scholarly journals Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 2086 ◽  
Author(s):  
Qin Zhang ◽  
Muhan Chen ◽  
Lijiang Zhong ◽  
Qun Ye ◽  
Shaoshong Jiang ◽  
...  
Keyword(s):  
Quaternary Ammonium ◽  
Metal Organic Frameworks ◽  
Batch Studies ◽  
Metal Cyanide ◽  
Adsorption Capacities ◽  
Effective Removal ◽  
Highly Effective ◽  
Metal Organic ◽  
Cyanide Complexes ◽  
Removal Of Metal

In this study, quaternary-ammonium-functionalized metal–organic frameworks (MOFs) Et-N-Cu(BDC-NH2)(DMF), were prepared, characterized, and applied for the highly effective removal of metal cyanide complexes, including Pd(CN)42−, Co(CN)63−, and Fe(CN)63−. Batch studies were carried out, and the maximum adsorption capacities of Pd(II), Co(III), and Fe(III) reached 172.9, 101.0, and 102.6, respectively. Adsorption was rapid, and equilibrium was established within 30 min. Et-N-Cu(BDC-NH2)(DMF) exhibited high thermal and chemical stability. Furthermore, absorbed Pd(CN)42− was selectively recovered by two-step elution. First, Co(CN)63− and Fe(CN)63− were eluted with a 1.5 mol L−1 KCl solution. Elution rates of Co(CN)63− and Fe(CN)63− were greater than 98.0%, whereas the elution percentage of Pd(CN)42− was less than 2.0%. Second, >97.0% Pd(CN)42− on the loaded MOFs was eluted using a 2.0 mol L−1 KI solution. The recovery rate of Pd(CN)42− was greater than 91.0% after five testing cycles. Adsorption isotherms, kinetics models, and adsorption thermodynamics of Pd(CN)42− on Et-N-Cu(BDC-NH2) (DMF) were also systematically investigated. The Et-N-Cu(BDC-NH2) (DMF) absorbent exhibited a rapid, excellent ability for the adsorption of metal cyanide complexes.

scholarly journals Synthesis of metal–organic frameworks (MOFs) MIL-100(Fe) functionalized with thioglycolic acid and ethylenediamine for removal of eosin B dye from aqueous solution

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Adedibu C. Tella ◽  
Janet T. Bamgbose ◽  
Vincent O. Adimula ◽  
Mary Omotoso ◽  
Sunday E. Elaigwu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thioglycolic Acid ◽  
Metal Organic Frameworks ◽  
Thiol Group ◽  
Spectroscopic Techniques ◽  
Base Interaction ◽  
Adsorption Capacities ◽  
Melting Point Analysis ◽  
Eosin B ◽  
Metal Organic

AbstractThe interaction of eosin B dye from aqueous solution with MIL-100(Fe) and functionalized MIL-100(Fe) metal–organic frameworks (MOFs) is reported in this study. MIL-100(Fe) was prepared and functionalized with thioglycolic acid (TH) and ethylenediammine (ED) separately by incorporating the thiol (–SH) and the amine (–NH2) group of the functionalizing agents into the open metal sites of the MIL-100(Fe) to obtain the acidic (TH-MIL-100) and basic (ED-MIL-100) forms of the MOF respectively. Characterization of the MOFs was done by melting point analysis, elemental analysis, spectroscopic techniques, scanning electron microscopy (SEM), and powdered X-ray diffraction (PXRD) analysis. The adsorption experiments were carried out at different conditions such as pH, adsorbent dosage, contact time, temperature, and initial concentration of the dye to estimate the optimum conditions and the maximum adsorption capacities. Adsorption capacities were observed to increase in the order of ED-MIL-100 < MIL-100 < TH-MIL-100, while the TH-MIL-100 was the most effective in the removal process due to acid–base interaction between the acidic thiol group (–SH) and the alkaline medium of eosin B dye solution. The Langmuir Isotherm was seen to fit well to adsorption data obtained for all three adsorbent materials studied, and adsorption processes followed the pseudo-second order kinetics. This study, therefore, indicates the suitability of functionalization of MIL-100(Fe) towards improving its adsorption capacity.

The difference in CO2 adsorption capacities of different functionalized pillar-layered metal-organic frameworks (MOFs)

2021 ◽  
Author(s):  
Xiang-Jing Gao ◽  
Hegen Zheng
Keyword(s):  
Co2 Adsorption ◽  
Metal Organic Frameworks ◽  
Co2 Concentration ◽  
Fossil Energy ◽  
Adsorption Capacities ◽  
Metal Organic ◽  
The Difference

The excessive use of fossil energy has caused the CO2 concentration in the atmosphere to increase year by year. MOFs are ideal CO2 adsorbents that can be used in CO2...

scholarly journals Performance of metal–organic frameworks for the adsorptive removal of potentially toxic elements in a water system: a critical review

RSC Advances ◽  
2019 ◽  
Vol 9 (59) ◽  
pp. 34359-34376 ◽  
Author(s):  
Sammani Ramanayaka ◽  
Meththika Vithanage ◽  
Ajit Sarmah ◽  
Taicheng An ◽  
Ki-Hyun Kim ◽  
...  
Keyword(s):  
Partition Coefficient ◽  
Critical Review ◽  
Toxic Elements ◽  
Metal Organic Frameworks ◽  
Water System ◽  
Potentially Toxic Elements ◽  
Adsorptive Removal ◽  
System A ◽  
Adsorption Capacities ◽  
Metal Organic

This review examines the performance of metal–organic frameworks based on partition coefficient data over the classic maximum adsorption capacities.

Hierarchically porous metal–organic frameworks: rapid synthesis and enhanced gas storage

Soft Matter ◽  
2018 ◽  
Vol 14 (47) ◽  
pp. 9589-9598 ◽  
Author(s):  
Chongxiong Duan ◽  
Hang Zhang ◽  
Feier Li ◽  
Jing Xiao ◽  
Shaojuan Luo ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Gas Storage ◽  
Organic Amine ◽  
Rapid Synthesis ◽  
Hierarchically Porous ◽  
Adsorption Capacities ◽  
Metal Organic ◽  
Diffusion Rates ◽  
Enhanced Adsorption

A simple, rapid and versatile method was developed to increase the pore sizes and pore volumes of microporous MOFs (HKUST-1, ZIF-8, ZIF-67, and ZIF-90) by employing organic amine as the template. The resultant hierarchically porous HKUST-1 exhibited significantly enhanced adsorption capacities and faster diffusion rates for CH4 and CO2 gas storage.

scholarly journals Effective removal of chemical warfare agent simulants using water stable metal–organic frameworks: mechanistic study and structure–property correlation

RSC Advances ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 6691-6696 ◽  
Author(s):  
P. Asha ◽  
Mekhola Sinha ◽  
Sukhendu Mandal
Keyword(s):  
Aqueous Medium ◽  
Metal Organic Frameworks ◽  
Chemical Warfare Agent ◽  
Chemical Warfare ◽  
Mechanistic Study ◽  
Structure Property ◽  
Adsorptive Removal ◽  
Property Correlation ◽  
Effective Removal ◽  
Metal Organic

Water stable zirconium based MOFs are used for the efficient adsorptive removal of chemical warfare agent simulants from aqueous medium.

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