Research Article
Use of Zircon in the Physicochemical Process of Defluorination of Hyperfluorinated Brackish Water from the Diouroup Borehole (Senegal)
Alioune Ly*
,
Anabilaye Moussa Coly,
Ndiouga Camara,
Baba Ngom,
Diadioly Gassama,
Séni Tamba
Issue:
Volume 12, Issue 4, August 2024
Pages:
63-72
Received:
1 June 2024
Accepted:
17 June 2024
Published:
2 July 2024
Abstract: In phosphate-producing countries (United States, Commonwealth of Independent States, North and West Africa including Senegal), the presence of phosphate ores (hydroxyapatite) is often associated with that of fluorine ores (fluoro apatite). In these regions, water from confined aquifers may have excessive fluoride contents. While the potability standards in tropical climates are 0.7 mg/L at a temperature of 25°C In the central zone of Senegal, hyperfluorinated brackish water constitutes a public health problem. It is in this context that it was decided to make our contribution to the purification of drinking water in this area. In our study, we used as an element in the physicochemical defluorination process. The results obtained, by this physicochemical treatment by filtration on the zircon column, showed overall a reduction in fluoride contents of 67.55% (i.e. from 6.41 mg/L to 2.08 mg/L) in chlorides of 10.44%. We can therefore affirm that zircon can be used for the defluorination of hyperfluorinated brackish waters. However, these results can be improved by lowering the pH of the water before treatment and increasing the retention time.
Abstract: In phosphate-producing countries (United States, Commonwealth of Independent States, North and West Africa including Senegal), the presence of phosphate ores (hydroxyapatite) is often associated with that of fluorine ores (fluoro apatite). In these regions, water from confined aquifers may have excessive fluoride contents. While the potability stan...
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Research Article
Adsorption Studies of Pb2+, Cu2+ and Cr3+ from Aqueous Solution Using Azadirachta Indica (Neem) Seed Husk and Adansonia Digitata (Baobab) Seeds
Nasiru Pindiga Yahaya*,
Yahaya Aliyu Saad,
Adamu Abubakar
Issue:
Volume 12, Issue 4, August 2024
Pages:
73-85
Received:
12 June 2024
Accepted:
10 July 2024
Published:
27 August 2024
DOI:
10.11648/j.sjc.20241204.12
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Abstract: The adsorption of Pb2+, Cu2+ and Cr3+ from aqueous solution using Neem seed husk (NSH) and baobab seed (BS) were studied through the use of batch adsorption system. The adsorbents were prepared by drying at 120°C for 24hours and were characterized using FT-IR, XRD, and SEM analysis. The FTIR spectroscopy revealed the presence of O-H, N-H, C-H, C=C, C=O, and C-O stretching; XRD revealed the particle sizes as 44.51nm for NSH and 42.61nm while the morphology of the NSH and BS were revealed by SEM to be porous for NSH and BS. Various parameters such as, initial metal ion concentration, adsorbent dosage, contact time, Temperature and pH of metal ion solution were investigated in a batch-adsorption System. The adsorption uptake was found to increase with increase in adsorbent dose, contact time and temperature but decreases with the initial concentration. The uptake of the metal ions increases and reaches optimum at pH of 4-6. The maximum adsorption capacity was found to be Pb-NSH (15.267mg/g) and Cu-NSH (19.46mg/g). Adsorption of Cu2+onto NSH fitted Langmuir isotherm model with (R2 > 0.93) while Adsorption of Pb-NSH Fitted Freundlich isotherm Model with (R2> 0.99). Kinetic data fitted pseudo-second-order model (R2 > 0.98) which was more suitable in explaining the adsorption rate. Thermodynamic data showed that Gibb’s free energy (ΔG°) values for all metal ions were negative indicating feasibility and favorability of adsorption. Positive enthalpy change (ΔH°) and Entropy change (ΔS°) values indicate endothermic processes and increase in randomness.
Abstract: The adsorption of Pb2+, Cu2+ and Cr3+ from aqueous solution using Neem seed husk (NSH) and baobab seed (BS) were studied through the use of batch adsorption system. The adsorbents were prepared by drying at 120°C for 24hours and were characterized using FT-IR, XRD, and SEM analysis. The FTIR spectroscopy revealed the presence of O-H, N-H, C-H, C=C,...
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