以无水柠檬酸、L-赖氨酸为主要原料,通过熔融缩聚法合成了一种纯柠檬酸(CCQDs)衍生物Ly-CCQDs,通过红外光谱分析仪、紫外-可见分光光度计等对其进行表征,在40~80℃条件下对Ly-CCQDs进行了阻垢静态测试。结果表明,在极少量Ly-CCQDs加入的条件下,阻硫酸钙和碳酸钙垢的阻垢率均可达到100%,与单一的无水柠檬酸相比有明显的改善。通过SEM对Ly-CCQDs的阻垢机制进行研究发现,随着Ly-CCQDs加入量的增大,碳酸钙垢的晶型逐渐由方解石向尺寸更小的霰石结构发展,证明Ly-CCQDs对钙垢生长有显著的抑制作用。

Ly-CCQDs,a CCQDs derivative,is synthesized via the melt polycondensation method with anhydrous citric acid and L-lysine as main raw materials,and characterized by means of infrared spectrometer,ultraviolet-visible spectrophotometer,etc.The scale inhibition static test to Ly-CCQDs is carried out at 40-80℃.It is shown that the scale inhibition rates of Ly-CCQDs against calcium sulfate and calcium carbonate scale both reach 100% under a very small addition amount of CCQDs,showing a significant improvement than that of anhydrous citric acid alone.The scale inhibition mechanism of Ly-CCQDs is studied through SEM,and it is found that the crystal form of calcium carbonate scale changes with the increasing addition amount of Ly-CCQDs,and gradually develops from calcite to smaller aragonite structure,proving that Ly-CCQDs has a significant inhibitory effect on the growth of calcium scale.

李辉(1997-),男,硕士生,研究方向为绿色阻垢剂和碳量子点,huili142857@163.com;荆国林(1969-),男,博士,教授,博士生导师,研究方向为水污染控制工程,通讯联系人,jglxueshu@yeah.net。