the molecular chain contains reactive groups hydroxyl (-OH) and amino (-NH2), it can coordinate and chelate heavy metal ions through hydrogen bonds and ionic bonds. It is non-toxic, biodegradable, biocompatible, Bioadhesion and other advantages, is a very ideal biosorbent. However, because there are a large number of amino groups and hydroxyl groups in its molecular chains, hydrogen bonds are widely formed between molecular chains and inside molecular chains, thereby limiting its adsorption. And its chemical stability, thermal stability and mechanical strength all need to be improved. In order to improve its performance, it...

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Problems solved by technology

[0003] At present, there are reports that magnesium oxide and chitosan are directly mixed in acetic acid aqueous solution, and heated after adding alkali to precipitate to prepare magnesium oxide / chitosan composite material (Yuvaraj Haldorai, Jae-jin Shim, An efficient removal of methyl orange dye from aqueous solution by adsorption ontochitosan / MgO composite: A removal reusable adsorbent, Applied Surface Science, 292, 2014, 447-453). However, a careful analysis of the study reveals that magnesium oxide powder is easily dissolved and hydrated in acetic acid water , In addition, adding sodium hydroxide to the reaction solution to deposit magnesium oxide and chitosan to prepare magnesium oxide / chitosan composites, it is likely that the Mg dissolved in the acetic acid aqueous solution 2+ Combined with hydroxide to form magnesium hydroxide, thus preparing magnesium hydroxide / chitosan composites instead of magnesium oxide-chitosan composites

Similarly, scientists in India reported (C.Sairam Sundaram, Natrayasamy Viswanathan, S.Meenakshi, Defluridation of water using magnesia / Chitosan composite, Journal of Hazardous materials, 163, 2009, 618-624) the combination of magnesium oxide powder and shell The magnesium oxide / chitosan composite material is prepared by mixing the sugar aqueous solution, but since the magnesium oxide powder is hydrated in the aqueous solution, it is easy to interact with water and carbon dioxide dissolved in water to form magnesium hydroxide or magnesium carbonate, which requires further processing. Heat treatment, but the pyrolysis temperature of chitosan and magnesium hydroxide conflict

Therefore, it is difficult to prepare MgO / chitosan composites

None of these reports elaborated on the preparation conditions of magnesium oxide / chitosan composites, and the preparation process was relatively complicated.

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