氮氯共掺杂多孔碳活化过一硫酸盐降解苯酚的性能及机理研究

杂原子共掺杂碳材料在过硫酸盐活化领域具有广阔的应用前景. 本工作通过两步煅烧法合成了氮氯共掺杂ZIF-8衍生多孔碳材料(NClC), 并以苯酚为目标污染物, 考察其活化过一硫酸盐(PMS)的催化性能, 结果表明, 30 min内, 0.04 g/L NClC900活化0.3 g/L PMS可去除水中97.7%的苯酚(50 mg/L), 且总有机碳去除率可达72.4%; NClC900/PMS体系具备优异的酸碱耐受性(pH=3~9)和抗干扰能力, 无机阴离子和腐植酸对其影响较小, 且该体系还可有效去除水中的染料、抗生素、酚类及农药等有机污染物; 循环实验结果表明, NClC900在重复使用4次后其苯酚去除率可达72.1%; 猝灭实验、电子顺磁共振和电化学分析表明¹O₂和表面结合SO₄^•-是导致苯酚降解的主要活性物种, 而NClC900中的石墨N、C—Cl是产生¹O₂和表面结合SO₄^•-的关键活性位点.     

Surface Changes of Ochrobactrum Anthropi in Cr（Ⅵ） Treatment for 1 Hour

Bioremediation has been a considerable method for treating Cr（VI） contamination. Bacterial surface changes of Ochrobactrum anthropi during Cr biosorption was investigated in this study. We found that Cr adsorption capacity increased with the increase of initial Cr（Ⅵ） concentration. Atomic force microscope （AFM） morphologic analysis combined with surface roughness analysis indicated that the bacterial surfaces became rougher during Cr uptake process. X-ray photoelectron spectroscopy （XPS） showed that Cr（Ⅲ） was adsorbed on the bacterial surfaces. Fourier transform infrared （FT-IR） analysis showed that surface functional groups including C-O and C-N might be involved in the Cr biosorption process.