环境污染日益严重，含重金属离子的工业废水对环境和人体健康带来了严重的危

Environmental pollution is becoming more and more serious, and industrial wastewater containing heavy metal ions has brought serious harm to the environment and human health. Starch is an organic natural high-molecular flocculant, its price is low, it exists widely, and it has good biodegradability, non-toxic, and will not cause pollution to the environment. Compared with natural starch, the particle shape of modified starch is not different, but the size is slightly changed and has many advantages. <br>In this paper, basic sodium chloride and sodium hypophosphite are mainly used as modifiers, and chitosan, kaolin, activated carbon, etc. are used as coagulants. Ultrasound is used to modify corn starch to make modified starch flocculation. Agent. <br>The modified starch flocculant was prepared under the same conditions to change the type of flocculant, the dosage of sodium hydroxide, the dosage of modified starch flocculant, the adsorption time and the concentration of Cd2 + to study the adsorption of Cd2 + solution. <br>The results show that under the same conditions, sodium hypophosphite starch-activated carbon has a better effect than other types of modified starch flocculants. As the dosage of sodium hydroxide increases, the adsorption effect first increases and then decreases; as the dosage of modified starch flocculant increases, the adsorption effect gradually decreases; as the adsorption time increases, the adsorption effect increases first and then Decrease; as the concentration of Cd2 + increases, the adsorption effect increases first and then decreases; the dosage of sodium hydroxide is 1.2ml, the dosage of modified starch flocculant is 60mg, the adsorption time is 40 minutes, and the concentration of Cd2 + is 0.5mg / ml at suitable conditions, the adsorption capacity of modified starch flocculant is higher.

环境污染日益严重，含重金属离子的工业废水对环境和人体健康带来了严重的危害。淀粉是有机天然高分子絮凝剂，其价格低廉，存在广泛，且生物降解性良好，无毒，不会对环境造成污染。与天然淀粉相比，改性淀粉的颗粒形状没有差别，只是大小有些变化并且有许多优点。<br>本文主要选用碱性氯化钠和次亚磷酸钠为主改性剂，并以壳聚糖、高岭土、活性炭等为助凝剂，借用超声波辅助对玉米淀粉进行改性，制成改性淀粉絮凝剂。<br>将所制成的改性淀粉絮凝剂，在相同条件下改变絮凝剂种类、氢氧化钠投加量、改性淀粉絮凝剂投加量、吸附时间和Cd2+浓度对Cd2+溶液进行吸附研究。<br>研究结果表明，在相同条件下，与其他种类的改性淀粉絮凝剂相比次亚磷酸钠淀粉-活性炭有较好效果。随着氢氧化钠投加量的增加，吸附效果先升高后降低；随着改性淀粉絮凝剂投加量的增加，吸附效果逐渐降低；随着吸附时间的增加，吸附效果先升高后降低；随着Cd2+浓度的增加，吸附效果先升高后降低；在氢氧化钠投加量为1.2ml、改性淀粉絮凝剂投加量为60mg、吸附时间为40分钟、Cd2+浓度为0.5mg/ml时适宜条件下，改性淀粉絮凝剂的吸附量较高。

Environmental pollution is becoming more and more serious. Industrial wastewater containing heavy metal ions has brought serious harm to the environment and human health. Starch is a kind of organic natural polymer flocculant, which has the advantages of low price, wide existence, good biodegradability, non toxicity and no pollution to the environment. Compared with natural starch, the particle shape of modified starch has no difference, but its size has some changes and many advantages.<br>In this paper, basic sodium chloride and sodium hypophosphite were used as modifiers, chitosan, kaolin and activated carbon were used as coagulants, and corn starch was modified by ultrasonic wave.<br>Under the same conditions, the type of flocculant, the dosage of sodium hydroxide, the dosage of modified starch flocculant, the adsorption time and the concentration of Cd2 + were changed to study the adsorption of Cd2 + solution.<br>The results show that under the same conditions, compared with other kinds of modified starch flocculants, sodium hypophosphite starch activated carbon has better effect. With the increase of sodium hydroxide dosage, the adsorption effect first increased and then decreased; with the increase of modified starch flocculant dosage, the adsorption effect gradually decreased; with the increase of adsorption time, the adsorption effect first increased and then decreased; with the increase of Cd2 + concentration, the adsorption effect first increased and then decreased; with the increase of sodium hydroxide dosage of 1.2ml, modified starch flocculant dosage of 60mg, absorption The adsorption capacity of the modified starch flocculant was higher when the attachment time was 40 minutes and the concentration of Cd2 + was 0.5mg/ml.