摘要
以壳聚糖(CTS)、丙烯酸(AA)为单体,以过硫酸铵(APS)为引发剂,在体积分数为2%的冰醋酸水溶液中共聚,制备了N-羧乙基化壳聚糖(CEC)。采用红外光谱、核磁共振光谱等对壳聚糖衍生物CEC进行了表征。以阻垢性能为评判标准,通过单因素实验筛选出CEC的最佳合成条件为:m(AA)∶m(CTS)=5.30∶3.00,反应温度为75℃,反应时间为4 h,引发剂APS用量为3%(以单体总质量为基准,下同)。考察了CEC用于二级市政废水中的阻垢性能,结果表明,在经过二级处理的市政废水中,CEC阻CaCO3垢性能优异,当CEC的加药量为30 mg/L时,对CaCO3的阻垢率可达92.93%,明显优于市售阻垢剂羟基乙叉二膦酸(HEDP)。通过SEM、XRD对CEC阻CaCO3机理进行了初步探究,结果表明,CEC对CaCO3的作用机理主要是晶格畸变作用。
A new N-carboxylated chitosan(CEC) was synthesized by copolymerization of chitosan(CTS) and acrylic acid(AA) using ammonium persulfate(APS) as initiator in the presence of 2%(volume fraction) glacial acetic acid solution.The product was characterized by FTIR and 1 HNMR.According to scale inhibition performance,the synthesis conditions for CEC were optimized by single factor experiment.The optimal conditions were obtained as followed:the mass ratio of AA to CTS was 5.30∶3.00,the reaction temperature was 75 ℃,the reaction time was 4 h and the dosage of APS was 3%(based on the total mass of monomer,as the below).Then,the scale inhibition performance of CEC for secondary municipal wastewater treatment was studied.The results presented that the synthetic CEC exhibited excellent inhibition performance to CaCO3 and the scale inhibition rate could reach 92.93% in the presence of 30 mg/L of CEC,which was significantly better than commercially available scale inhibitor 1-hydroxyethylidene-1,1-diphosphonic acid(HEDP).The mechanism of CEC inhibiting CaCO3 was investigated by SEM and XRD.The results revealed that the mechanism of CEC on CaCO3 was mainly caused by lattice distortion.
作者
郑玉轩
高玉华
张利辉
刘振法
ZHENG Yu-xuan;GAO Yu-hua;ZHANG Li-hui;LIU Zhen-fa(School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China;Institute of Energy Sources,Hebei Academy of Sciences,Shijiazhuang 050081,Hebei,China;Hebei Engineering Research Center for Water Saving in Industry,Shijiazhuang 050081,Hebei,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2019年第1期149-155,162,共8页
Fine Chemicals
基金
国家自然科学基金项目(21376062)
河北省科技计划项目(17393604D)
河北省基础研究计划项目(18964005D)~~
关键词
市政废水回用
N-羧乙基化壳聚糖
阻垢性能
阻垢机理
水处理技术
municipal wastewater reuse
N-carboxyethyl chitosan
scale inhibition performance
scale inhibition mechanism
water treatment technology
