纳米零价铁基复合材料的绿色制备与应用研究

Green preparation and application of nano zero-valent iron matrix composites

以硫酸亚铁为铁源,葡萄籽提取液为还原剂,活性炭为载体和分散剂,采用原位还原绿色制备了活性炭负载纳米零价铁复合材料(AC/nZVI)。利用SEM、EDS、XRD、FT-IR对制备的材料进行表征分析。最后,研究AC/nZVI对水中硝酸盐污染物的去除效率。结果表明,实验成功制备了平均直径为100nm的纳米零价铁,并且均匀分散在活性炭的表面及内部。AC/nZVI对硝酸盐去除结果显示,硝酸盐的去除符合准一级动力学,在pH为2,浴比为1∶50,硝酸盐初始浓度为100mg/L,反应30min后,对硝酸根的去除率可达99.98%。同时,对降解后的AC/nZVI进行回收再利用,重复降解10次后,在最优参数下对硝酸盐的去除率仍达到97.85%。以上结果表明,以葡萄籽提取液绿色制备的AC/nZVI在去除硝酸盐废水处理中具有充分的可行性和良好的应用前景。

Activated carbon supported nano zero-valent iron composites(AC/nZVI)were greenly prepared by in-situ reduction using ferrous sulfate as an iron source,grape seed extract as reducing agent and activated carbon as carrier and dispersant.The prepared materials were characterized by SEM,EDS,XRD and FT-IR.Finally,the removal efficiency of AC/nZVI on nitrate pollutants in water was studied.The results showed that nanometer zero-valent iron with tan average diameter of 100nm was successfully prepared,and evenly dispersed on the surface and inside the activated carbon.In addition,the results of nitrate removal by AC/nZVI showed that the removal of nitrate was in line with quasi-first-order kinetics.At a pH of 2,a bath ratio of 1∶50,an initial concentration of nitrate of 100mg/L,and a reaction time of 30min,the removal rate of nitrate could reach 99.98%.At the same time,the degraded AC/nZVI was recycled,and after repeated degradation 10 times,the removal rate of nitrate still reached 97.85%under the optimal parameters.The above results showed that AC/nZVI prepared with grape seed extract green had full feasibility and good application prospect in the treatment of nitrate-contaminated wastewater.