Search

Your search keyword '"Sheng, Daopeng"' showing total 9 results
Start Over Author "Sheng, Daopeng" Journal inorganic chemistry
9 results on '"Sheng, Daopeng"'

2. Substitutional Disorder of SeO32–/IO3– in the Crystalline Solid Matrix: Insights into the Fate of Radionuclides 79Se and 129I in the Environment

Author

Wang, Yaxing, primary, Wang, Yumin, additional, Zhang, Linjuan, additional, Chen, Lanhua, additional, Liu, Zhiyong, additional, Yin, Xuemiao, additional, Sheng, Daopeng, additional, Diwu, Juan, additional, Wang, Jianqiang, additional, Liu, Ning, additional, Chai, Zhifang, additional, and Wang, Shuao, additional

Published
2017
Full Text
View/download PDF

3. Mild Periodic Acid Flux and Hydrothermal Methods for the Synthesis of Crystalline f-Element-Bearing Iodate Compounds

Author

Wang, Yaxing, Duan, Tao, Weng, Zhehui, Ling, Jie, Yin, Xuemiao, Chen, Lanhua, Sheng, Daopeng, Diwu, Juan, Chai, Zhifang, Liu, Ning, and Wang, Shuao

Abstract

f-element-bearing iodate compounds are a large family mostly synthesized by hydrothermal reactions starting with actinide/lanthanide ions and iodic acid or iodate salt. In this work, we introduce melting periodic acid flux as a new reaction medium and provide a safe way for single-crystal growth of a series of new f-element iodate compounds including UO2(IO3)2·H2O (1), UO2(IO3)2(H2O)·HIO3(2), α-Th(IO3)2(NO3)(OH) (3), β-Th(IO3)2(NO3)(OH) (4), and (H3O)9Nd9(IO3)36·3HIO3(5). The structures of these compounds deviate from those afforded from hydrothermal reactions. Specifically, compounds 1and 2exhibit pillared structures consisting of uranyl pentagonal bipyramids and iodate trigonal pyramids. Compounds 3and 4represent two new thorium iodate compounds that are constructed from subunits of thorium dimers. Compound 5exhibits a flower-shaped trivalent lanthanide iodate structure with HIO3molecules and H3O+cations filled in the channels. The aliovalent replacement of f elements in 5is available from a hydrothermal process, further generating compounds of Th2(IO3)8(H2O) (6) and Ce2(IO3)8(H2O) (7). The distinct absorption features are observed in isotypic compounds 5–7, where 7shows typical semiconductor behavior with a band gap of 2.43 eV. Remarkably, noncentrosymmetric 1, 6, and 7exhibit strong second-harmonic-generation efficiencies of 1.3, 3.2, and 9.2 times, respectively, that of the commercial material KH2PO4. Additionally, the temperature-dependent emission spectra of 1and 2were also collected showing typical emission features of uranyl units and a negative correlation between the intensities of the emissions with temperature. Clearly, the presented low-temperature melting inorganic acid flux synthesis would provide a facile and effective strategy to produce a large new family of structurally versatile and multifunctional f-element inorganic compounds.

Published
2024
Full Text
View/download PDF

8. Probing the Influence of Phosphonate Bonding Modes to Uranium(VI) on Structural Topology and Stability: A Complementary Experimental and Computational Investigation

Author

Zheng, Tao, primary, Wu, Qun-Yan, additional, Gao, Yang, additional, Gui, Daxiang, additional, Qiu, Shiwen, additional, Chen, Lanhua, additional, Sheng, Daopeng, additional, Diwu, Juan, additional, Shi, Wei-Qun, additional, Chai, Zhifang, additional, Albrecht-Schmitt, Thomas E., additional, and Wang, Shuao, additional

Published
2015
Full Text
View/download PDF

9. Substitutional Disorder of SeO 3 2- /IO 3 - in the Crystalline Solid Matrix: Insights into the Fate of Radionuclides 79 Se and 129 I in the Environment.

Author

Wang Y, Wang Y, Zhang L, Chen L, Liu Z, Yin X, Sheng D, Diwu J, Wang J, Liu N, Chai Z, and Wang S

Abstract

As the crucial soluble species of long-lived radionuclides 129 I and 79 Se, iodate and selenite anions commonly share similar geometry of the trigonal pyramid XO 3 (X = I, Se) but in different valence states. Although large amounts of investigations have been performed aiming at understanding the environmental behavior of these two anions individually, studies on cases when they coexist are extremely scarce. Structurally well-characterized natural/synthetic crystalline solids simultaneously incorporating these two anions as potential solubility-limiting products at the nuclear waste geological depository remain elusive. We report here a crystalline solid Th(IO 3 ) 2 (SeO 3 ) representing the first example of aliovalent substitution between IO 3 - and SeO 3 2- sharing the same structural site, as demonstrated by single crystal X-ray diffraction, laser-ablation inductively coupled plasma mass spectrometry analysis, and spectroscopic techniques including infrared, Raman, and X-ray absorption spectroscopies. Sequentially, in the Eu(IO 3 ) 3 solid matrix, we demonstrated that the IO 3 - site can be sufficiently substituted by SeO 3 2- in the presence of Th 4+ via simultaneous incorporation of Th 4+ and SeO 3 2- in a charge-balancing mechanism. The obtained results provide insights into the environmental behavior of fission products 79 Se and 129 I: they may cocrystallize in one solid matrix and may be efficiently immobilized by incorporation into each other's solid phase through solid solution.

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results