铋/炭纳米粒子的合成及其催化还原对硝基苯酚

Synthesis of Bi/C Nanohybrid and its Catalytic Activity for the Reduction of 4-nitrophenol

以纳米炭球为载体,采用一步液相还原法合成Bi/C纳米催化材料,并利用XRD、EDX、XPS、SEM和TEM对产物的物相、组成、形貌和元素化学态进行详细表征。结果表明:通过该方法成功合成粒径为3-5 nm的金属Bi纳米粒子,该纳米粒子均匀地负载在纳米炭球表面上,无明显团聚现象。所得到的Bi/C纳米复合粒子对硼氢化钠还原对硝基苯酚(4-NP)具有明显的催化活性;当Bi负载量为26.5 wt.%时,该反应在室温下的反应速率常数可达到0.204min-1;通过阿仑尼乌斯方程得到的表观活化能为39 k J·mol-1。与常见的贵金属催化剂相比,该Bi/C纳米复合粒子具有价格低廉、合成简单以及活性较高的优点。

In this work, Bi/C nanohybrids were synthesized via a solution-phase synthesis using nanosized carbon spheres as supports.The resultant Bi/C nanohybrids were characterized using XRD, EDX, SEM and TEM, respectively.The results show Bi nanoparticles has a size of 5 nm and are uniformly deposited on the carbon nanospheres, not showing any aggregation.Such nanohybrids exhibit a promising catalytic activity towards the reduction of 4-nitrophenol by sodium borohydride and show a high rate constants of 0.204 min-1 when Bi has a 26.5 wt% loading.The activation energy is estimated to be 39 k J·mol-1 based on the Arrhenius equation.Compared to the common noble metals, such Bi/C nanohybrids have the advantages of cost-effectiveness, facile synthesis and promising activity.