Copper (II) ions removal from aqueous solution using bentonite treated with ammonium chloride
Boukerroui Abdelhamid,
Ali Ourari,
Mohand Said Ouali
Issue:
Volume 1, Issue 1, December 2012
Pages:
1-10
Published:
30 December 2012
Abstract: A raw bentonite, obtained from Maghnia (Western Algerian) was impregnated into 1M ammonium chloride solution and thermally treated in a furnace at 200 °C during one hour. This treatment has improved its removal capacity of copper from aqueous solutions to about 30 %. The performances of the copper adsorption of this new material, after its physicochemical treatment, were evaluated by quantitative analysis on the copper remaining in the solution. The interface phenomena of bentonite- Cu2+ aqueous solution adheres to the Langmuir and Freundlich models. The adsorption energy, calculated by using Dubinin-Radushkevich equation, has proved that the removal of copper with this clay material is an ion exchange process. Nevertheless, the thermal treatment of this clay has inhibited the temperature effect on the retention of copper ions. Thus, the kinetic law governing the copper adsorption described here is following a second order model.
Abstract: A raw bentonite, obtained from Maghnia (Western Algerian) was impregnated into 1M ammonium chloride solution and thermally treated in a furnace at 200 °C during one hour. This treatment has improved its removal capacity of copper from aqueous solutions to about 30 %. The performances of the copper adsorption of this new material, after its physicoc...
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Sorption Studies on the Use of African Breadfruit (Treculia Africana) Seed Hull as Adsorbent for the Removal of Cu2+, Cd2+ and Pb2+ from Aqueous Solutions.
Christopher Uchechukwu Sonde,
Stevens Azubuike Odoemelam
Issue:
Volume 1, Issue 1, December 2012
Pages:
11-21
Published:
30 December 2012
Abstract: The sorption of Cu2+, Cd2+ and Pb2+ from aqueous solutions by unmodified (UBSH) and modified (MBSH) African breadfruit (Treculia africana) seed hull has been investigated. The amount of ions adsorbed by the hulls was dependent on the contact time range, 10 min – 120 min at optimum pH, 7.5 and temperature, 30 oC. Results revealed that the amount of metal ions adsorbed increased with time for both UBSH and MBSH, as well as a slight drop in the amount of Cd2+ adsorbed between contact time 60 min and 90 min for only UBSH. The rate of removal of the metal ions from their solutions was rapid, as appreciable amounts (96 % – 99 %) were adsorbed by the adsorbents at the least contact time (10 min) of the experiment. However, sorption capacity trend of the metal ions was Pb2+ > Cd2+ > Cu2+ for both UBSH and MBSH. Modification by thiolation of the adsorbent showed enhancement mainly in the sorption of Cu2+ and Cd2+ and a reduction for Pb2+ due to low affinity of Pb2+ for –SH groups. A comparison of kinetic models applied to the sorption process was evaluated for Pseudo-first order and Pseudo-second order models, with Pseudo-second order providing a better fit to the experimental data with high R2 values ranging 0.9999 to 1. McKay & Poot intraparticle diffusion model also pro-vided a good fit to the experimental data with more R2 values close to 1 than Weber & Morris model, thus suggesting the sorption process to be intraparticle diffusion controlled. Generally, the results from this study, indicates that a good adsor-bent can be obtained from both unmodified and thioglycollic acid-modified breadfruit seed hull.
Abstract: The sorption of Cu2+, Cd2+ and Pb2+ from aqueous solutions by unmodified (UBSH) and modified (MBSH) African breadfruit (Treculia africana) seed hull has been investigated. The amount of ions adsorbed by the hulls was dependent on the contact time range, 10 min – 120 min at optimum pH, 7.5 and temperature, 30 oC. Results revealed that the amount of ...
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Biochemical Metabolic Modelling Using Fuzzy Type-2.
Issue:
Volume 1, Issue 1, December 2012
Pages:
14-17
Published:
30 December 2012
Abstract: In his study a new approach, the use of fuzzy logic type-2 in modeling biochemical reactions is shown. In fact, each enzymatic reaction is modeled by means of a "sigmoid transfer function" relating input and output substrate concentrations. The slant of this function is adjusted using fuzzy type-2. This adjustment is conducted depending on the enzymatic reaction type (having activator/inhibitors or not). The obtained model seems promising in order to permit quantitative results to process data concerning adverse drugs reactions. In this paper it is also proved that by fuzzy type-2 logic, the performance characteristics of the modeling will be improved using the proposed method.
Abstract: In his study a new approach, the use of fuzzy logic type-2 in modeling biochemical reactions is shown. In fact, each enzymatic reaction is modeled by means of a "sigmoid transfer function" relating input and output substrate concentrations. The slant of this function is adjusted using fuzzy type-2. This adjustment is conducted depending on the enzy...
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