Removal of metal-cyanide complexes and recovery of Pt(II) and Pd(II) from wastewater using an alkali–tolerant metal-organic resin

2020 ◽  
pp. 124315
Author(s):  
Muhan Chen ◽  
Shunling Li ◽  
Ci Jin ◽  
Min Shao ◽  
Zhangjie Huang ◽  
...  
Keyword(s):  
Metal Cyanide ◽  
Metal Organic ◽  
Cyanide Complexes ◽  
Removal Of Metal ◽  
Organic Resin

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 Two-Step Elution Recovery of Cyanide Platinum Using Functional Metal Organic Resin

Molecules ◽  
2019 ◽  
Vol 24 (15) ◽  
pp. 2779 ◽  
Author(s):  
Muhan Chen ◽  
Qun Ye ◽  
Shaosong Jiang ◽  
Min Shao ◽  
Ci Jin ◽  
...  
Keyword(s):  
Noble Metals ◽  
Thiol Groups ◽  
Structure And Property ◽  
Metal Cyanide ◽  
Exchange Adsorption ◽  
Metal Organic ◽  
Pseudo Second Order ◽  
Cyanide Complexes ◽  
Organic Resin ◽  
Adsorption Desorption

A novel functional ion-exchange/adsorption metal organic resin (MOR), TEBAC-HKUST-1, was prepared and characterized. Ethanedithiol was used as the grafting agent to introduce thiol groups onto HKUST-1, and 4-vinylbenzyl chloride was then grafted onto SH-HKUST-1 using thiol groups. Finally, the quaternary ammonium functional group was immobilized onto the carrier by performing a quaternization reaction. The structure and property of TEBAC-HKUST-1 MOR were characterized by TGA, N2 adsorption–desorption, FTIR, SEM, and XRD. TEBAC-HKUST-1 MOR was used to remove metal cyanide complexes from wastewater. The adsorption was rapid, and the metal cyanide complexes including Pt(CN)42−, Co(CN)63−, Cu(CN)32−, and Fe(CN)63− were removed in 30 min. TEBAC-HKUST-1 MOR exhibited a high stability in neutral and weak basic aqueous solutions. Furthermore, Pt(II) could be efficiently recovered through two-step elution. The recovery rate of Pt(II) for five cycles were over 92.0% in the mixture solution containing Pt(CN)42−, Co(CN)63−, Cu(CN)32−, and Fe(CN)63−. The kinetic data were best fitted with the pseudo second-order model. Moreover, the isothermal data were best fitted with the Langmuir model. The thermodynamic results show that the adsorption is a spontaneous and exothermic process. TEBAC-HKUST-1 MOR not only exhibited excellent ability for the rapid removal of metal cyanide complexes, but also provided a new idea for the extraction of noble metals from cyanide-contaminated water.

Highly active double metal cyanide complexes: Effect of central metal and ligand on reaction of epoxide/CO2

2007 ◽  
Vol 18 (7) ◽  
pp. 887-890 ◽  
Author(s):  
Xing Hong Zhang ◽  
Shang Chen ◽  
Xian Ming Wu ◽  
Xue Ke Sun ◽  
Fei Liu ◽  
...  
Keyword(s):  
Central Metal ◽  
Metal Cyanide ◽  
Highly Active ◽  
Cyanide Complexes

scholarly journals Bacterial Consortiums Able to Use Metal-Cyanide Complexes as a Nitrogen Source

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1284
Author(s):  
María Isabel Igeño ◽  
Daniel Macías ◽  
María Isabel Guijo ◽  
Rubén Sánchez-Clemente ◽  
Ana G. Población ◽  
...  
Keyword(s):  
Nitrogen Source ◽  
Industrial Effluents ◽  
Free Form ◽  
Bacterial Strains ◽  
Pseudomonas Pseudoalcaligenes ◽  
Metal Cyanide ◽  
Biodegradation Process ◽  
Cyanide Complexes ◽  
Cyano Compounds

Most cyanide-containing industrial effluents also contain other cyano-derivatives and high amounts of metals and metal-cyanide compounds. For this reason, the biotreatment of these wastes requires the use of microorganisms capable to degrade all these different cyano-compounds and to tolerate metals. Pseudomonas pseudoalcaligenes CECT 5344 is a cyanotrophic bacterium capable of metabolize cyanide in its free form, but it is not very efficient at degrading metal-cyanide complexes. Therefore, for the optimization of the cyanide biodegradation process it is essential to find and characterize new bacterial strains, capable of assimilating metal cyanide-complexes, to complement the capacities of P. pseudoalcaligenes CECT 5344.

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