Pd/Fe及纳米Pd/Fe对氯酚的脱氯研究

采用化学沉淀法制备得到了纳米Fe和纳米Pd/Fe(20～100nm),利用制备的纳米催化剂对氯酚进行了催化脱氯研究,并与常规的零价铁和Pd/Fe进行了对比分析.结果表明,纳米颗粒具有较高的比表面积和表面反应活性,所制备的纳米Pd/Fe双金属BET比表面积达到12.4m²/g,而商用铁颗粒(<10m)的比表面积只有0.49m²/g;当钯化率为0.0666%,纳米Pd/Fe用量在6g/L时,氯酚脱氯率达到90%以上,在相同的处理效果下,常规Pd/Fe的使用量为纳米Pd/Fe的20倍左右,纳米Pd/Fe催化氯酚的脱氯降解遵循一级反应动力学.

Studies on dechlorination of chlorophenols with Pd/Fe and nanoscale Pd/Fe

Nanoscale Fe and Pd/Fe (20~100nm) were prepared adopting chemical precipitation technique; and studies on catalytic dechlorination of chlorophenol using the prepared nanoscale catalyst and contrast analysis with traditional zero-valent iron and Pd/Fe were carried out. Nanoscale particles possessed rather high specific surface area and surface reactivity and that the specific surface area of the prepared nanoscale Pd/Fe bimetal BET reached 12.4m2/g, while the commercially available Fe particle (<10m) had only the specific surface area 0.49m2/g. Dechlorination rate of chlorophenol reached over 90% at Pd loading of 0.0666%, and nanoscale Pd/Fe use amount of 6g/L; while under same treating effect, at traditional use amount of about 20 times of the use amount of nanoscale Pd/Fe, the dechlorination degradation of chlorophenol catalyzed by nanoscale Pd/Fe followed the first order reaction dynamics.