Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 28, Issue 19, Pages 23707-23719Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-11043-0
Keywords
Nanostructured materials; Rice husk silica; MCM-41; Water pollution; EDCs
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Funding
- Universidad Tecnologica Nacional [IPUTNCO0005188, MSUTNCO0005243]
- Consejo Nacional de Investigaciones Cientificas (CONICET)
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A study successfully synthesized nanostructured mesoporous materials using silica from rice husk, modified with iron loading, to create Fe/MCM-RHA composites with excellent photocatalytic performance for degrading endocrine-disrupting chemicals. The presence of finely dispersed iron species on the silica structure, specifically the Fe(3+) ions, played a key role in the high catalytic efficiency observed during the photo-Fenton degradation process.
Nanostructured mesoporous materials of MCM-41 type were synthesized using a natural, non-toxic, and cheap source of silica from rice husk. Then, this pure silica was modified with several Fe loadings by a wet impregnation method. The chemical and physic properties of MCM-41 solids obtained were similar to those of MCM-41 synthesized from commercial silica by conventional method. Thus, all catalysts exhibited good structural regularity preserving the mesoporosity after the metal incorporation. The performance of the Fe/MCM-RHA composites as photo-Fenton heterogeneous catalysts was evaluated for photocatalytic degradation of different endocrine-disrupting chemicals (EDCs), such as herbicides (atrazine), and compounds derived from the plastic industry (bisphenol A) and the pharmaceutical industry (acetaminophen). The major photo-catalytic efficiency obtained (Fe/MCM-RHA(2.5)) is consistent with the highest presence of iron species, which are finely dispersed and stabilized on the silica structure, the isolated Fe(3+)ions being the accessible and active sites for the reaction. Finally, a cheaper solid arising from the valorization of residual biomass and with excellent photocatalytic performance for the degradation of EDCs (above 99%, 75%, and 60% for BPA, ATZ, and ACE respectively, in a reaction time of 240 min) was obtained.
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