Abstract: After dissolving bismuth nitrate into thiourea solution whose mass fraction is 10%,and mixing with activated carbon(AC) at 180℃ for 6 h,the S-doped catalyst Bi/AC-S can be obtained by reducing water thermo products with NaBH₄,and characterized by means of X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS) and transmission electron microscopy(TEM). The results show that sulfur is successfully doped with AC,and the Bi particles are dispersed comparatively uniformly in S-doped AC. The capability of Catalyst Bi/AC-S has been investigated,by taking the reduction of 4-nitrophenol(4-NP) with NaBH₄ as a model reaction. The experimental results show that the reaction is in accordance with the pseudo-first-order kinetics,under the condition of excess NaBH₄. When the reaction temperature is 30℃,concentration of 4-NP 2.0 mmol/L,concentration of NaBH₄ 80 mmol/L,and dosage of catalyst 0.02 g,the reaction rate constant is 0.358 min^-1. The repetitiveness of the catalyst is comparatively good.

Key words: S-doped activated carbon, bismuth, 4-nitrophenol, reduction

摘要： 将硝酸铋溶解在质量分数为10%的硫脲溶液中，与活性炭（AC）混合后于180℃水热反应6 h，用NaBH₄还原水热产物得到掺杂S的催化剂Bi/AC-S。用X-射线衍射仪（XRD）、透射电镜（TEM）和光电子能谱仪（XPS）对催化剂进行表征。结果表明，S成功掺杂在AC中，Bi颗粒在掺S活性炭中分布较均匀。以NaBH₄还原对硝基苯酚（4-NP）为模型反应，考察了此催化剂的性能。结果表明，在NaBH₄过量的条件下，该反应为准一级反应。在反应温度为30℃、4-NP浓度为2.0 mmol/L、NaBH₄浓度为80 mmol/L、催化剂用量为0.02 g时，测得反应速率常数为0.358 min^-1。催化剂的重复性较好。

关键词: 硫掺杂活性炭, 铋, 对硝基苯酚, 还原

CLC Number: 

• X703.1

• O643.36