Development of new water purification system by magnetic separation with magnetic activated carbon

我们研究了利用磁性吸附剂的高梯度超导磁分离HGSMS进行高级水净化的可能性。我们开发了用于腐植酸等有机质的磁性介孔活性炭MMPC，用于氨氮的氧化磁性活性炭OxMAC，用于氨氮的磁性沸石MZL。通过热处理扩大微孔，MMPC可以有效地吸收腐植酸。在0.8 mg/L氯化铵溶液中，由于氧- mac表面固定的酸官能团，可吸附约80%的氨氮。由于吸附的腐植酸和氨氮在大气中低温加热容易释放。MZL还能通过Na离子交换有效吸收氨氮。采用HGSMS技术，在1 m/s的高流速和2 T的低磁场条件下，溶液中MMPC的回收率为99.95%，且磁化强度较大。

We have studied the possibility of advanced water purification by using a high gradient superconducting magnetic separation HGSMS with magnetic adsorbents. We have developed magnetic mesoporous activated carbon MMPC for humic acid and other organic matters, oxidized magnetic activated carbon OxMAC for ammonia nitrogen, and magnetic zeolite MZL for ammonia nitrogen. By means of expanding micro-pores by heat treatment, the humic acid was able to be efficiently absorbed by MMPC. About 80 % of ammonia nitrogen can be adsorbed from 0.8 mg/L of ammonium chloride solution by Ox-MAC due to the acid functionalities fixed on the surface. Since the adsorbed humic acid and ammonia nitrogen were easily released by heating in atmosphere at low temperatures. MZL also effectively absorbed ammonia nitrogen by Na ion exchange. By using HGSMS, MMPC with a large magnetization can be collected from the solution by 99.95 % at a high speed flow velocity of 1 m/s and low magnetic fields under 2 T.