钴掺杂碳活化过硫酸氢钾降解四环素

Cobalt-Doped Carbon Activates Potassium Monopersulfate to Degrade Tetracycline

本文以无水葡萄糖和六水合硝酸钴为原料,采用水热法与原位负载相结合制备了一种掺钴的碳基化合物,并将其作为过硫酸氢钾活化剂用于催化降解水体中的四环素。对制备的掺钴碳基化合物进行了XRD、SEM、TEM、XPS等表征,从晶形结构、显微形貌、表面化学元素等方面分析了该催化剂降解四环素效果明显高于单一水热碳的原因。此外,考察了催化剂投加量、过硫酸氢钾投加量、溶液pH等因素对四环素催化降解效果的影响。实验结果表明:掺钴碳基化合物在最佳反应条件下催化降解60 min,四环素的降解率达到了95.84%(k=0.05136 min^(-1))。同时还对降解机理进行了探究,分析结果表明掺钴碳基材料中的Co^(0)和Co^(2+)参与了激活过硫酸氢钾产生·O_(2)^(-)、SO_(4)·-、^(1)O_(2)、·OH的过程,该材料具有高效的催化降解四环素的能力,在处理抗生素废水方面具有良好的前景。

In this paper,a cobalt-doped carbon-based compound was prepared from anhydrous glucose and cobalt nitrate hexahydrate by a combination of hydrothermal method and in situ loading,and applied as an activator of potassium monopersulfate(PMS)for catalytic degradation of tetracycline in water.The prepared cobalt-doped carbon-based compounds were characterized by XRD,SEM,TEM,XPS,etc.The reason why the degradation effect of tetracycline by this catalyst was significantly higher than that of a single hydrothermal carbon was analyzed from the aspects of crystal structure,microstructure,and surface chemical elements.In addition,the effects of catalyst dosage,PMS dosage,and solution pH on the catalytic degradation of tetracycline were investigated.The experimental results show that,under the optimal reaction conditions,the cobalt-doped carbon-based compounds catalyze the degradation of tetracycline for 60 min,the degradation rate of tetracycline reaches 95.84%(k=0.05136 min^(-1)).The degradation mechanism was also investigated,and the analysis results show that Co^(0)and Co^(2+)in the cobalt-doped carbon-based material are involved in the activation of potassium monopersulfate to produce·O_(2)-,SO_(4)·-,^(1)O_(2),·OH,and thus the materials have the ability to catalyze the degradation of tetracycline with high efficiency,which is promising for the treatment of antibiotic wastewater.