收稿日期: 2022-05-12
网络出版日期: 2022-11-03
基金资助
国家自然科学基金项目(51964040);国家自然科学基金项目(51564042)
Effect of rare earth element of Ce and Nd co-doped with zinc oxide on photocatalytic performance of degradation of Rhodamine B
Received date: 2022-05-12
Online published: 2022-11-03
采用水热合成法制备纳米级半导体光催化材料,镧系元素是理想的金属掺杂剂,因为其独特的光学性质和未被完全占据的4f轨道,所以掺杂镧系元素可以提高催化剂的活性。最近的研究表明,通过共掺杂两种稀土元素可以更有效地改良光催化剂,不仅可以通过协同效应有效提高催化剂的光吸收能力,同时也对光生载流子的复合产生了抑制。实验采用铈、钕两种镧系元素共掺杂制备改性半导体氧化锌光催化材料。通过XRD、SEM、XPS、EDS、BET、UV-vis和PL对制备的光催化材料进行分析与表征,得到了带隙更窄、比表面积更大、晶粒尺寸更小的高性能改性光催化材料。将其应用在降解废水中罗丹明B实验中,结果表明,2%Ce5.5%Nd掺杂配比的氧化锌在40 min时降解率达到92.2%,60 min时降解率达到98.3%,整体催化性能较单掺杂铈与单掺杂钕相比有了很大的提高。总结分析稀土金属铈、钕共掺杂提高氧化锌光催化性能的原因包括:氧化锌晶格的畸变、杂质能级的产生及稀土离子价态的影响、形貌及比表面积的影响、禁带宽度及稀土离子氧化还原对的产生等。
管志远 , 张晓伟 , 王觅堂 , 张栋梁 , 朱昌乐 . 稀土元素铈钕共掺氧化锌对降解罗丹明B光催化性能的影响[J]. 无机盐工业, 2022 , 54(10) : 155 -162 . DOI: 10.19964/j.issn.1006-4990.2022-0001
Nanoscale semiconductor photocatalytic materials were prepared by hydrothermal synthesis method.Lanthanides were ideal metal dopants,because of their unique optical properties and not fully occupied 4f orbitals,and doping lanthanides could improve the activity of catalysts.Recent studies had shown that photocatalysts could be more effectively improved by co-doping two rare earth elements,which could not only effectively improve the light absorption capacity of the catalysts through synergistic effects,but also inhibit the recombination of photogenerated carriers.The modified semiconductor ZnO photocatalytic materials were prepared by co-doping the two elements of cerium and neodymium.The prepared photocatalytic materials were analyzed and characterized by XRD,SEM,XPS,EDS,BET,UV-vis and PL,and high-performance modified photocatalysts with narrower band gap,larger specific surface area and smaller grain size were obtained.It was applied to the experiment of degrading rhodamine B simulated pollutants in wastewater,and the results showed that the degradation rate of zinc oxide doped with 2% Ce and 5.5% Nd reached 92.2% at 40 min and 98.3% at 60 min.The overall catalytic performance was greatly improved compared with single-doped Ce and single-doped Nd.The reasons for the co-doping of rare earth metals cerium and neodymium to improve the photocatalytic performance of ZnO was included:the distortion of ZnO lattice,the generation of impurity energy and the influence of rare earth ion valence,the influence of morphology and specific surface area,the band gap and the generation of rare earth ion redox pairs,etc.
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