掺镍ZnFe_(2)O_(4)复合材料的制备及其除藻性能

Preparation of nickel-doped ZnFe_(2)O_(4)composites and their algal removal properties

水体富营养化导致的有害藻华(HABs)爆发日益严重,对水环境和人类健康构成了巨大的威胁。本文采用简单的水热法制备了磁性可回收的镍掺杂ZnFe_(2)O_(4)(Ni-ZFO)吸附剂,用于去除水体中的铜绿微囊藻。通过SEM、XRD、EDS、XPS和振动样品磁力计(VSM)对材料进行了表征。在30 min内,Ni-ZFO复合材料的藻细胞去除率最高可达99.09%,在25℃、p H=3~8的条件下,去除率保持在90.41%以上。此外,Ni-ZFO的饱和磁化强度为67.93 emu/g,比ZnFe_(2)O_(4)(ZFO)高10.74 emu/g,便于回收利用。吸附过程中藻胆蛋白含量并未增加,藻细胞在吸附过程中不会破裂,这就避免了藻毒素进入水环境而造成的二次污染。经过4次循环使用后除藻率仍保持在75%以上。本文合成的Ni-ZFO吸附剂对藻细胞具有较强的去除效率,且不会造成二次污染,在缓解水体富营养化的实际应用中显示出巨大的潜力,同时也充实了改性ZFO在吸附领域的应用。

Harmful algal blooms(HABs)outbreaks due to eutrophication of water bodies are becoming increasingly serious,posing a great threat to the water environment and human health.In this paper,magnetic and recoverable nickel-doped ZnFe_(2)O_(4)(Ni-ZFO)adsorbents were prepared by a simple hydrothermal method for the removal of microcystis aeruginosa from water bodies.The materials were characterized by SEM,XRD,EDS,XPS and vibrating sample magnetometer(VSM).The algal cell removal of Ni-ZFO composites was up to 99.09%within 30 min and remained above 90.41%at 25℃and pH=3-8.In addition,the saturation magnetization intensity of Ni-ZFO was 67.93 emu/g,which was 10.74 emu/g higher than that of ZnFe_(2)O_(4)(ZFO),and it was easy to be recycled.The content of algal bile proteins did not increase in the adsorption process,and the algal cells would not be ruptured during the adsorption process,which avoids the secondary pollution caused by Microcystins entering the water environment.The algal removal rate remained above 75%after four times of recycling.The Ni-ZFO adsorbent synthesized in this paper has strong removal efficiency for algal cells and does not cause secondary pollution,which shows great potential in the practical application of mitigating eutrophication of water bodies,and also enriches the application of modified ZFO in the field of adsorption.