Zhang Weihua, Quan Xie, Wang Jingxian, Zhang Zhuoyong, Chen Shuo
School of Environmental and Biological Science and Technology, Dalian University of Technology, 116024 Dalian, PR China.
Chemosphere. 2006 Sep;65(1):58-64. doi: 10.1016/j.chemosphere.2006.02.060. Epub 2006 Apr 18.
The Ni-Fe bimetallic particles have been laboratory prepared using sodium borohydride (NaBH4) as the reductant to reduce Ni2+ and Fe2+ in aqueous solution simultaneously, and characterized by TEM, XRD, BET and XPS. The particles were proved to be nanoscale amorphous alloy with an average diameter of about 30 nm and a BET surface area of 20.9 m2 g(-1). Experiments for dechlorination of pentachlorophenol (PCP) by the Ni-Fe bimetallic nanoscale particles in aqueous solutions were carried out under the enhancement of ultrasound. Major factors that influence the dechlorination efficiency, such as initial pH value, Ni content in the Ni-Fe particles, and output power of ultrasonic irradiation, were investigated. The results indicated that Ni-Fe nanoscale bimetallic particles were very effective for the dechlorination of PCP. Dechlorination efficiency was 46% in 30 min under the optimal condition without assistance of ultrasound, whereas it increased to 96% when ultrasonic irradiation was present. Initial pH value showed apparent effect on the dechlorination. As the pH varied from acidic condition to neutral condition, the dechlorination efficiency decreased dramatically. In addition, the dechlorination efficiency was improved with increased Ni/Fe ratio and ultrasonic output power. Less chlorinated phenols including tetrachlorophenol, trichlorophenol, dichlorophenol, monochlorophenol were formed during the initial reaction, and phenol was determined by GC-MS as sole product in the end of reaction.
通过使用硼氢化钠（NaBH₄）作为还原剂，在实验室中制备了镍铁双金属颗粒，以同时还原水溶液中的Ni²⁺和Fe²⁺，并通过透射电子显微镜（TEM）、X射线衍射（XRD）、比表面积（BET）和X射线光电子能谱（XPS）对其进行了表征。结果表明，这些颗粒为纳米级非晶合金，平均直径约为30 nm，BET表面积为20.9 m² g⁻¹。在超声强化条件下，开展了水溶液中镍铁双金属纳米颗粒对五氯苯酚（PCP）脱氯的实验。研究了影响脱氯效率的主要因素，如初始pH值、镍铁颗粒中的镍含量以及超声辐射的输出功率。结果表明，镍铁纳米级双金属颗粒对PCP脱氯非常有效。在无超声辅助的最佳条件下，30分钟内脱氯效率为46%，而在有超声辐射时，脱氯效率提高到了96%。初始pH值对脱氯有明显影响。随着pH值从酸性条件变为中性条件，脱氯效率急剧下降。此外，脱氯效率随着镍/铁比和超声输出功率的增加而提高。在初始反应过程中生成了包括四氯苯酚、三氯苯酚、二氯苯酚、一氯苯酚在内的较少氯化苯酚，反应结束时通过气相色谱-质谱联用仪（GC-MS）测定苯酚为唯一产物。
