高价离子 meaning in English

high valence ion

As a new separation membrane technology developed in recent years , nanofiltration ( nf ) membrane is the most appealing field of membrane science and technology compared with those traditional membranes , the advantages of nf membranes are as follows : having hole diameters of nanometers , low operation pressure , economic for it can replace many procedures in traditional process and separation technology , having high selectivity to different irons , and so on
纳滤膜是近十几年发展起来的一种新型的压力驱动膜，它所具有的特殊的纳米级孔径使其具有很多分离膜不具备的优点，如操作压力低、对二价和高价离子具有高的选择性、具有较好的压密性和较强的抗污染能力等。