研究论文
徐新华,金剑,卫建军,汪大(Hui).纳米Pd/Fe双金属对2,4-二氯酚的脱氯机理及动力学[J].环境科学学报,2004,24(4):561-567
纳米Pd/Fe双金属对2,4-二氯酚的脱氯机理及动力学
- Dechlorination mechanism and kinetic of 2,4-DCP by nanoscale Pd/Fe system
- 关键词：纳米Pd/Fe双金属 2,4-二氯酚 脱氯 机理 动力学
- 基金项目：国家教育部留学回国人员基金(2002 247);浙江省科技计划项目(2004C34006)
- 作者
- 单位
- 徐新华
- 浙江大学环境工程系,杭州 310027
- 金剑
- 浙江大学环境工程系,杭州 310027
- 卫建军
- 浙江大学环境工程系,杭州 310027
- 汪大(Hui)
- 浙江大学环境工程系,杭州 310027
- 摘要：采用纳米PdFe双金属对2,4二氯酚(2,4-DCP)进行了催化还原脱氯处理.结果表明,纳米PdFe双金属具有较高的比表面积和反应活性,对2,4-DCP具有较好的脱氯效率.当纳米PdFe用量在6g·L-1时,2,4-DCP脱氯率达到90%以上;脱氯效率与pH值、温度、钯化率、PdFe投加量等因素有关.2,4-DCP在脱氯过程中先生成邻氯酚和对氯酚,而后继续脱氯生成苯酚,或由2,4-DCP直接降解成苯酚.2,4-DCP降解符合拟一级反应动力学.2,4-DCP催化还原脱氯反应的活化能为1397kJ·mol-1.
- Abstract：Nanoscale Pd/Fe bimetallic catalysts were synthesized via chemical deposition and used to decompose 2,4-DCP. Nanoscale particles were characterized by high surface area to volume ratios and high reactivity. Batch experiments demonstrated that the nanoscale Pd/Fe particles could effectively dechlorinate 2,4-DCP at relatively low metal to solution ratio (6g·L-1), Dechlorination efficiency reached 90% at Pd weight ratio (Pd to Fe) 0.11%. Dechlorination was affected by reaction temperature, pH, Pd ratio and the addition of nanoscale Pd/Fe.2-CP and 4 CP represent stable partially dechlorination intermediates, and then phenol. Some 2,4-DCP was dechlorinated to phenol indirectly. The dechlorination was believed to take place on the surface of the nanoscale Pd/Fe bimetallic particles via a pseudo-first order reaction,the activation energy was found to be 139.7kJ·mol-1.
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