scholarly journals Dual-functional ionic porous organic framework for palladium scavenging and heterogeneous catalysis

Nanoscale ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 3967-3973
Author(s):  
Shun-Shun Qin ◽  
Ze-Kun Wang ◽  
Lei Hu ◽  
Xing-Hao Du ◽  
Zheng Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heterogeneous Catalysis ◽  
Ion Exchange ◽  
Exchange Process ◽  
Pd Nanoparticles ◽  
Coupling Reactions ◽  
Ion Exchange Process ◽  
Dual Functional ◽  
Porous Organic Framework ◽  
Organic Framework

The ionic covalent organic framework shows excellent scavenging ability towards [PdCl4]2− in aqueous solution via an ion exchange process. The loaded [PdCl4]2− can be further reduced into Pd nanoparticles for catalyzing Suzuki coupling reactions.

Removal of Toxic Dyestuffs from Aqueous Solution by Amphoteric Bioadsorbent

2020 ◽  
Vol 16 ◽  
Author(s):  
Reda M. El-Shishtawy ◽  
Abdullah M. Asiri ◽  
Nahed S. E. Ahmed
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Dye Removal ◽  
Exchange Process ◽  
Cationic Dyes ◽  
Carboxyl Groups ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Isotherm ◽  
Ion Exchange Process ◽  
Dyes And Pigments

Background: Color effluents generated from the production industry of dyes and pigments and their use in different applications such as textile, paper, leather tanning, and food industries, are high in color and contaminants that damage the aquatic life. It is estimated that about 105 of various commercial dyes and pigments amounted to 7×105 tons are produced annually worldwide. Ultimately, about 10–15% is wasted into the effluents of the textile industry. Chitin is abundant in nature, and it is a linear biopolymer containing acetamido and hydroxyl groups amenable to render it atmospheric by introducing amino and carboxyl groups, hence able to remove different classes of toxic organic dyes from colored effluents. Methods: Chitin was chemically modified to render it amphoteric via the introduction of carboxyl and amino groups. The amphoteric chitin has been fully characterized by FTIR, TGA-DTG, elemental analysis, SEM, and point of zero charge. Adsorption optimization for both anionic and cationic dyes was made by batch adsorption method, and the conditions obtained were used for studying the kinetics and thermodynamics of adsorption. Results: The results of dye removal proved that the adsorbent was proven effective in removing both anionic and cationic dyes (Acid Red 1 and methylene blue (MB)), at their respective optimum pHs (2 for acid and 8 for cationic dye). The equilibrium isotherm at room temperature fitted the Freundlich model for MB, and the maximum adsorption capacity was 98.2 mg/g using 50 mg/l of MB, whereas the equilibrium isotherm fitted the Freundlich and Langmuir model for AR1 and the maximum adsorption capacity was 128.2 mg/g. Kinetic results indicate that the adsorption is a two-step diffusion process for both dyes as indicated by the values of the initial adsorption factor (Ri) and follows the pseudo-second-order kinetics. Also, thermodynamic calculations suggest that the adsorption of AR1 on the amphoteric chitin is an endothermic process from 294 to 303 K. The result indicated that the mechanism of adsorption is chemisorption via an ion-exchange process. Also, recycling of the adsorbent was easy, and its reuse for dye removal was effective. Conclusion: New amphoteric chitin has been successfully synthesized and characterized. This resin material, which contains amino and carboxyl groups, is novel as such chemical modification of chitin hasn’t been reported. The amphoteric chitin has proven effective in decolorizing aqueous solution from anionic and cationic dyes. The adsorption behavior of amphoteric chitin is believed to follow chemical adsorption with an ion-exchange process. The recycling process for few cycles indicated that the loaded adsorbent could be regenerated by simple treatment and retested for removing anionic and cationic dyes without any loss in the adsorbability. Therefore, the study introduces a new and easy approach for the development of amphoteric adsorbent for application in the removal of different dyes from aqueous solutions.

Lanthanide cation encapsulated in a metal–organic framework as a white LED and selective naked-eye reversible HCl sensor

2019 ◽  
Vol 7 (10) ◽  
pp. 2880-2885 ◽  
Author(s):  
Huijun Li ◽  
Qingqing Li ◽  
Zhouqing Xu
Keyword(s):  
Ion Exchange ◽  
White Light ◽  
Metal Organic Framework ◽  
Exchange Process ◽  
White Led ◽  
Light Emitting ◽  
Naked Eye ◽  
Ion Exchange Process ◽  
Metal Organic ◽  
Organic Framework

A prepared anionic HPU-14, which was employed as a platform for loading green-emitting Tb3+ and red-emitting Eu3+ into nanotube channels of the blue-emitting MOF via an ion-exchange process, is suitable for white light-emitting LED devices and enables the sensitive colorimetric reversible detection of gaseous HCl.

Studies on Cadmium Uptake by Hydroxyapatite

2007 ◽  
Vol 330-332 ◽  
pp. 123-126 ◽  
Author(s):  
Nilce C.C. da Rocha ◽  
Elena Mavropoulos ◽  
Marcelo Henrique Prado da Silva ◽  
R. C. de Campos ◽  
Antonella M. Rossi
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Exchange Process ◽  
Cadmium Uptake ◽  
Main Mechanism ◽  
Solution Ph ◽  
Time Intervals ◽  
Ion Exchange Process

Cadmium uptake by hydroxyapatite from aqueous solution was studied in time intervals between 2 minutes and 96 hours, using different Cd2+ concentrations (21 to 768 mg L-1). The solution pH after Cd2+ uptake was assessed. Dissolution experiments at fixed pH were performed in order to evaluate the ion exchange process. Cd2+sorption by hydroxyapatite is fast and it happens simultaneously by different mechanisms. Ion exchange is the main mechanism, where mechanism Cd2+ present in aqueous solution replaces Ca2+ from hydroxyapatite structure.

A new microporous anionic metal–organic framework as a platform for highly selective adsorption and separation of organic dyes

2015 ◽  
Vol 3 (4) ◽  
pp. 1675-1681 ◽  
Author(s):  
Yuan-Chun He ◽  
Jin Yang ◽  
Wei-Qiu Kan ◽  
Hong-Mei Zhang ◽  
Ying-Ying Liu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Organic Dyes ◽  
Selective Adsorption ◽  
Metal Organic Framework ◽  
Exchange Process ◽  
Ion Exchange Process ◽  
Metal Organic ◽  
Organic Framework

In this work, we report a new microporous negatively charged metal–organic framework, and its utilization as a platform for the highly selective adsorption and separation of organic dyes through an ion-exchange process.

Chromate ion-exchange process at alkaline pH

1986 ◽  
Vol 20 (9) ◽  
pp. 1177-1184 ◽  
Author(s):  
Arup K. Sengupta ◽  
Dennis Clifford ◽  
Suresh Subramonian
Keyword(s):  
Ion Exchange ◽  
Exchange Process ◽  
Alkaline Ph ◽  
Ion Exchange Process ◽  
Chromate Ion

The Application of ß“-Alumina As A Solid State Laser Host

1985 ◽  
Vol 60 ◽  
Author(s):  
J. D. Barrie ◽  
D. L. Yang ◽  
B. Dunn ◽  
O. M. Stafsudd
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
Ion Exchange ◽  
Exchange Process ◽  
Laser Action ◽  
Solid State Laser ◽  
Host Crystal ◽  
State Laser ◽  
Ion Exchange Process ◽  
Single Host

AbstractIon exchanged ß“-aluminas display a number of interesting optical properties which suggest that the material is well suited for application as a solid state laser host. Small platelets of Nd3+ Ion exchanged β“-alumina exhibit laser action with gain coefficients many times greater than YAG. The versatility of the ion exchange process enables one to form a wide variety of compounds with different active ions and concentrations, thereby allowing the study of many different effects within a single host crystal.

Removal of Se(VI) from Raw Water by Ion Exchange Process

2012 ◽  
Vol 430-432 ◽  
pp. 941-948 ◽  
Author(s):  
Yong Sheng Shi ◽  
Yu Zhen Shi ◽  
Lin Wang
Keyword(s):  
Ion Exchange ◽  
Removal Rate ◽  
Exchange Process ◽  
Selenium Concentration ◽  
Quality Standard ◽  
Raw Water ◽  
Strong Base ◽  
Ion Exchange Process ◽  
Efficiency Cost ◽  
Easy Operation

Studies have been carried out on removal of Se(Ⅵ) from raw water by ion exchange process. The experiment results indicate that employment of strong-base anion exchange resin of 201×7 can receive a desirable result for Se removal. It is particularly true that the removal rate of Se(Ⅵ) can achieve more than 96% when the Se(Ⅵ) concentration in raw water is 100μg/L. This allows selenium concentration of the supply water in full conformity to the quality standard currently available for drinking water. Ion exchange process for Se removal has been proved to be competent for its efficiency, cost effectiveness and easy operation.

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