Heterogeneous photocatalytic degradation of 4-nitrophenol in aqueous suspension by Ln (La3+, Nd3+ or Sm3+) doped ZnO nanoparticles
Heterogeneous photocatalytic degradation of 4-nitrophenol in aqueous suspension by Ln (La3+, Nd3+ or Sm3+) doped ZnO nanoparticles
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DOI：
10.1016/j.molcata.2012.08.018
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发表时间：
2012-12-01
影响因子：
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通讯作者：
Ebrahimiasl, S.
中科院分区：
文献类型：
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作者：
Khatamian, M.;Khandar, A. A.;Ebrahimiasl, S.
采用聚合物热解法合成了不同Ln （Ln = La， Nd和Sm）含量的镧系掺杂ZnO纳米粒子，并通过XRD， UV-vis， SEM， TGA和TEM等多种技术对其进行了表征。XRD结果表明，Ln（3+）以细小的Ln(2)O(3)簇的形式均匀分布在ZnO纳米颗粒上。SEM和TEM结果表明，与纯ZnO相比，la掺杂ZnO的粒径要小得多。研究了la掺杂ZnO光催化降解4-硝基苯酚（4-NP）的活性。研究了负载类型和负载量对掺杂ZnO光催化活性的影响，并将结果与纯ZnO进行了比较。结果表明，随着La、Nd和Sm负载的增加，4 - np在掺杂镧的ZnO上的降解率分别增加到4、4和8 wt%，然后下降。结果表明，ZnO中掺杂Ln有助于在较短的辐照时间内实现4-NP的完全矿化。其中，4 wt% nd掺杂ZnO的光催化活性最高，对4- np的降解表现出较高的光催化活性。(C) 2012 Elsevier B.V.版权所有
Lanthanide doped ZnO nanoparticles with different Ln (Ln = La, Nd and Sm) contents were synthesized by polymer pyrolysis method and characterized by various techniques such as XRD, UV-vis, SEM, TGA, and TEM. The XRD results revealed that Ln(3+) is uniformly dispersed on ZnO nanoparticles in the form of small Ln(2)O(3) cluster. From SEM and TEM images it was found that the particle size of La-doped ZnO is much smaller as compared to that of pure ZnO. The photocatalytic activity of La-doped ZnO in the degradation of 4-nitrophenol (4-NP) was studied. The effects of the type and amount of loadings on the photocatalytic activity of Ln-doped ZnO were studied and the results were compared with pure ZnO. It was observed that the rate of degradation of 4-NP over Ln-doped ZnO increases with increasing La, Nd and Sm loading up to 4,4 and 8 wt% and then decreases. It was found that the doping of Ln in ZnO helps to achieve complete mineralization of 4-NP within a short irradiation time. Among the catalysts, the 4 wt% Nd-doped ZnO was the most active and showing high photocatalytic activity for the degradation of 4-NP. (C) 2012 Elsevier B.V. All rights reserved.