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

我们研究了利用高梯度超导磁分离与磁性吸附剂的高级水净化的可能性。我们开发了用于腐植酸等有机物的磁性介孔活性炭MMPC，用于氨氮的氧化磁性活性炭OxMAC，以及用于氨氮的磁性沸石MZL。通过热处理扩大微孔，MMPC能够有效地吸附腐殖酸。由于Ox-MAC表面固定有酸性官能团，可从0.8mg/L的氯化铵溶液中吸附80%左右的氨氮。由于吸附的腐殖酸和氨氮在低温下容易在大气中受热释放。MZL还能通过Na离子交换有效地吸附氨氮。在2 T以下的低磁场和1 m/s的高速流动条件下，高梯度SMS可以从溶液中收集99.95%的具有大磁化强度的MMPC。

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.