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Chemical Science International Journal
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This is an Open Access Journal

Open Access journal
ISSN (Online) 2456-706X
Published by SCIENCEDOMAIN international

[66 journals]

The Removal of Sulfamonomethoxine (SMM) with Copper Oxide/Zirconium
Dioxide (CuO/ZrO2) Nanocomposites by Photocatalytic Degradation in
Pharmaceutical Industry Wastewaters and the Evaluation of Microtox
(Aliivibrio fischeri) and Daphnia magna Acute Toxicity Assays
- Authors: Rukiye Öztekin, Delia Teresa Sponza
  Pages: 1 - 26
  Abstract: In this study, Copper oxide/zirconium dioxide (CuO/ZrO2) nanocomposites (NCs) as a photocatalys was examined during photocatalytic degradation process (PDP) in the efficient removal of Sulfamonomethoxine (SMM) from pharmaceutical industry wastewater (PI ww) plant, İzmir, Turkey. Different pH values (3.0, 4.0, 7.0, 9.0, 10.0 and 12.0), increasing SMM concentrations (5, 10, 20 and 40 mg/l), increasing CuO/ZrO2 NCs concentrations (100, 200, 400, 800 and 1000 mg/l), different CuO/ZrO2 NCs mass ratios (1/2, 2/3, 3/4, 4/4, 4/3, 3/2, 2/1), increasing recycle times (1., 2., 3., 4., 5., 6. and 7.) was operated during PDP in the efficient removal of SMM in PI ww. The characteristics of the synthesized nanoparticles (NPs) were assessed using XRD, DRS, FESEM, EDX, FTIR, TEM and XPS analyses, respectively. The acute toxicity assays were operated with Microtox (Aliivibrio fischeri also called Vibrio fischeri) and Daphnia magna acute toxicity tests. The photocatalytic degradation mechanisms of CuO/ZrO2 NCs and the reaction kinetics of SMM were evaluated in PI ww during PDP. Cost analysis was evaluated for SMM removal with CuO/ZrO2 NCs by PDP in PI ww. ANOVA statistical analysis was used for all experimental samples. Maximum 99.6% SMM removal was obtained during PDP in PI ww, at 350 W UV-vis light irradiation power, at 147 mW/cm2 light intensity, after 120 min, at pH=12.0 and at 25oC, respectively. Maximum 99.2% SMM removal was found with PDP in PI ww, at 5 mg/l SMM, at 350 W UV-vis, at 147 mW/cm2, after 120 min, at pH=12.0 and at 25oC, respectively. Maximum 99.5% SMM removal was measured to 800 mg/l CuO/ZrO2 NCs with PDP in PI ww, at 5 mg/l SMM, at 350 W UV-vis, at 147 mW/cm2, after 120 min, at pH=12.0 and at 25oC, respectively. Maximum 99.4% SMM removal was measured at 4/3wt CuO/ZrO2 NCs mass ratios, at 5 mg/l SMM, at 800 mg/l CuO/ZrO2 NCs, at 350 W UV-vis, at 147 mW/cm2, after 120 min, at pH=12.0 and at 25oC, respectively. Maximum 99.5% SMM recovery was measured in PI ww during PDP, after 1. recycle time, at 5 mg/l SMM, at 800 mg/l CuO/ZrO2 NCs, at 4/3wt CuO/ZrO2 NCs mass rartio, at 350 W UV-vis, at 147 mW/cm2, after 120 min, at pH=12.0 and at 25oC, respectively. 97.31% maximum Microtox acute toxicity removal was found in SMM=20 mg/l after 180 min, and at 60oC. It was observed an inhibition effect of SMM=40 mg/l to Microtox after 180 min, and at 60oC. 93.27% maximum Daphnia magna acute toxicity removal was obtained in SMM=20 mg/l after 180 min, and at 60oC, respectively. It was obtained an inhibition effect of SMM=40 mg/l to Daphnia magna after 180 min and at 60oC. As a result, the CuO/ZrO2 NCs during PDP in PI ww was stable in harsh environments such as acidic, alkaline, saline and then was still effective process. Finally, the combination of a simple, easy operation preparation process, excellent performance and cost effective, makes this CuO/ZrO2 NCs a promising option during PDP in PI ww treatment.
  PubDate: 2023-05-08
  DOI: 10.9734/CSJI/2023/v32i2845
  Issue No: Vol. 32, No. 3 (2023)
Isolation, Characterization and Evaluation of the Antioxidant Potential of
Different Extracts and Biomolecules of the Roots of Paullinia pinnata
(Sapindaceae)
- Authors: Adjadi Jeanne Bervis, Kassi Amian Brise Benjamin , Ballo Daouda, Seri Seri Chardin , Virieux David , Pirat Jean-Luc, Soro Yaya , Danho Doubou , Adjou Ané
  Pages: 27 - 43
  Abstract: Cardiovascular diseases, which are now among the leading causes of death in the world, are increasingly prompting the search for new antioxidant remedies. It is in this context that the chemical study and evaluation of the antioxidant potential of the different extracts of Paullinia pinnata (Sapindaceae), a plant used in the traditional treatment of cardiovascular diseases was carried out. The assessment of antioxidant potential was carried out by the ABTS free radical scavenging method. Phytochemical study of extracts (ethyl acetate and aqueous) of Paullinia pinnata roots isolated epicatechin, laproanthocyanidin A-2, epicatechin-(2β→O→7, 4β→8)-epicatechin-(4β→8)-epicatechin (cinnamtannin B-1) and O-β-D-glucopyranosyloxy-4-methyl-2(5H)-furanone. These compounds were first isolated from the genus Paullinia pinnata from Côte d'Ivoire. Their structures are elucidated by spectroscopic analyses (NMR and MS) in comparison with data from the literature.
  PubDate: 2023-05-24
  DOI: 10.9734/CSJI/2023/v32i3846
  Issue No: Vol. 32, No. 3 (2023)
Electrochemical Investigation of the Anti-corrosive Effect of Spondias
mombin Leaves Extract on the Corrosion of Aluminium Alloy (AA2024) and
Mild Steel in 0.5 M NaCl
- Authors: Kalu D. Ogwo , Lebe A. Nnanna , Ugomma C. Onyeije , A. D. Asiegbu
  Pages: 44 - 51
  Abstract: The inhibiting effect of Spondias mombin (SM) leaves extract on the corrosion of AA2024 and mild steel in 0.5 M NaCl environment was investigated using electrochemical techniques. Tafel plots obtained from the potentiodynamic polarization (PDP) experiments indicate that for both metals, the curves shifted toward more negative values of the corrosion current density (Icorr) as the inhibitor concentration increased. More so, for all concentrations of the inhibitor, the values of maximum displacement shift in corrosion potential (Ecorr) were found to be less than 85 mV. This shows that SM behaves like a mixed-type corrosion inhibitor. The electrochemical impedance spectroscopy (EIS) study shows that for both metals, the charge transfer resistance (Rct) values increased with an increase in concentration of the inhibitor. The increase in values of Rct can be attributed to the formation of protective film at the metal-solution interface. The Nyquist plots show semi circles whose diameter increased as the inhibitor concentration is increased and this is suggestive of retardation in corrosion process. The inhibition efficiency values obtained in the EIS experiment were found to be in close conformity with those of the PDP experiment.
  PubDate: 2023-05-31
  DOI: 10.9734/CSJI/2023/v32i3847
  Issue No: Vol. 32, No. 3 (2023)