全球水污染严重,亟需开发有效技术净化水。4-硝基苯酚(4-NP)是常见的水污染物,可将其还原为制药原料4-氨基苯酚,在净化水的同时可以创造价值。过渡金属纳米粒子常用于催化还原反应,但其易聚集影响催化活性,将其负载到杂原子掺杂的多孔碳可稳定金属纳米颗粒,从而提高催化效率。采用一种简单而有效的策略,通过熔盐辅助法在空气中不需要使用精密的管式炉直接热解制备出氮氧掺杂的碳纳米片,将所获得的碳纳米片作为载体用于生长尺寸小且负载均匀的Co纳米粒子制备Co NPs/NOC催化剂,根据催化NaBH4还原4-NP反应的效果,得到最佳的制备条件为:草酸铵作为氮源,碳源与氮源的比例为1∶1,热解温度为700℃,钴盐的添加量为3mL。在此条件下制备的催化剂表观速率常数达到了0.00632s-1,且在第五次循环后仍能达到90%的转化率。
Water pollution is severe worldwide,and there is an urgent need to develop effective technologies for water purification.4-nitrophenol (4-NP)is a common pollutant that can be reduced to the pharmaceutical raw material 4-aminophenol,which can create value while purifying water.Transition metal nanoparticles are commonly used in catalytic reduction reactions,but their tendency to aggregate affects catalytic activity.Loading metal nanoparticles onto porous carbon materials doped with heteroatoms can stabilize metal nanoparticles and improve catalytic efficiency.In this work,a simple and effective strategy was employed to prepare nitrogen- and oxygen-doped carbon nanosheets by direct pyrolysis in air using a molten salt-assisted method without the need for a precision tube furnace.The obtained carbon nanosheets were used as carriers for the growth of small-sized and uniformly loaded Co nanoparticles to prepare catalysts Co NPs/NOC.The optimal preparation conditions for catalyzing the reduction of 4-NP with NaBH4 were found to be using ammonium oxalate as the nitrogen source,a 1∶1 ratio of carbon source to nitrogen source,pyrolysis temperature of 700℃,and cobalt salt addition of 3mL.The catalyst prepared under these conditions achieved an apparent rate constant of 0.00632s-1 and maintained a 90% conversion rate after five cycles.
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基金资助
中央高校基本科研业务费项目(31920240115、31920240084和31920190079)
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