Status : Verified
| Personal Name | Lasagas, Roselle C. |
|---|---|
| Resource Title | Optimized Reductive Degradation of Carbon Tetrachloride Using Tree Leaf Polyphenol-Iron Complex for Groundwater Remediation |
| Date Issued | July 2024 |
| Abstract | Natural plant polyphenols can inhibit oxidation, donate electrons, and chelate metal ions. In the presence of iron minerals, the catecholate or gallate group of polyphenol binds to ferrous ion, forming coordination complex. This complex can exhibit synergistic potential to degrade contaminants that are susceptible to reductive degradation such as Carbon Tetrachloride which has a high oxidation state. Carbon tetrachloride is a synthetic chlorinated solvent that is toxic and a probable human carcinogen. Its emission in the environment has persisted especially in groundwater where its level can remain elevated for years. This study was conducted to investigate degradation of carbon tetrachloride via reductive process in aqueous solution using tree leaf polyphenol-iron complex. Waste tree leaves of Ficus microcarpa, Terminalia neotaliala, Haematoxylon campechianum, Ficus septica, Mangifera indica, and Ficus religiosa were extracted for polyphenols at 20 °C for 24 hours. Analysis using High-performance liquid chromatography (HPLC) and Fourier Transform Infrared Spectroscopy (FTIR) indicated the presence of polyphenols such as gallic acid, 4-hydrobenzoic acid, tannic acid, vanillic acid, and/or caffeic acid. Terminalia neotaliala extract (TNE) was selected for CT degradation after evaluation of antioxidant activity, reducing power, chelating effect, and total phenolic content. Taguchi method was used in the experimental design employing L9(3^3) orthogonal array to evaluate pH, leaf dose, and iron dose. The CT removal after 24 hours was measured using Gas Chromatography Flame Ionization Detector (GC-FID). The optimal conditions identified were pH 10, leaf dose of 10 g/L, and iron dose of 15 mM. pH was found to be the significant factor in CT degradation based on the results of Analysis of Variance (ANOVA). The removal of CT after 24 hours in deionized water solution using optimal conditions was 95-99% while it was 89% in field groundwater solution d |
| Degree Course | Master of Science in Environmental Engineering |
| Language | English |
| Keyword | Polyphenol-iron Complex, Carbon Tetrachloride, Reductive Degradation, Groundwater Remediation |
| Material Type | Thesis/Dissertation |
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