摘要
用苯甲醛对壳聚糖氨基进行保护形成了席夫碱（B-CTS）,B-CTS再与丁二酸酐（SAA）反应合成琥珀酰壳聚糖（SACTS）。采用FTIR、1HNMR、XRD、环境扫描电镜图（ESEM）对SACTS的结构和形貌进行表征。探讨了缚酸剂用量、丁二酸酐用量、反应时间、反应温度对SACTS羧基含量和酯化率的影响。得到SACTS较优的合成工艺条件为：m（B-CTS）∶m（三乙胺）∶m（SAA）=1∶4∶5,反应时间6.5 h,反应温度65℃。在该工艺条件下,酯化率为71.13%,SACTS中的羧基含量为93.01%。用SACTS对配制的吡罗红染料废水进行絮凝,考察了p H、初始浊度、温度对絮凝效果的影响,得到最佳絮凝条件为：p H=1-4,投加量1-10 mg/L,初始浊度200-800 NTU,温度20-30℃,在该条件下,絮凝后上清液浊度去除率均达95%以上,吡罗红染料残余率低于10%。对上清液Zeta电位和絮体XPS谱图分析表明,SACTS对吡罗红染料废水的絮凝是通过电中和与吸附架桥共同作用实现的。
Benzaldehyde was used to protect the amino group of chitosan to produce Schiff base（BCTS）.Then,B-CTS reacted with succinic anhydride（SAA） to synthesize succinyl-chitosan（SACTS）.The structure and morphology of SACTS were characterized by FTIR,-1HNMR,XRD and environmental scanning electron microscopy（ESEM）.The effects of the amount of acid acceptor,the amount of succinic anhydride,the reaction time and the reaction temperature on the carboxyl content and esterification rate of SACTS were discussed.The results showed that the optimum conditions were as follows： m（B-CTS） ∶ m（triethylamine） ∶ m（SAA） = 1 ∶ 4 ∶ 5,reaction time of 6.5 h and reaction temperature of 65 ℃.Under these conditions,the carboxyl content and esterification rate of SACTS were 93.01% and 71.13%,respectively.The flocculation performance of SACTS for the prepared pyronine wastewater was investigated.The influences of p H,initial turbidity and temperature on the flocculation effect were studied.The results demonstrated that when the p H was between 1 and 4,the dosage of SACTS was in the range of 1 mg/L to 10 mg/L,the initial turbidity was from 200 NTU to 800 NTU,and the temperature was from 20 ℃ to 30 ℃,the turbidity removal rate of supernatant was more than 95%,and the residual rate of pyronine was less than 10%.The Zeta potential of the supernatant and the XPS spectra of the flocculation indicated that the flocculation of SACTS for pyronine wastewater was achieved by the interaction of charge neutralization and adsorption bridging.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2018年第3期474-481,共8页
Fine Chemicals
基金
陕西省教育厅服务地方专项计划项目(15JF011)
陕西省工业科技攻关项目(2016GY-146)~~
关键词
琥珀酰壳聚糖
氨基保护
絮凝
吡罗红
水处理技术
succinyl-chitosan
amino protection
flocculation
pyronine
water treatment technology
