Structure and catalytic activity of MoZnAlO catalyst for degradation of cationic red GTL under room conditions
Structure and catalytic activity of MoZnAlO catalyst for degradation of cationic red GTL under room conditions
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DOI：
10.1016/j.cej.2012.01.003
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发表时间：
2012-02
影响因子：
15.1
通讯作者：
Yin Xu;Dezhi Sun
中科院分区：
文献类型：
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作者：
Yin Xu;Dezhi Sun
制备了一系列不同Zn/Al摩尔比的MoZnAlO催化剂。使用ICP-OES、zeta电位、XRD、BET、FTIR、H2-TPR、O2-TPD和ESR对催化剂的结构进行了表征。考察了这些催化剂在室温下降解阳离子红GTL废水的催化活性。实验结果表明，Zn/Al摩尔比为1:1的MoZnAlO催化剂对阳离子红GTL的最高脱色率和TOC去除率分别达到90.9%和65.8%。结合这些催化剂的表征结果，具有最高催化活性的Zn/Al摩尔比为1:1的MoZnAlO催化剂可能具有最低的zeta电位、最大的比表面积、特殊的晶相、特殊的Mo价态、最多的活性吸附位点以及最多的1O2或OH活性物种。还研究了这些催化剂的稳定性。由于Zn、Mo、Al的浸出浓度较低，Zn/Al摩尔比为1:1~1:3的MoZnAlO催化剂具有良好的稳定性。人们认为Al3+在决定金属之间的距离方面起着更重要的作用，从而影响金属的浸出。
A series of MoZnAlO catalysts with different Zn/Al molar ratios were prepared. The structure of the catalysts was characterized using ICP-OES, zeta potential, XRD, BET, FTIR, H2-TPR, O2-TPD and ESR. The catalytic activity of these catalysts on the degradation of cationic red GTL wastewater under room condition was investigated. The experimental results showed that the highest color removal efficiency and TOC removal efficiency of cationic red GTL can reach 90.9% and 65.8% by the MoZnAlO catalyst with 1:1 of Zn/Al molar ratio respectively. Associated with the characterization results of these catalysts, MoZnAlO catalyst with 1:1 of Zn/Al molar ratio with highest catalytic activity could be contributed to its lowest zeta potential, largest specific surface area, special crystalline phases, special Mo valences, largest number of active adsorption sites and the maximum active species of1O2or OH. The stable of these catalysts was also studied. Due to the lower leaching concentrations of Zn, Mo and Al, MoZnAlO catalyst with Zn/Al molar ratio from 1:1 to 1:3 has a good stability. It is thought that Al3+plays a more important part in determining the distance between metals, thus it affects the leaching of metals.