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In Situ Creation of Oxygen Vacancies in Porous Bimetallic La/Zr Sorbent for Aqueous Phosphate: Hierarchical Pores Control Mass Transport and Vacancy Sites Determine Interaction
Xiang, Chao; Ji, Qinghua; Zhang, Gong; Wang, Hongjie; Qu, Jiuhui
2020-01-07
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume54Issue:1Pages:437-445
AbstractPorous materials constructed from hierarchical pores are beneficial for the mass transport during the aqueous adsorption process. To achieve high performance, it is important to create adequate numbers of active centers to anchor the target ions in the solution. Synchronous construction of powerful bonding sites in the surface area amplification process should be a promising path for developing outstanding sorbents. By in situ evaporation of reductive soft organic templates, we successfully confined oxygen vacancies (V-o) in porous La/Zr bimetallic oxides. For aqueous phosphate contaminants, the as-produced porous sorbent exhibited superior removal performance, with equilibrium adsorption capacities almost similar to 2 times higher those that of the V-o -free counterpart. Based on mass transfer model analysis, pore structure has the potential to buffer external influence on mass transfer. Under an adverse condition (pH 9.0), the mass transfer was similar to 2.5 times higher than that in the pore- free one (0.10 min(-1) vs 0.04 min(-1)), ensuring the possibility of diffusing phosphate in further contact with these active sites. According to results of orbital interaction analysis and X-ray spectroscopy measurements, V-o -dominated active sites not only enhanced attractive orbital bonding interaction toward phosphate but also converted repulsive interaction into attractive reaction, thereby eliminating this kinetics barrier and promoting the rate of phosphate chemisorption reaction.
Department中国科学院饮用水科学与技术重点实验室
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45309
Collection中国科学院饮用水科学与技术重点实验室
Recommended Citation
GB/T 7714
Xiang, Chao,Ji, Qinghua,Zhang, Gong,et al. In Situ Creation of Oxygen Vacancies in Porous Bimetallic La/Zr Sorbent for Aqueous Phosphate: Hierarchical Pores Control Mass Transport and Vacancy Sites Determine Interaction[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(1):437-445.
APA Xiang, Chao,Ji, Qinghua,Zhang, Gong,Wang, Hongjie,&Qu, Jiuhui.(2020).In Situ Creation of Oxygen Vacancies in Porous Bimetallic La/Zr Sorbent for Aqueous Phosphate: Hierarchical Pores Control Mass Transport and Vacancy Sites Determine Interaction.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(1),437-445.
MLA Xiang, Chao,et al."In Situ Creation of Oxygen Vacancies in Porous Bimetallic La/Zr Sorbent for Aqueous Phosphate: Hierarchical Pores Control Mass Transport and Vacancy Sites Determine Interaction".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.1(2020):437-445.
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