Magnetic porous bentonite chitosan composite microsphere and preparation method thereof

Abstract

The invention discloses a magnetic porous bentonite chitosan composite microsphere. The magnetic porous bentonite chitosan composite microsphere is characterized by being prepared from the following raw materials in parts by weight: 1-10 parts of bentonite, 1-5 parts of acetic acid, 1-3 parts of chitosan, 1-6 parts of ferric chloride hexahydrate, 1-3 parts of ferrous chloride tetrahydrate, 10-15 parts of sodium hydroxide, 5-10 parts of sodium citrate and 200-250 parts of water. High-porosity chitosan hydrogel microsphere is modified and led into a magnetic medium, and bentonite is loaded intothe microsphere to successfully prepare the magnetic porous bentonite chitosan composite microsphere with relatively strong cesium-ion adsorption ability and ability of utilizing a magnetic technologyto recycle. The magnetic porous bentonite chitosan composite microsphere has the characteristics of being high in adsorption rate, great in adsorption capacity, insensitive to pH and wide in scope ofapplication; and the magnetic porous bentonite chitosan composite microsphere can be gathered through external magnetic fields, solid-solution separation is easily realized, and recycling is convenient; and the whole preparation process is simple, operation time is short, and control is easy.

Description

technical field [0001] The invention relates to the technical field of radioactive waste treatment and environmental protection in nuclear waste, in particular to a magnetic porous bentonite-chitosan composite microsphere and a preparation method thereof. Background technique [0002] The use of nuclear energy inevitably produces radioactive waste water. The treatment of radioactive waste water has always been a hot topic and difficult problem in the research of various countries, and it is an important issue that must be properly solved in the use of nuclear energy. The radioactive element cesium is used as a radioactive source, and its radioactive half-life is as long as 30.28 years. Cesium has the characteristics of high solubility and strong mobility, so that it can easily exist in terrestrial and aquatic organisms. In addition, cesium ions can enter and accumulate in the human body through water and food chains, and are enriched in human muscle tissue, making it diffic...

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Problems solved by technology

[0007] The existing technology represented by the above-mentioned patent documents has complicated preparation process, long operation time and difficult control. Although the prepared bentonite chitosan has certain adsorption properties, it is difficult to separate and not easy to recycle after the adsorption is completed.

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