Optimized Activation of Bentonite for Adsorption of Magnesium and Cadmium from Phosphoric Acid
Béchir Khoualdia,
Mouna Loungou,
Elimame Elaloui
Issue:
Volume 3, Issue 4, December 2018
Pages:
83-91
Received:
14 June 2018
Accepted:
4 July 2018
Published:
26 February 2019
DOI:
10.11648/j.wjac.20180304.11
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Abstract: The adsorption of magnesium (II) and cadmium (II) from industrial phosphoric acid onto 4 samples of clays: crude (a), purified (b), activated (c) and purified-activated (d) bentonite have been studied using a batch adsorber. The parameters that affect the magnesium (II) and cadmium (II) adsorption, such as bentonite amount, temperature, contact time and solution pH have been investigated and optimized conditions determined (bentonite amount 12g/ 100mL of industrial phosphoric acid; temperature 293.15 K; contact time 15 min; pH 1.78±0.1). The loading capacity values were found respectively to be 51.21%and 56.25% for magnesium and cadmium using the purified-activated bentonite.
Abstract: The adsorption of magnesium (II) and cadmium (II) from industrial phosphoric acid onto 4 samples of clays: crude (a), purified (b), activated (c) and purified-activated (d) bentonite have been studied using a batch adsorber. The parameters that affect the magnesium (II) and cadmium (II) adsorption, such as bentonite amount, temperature, contact tim...
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Investigation on Kinetics and Mechanism of Metal Exchange Reaction of Copper (II) Ions and NiL
Seyed Alireza Hashemi,
Rasoul Vafazadeh
Issue:
Volume 3, Issue 4, December 2018
Pages:
92-98
Received:
29 October 2018
Accepted:
28 November 2018
Published:
13 March 2019
DOI:
10.11648/j.wjac.20180304.12
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Abstract: In this study, the electron spectrum in UV-Vis region is used to study the kinetics of metal exchange reaction between ion cu2+ and additional concentration of NiL complex. This complex is soluble in dimethyl formamid solution with ionic strength of 0.1M KNO3. The kinetic data of this reaction proves that the metal exchange is a two-step reaction. The value of the kinetic constant, k, is proportional with [NiL] at low concentration of NiL. At higher higher concentration of NiL ([NiL]>>[Cu2+]), this direct relation does not exist, so k is independent of [NiL]. The second order reaction is converted to pseudo first order reaction with the rate constant of kobs. Based on the experimental data, the values of kobs are computed. Then kobs is expressed as a function of [NiL]. According to these results, the mechanism of metal exchange reaction is suggested.
Abstract: In this study, the electron spectrum in UV-Vis region is used to study the kinetics of metal exchange reaction between ion cu2+ and additional concentration of NiL complex. This complex is soluble in dimethyl formamid solution with ionic strength of 0.1M KNO3. The kinetic data of this reaction proves that the metal exchange is a two-step reaction. ...
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