Journal
MOLECULES
Volume 27, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/molecules27165087
Keywords
schiff base; adsorption; triazole derivatives; chromium; tannery waste water
Funding
- Dunarea de Jos University of Galati, Romania
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A new triazole Schiff base derivative was synthesized and used to remove chromium ions in water. The structure of the newly synthesized adsorbent was confirmed by various tools, and its effectiveness in removing chromium ions was studied. The study showed that the new adsorbent had a good adsorption capacity for Cr(VI).
Tannery industries are one of the extensive industrial activities which are the major source of chromium contamination in the environment. Chromium contamination has been an increasing threat to the environment and human health. Therefore, the removal of chromium ions is necessary to save human society. This study is oriented toward the preparation of a new triazole Schiff base derivatives for the remediation of chromium ions. 4,4 '-((1E)-1,2-bis ((1H-1,2,4-triazol-3-yl) imino)ethane-1,2-diyl) diphenol was prepared by the interaction between 3-Amino-1H-1,2,4-triazole and 4,4 '-Dihydroxybenzil. Then, the produced Schiff base underwent a phosphorylation reaction to produce the adsorbent (TIHP), which confirmed its structure via the different tools FTIR, TGA, (HNMR)-H-1, (CNMR)-C-13, GC-MS, and Phosphorus-31 nuclear magnetic resonance (P-31-NMR). The newly synthesized adsorbent (TIHP) was used to remove chromium oxyanions (Cr(VI)) from an aqueous solution. The batch technique was used to test many controlling factors, including the pH of the working aqueous solution, the amount of adsorbent dose, the initial concentration of Cr(VI), the interaction time, and the temperature. The desorption behaviour of Cr(VI) changes when it is exposed to the suggested foreign ions. The maximum adsorption capacity for Cr(VI) adsorption on the new adsorbent was 307.07 mg/g at room temperature. Freundlich's isotherm model fits the adsorption isotherms perfectly. The kinetic results were well-constrained by the pseudo-second-order equation. The thermodynamic studies establish that the adsorption type was exothermic and naturally spontaneous.
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