Rapid adsorption of some heavy metals using extracted chitosan anchored with new aldehyde to form a schiff base

Sharef, Huda Y; Fakhre, Nabil A.

doi:10.1371/journal.pone.0274123

Cited by 6 publications

(5 citation statements)

References 44 publications

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“…The SF values for the three metal ions on SBL at metal ion concentrations of 1 mg/L and 2000 mg/L were studied and are presented in Tables 3; Table 4 for water and soil samples, respectively. The SF values were less than unity for all the metal ions from both samples, demonstrating the favorable potential of the sorbent SBL for the selected metal ions uptake; similar findings were observed in other studies (Sharef and Fakhre, 2022).…”

Section: Adsorption Isotherms Study For Aqueous and Soil Samplessupporting

confidence: 89%

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A cost-effective o-toulidine-based Schiff base as an efficient sorbent for metal ion uptake from aqueous and soil samples: Synthesis, antimicrobial, and acute toxicity analyses

Khan

Jamil

Jabeen

et al. 2023

Front. Environ. Sci.

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Heavy metals create serious health problems, so the practical implementation and development of low-cost sorbent materials to remove heavy metals from the ecosystem is a worldwide issue. The purpose of this study is to find a low-cost ligand that has the potential to adsorb heavy metals from aqueous and soil samples and also has biological potential. For this, a Schiff base, dimeric o-toluidine (SBL), has been synthesized through condensation, characterized by spectroscopic analysis, and had its biological activities measured. We also studied its adsorption efficiency through a batch technique to remove Zn(II), Co(II), and Cu(II) from aqueous and soil samples under different conditions such as metal ion concentration, pH, contact time, and SBL concentration. The adsorption potential of SBL was analyzed by the Langmuir and Freundlich adsorption isotherms. The values of correlation coefficients revealed that the Freundlich isotherm elucidated results that were more appropriable than the Langmuir model. Adsorption equilibrium was established in 90 min for aqueous samples and in 1,440 min for soil samples. For the maximum adsorption of all metals, the optimum pH was 8, and it showed a capacity to remove 77 to 95 percent of metals from the samples. The maximum adsorption capacity (qmax) of SBL were 75.75, 62.50, and 9.17 mg g-1 in the case of Cu(II), Zn(II), and Co(II) ions, respectively, from aqueous samples and 10.95, 64.10, and 88.49 mg g-1 in the case of Zn(II), Cu (II), and Co(II), respectively, from soil samples. The effectiveness of SBL in the sorption of the selected metals was found to be Cu+2 > Zn+2 > Co+2 for aqueous samples and Co+2 > Cu+2 > Zn+2 for soil samples. The antimicrobial activity of SBL was also investigated. The results revealed that SBL showed moderate inhibitory activity against Staphylococcus dysentria, C. albican, and Aspergillus niger, whereas it exhibited weak activity against S. aureus, P. aureginosa, K. pneumoniae, P. vulgaris, and E.coli when compared to Fluconazole and Ciprofloxacin as the standard. Acute toxicity of the synthesized compound was measured through its daily oral administration with various doses ranging from 0.1 to 1,000 mg/kg of the mice’s body weights. Even at the dose of 1,000 mg/kg, the SBL showed no mortality or any type of general behavioral change in the treated mice. Based on preparation cost, metal removal capacity, toxicity, and antimicrobial activities, SBL is an excellent sorbent and should be studied at pilot scale levels.

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Section: Adsorption Isotherms Study For Aqueous and Soil Samplessupporting

confidence: 89%

“…It can also be seen that the increased quantity of SBL from 0.1 g did not significantly influence the sorption percentage. This could be associated with the excess amount of the sorbent preventing the metallic cations from approaching the active sites of the adsorbent (Sharef and Fakhre, 2022).…”

Section: Adsorbent Dosage Effects On Removal Efficiencymentioning

confidence: 99%

A cost-effective o-toulidine-based Schiff base as an efficient sorbent for metal ion uptake from aqueous and soil samples: Synthesis, antimicrobial, and acute toxicity analyses

Khan

Jamil

Jabeen

et al. 2023

Front. Environ. Sci.

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“…The original Fe-BC had more phenolic hydroxyl groups forming an intermolecular hydrogen bond than La-BC, but the crosslinking (relative to amino groups) density was lower. FTIR spectra showed that the modified BC chain was grafted onto the modified BC chain through a Schiff base reaction 42 and the modified BC chain was developed into a three-dimensional network through hydrogen bonding.…”

Section: Discussionmentioning

confidence: 99%

Characterization and Adsorption Capacity of Modified Biochar for Sulfamethylimidine and Methylene Blue in Water

Zheng

Yang

2023

ACS Omega

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In this study, a composite of pond mud and lanthanum-and nanozero valent iron-modified-biochar was investigated for its ability to adsorb methylene blue (MB) and sulfamethazine (SMZ). La-modified attapulgite and nano-zero valent iron (surface area enhanced by 43.7% via Brunauer−Emmett− Teller analysis) were successfully loaded onto the straw-sediment biochar (BC) surface. With the increase in pyrolysis temperature, the biocompatibility yield, the H, O, and N content, and the ratio of carbon elements decreased, while the pH value, surficial micropores, C element, and ash content increased. The biocarbon small molecules were gradually and tightly ordered, and the organic groups such as hydroxyl, carboxyl groups, and carbon oxygen double bonds were gradually lost or disappeared. The original Fe-BC had more phenolic hydroxyl groups forming an intermolecular hydrogen bond than others with a higher adsorption capacity possibly through the Schiff base reaction. The effect of various pH (2−9), temperature (15−35 °C), and initial concentration (1−25 mg L −1 ) on adsorption was investigated. pH and temperature were the main factors governing the adsorption process. The maximum adsorption capacity was observed at pH 4. The adsorption performances for MB followed the order Fe-BC > La-BC > BC, and the maximum removal rate was over 98.45% with pH = 7. The three types of BC dosages between 0.2 (6.67 g L −1 ) and 0.4 g showed a removal rate of 99% for MB. The adsorption capacity of Fe-BC, La-BC, and BC for MB was 2.201, 1.905, and 2.401 mg L −1 with pH = 4, while 4.79, 4.58, and 5.55 mg g −1 were observed with BC dosage at 0.025 g. For SMZ, the higher the temperature, the better the adsorption effect, and it reaches saturation at approximately 25 °C. To further evaluate the nature of adsorption, Langmuir/Freundlich/Temkin models were tested and the adsorption capacities were evaluated on the surface of the BC composite. The three modified materials were physisorbed to SMZ, while MB was chemisorbed. For MB, the adsorption performance of BC is the best < 0.2 g (6.67 g L −1 ) at pH 7.0 at 35 °C. The Elovich model was more suitable for MB, while the Freundlich and Temkin models could better fit the adsorption process of MB. The preparatory secondary dynamics equation and Langmuir equation were more compliant for SMZ, and the saturated adsorption capacities of straw-modified, La-BC, and Fe-BC reached 5.699, 6.088, and 5.678 mg L −1 , respectively.

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“…Also, it showed a signal for the hydroxyl group at 8.01-10.09 ppm, whereas the methylene proton was represented by 4.40 ppm. CHaliphatic protons were referred to as a quintet at 4.71 ppm [24].…”

Section: H-nmr Spectrummentioning

confidence: 99%

Synthesis, Characterization and Biological Activity of New Oleander Complexes against Bacteria Found in Polluted Water

Abdulsada,

Hassan,

Awad

2023

Indones. J. Chem.

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Natural polymers are often non-toxic, biodegradable, biocompatible, and safe. A novel ligand was synthesized as a natural polymer using chitosan and oleander plant extract [(2R,3S,4R,5S)-5-(acetoxyamino)-4-hydroxy-3,6-dimethoxytetrahydro-2H-pyran-2-yl) methyl (16R)-3-(((2S,4S,5R)-4-methoxy-2,5-dimethyltetrahydro-2H-pyran-2-yl)oxy-10,13,16-trimethyl-17-(5-oxo-2,5-dihydrofuran-3-yl) hexadecahydro-14H-cyclopenta [a] phenanthren-14-yl) phthalate] (Chitosan-Ph-Oleander). This ligand and its complexes with several metals (Cr+3, Mn+2, Fe+3, Ni+2, Cu+2, Zn+2) were characterized using FTIR, UV-visible and 1H-NMR spectroscopy, as well as by molar conductivity, magnetic moment, and TGA analysis. The biological activity for the prepared polymer and its complexes was studied to inhibit the effectiveness of some bacteria found in polluted water taken from hospitals wastewater. The effectiveness of inhibition was tested on Fusarium oxysporum fungus, which causes wilting, rotting and seedling death diseases in various types of plants. The elemental and spectral investigation results showed that all prepared compounds had octahedral geometry. Compared to the free ligand, all metal complexes showed discernible antibacterial activity. The zinc(II) complex, in comparison to other metal complexes, showed higher antibacterial activity against Faecal streptococci bacteria (G+) and Pseudomonas aeruginosa bacteria (G−). In addition, the inhibition rate of the effectiveness of the F. oxysporum fungus reached ~50%.

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Rapid adsorption of some heavy metals using extracted chitosan anchored with new aldehyde to form a schiff base

Cited by 6 publications

References 44 publications

A cost-effective o-toulidine-based Schiff base as an efficient sorbent for metal ion uptake from aqueous and soil samples: Synthesis, antimicrobial, and acute toxicity analyses

A cost-effective o-toulidine-based Schiff base as an efficient sorbent for metal ion uptake from aqueous and soil samples: Synthesis, antimicrobial, and acute toxicity analyses

Characterization and Adsorption Capacity of Modified Biochar for Sulfamethylimidine and Methylene Blue in Water

Synthesis, Characterization and Biological Activity of New Oleander Complexes against Bacteria Found in Polluted Water

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