黄彬彬1,2?覮,梁凤仪1,2,杨湛1,2,谢寄托1,2.CTAB-PdNPs聚集体对4-氯硝基苯的催化加氢研究[J].湖南大学学报:自然科学版,2019,(6):96~102
CTAB-PdNPs聚集体对4-氯硝基苯的催化加氢研究
Study on Catalytic Hydrogenation of P-Chloronitrobenzene by CTAB-Pd Nanoparticles
  
DOI:
中文关键词:  催化还原  对氯硝基苯  贵金属纳米颗粒聚集体  表面活性剂
英文关键词:catalytic reduction  p-chloronitrobenzene  noble metal nanoparticles aggregation  surfactant
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作者单位
黄彬彬1,2?覮,梁凤仪1,2,杨湛1,2,谢寄托1,2 (1. 湖南大学 环境科学与工程学院湖南 长沙 410082 2. 环境生物与控制教育部重点实验室(湖南大学)湖南 长沙 410082) 
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中文摘要:
      利用表面活性剂的静电作用和自组装特性,在CTAB诱导下合成CTAB-PdNPs聚集体.研究显示,阳离子表面活性剂与阴离子Pd前驱体之间的静电作用力能有效抵消阳离子亲水头基团CTA+之间的静电斥力,从而从分子水平驱动形成表面活性剂组装体. 研究选取水体中微污染物4-氯硝基苯为研究对象,以催化还原脱氯反应为探针反应,结果显示合成的CTAB-PdNPs聚集体具有高催化活性和强脱卤能力,可在90 min内将4-氯硝基苯完全脱氯形成苯胺. 研究进一步考察了Pd投加量、CTAB浓度、起始pH值、硼氢化钠的投加量等因素对4-氯硝基苯的催化脱氯过程的影响,最佳条件为:Pd投加量为0.125 mmol/L,CTAB浓度为1.00 mmol/L,起始pH值为5,硼氢化钠的投加量为15 mmol/L.该CTAB-PdNPs聚集体还显示了较强的催化稳定性,8次循环实验后仍可达到81.9%的脱氯效率.本研究不仅报道了一种简易的合成特定规则形状PdNPs组装体的新方法,还为环境中微污染物的修复去除提供了一种可行技术.
英文摘要:
      This research mainly used the electrostatic interaction and self-assembly of surfactant to induce the formation of CTAB-PdNPs aggregation. The results showed that the electrostatic interaction between the cationic surfactant and anionic Pd precursor can shield the electrostatic repulsion between the hydrophilic groups of CTA+. It drives the formation of CTAB-PdNPs aggregation on the molecular level. This study chose p-CNB as target pollutant and its catalytic reduction as probe, showing that CTAB-PdNPs have high catalytic activity and dehalogenation ability which can convert p-CNB into aniline in 90 minutes. Besides, this study further investigated the effect of Pd dosages,CTAB concentration, initial pH and NaBH4 dosages on the catalytic reduction. The optimum conditions were Pd dosage value of 0.125 mmol/L,CTAB concentration value of 1.0 mmol/L,initial pH value of 5 and NaBH4 dosage value of 15 mmol/L. The dechlorination efficiency of p-CNB can reach up to 81.9% after eight times recycle tests,which proves the aggregation has an outstanding catalytic stability. Above all,this study not only reports a new method of synthesizing PdNPs assembly with special regular shapes,but also provides a feasible technology for the removal of micro-pollutants in the environment.
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