Status : Verified
| Personal Name | Barroga, Sharona Q. |
|---|---|
| Resource Title | Optimized synthesis of polypyrrole-coated molybdenum-based magnetic nanorods for visible light photocatalytic degradation of methylene blue and tetracycline |
| Date Issued | 28 September 2022 |
| Abstract | Contamination of water sources due to the presence of emerging contaminants has been a major environmental concern because it contains organic compounds that bioaccumulate and persist in the water environment. In this study, a semiconducting photocatalyst (polypyrrole-coated magnetic MoO3) with low solubility was synthesized and its effectiveness in the degradation of organic contaminants was evaluated. Polypyrrole (PPy) provided a protective coating, significantly reducing MoO3 dissolution across a wide pH range, while the Fe3O4 core facilitated photocatalyst recovery from treated water. Furthermore, polymerization kinetics of materials was conducted, and was found that the final polymer radius of gyration (Rg) and rate of Rg growth in the polymerization process are influenced by the surface chemistry of the base material. The performance of the PPy@MoO3@Fe3O4 (PMF) on the visible light assisted methylene blue (MB) dye and tetracycline (TC) antibiotic degradation was found to be affected by varying the PMF dosage, contaminant concentration, and solution pH. The results demonstrated that the catalyst dosage is directly proportional to the photocatalytic performance until it reaches its saturation stage while the performance is declined with the increase in initial dye concentration. In addition, with the negatively charged PMF and positively charged MB dye, the photocatalytic performance is more efficient at higher pH. On the other hand, the performance of PMF on antibiotic degradation is highest at neutral pH because of the zwitterionic form of tetracycline present to interact with PMF. Kinetic studies showed that the degradation of MB and TC on PMF followed a pseudo first-order reaction. Furthermore, the degradative properties of PMF towards MB were facilitated by reactive species produced from water oxidation by photogenerated holes (h+), 1O2, H2O2, and •O2¯ radicals while TC is facilitated by the reduction of O2 by photogenerated electrons (e-), H2O2, |
| Degree Course | PhD Chemical Engineering |
| Language | English |
| Keyword | photocatalytic degradation; polymer-coated magnetic photocatalyst; pyrrole; magnetite; molybdenum trioxide; methylene blue; tetracycline |
| Material Type | Thesis/Dissertation |
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Category : I - Has patentable or registrable invention of creation.
Access Permission : Limited Access