Preparation method of cross-linked am/aa grafted xanthate tapioca starch microspheres and its effect on cu 2+ Adsorption
A technology of xanthate and tapioca starch, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of low removal rate of heavy metal ions, difficulty in recycling, etc. Achieving good spatial network structure, regular appearance, and solving the effect of low adsorption rate
Active Publication Date: 2017-12-12
GUILIN UNIVERSITY OF TECHNOLOGY
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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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[0026] (1) Dry the tapioca starch in a vacuum oven at 60° C. to constant weight to obtain dry base tapioca starch.
[0027] (2) Add 0.6g of sodium chloride, 0.04g of sodium hydroxide and 18mL of deionized water to a 50mL beaker in sequence, and stir to dissolve.
[0028] (3) Weigh 5 g of tapioca starch obtained in step (1) on a dry basis in a four-necked flask, slowly add the solution obtained in step (2) under stirring, then add 40 μL of analytically pure epichlorohydrin, and stir evenly; at a temperature of 45 ° C The crosslinking reaction was carried out for 0.5 hours.
[0029] (4) Adjust the pH of the system in step (3) to 7 with a hydrochloric acid solution with a concentration of 3.0 mol / L, and then suction filter after standing; wash twice with 20 mL of ethanol with a volume fraction of 95%, and suction filter to obtain a filter cake.
[0030] (5) Put the filter cake obtained in step (4) into a watch glass, place it in a vacuum drying oven at 50° C., and dry it to a co...
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Abstract
The invention discloses a preparation method of cross-linked AM / AA grafted xanthate-esterified cassava starch microspheres and its effect on Cu 2+ adsorption applications. Firstly, cross-linked AM / AA grafted xanthate-esterified tapioca starch was prepared, and then Span-80 was used as emulsifier. Under alkaline conditions, the inverse microemulsion method was used to emulsify and disperse, separate, wash, and dry. The process steps obtain a kind of cross-linked AM / AA grafted xanthate-esterified tapioca starch derivative microspheres with regular appearance, uniform particle size, developed internal pores and excellent adsorption performance. Adsorbed Cu 2+ The ion performance test shows that the adsorption capacity of the microsphere reaches 20.18mg / g, Cu 2+ The removal rate can reach 84.08%. In the present invention, multi-step composite modified cassava starch is made into starch microspheres in the reverse emulsion to make it have a good spatial network structure, which increases the specific surface area and is effective for Cu 2+ excellent adsorption properties. It shows high application value in industrial sewage purification and heavy metal adsorption.
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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IPC IPC(8): C08J3/16C08L51/02B01J20/26B01J20/30B01J20/28C02F1/28C02F1/62
Inventor 李和平杨旭武冠亚袁金伟张垚孙彦邹英东
Owner GUILIN UNIVERSITY OF TECHNOLOGY