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Preparation method and application of titanium dioxide/chitosan/oxidized graphene composite material

A technology of titanium dioxide and composite materials, applied in the fields of alkali metal oxides/hydroxides, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of difficult solid-liquid separation, poor stability of chitosan, and small titanium dioxide particles and other issues, to achieve good practical application value and industrial prospects, increase the removal rate, and achieve the effect of good removal effect

Inactive Publication Date: 2014-01-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chitosan is considered to be a good organic biosorbent, non-toxic and harmless, and has a wide range of sources, but the stability of chitosan is not strong, thus limiting its further application; the photocatalytic oxidation of trivalent arsenic by titanium dioxide High efficiency, good adsorption effect, strong stability, but small particles of titanium dioxide, poor mechanical strength, difficult to achieve solid-liquid separation, thus limiting its direct application as an adsorbent; graphene due to its excellent physical and chemical properties, in various The field has received extensive attention, in which graphene's huge specific surface area and excellent mechanical strength can be used in the development of adsorption materials, but because graphene oxide is hydrophilic, it is easy to agglomerate in solution, which also limits its application. range; so it is an ideal solution to combine the excellent properties of various materials into composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) The preparation of a titanium dioxide-chitosan-graphite oxide composite material comprises the following steps:

[0015] a, the preparation of graphite oxide

[0016] Add 1.5g of graphite powder to the 2 SO 4 / H 3 PO 4 Put the system in a 180ml / 20ml beaker, put the system in an ice-water bath, add 9g of potassium permanganate, react for 0.5-1h, place it in a constant temperature water bath at 50°C and stir for 12 hours; after cooling the reactant to room temperature, add There is 3mL30%H 2 o 2 Put the filtrate in a high-speed centrifuge for centrifugation, take out and discard the supernatant; wash the filter residue with deionized water for 1-3 times and then centrifuge, and then filter the residue Wash with 5-10% hydrochloric acid, and then centrifuge for several times until the supernatant is clear and no sulfate ions can be detected, then wash with an organic solvent for 1-3 times and then centrifuge; the obtained product is dried in a freeze dryer.

[00...

Embodiment 2

[0022] The composite adsorption material of the present invention (abbreviated as TCG) and titanium dioxide / chitosan adsorption material (abbreviated as TC) without adding graphite oxide were subjected to the removal experiment of arsenic ions under the same conditions as in Example 1, and the measured effect of TCG product on AS The adsorption capacity of (Ⅲ) was 6256.3μg / g, and the adsorption capacity of TCG product on AS(Ⅴ) was 8149.2μg / g. The adsorption capacity of TC material to AS(Ⅲ) was 4082.7μg / g, and the adsorption capacity of TC material to AS(Ⅴ) was 5546.3μg / g.

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Abstract

The invention relates to a titanium dioxide / chitosan / oxidized graphene composite material. A preparation method for the titanium dioxide / chitosan / oxidized graphene composite material comprises the specific steps of dispersing graphite oxide into dilute acetic acid to prepare dispersion liquid, adding chitosan powder into the dispersion liquid, uniformly stirring the chitosan powder and the dispersion liquid, then adding titanium dioxide, continuing to stir the materials to form a glue solution; dropping the glue solution into a sodium hydroxide solution, stewing the solution for 4-12 hours, and washing the solution until the solution is neutral to obtain composite gel. The prepared material can be applied to treating heavy metal, namely arsenic, in wastewater and can be used repeatedly. The composite material preparation method disclosed by the invention is simple; the composite material has a good removal effect on arsenic, can separate solid and liquid easily, is simple, high in efficiency and environment-friendly and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of new environmental materials and water treatment, and in particular relates to a preparation method and application of a titanium dioxide / chitosan / graphene oxide composite material. Background technique [0002] Arsenic is a ubiquitous toxic substance, mainly anioned as an inorganic salt, such as arsenate (AsO 4 3- ) and arsenite (AsO 3 3- ) exists in natural water systems, and these two types of arsenic can enter the human body through inhalation, food or skin contact. If people drink or contact high-arsenic water for a long time, it will cause various diseases and cancers in the body. Due to natural and man-made reasons, many countries in the world have serious arsenic pollution problems. The latest reports show that drinking water in vast rural areas in northern my country has very serious arsenic pollution. Arsenic pollution is the reason why many places become "cancer villages". one of the main ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 杨春平罗肃霜罗胜联曾光明何慧军程燕涂燕红
Owner HUNAN UNIV
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