Solvothermal Synthesis, Structural Characterization and Optical Properties of Pr-Doped CeO(2) and Their Degradation for Acid Orange 7.
Solvothermal Synthesis, Structural Characterization and Optical Properties of Pr-Doped CeO(2) and Their Degradation for Acid Orange 7.
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DOI：
10.3390/ma15196953
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发表时间：
2022-10-07
期刊：
影响因子：
--
通讯作者：
Ding Z
中科院分区：
文献类型：
--
作者：
Xu Y;Wu P;Wu M;Gu Y;Yu H;Ding Z
以乙二醇和蒸馏水的混合溶液为溶剂，在不添加任何试剂的情况下，以Ce(NO3)3·6H2O和Pr(NO3)3·6H2O为原料，采用溶剂热法制备了不同掺杂浓度的Pr掺杂CeO2。研究了Pr掺杂对物相组成、晶体结构和形貌以及Pr价态和氧空位缺陷的影响。 Pr阳离子进入正常三价的CeO2晶格，形成基于萤石结构的Pr-CeO2固溶体。较大的三价Pr取代了CeO2晶体中的四价Ce并通过氧空位缺陷进行补偿，从而引起晶格的局部晶格膨胀。此外，随着Pr含量的增加，Pr掺杂的CeO2固溶体表现出明显的颜色变化，从亮奶油色到砖红色到深棕色。利用国产医用紫外线灯对AO7染料的降解情况进行了研究； 1%和2% Pr掺杂CeO2对AO7的去除效率接近100%，远高于未掺杂CeO2的66.2%。
Pr-doped CeO2 with different doping levels was prepared from Ce(NO3)3∙6H2O and Pr(NO3)3∙6H2O by solvothermal method without any additional reagents, in which the mixed solution of ethylene glycol and distilled water was employed as a solvent. The influences of Pr-doping on phase composition, crystal structure and morphology were investigated, as well as Pr valence and oxygen vacancy defects. The Pr cations entered into the CeO2 crystal lattice with normal trivalence and formed a Pr-CeO2 solid solution based on the fluorite structure. The larger trivalent Pr was substituted for tetravalent Ce in the CeO2 crystal and compensated by oxygen vacancy defects, which caused the local lattice expansion of the crystal lattice. Moreover, the Pr-doped CeO2 solid solutions exhibited visible color variation from bright cream via brick red to dark brown with the increasing of Pr contents. The degradation of AO7 dye was also investigated using a domestic medical ultraviolet lamp; the removal efficiency of AO7 by 1% and 2% Pr-doped CeO2 approached 100%, much higher than 66.2% for undoped CeO2.
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