Solvent extraction of chromium(VI) from base metal ions with diphenyl-2-pyridylmethane as a liquid anion exchanger

1978 ◽  
Vol 43 (1) ◽  
pp. 199-207 ◽  
Author(s):  
M. Iqbal ◽  
M. Ejaz
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Base Metal ◽  
Anion Exchanger ◽  
Chromium Vi

scholarly journals Extraction behavior of Cr(VI) and coexistence with interfering ions by trialkylamine

2015 ◽  
Vol 5 (4) ◽  
pp. 494-504 ◽  
Author(s):  
Yingxue Li ◽  
Chongwei Cui
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Tertiary Amine ◽  
Hollow Fiber ◽  
Inorganic Phosphorus ◽  
Bonding Force ◽  
Adsorption Sites ◽  
Chromium Vi ◽  
Extraction Behavior ◽  
Interfering Ions

Solvent extraction of chromium(VI) with trialkylamine (N235) using kerosene/n-heptane as the diluent was investigated. The basic conditions for Cr(VI) extraction have been explored, and the influence of coexisting contaminants on extraction has been evaluated. The results indicated that the separation of Cr(VI) could be realized with N235, and the recovery rate could be increased by adding organophosphorus-tributyl phosphate as the modifier due to the strong bonding force of synergistic extraction. However, the inorganic phosphorus could inhibit the chemical reaction between tertiary amine and Cr(VI) ions owning to the competition of the limited adsorption sites. Besides, inorganic anions such as massive SO42− and NO3− could inhibit extraction of metal ions because of competition coordination. In addition, the separation of Cr(VI) from coexisting metal ions could be achieved with trialkylamine except Fe2+ due to its reducibility. Based on the results, the feasibility of pseudo-emulsion based hollow fiber strip dispersion used for separation and recovery of Cr(VI) has been evaluated, and the transport properties of Cr(VI) and coexistence with interfering ions have been explored.

Revisiting the passivation of stainless steels and other passive CRAs

2018 ◽  
Vol 106 (1) ◽  
pp. 107 ◽  
Author(s):  
Jean- Louis Crolet
Keyword(s):  
Electrical Conductivity ◽  
Metal Ions ◽  
Base Metal ◽  
Stainless Steels ◽  
Electronic Conductivity ◽  
Transport Processes ◽  
General Knowledge ◽  
Inorganic Polymers ◽  
Faraday Cage

All that was said so far about passivity and passivation was indeed based on electrochemical prejudgments, and all based on unverified postulates. However, due the authors’ fame and for lack of anything better, the great many contradictions were carefully ignored. However, when resuming from raw experimental facts and the present general knowledge, it now appears that passivation always begins by the precipitation of a metallic hydroxide gel. Therefore, all the protectiveness mechanisms already known for porous corrosion layers apply, so that this outstanding protectiveness is indeed governed by the chemistry of transport processes throughout the entrapped water. For Al type passivation, the base metal ions only have deep and complete electronic shells, which precludes any electronic conductivity. Then protectiveness can only arise from gel thickening and densification. For Fe type passivation, an incomplete shell of superficial 3d electrons allows an early metallic or semimetallic conductivity in the gel skeleton, at the onset of the very first perfectly ordered inorganic polymers (- MII-O-MIII-O-)n. Then all depends on the acquisition, maintenance or loss of a sufficient electrical conductivity in this Faraday cage. But for both types of passive layers, all the known features can be explained by the chemistry of transport processes, with neither exception nor contradiction.

scholarly journals Sorption of chromium (VI) from electroplating rinse water by strong base anion exchanger: equilibrium and kinetic studies

2021 ◽  
Vol 1913 (1) ◽  
pp. 012076
Author(s):  
Prasanna S Koujalagi ◽  
Harish N Revankar ◽  
Raviraj M Kulkarni ◽  
Vijayendra R Gurjar
Keyword(s):  
Anion Exchanger ◽  
Kinetic Studies ◽  
Strong Base ◽  
Chromium Vi ◽  
Rinse Water

Why do zeolites induce an unprecedented electronic state on exchanged metal ions?

2017 ◽  
Vol 19 (36) ◽  
pp. 25105-25114 ◽  
Author(s):  
Akira Oda ◽  
Takahiro Ohkubo ◽  
Takashi Yumura ◽  
Hisayoshi Kobayashi ◽  
Yasushige Kuroda
Keyword(s):  
Metal Ions ◽  
Electronic State ◽  
Base Metal ◽  
Metal Ion ◽  
High Efficiency ◽  
Lewis Base ◽  
Mfi Zeolite ◽  
Adsorption Processes ◽  
Exact Position

Understanding the exact position and the detailed role of the Al array in zeolites is essential for elucidating the origin of unique properties and for designing zeolite materials with high efficiency in catalytic and adsorption processes. In this work, we advanced pivotal roles of Lewis base–metal ion bifunctionality caused by Al atoms arrayed circumferentially in the MFI-zeolite pores.

Solvent Extraction of Chromium(VI) with Tri-n-butyl Phosphate from Aqueous Acidic Solutions

2007 ◽  
Vol 52 (6) ◽  
pp. 2220-2223 ◽  
Author(s):  
Weidong Zhang ◽  
Junteng Liu ◽  
Zhongqi Ren ◽  
Changshun Du ◽  
Jingnan Ma
Keyword(s):  
Solvent Extraction ◽  
Acidic Solutions ◽  
Chromium Vi

scholarly journals Oxidation of metal ions during solvent extraction of manganese(II) with benzoylacetone and dibenzoylmethane.

1990 ◽  
Vol 6 (1) ◽  
pp. 115-119 ◽  
Author(s):  
Tatsuya SEKINE ◽  
Takahiro ISHII ◽  
Tadahiro FUKAYA
Keyword(s):  
Solvent Extraction ◽  
Metal Ions
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