A novel approach for the removal of radiocesium from aqueous solution by ZSM-5 molecular sieve

2018 ◽  
Vol 139 ◽  
pp. 231-237 ◽  
Author(s):  
Xiaoqing Gao ◽  
Peng Zhang ◽  
Junqiang Yang ◽  
Xuejie Sun ◽  
Yi Fu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Molecular Sieve ◽  
Novel Approach

scholarly journals Visualization of microwave near-field distribution in sodium chloride and glucose aqueous solutions by a thermo-elastic optical indicator microscope

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhirayr Baghdasaryan ◽  
Arsen Babajanyan ◽  
Levon Odabashyan ◽  
Jung-Ha Lee ◽  
Barry Friedman ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Field Distribution ◽  
Near Field ◽  
Absorption Properties ◽  
Novel Approach ◽  
Concentration Changes ◽  
Biological Liquids ◽  
Optical Indicator ◽  
Distribution Intensity

AbstractIn this study, a new optical method is presented to determine the concentrations of NaCl and glucose aqueous solutions by using a thermo-elastic optical indicator microscope. By measuring the microwave near-field distribution intensity, concentration changes of NaCl and glucose aqueous solutions were detected in the 0–100 mg/ml range, when exposed to microwave irradiation at 12 GHz frequency. Microwave near-field distribution intensity decreased as the NaCl or glucose concentration increased due to the changes of the absorption properties of aqueous solution. This method provides a novel approach for monitoring NaCl and glucose in biological liquids by using a CCD sensor capable of visualizing NaCl and glucose concentrations without scanning.

Ultra-facile aqueous synthesis of nanoporous zeolitic imidazolate framework membranes for hydrogen purification and olefin/paraffin separation

2019 ◽  
Vol 7 (18) ◽  
pp. 10898-10904 ◽  
Author(s):  
Xu Jiang ◽  
Songwei Li ◽  
Yongping Bai ◽  
Lu Shao
Keyword(s):  
Aqueous Solution ◽  
Gas Separation ◽  
Molecular Sieve ◽  
Room Temperature ◽  
Hydrogen Purification ◽  
Step Method ◽  
Zeolitic Imidazolate Framework ◽  
Aqueous Synthesis ◽  
One Step

An ultra-facile one-step method is discovered to synthesize defect-free ZIF-8 molecular sieve membranes in aqueous solution at room temperature for exceptional gas separation.

scholarly journals Chemical adsorption of oxytetracycline from aqueous solution by modified molecular sieves

2016 ◽  
Vol 75 (5) ◽  
pp. 1221-1232 ◽  
Author(s):  
Junmin Lv ◽  
Yulong Ma ◽  
Xuan Chang ◽  
Junzhuo Fang ◽  
Lingyan Cai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Adsorption Kinetics ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Adsorption Mechanism ◽  
Chemical Adsorption ◽  
Base Property ◽  
Adsorption Sites ◽  
Adsorbed Amount

The removal of oxytetracycline (OTC) from aqueous solution on modified molecular sieve via adsorption was investigated in the present work. The copper(II) modified molecular sieve had the much higher adsorbed amount than unmodified one. The bigger pore, the more adsorption sites benefitted for the adsorbed amount of OTC. The exchanged amount of copper(II) and the acid-base property of solution were important factors influencing the removal efficiency. The adsorption kinetics, the adsorption isotherm, the adsorption thermodynamics and the proposed adsorption mechanism were studied. The analysis of adsorption isotherm indicated it is a monolayer adsorption. The fitting with adsorption kinetics, pseudo-second-order model, deduced chemical adsorption is the main rate controlling step. And the new formation of Cu-O chemical bond and the changes at bands of N-H vibration and C-N vibration by Fourier transform infrared spectrometer further confirmed the proposal adsorption mechanism was the chemical complexation of copper(II) in modified 13X with NH2 group of OTC. As the real exchanged amount of copper(II) was 149.07 mg·g−1 and the solution pH 7.0, the adsorption capacity of modified 13X for OTC reached the maximum of 2,396 mg·g−1 (with the initial concentration of 1,000 mg·L−1).

scholarly journals Structure and 3D-3D Topotactic Transformation of the Aluminophosphate Molecular Sieve PST-5 and Its Implication in New Zeolite Structure Generation

2020 ◽  
Author(s):  
Zhehao Huang ◽  
Seungwan Seo ◽  
Jiho Shin ◽  
Bin Wang ◽  
Rob Bell ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Structure Transformation ◽  
Structure Generation ◽  
Zeolite Structure ◽  
Pore Structures ◽  
Novel Approach ◽  
Shape Selective ◽  
Selective Catalysis ◽  
Topotactic Transformation ◽  
Molecular Dimensions

Zeolites have attracted great interest over recent decades. Their unique pore structures of molecular dimensions and tunable compositions make them ideal for shape selective catalysis and separation. However, targeted synthesis of zeolites with new pore structures and compositions remains a key challenge. Here, we propose a novel approach based on a unique 3D-3D topotactic transformation, which takes advantage of weak bonding in zeolites. This is inspired by the structure transformation of PST-5, a new aluminophosphate molecular sieve, to PST-6 by calcination at 500 °C. The structure of PST-5 was determined from micrometer-sized crystals by 3D electron diffraction (3DED, also known as MicroED). We found that the 3D-3D topotactic transformation involves two types of building units where penta- or hexa-coordinated Al is present. We applied this approach to several other zeolite systems and predicted a series of new zeolite structures that would be synthetically feasible. This method provides a new concept for the synthesis of targeted zeolites, especially those which may not be feasible by conventional methods.

scholarly journals Ceramic-like stable CsPbBr3 nanocrystals encapsulated in silica derived from molecular sieve templates

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Qinggang Zhang ◽  
Bo Wang ◽  
Weilin Zheng ◽  
Long Kong ◽  
Qun Wan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Temperature ◽  
Hydrochloric Acid ◽  
Quantum Yield ◽  
Molecular Sieve ◽  
Green Phosphor ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield ◽  
Acid Aqueous Solution ◽  
Exceptional Stability

AbstractAchieving good stability while maintaining excellent properties is one of the main challenges for enhancing the competitiveness of luminescent perovskite CsPbX3 (X=Cl, Br, I) nanocrystals (NCs). Here, we propose a facile strategy to synthesize ceramic-like stable and highly luminescent CsPbBr3 NCs by encapsulating them into silica derived from molecular sieve templates at high temperature (600–900 oC). The obtained CsPbBr3-SiO2 powders not only show high photoluminescence quantum yield (~71%), but also show an exceptional stability comparable to the ceramic Sr2SiO4:Eu2+ green phosphor. They can maintain 100% of their photoluminescence value under illumination on blue light-emitting diodes (LEDs) chips (20 mA, 2.7 V) for 1000 h, and can also survive in a harsh hydrochloric acid aqueous solution (1 M) for 50 days. We believe that the above robust stabilities will significantly enhance the potential of perovskite CsPbX3 NCs to be practically applied in LEDs and backlight displays.

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