Preparation method of cross-linked type AM/AA (acrylamide/acrylic acid) grafted xanthogenic acid esterified cassava starch microsphere and adsorption of cross-linked type AM/AA grafted xanthogenic acid esterified cassava starch microsphere to Cu<2+>

Abstract

The invention discloses a preparation method of a cross-linked type AM / AA (acrylamide / acrylic acid) grafted xanthogenic acid esterified cassava starch microsphere and adsorption application of the cross-linked type AM / AAgrafted xanthogenic acid esterified cassava starch microsphere to Cu<2+>. The preparation method of the cross-linked type AM / AA grafted xanthogenic acid esterified cassava starch microsphere comprises the following steps: firstly preparing cross-linked AM / AA grafted xanthogenic acid esterified cassava starch, and then carrying out processing steps, namely emulsion dispersion, separation, washing, drying and the like by adopting a reversed-phase microemulsion method under the alkali condition while Span-80 is taken as an emulsifying agent, so that the cross-linked type AM / AA grafted xanthogenic acid esterified cassava starch microsphere with a regular shape, uniform granularity, good inner pore development and good adsorption property is obtained. A Cu<2+> adsorption performance test shows that the adsorption capacity of the cross-linked type AM / AA grafted xanthogenic acid esterified cassava starch microsphere reaches up to 20.18mg / g, and the Cu<2+> removal rate can reach up to 84.08%. The preparation method of the cross-linked type AM / AA grafted xanthogenic acid esterified cassava starch microsphere has the advantages that modified cassava starch is compounded in multiple steps in reverse-phased emulsion to prepare the starch microsphere, so that the prepared starch microsphere is in a good spatial reticular structure, the specific area is increased, and the Cu<2+> adsorption performance is excellent. Therefore, the starch microsphere has great application values in the aspects of industrial sewage purification, heavy metal adsorption and the like.

Description

technical field [0001] The invention relates to a preparation method of cross-linked AM / AA grafted xanthate-esterified cassava starch microspheres and its application in copper ion adsorption. Background technique [0002] With the current development of industry, the problem of heavy metal ion water pollution has been widely concerned by the society. Traditional wastewater treatment mainly uses methods such as neutralization precipitation, sulfide precipitation, adsorption resin, and activated carbon adsorption, but these methods are generally costly. , if not handled properly, it may cause secondary pollution. Insoluble starch xanthate is a kind of modified starch derivative obtained by xanthation after natural starch cross-linking. It has a compact and deformable three-dimensional structure, which is helpful for the flocculation and precipitation of heavy metals. ion exchange flocculants. At present, the research on insoluble starch xanthate derivatives at home and abro...

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Problems solved by technology

At present, the research on insoluble starch xanthate derivatives at home and abroad is mainly aimed at the optimization of the preparation process and the treatment of simulated industrial heavy metal wastewater. There are also studies on the preparation of thioaminostarch xanthate, soluble Starch-based xanthate-polyacrylamide graft copolymer, etc., but the corresponding products have a low removal rate of heavy metal ions and are difficult to recycle

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