摘要
以丙烯酰胺(AM)、丙烯酰氧乙基三甲基氯化铵(DAC)为主要单体,采用半干法合成两性淀粉基絮凝剂,对其工艺进行讨论,并对其絮凝性能进行研究.考察了磷酸盐质量分数、pH、尿素质量分数、反应温度、反应时间对磷酸化反应的影响,研究了溶液初始 pH、吸附时间、初始质量浓度等因素对吸附性能的影响.通过扫描电子显微镜(SEM)、傅里叶红外光谱仪(FTIR)、氢核磁共振仪(1H NMR)和 X 射线衍射仪(XRD)等多种表征手段观察改性样品形貌以及分析其官能团、结构和组织.实验得到最佳合成工艺为:磷酸盐质量分数 30%、反应体系pH=7、尿素质量分数 20%、反应温度 130℃、反应时间 150 min.结果表明:当pH=5、吸附时间为90 min、Cu2+初始质量浓度为250 mg·L-1 时,两性淀粉基絮凝剂性能最好,吸附过程遵循二级动力学模型,具有一定的耐酸碱性、抗盐、抗剪切性.
Abstract
Amphoteric starch based flocculant was synthesized by semi-dry method with acrylamide(AM),acrylylloxyethyltrimethyl ammonium chloride(DAC)and cerium ammonium nitrate as monomers.The process and flocculation performance of amphoteric starch based flocculant were discussed.The effects of phosphate mass fraction,pH,urea mass fraction,reaction temperature and reaction time on phosphorylation were investigated.The effects of initial pH,adsorption time and initial mass concentration on adsorption properties were studied.The modified samples were characterized by scanning electron microscopy(SEM),Fourier infrared spectrometer(FT-IR),hydrogen nuclear magnetic resonance(1HNMR)and X-ray diffractometer(XRD)to observe theirmorphology,functional groups and structure.The optimum synthesis process was as follows:phosphate mass fraction 30%,reaction system pH=7,urea mass fraction 20%,reaction temperature 130℃,reaction time 150 min.The results showed that when pH=5,adsorption time was 90 min,and initial mass concentration of Cu2+was 250 mg·L-1,amphoteryl starch based flocculant had the best performance.The adsorption process followed the second-order kinetic model and had certain acid-alkali resistance,salt resistance and shear resistance.
维普
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