摘要:
对比Ni/Fe和Pd/Fe二元金属对莠去津的催化降解特性.结果表明,在相同反应条件下(C0=20.0mg·l-1,pH=3.0,金属添加量为1.0g),与Fe0相比,Pd/Fe对莠去津表现出比Ni/Fe更加明显的催化脱氯效果,反应75min,Fe0对莠去津的脱氯效率为7.09%,Ni/Fe达到99.11%,而Pd/Fe反应30min就能够100%还原莠去津.通过SEM,XRS和BET-N2测试,Pd以无定形状态分布在Fe0的表面,有利于比表面积的增大,Ni/Fe和Pd/Fe的比表面积分别为11.671和16.94m2·g-1;而且Pd/Fe对H2有非常强的吸附能力,1cm3的Pd在常温下能够吸附1000mlH2,最高能够达到2800ml.体系pH值对Ni/Fe和Pd/Fe催化莠去津的影响非常大,pH=2.0时,Pd/Fe反应15min能够100%降解莠去津;pH=3.0时,30min达到完全降解;pH=4.0和未调节pH条件下,75min的脱氯效率只有82.55%和46.5%.
Abstract:
Catalytic dechlorination properties of Pd/Fe and Ni/Fe bimetallic on Atrazine were studied in this paper.The results indicated:under the same conditions(C0=20.0mg·l-1,pH=3.0,catalyst adding amount 1.0g),by comparison with Fe0 and Ni/Fe,Pd/Fe presented more effective catalytic dechlorination on Atrazine,with 100% dechlorination efficiency in 30min,very superior to that of Fe0 and Ni/Fe,with 7.09% and 99.11% dechloriantion efficiency in 75min,respectively.Which was attributed to amorphous distribution of Pd on the surface of Fe0,increasing the specific surface of Pd/Fe,and the surface of Pd/Fe had strong Adsorption of H2,1cm3 of Pd can absorb 1000ml of H2 at normal temperature,maximum absorbability achieve 2800ml.But in consistent with the results obtained by Ni/Fe,pH value had great effect on the catalytic property of Pd/Fe,at pH of 2.0 and 3.0,Pd/Fe dechlorinated atrazine totally in 15min and in 30min,respectively.And at pH of 4.0 and unregulated conditions,dechlorination efficiency of atraizne in 75min were 82.55% and 46.5%,respectively.
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