当前位置: X-MOL 学术Environ. Res. › 论文详情
Impact of Nanoceria Shape on Degradation of Diethyl Paraoxon: Synthesis, Catalytic Mechanism, and Water Remediation Application
Environmental Research ( IF 5.026 ) Pub Date : 2020-05-22 , DOI: 10.1016/j.envres.2020.109653
Shi-Wei Zhan; Wei-Bin Tseng; Wei-Lung Tseng

A series of nanomaterials have been demonstrated to be powerful for direct degradation of diethyl paraoxon (EP) to diethyl phosphate and 4-nitrophenol in aqueous solution. However, comparison of catalytic activity of different nanomaterials toward EP is rarely explored. In the present study, four different morphological nanoceria (cubes, rods, polyhedral, and spheres) were synthesized, characterized, and evaluated as a catalyst for the degradation of EP in comparison to other commercially available nanomaterials. Among the tested nanoceria, the cerium dioxide (CeO2) nanopolyhedra possess the best catalytic activity toward the hydrolysis of EP owing to their abundant oxygen vacancy sites, optimal ratio of Ce(III) to Ce(IV), and specific exposed facets. Under the conditions of 0.2 M NH3/NH4Cl buffer and 25 °C, the CeO2 nanopolyhedra catalyzed the reduction of EP to 4-nitrophenol with a >99% conversion at pH 8.0 for 50 h, at pH 10.0 for 12 h, and at pH 12.0 for 2.5 h. The catalytic degradation of nearly 100% EP in NH3/NH4Cl buffer (pH 10.0) at 25 °C is in the decreasing order of CeO2 nanopolyhedra > CeO2 nanorods > ZnO nanospheres (NSs) > CeO2 nanocubes > TiO2 NSs> CeO2 NSs > Fe3O4 NSs ∼ Co3O4 NSs ∼ control experiment. The mechanism for the degradation of EP was confirmed by monitoring catalytic kinetics of the CeO2 nanopolyhedra in the presence of EP, dimethyl paraoxon, 4-nitrophenyl phosphate, and parathion. The nanocomposites were simply fabricated by electrostatic self-assembly of the CeO2 nanopolyhedra and poly(diallyldimethylammonium chloride)-capped gold nanoparticles (PDDA-AuNPs). The resultant nanocomposites still efficiently catalyzed NaBH4-mediated reduction of 4-nitrophenol to 4-aminophenol with a normalized rate constant of 6.68 ± 0.72 s-1 g-1 and a chemoselectivity of >99%. In confirmation of the robustness and applicability of the as-prepared nanocomposites, they were further used to catalyze the degradation of EP to 4-amionphenol in river water and seawater.
更新日期:2020-05-22

 

全部期刊列表>>
如何通过Nature平台传播科研成果
跟Nature、Science文章学绘图
隐藏1h前已浏览文章
课题组网站
新版X-MOL期刊搜索和高级搜索功能介绍
中洪博元
ACS材料视界
x-mol收录
南开大学
朱守非
廖良生
郭东升
汪铭
伊利诺伊大学香槟分校
徐明华
中山大学化学工程与技术学院
试剂库存
天合科研
down
wechat
bug