Encapsulating Ag Nanoparticles into ZIF-8 as an Efficient Strategy to Boost Uranium Photoreduction without Sacrificial Agents

2021 ◽  
Author(s):  
Pengyan Jiang ◽  
Kaifu Yu ◽  
Haibo Yuan ◽  
Rong He ◽  
Mengping Sun ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Organic Molecules ◽  
Efficient Strategy ◽  
Hexavalent Uranium ◽  
Uranium Removal

Photoreduction of hexavalent uranium (U(VI)) opens up an novel avenue to promoting the kinetics, capacity, and selectivity during uranium removal, where organic molecules are generally applied as the sacrificial agents...

scholarly journals Organic Molecule Detection Based on SERS in Microfluidics

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Xin Zhang ◽  
Haiyan Zhang ◽  
Sheng Yan ◽  
Zugang Zeng ◽  
Anshou Huang ◽  
...  
Keyword(s):  
Environmental Monitoring ◽  
Ag Nanoparticles ◽  
Organic Molecule ◽  
Organic Molecules ◽  
Chemical Reduction ◽  
Fdtd Method ◽  
Great Influence ◽  
High Sensitivity ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrate

AbstractSensitive in situ detection of organic molecules is highly demanded in environmental monitoring. In this work, the surface enhanced Raman spectroscopy (SERS) is adopted in microfluidics to detect the organic molecules with high accuracy and high sensitivity. Here the SERS substrate in microchannel consists of Ag nanoparticles synthesized by chemical reduction. The data indicates the fabrication conditions have great influence on the sizes and distributions of Ag nanoparticles, which play an important role on the SERS enhancement. This result is further confirmed by the simulation of electromagnetic field distributions based on finite difference time domain (FDTD) method. Furthermore, the SERS spectra of organic molecule (methylene blue) obtained in this plasmonic microfluidic system exhibit good reproducibility with high sensitivity. By a combination of SERS and microfluidics, our work not only explores the research field of plasmonics but also has broad application prospects in environmental monitoring.

SERS active Ag nanoparticles in mesoporous silicon: detection of organic molecules and peptide-antibody assays

2011 ◽  
Vol 43 (6) ◽  
pp. 730-736 ◽  
Author(s):  
Alessandro Virga ◽  
Paola Rivolo ◽  
Emiliano Descrovi ◽  
Alessandro Chiolerio ◽  
Gabriella Digregorio ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Organic Molecules ◽  
Mesoporous Silicon ◽  
Peptide Antibody ◽  
Antibody Assays

Carbonate effects on hexavalent uranium removal from water by nanocrystalline titanium dioxide

2006 ◽  
Vol 136 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Mahmoud Wazne ◽  
Xiaoguang Meng ◽  
George P. Korfiatis ◽  
Christos Christodoulatos
Keyword(s):  
Titanium Dioxide ◽  
Hexavalent Uranium ◽  
Uranium Removal ◽  
Nanocrystalline Titanium ◽  
Nanocrystalline Titanium Dioxide

Uranium removal by sulfate reducing biofilms in the presence of carbonates

2005 ◽  
Vol 52 (7) ◽  
pp. 49-55 ◽  
Author(s):  
E. Marsili ◽  
H. Beyenal ◽  
L. Di Palma ◽  
C. Merli ◽  
A. Dohnalkova ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Desulfovibrio Desulfuricans ◽  
Bicarbonate Buffer ◽  
Flow Reactors ◽  
Sulfate Reducing ◽  
Hexavalent Uranium ◽  
Uranium Removal ◽  
Nanocrystalline Structures ◽  
Continuous Flow Reactors ◽  
Reducing Bacteria

Hexavalent uranium [U(VI)] was immobilized in biofilms composed of the sulfate reducing bacteria (SRB), Desulfovibrio desulfuricans G20. The biofilms were grown in two flat-plate, continuous-flow reactors using lactate as the electron donor and sulfate as the electron acceptor. The growth medium contained uranium U(VI) and the pH was maintained constant using bicarbonate buffer. The reactors were operated for 5 months, and during that time biofilm activity and uranium removal were evaluated. The efficiency of uranium removal strongly depended on the concentration of uranium in the influent, and was estimated to be 30.4% in the reactor supplied with 3 mg/L of U(VI) and 73.9% in the reactor supplied with 30 mg/L of U(VI). TEM and SAED analysis showed that uranium in both reactors accumulated mostly on microbial cell membranes and in the periplasmic space. The deposits had amorphous or poor nanocrystalline structures.

High Resolution Replication of Organoclay Surfaces

1982 ◽  
Vol 40 ◽  
pp. 576-577
Author(s):  
W. W. Barker ◽  
W. E. Rigsby ◽  
V. J. Hurst ◽  
W. J. Humphreys
Keyword(s):  
Clay Mineral ◽  
Organic Molecule ◽  
Organic Molecules ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Naturally Occurring ◽  
Silicate Layers ◽  
Mineral Identification

Experimental clay mineral-organic molecule complexes long have been known and some of them have been extensively studied by X-ray diffraction methods. The organic molecules are adsorbed onto the surfaces of the clay minerals, or intercalated between the silicate layers. Natural organo-clays also are widely recognized but generally have not been well characterized. Widely used techniques for clay mineral identification involve treatment of the sample with H2 O2 or other oxidant to destroy any associated organics. This generally simplifies and intensifies the XRD pattern of the clay residue, but helps little with the characterization of the original organoclay. Adequate techniques for the direct observation of synthetic and naturally occurring organoclays are yet to be developed.

Direct phase determination in electron crystallography: small organic molecules

1992 ◽  
Vol 50 (2) ◽  
pp. 1166-1167
Author(s):  
Douglas L. Dorset
Keyword(s):  
Organic Molecules ◽  
Data Sets ◽  
Temperature Structure ◽  
3D Analysis ◽  
Intensity Data ◽  
Electron Crystallography ◽  
Phase Determination ◽  
Measured Intensity ◽  
3D Data

The quantitative use of electron diffraction intensity data for the determination of crystal structures represents the pioneering achievement in the electron crystallography of organic molecules, an effort largely begun by B. K. Vainshtein and his co-workers. However, despite numerous representative structure analyses yielding results consistent with X-ray determination, this entire effort was viewed with considerable mistrust by many crystallographers. This was no doubt due to the rather high crystallographic R-factors reported for some structures and, more importantly, the failure to convince many skeptics that the measured intensity data were adequate for ab initio structure determinations.We have recently demonstrated the utility of these data sets for structure analyses by direct phase determination based on the probabilistic estimate of three- and four-phase structure invariant sums. Examples include the structure of diketopiperazine using Vainshtein's 3D data, a similar 3D analysis of the room temperature structure of thiourea, and a zonal determination of the urea structure, the latter also based on data collected by the Moscow group.

A MOLECULAR DYNAMICS STUDY OF ELECTRONIC SPUTTERING OF LARGE ORGANIC MOLECULES

1989 ◽  
Vol 50 (C2) ◽  
pp. C2-33-C2-35 ◽  
Author(s):  
D. FENYÖ ◽  
B. U.R. SUNDQVIST ◽  
B. KARLSSON ◽  
R. E. JOHNSON
Keyword(s):  
Molecular Dynamics ◽  
Organic Molecules
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