摘要：
采用羧甲基壳聚糖（O-CMC）与琥珀酸酐（SAA）反应合成N-琥珀酰-O-羧甲基壳聚糖（NSOCMCS），利用FTIR对产物进行结构表征，并探讨了m（O-CMC）：m（SAA）、反应温度及时间对产物的羧基质量分数影响，得到最佳合成条件：m（O-CMC）：m（SAA）=1：6，反应温度为50℃，反应时间为4 h，制得产物NSOCMCS的羧基质量分数为87.86%，同时釆用NSOCMCS对丁烯醛生产废水进行絮凝研究，以COD去除率为衡量指标，通过单因素与响应曲面优化试验确定最佳絮凝条件：絮凝剂投加量为600 mg/L，絮凝体系pH=8，温度为37℃，絮凝时间为2 h，测得废水中COD去除率为58.37%，另对上清液Zeta电位观察可知，NSOCMCS絮凝机理为电中和与吸附架桥共同作用。
关键词:
壳聚糖衍生物,
絮凝,
丁烯醛废水,
化学需氧量
Abstract:
O-Carboxymethyl chitosan(O-CMC) reacted with succinic anhydride(SAA) to synthesize N-succinyl-O-carboxymethyl chitosan(NSOCMC), then the product structure was characterized by FTIR. The effects of amounts of m(O-CMC):m(SAA), reaction time and temperature on the carboxyl content were discussed. The results showed that the optimum synthesis conditions were as follows:m(O-CMC):m(SAA)=1:6, reaction temperature of 50℃, and reaction time of 4 h. Under these conditions, the carboxyl content of NSOCMCS were 87.86%. Meanwhile, the flocculation performance of NSOCMCS for the crotonaldehyde wastewater was investigated by single factor and response surface optimization experiment using COD removal rate as measure index. The results showed that with the condition of pH 8, NSOCMCS dosage 600 mg/L, temperature 37℃ and the flocculation time 2 h, the COD removal rate of wastewater was 58.37%. The Zeta potential of the supernatant indicated that the flocculation of NSOCMCS for the crotonaldehyde wastewater was achieved by the interaction of charge neutralization and adsorption bridging.
Key words:
chitosan derivative,
flocculation,
crotonaldehyde wastewater,
chemical oxygen demand
中图分类号:
白立军. 壳聚糖衍生物絮凝剂对丁烯醛废水中COD的去除研究[J]. 工业水处理, 2020, 40(9): 65-69.
Lijun Bai. COD removal in crotonaldehyde wastewater by chitosan derivative flocculant[J]. Industrial Water Treatment, 2020, 40(9): 65-69.