scholarly journals Metal ion-induced separation of valuable organic acids from a depolymerized mixture of lignite without using organic solvents

RSC Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3479-3486
Author(s):  
Jianxiu Hao ◽  
Limin Han ◽  
Keli Yang ◽  
Hongye Zhao ◽  
Xiaomin Li ◽  
...  
Keyword(s):  
Organic Acids ◽  
Organic Solvents ◽  
Metal Ion ◽  
Separation Process ◽  
Separation Selectivity ◽  
Tunable Separation

Metal ion-induced separation of valuable organic acids from complex lignite depolymerized mixtures was proposed and proved to be an efficient, green, and facile separation process with easily tunable separation selectivity.

scholarly journals SEPARATION OF CHROM (VI) FROM ELECTROPLATING WASTE USING POLYMER INCLUSION MEMBRANE (PIM) METHOD

2017 ◽  
Vol 13 (1) ◽  
pp. 119 ◽  
Author(s):  
Muhammad Cholid Djunaidi ◽  
Khabibi Khabibi ◽  
Rizka Nurfitriana
Keyword(s):  
Metal Ion ◽  
Membrane Surface ◽  
Separation Process ◽  
Ion Concentration ◽  
Aliquat 336 ◽  
Nacl Solution ◽  
Chromium Ion ◽  
Chromium Vi ◽  
Base Polymer ◽  
Feed Phase

<p><span lang="EN-US">Research of chromium (VI) separation has been done using </span><span lang="EN-US">p</span><span lang="EN-US">olymer </span><span lang="EN-US">i</span><span lang="EN-US">nclusion </span><span lang="EN-US">m</span><span lang="EN-US">embrane (PIM) method. This study aims to generate PIM, separate the metal ion chromium (VI) using PIM and determine the effect of the concentration of the feed phase, the thickness of the membrane and the amount of usage of the membrane for ion chromium (VI) diffusion.</span><span lang="EN-US">Polymer </span><span lang="EN-US">i</span><span lang="EN-US">nclusion </span><span lang="EN-US">m</span><span lang="EN-US">embrane (PIM) was made by mixing Aliquat 336-TBP as carrier compounds, PVC as the base polymer, DBE as a plasticizer and THF as a solvent. PIM membrane was placed between the source of analyte as a feed phase and result of the separation as a receiver phase. Feed phase was electroplating waste metal containing chromium (VI) at pH 4, while the receiver phase was a 2 N NaCl solution with a pH 6.7. </span>The change of v<span lang="EN-US">ariable</span>s<span lang="EN-US"> in this study </span>were<span lang="EN-US"> the concentration of the feed phase </span>at various dilution i.e.,<span lang="EN-US"> 100x, 50x and 10x, the thickness of the membrane i.e., 25 μm, 20 μm and 10 μm</span>,<span lang="EN-US"> and the </span>time of <span lang="EN-US">membrane</span> using i.e.,<span lang="EN-US"> 1, 2 and 3 times. The concentration of chromium (VI) diffused after separation process </span>was<span lang="EN-US"> analyzed </span>by <span lang="EN-US">a</span><span lang="EN-US">tomic </span><span lang="EN-US">a</span><span lang="EN-US">bsorption </span><span lang="EN-US">s</span><span lang="EN-US">pectroscopy (AAS). </span>T<span lang="EN-US">he stability of membrane was observed </span>by analyzing the presence of<span lang="EN-US"> membrane</span>’s<span lang="EN-US"> component </span>in the<span lang="EN-US"> feed</span> phase<span lang="EN-US"> and </span>in the <span lang="EN-US">receiver phase</span>. The analysis was conducted by UV-Vis <span lang="EN-US">spectrophotometry</span>. Meanwhile, s<span lang="EN-US">canning </span><span lang="EN-US">e</span><span lang="EN-US">lectron </span><span lang="EN-US">m</span><span lang="EN-US">icroscopy (SEM) </span>analysis was used <span lang="EN-US">to determine the morphology of membrane surface.</span><span lang="EN-US">The results showed that the chromium ion concentration </span>diffused<span lang="EN-US"> from the feed phase was 99.24</span><span lang="EN-US">%</span>, mean<span lang="EN-US">while the 85.88</span><span lang="EN-US">%</span> of it diffused to the receiving phase<span lang="EN-US">. The highest Cr(VI)</span> ions<span lang="EN-US"> diffus</span>ion was occured at<span lang="EN-US"> the first use of PIM membrane with a thickness of 10 μm and the concentration of the feed phase</span> was<span lang="EN-US"> 10.55 ppm</span> (resulted from 100 times dilution)<span lang="EN-US">. </span>Therefore, i<span lang="EN-US">t can be concluded that the diffusion of chromium (VI) ion was influenced by the concentration of feed phase, the thickness of membrane and </span>the number of membrane application<span lang="EN-US">.</span></p>

The Novel SO3H-Functionalized Ionic Liquids Promoted Synthesis of Xanthenedione Derivatives in Aqueous Media under Microwave Irradiation

2011 ◽  
Vol 391-392 ◽  
pp. 1354-1357 ◽  
Author(s):  
Bai Lin Li ◽  
Hua Ding Liang ◽  
Ai Guo Zhong ◽  
Dan Qian Xu
Keyword(s):  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Organic Solvents ◽  
Catalytic System ◽  
Aqueous Media ◽  
Environmentally Friendly ◽  
Separation Process ◽  
The Novel ◽  
Simple Operation

Novel SO3H-functionalized ionic liquids were successfully applied as catalysts for synthesis of xanthenediones under microwave irradiation in Aqueous. Various types of Xanthenes were provided in 90-97% yields using the catalytic system of [(HSO3-p)2im][CF3SO3]/H2O. The products could be conveniently separated from the reaction mixture by filtration and the dissolved catalyst could be reused without any treatment, which of the separation process was performed in water without using any organic solvents. The method not only has the adventages of shrot time and simple operation, but also is environmentally friendly.

Polarographic Study of the Electrode Reaction of Zn(II) in Formamide and Dimethylformamide

1975 ◽  
Vol 30 (5-6) ◽  
pp. 350-354 ◽  
Author(s):  
Sudhindra Swarup Sharma ◽  
Mukhtar Singh
Keyword(s):  
Kinetic Parameters ◽  
Organic Solvents ◽  
Metal Ion ◽  
Supporting Electrolyte ◽  
Electrode Reaction ◽  
Polarographic Study ◽  
Aqueous Mixtures ◽  
Diffusion Controlled ◽  
And Diffusion

The reduction of Zn(II) at the d.m.e. has been studied in aqueous mixtures of formamide and dimethylformamide. The general polarographic characteristics have been determined, using 0.1 M NaNO3 as the supporting electrolyte. The reduction of Zn(II) in these organic solvents is irreversible and diffusion controlled. The kinetic parameters, αna and kf,h have been calculated separately by KOTECKY and DELAHAY treatments. The change of polarographic characteristics and kinetic parameters is explained in terms of solvation of the metal ion in these solvents. The electrocapillary curves in the presence of these solvents have also been studied.

Synthesis of Oligobipyridine Strands Bearing Nucleoside and Amino Acid Side Chains

1996 ◽  
Vol 49 (10) ◽  
pp. 1023 ◽  
Author(s):  
MM Harding ◽  
JM Lehn
Keyword(s):  
Amino Acid ◽  
Nucleic Acids ◽  
Organic Solvents ◽  
Metal Ion ◽  
Metal Ion Complexation ◽  
Biological Targets ◽  
Complexation Studies ◽  
Amide Derivatives ◽  
Amino Acid Side Chains ◽  
Derivatives Of

The synthesis is reported of derivatives of 6,6'-dimethyl-2,2'-bipyridine in which adenosine, thymidine aid tryptophan substituents are introduced at the 4,4'-positions as amide derivatives. Artificial oligonucleoside strands derived from the corresponding trisbipyridyl ligand , in which three bipyridyl ligands are separated by methyleneoxy bridges, have been prepared. The solubility of the nucleoside-substituted ligands in organic solvents is poor, but acylation of the ribose or deoxyribose units present in the ligands provides a mechanism whereby organic solubility can be improved. These ligands may be used for the preparation of metallo-exoreceptors , with the potential for recognition of biological targets such as nucleic acids. Preliminary metal ion complexation studies have been carried out.

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