海藻酸钙包覆绿色合成纳米铁类Fenton降解柴油

Fenton-like oxidation of diesel in aqueous solution using calcium alginate-coated green synthesized iron nanoparticles

以海藻酸钙(CA)为包覆剂,利用桉树叶提取液(ELE)绿色合成了包覆型纳米铁材料(CA-ELE-Fe NPs)。在实验条件下反应240 min后,CA-ELE-Fe NPs类Fenton反应对柴油的去除率达到74.70%,而CA-ELE-Fe NPs、H_2O_2对柴油的去除率分别为13.19%,10.15%,说明CA-ELE-Fe NPs具有一定的吸附功能,以CA-ELE-Fe NPs为催化剂的类Fenton具有很强的氧化性能。通过扫描电子显微镜(SEM)、X射线能量色散谱分析(EDS)、傅里叶变换红外光谱(FT-IR)等表征分析手段证明纳米铁系颗粒的合成。最后,对比CA-ELE-Fe NPs、绿色合成纳米铁系颗粒(ELE-Fe NPs)和商品化纳米铁(nZVI)对实际含油废水的类Fenton去除效果,其降解率分别为80.24%,82.47%,44.36%。反应后CA-ELE-Fe NPs仍可回收利用,海藻酸钙的包覆降低了纳米铁系材料铁的浸出率。重复使用后油去除率仍达67.46%。

The coated iron nanoparticles（CA-ELE-Fe NPs）were synthesized using eucalyptus leaves extract and calcium alginate（CA）.The results showed that 74.7% of diesel was removed using CA-ELE-Fe and H2 O2,while only 13.19%and 10.15%of diesel oil were removed by CA-ELE-Fe and H2 O2 after 240 min,respectively,which demonstrated that CA-ELE-Fe NPs exhibit a good adsorption ability and act as excellent Fenton-like catalyst.Scanning electron microscopy（SEM）,X-ray energy dispersive spectroscopy（EDS）and Fourier transform infrared spectroscopy（FT-IR）confirmed the successful synthesis of iron nanoparticles and indicated the changes in CA-ELE-Fe NPs before and after reaction with oil.Various materials were applied to treat practical oil wastewater,which showed that 80.24%,82.47%and 44.36%of diesel was removed by CA-ELE-Fe NPs,green synthetic nano particles（ELE-Fe NPs）and zero-valent iron nanoparticles（nZVI）,respectively.Meanwhile,diesel removal efficiency reached 67.46% by used CA-ELE-Fe NPs,because the coating of calcium alginate reduced the iron nanoparticles releasing to liquid.