Preparation of cationic taro starch flocculant with high-efficiency decolorization performance

Abstract

The invention relates to a cationic taro starch and a preparation method thereof, belonging to the field of environment-friendly material preparations. The preparation method for a flocculating agent,i.e., the cationic taro starch, comprises the following steps: cutting taro slices and soaking the taro slices in a NaOH solution with a pH value of 8-10, wherein a material-water ratio is 1: 1 to 1:5; performing homogenization, sieving, centrifugation, washing and drying successively so as to obtain taro starch; then spraying a solution containing NaOH and 2,3-epoxypropyltrimethylammonium chloride into the taro starch, wherein the usage amount of the NaOH accounts for 0.5-3 wt% of the usage amount of the taro starch, and the usage amount of the 2,3-epoxypropyltrimethylammonium chloride accounts for 12-20 wt% of the usage amount of the taro starch; and performing uniform mixing under stirring, allowing the water content of a formed system to be in a range of 20%-30%, and carrying out a reaction at 50-70 DEG C for 1-4 h. The preparation method of the invention is simple in process and low in cost; and the obtained cationic taro starch is environmentally friendly, non-toxic and easilydegradable, and has excellent decolorization effect, wherein decolorization effect on dyes can reach 95% or more.

Description

technical field [0001] The invention relates to a preparation method and application of a novel cationic taro starch flocculant with high-efficiency decolorization performance, and belongs to the technical field of environmental protection material preparations. Background technique [0002] With the development of science and technology, it is particularly important to develop a sustainable resource. Starch resources are abundant in nature. Since the glucose residues of starch have active hydroxyl groups, it can be prepared into an efficient natural polymer flocculant by etherification, esterification, cross-linking, graft copolymerization, etc. It has the advantages of wide sources, environmental friendliness, renewable and easy to decompose, so it is also the earliest developed natural polymer water treatment agent. [0003] Taro, commonly known as taro, is a species of Araceae and is extremely rich in resources. According to the report of the United Nations Agriculture ...

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Problems solved by technology

[0004] At present, the commonly used flocculants in the market are traditional polymers of aluminum salts and iron salts, such as polyaluminum chloride (PAC) and polyferric sulfate (PFS). Compared with organic polymer flocculants, they have narrow application range and large dosage , which is greatly affected by environmental conditions, large amount of sludge and other shortcomings, among which the residual accumulation of aluminum ions will cause symptoms such as senile dementia

However, artificially synthesized organic polymer flocculants such as polyacrylamide (PAM) have the disadvantages of being difficult to degrade, and the residual monomers after wastewater treatment are carcinogenic, teratogenic, and mutagenic.

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