MBA交联羧甲基淀粉的制备及其絮凝性能研究

Preparation and Flocculation Properties of MBA Cross-linked Carboxymethyl Starch

以木薯淀粉为原料,N,N′-亚甲基双丙烯酰胺(N,N′-Methylene-Bisacrylamide,MBA)为交联剂,采用“一步法”合成了交联羧甲基淀粉(CCMS)。研究了MBA用量、交联反应时间与CCMS黏度之间的关系,考察了CCMS的耐酸碱性能和耐剪切性能。利用FT-IR、SEM对产物结构进行了表征分析。结果表明,CCMS具有独特的聚集鳞片、断裂、凹陷和网状的形貌结构,黏度高,耐酸碱性能和耐剪切性能优良。以高岭土悬浮液为模拟水样,CCMS为絮凝剂,考察了CCMS添加量、模拟水样pH及絮凝时间对絮凝效果的影响。结果表明,在中性和酸性条件下,CCMS具有较好的絮凝效果,当模拟水样质量浓度为1g·L^(-1)、pH=5、CCMS质量浓度为20mg·L^(-1)、絮凝时间为120min时,水样的透光率可达84.0%,高岭土去除率可达97.1%。

Cross-linked carboxymethyl starch(CCMS)was prepared by one-step method using cassava starch as raw material and N,N’-methylene-bisacrylamide(MBA)as crosslinking agent.The relationship between the amount of MBA,the reaction time of crosslinking and the viscosity of CCMS was studied.The acid and alkali resistance and shear resistance of CCMS were also studied.The structure of the product was characterized by FT-IR and SEM.The results showed that CCMS had unique aggregated scale,fracture,sunken and reticular morphology,and CCMS had high viscosity,excellent acid and alkali resistance and shear resistance.Taking kaolin suspension as simulated water sample and CCMS as flocculant,the effects of CCMS dosage,pH of simulated water sample and flocculation time on the flocculation effect were studied.The results showed that CCMS had good flocculation effect under neutral and acidic conditions.When the mass concentration of simulated water sample was 1g/L,pH was 5,CCMS mass concentration was 20 mg/L,and flocculation time was 120 min,the light transmittance of the water sample was 84.0%,and the removal rate of kaolin was 97.1%.