赤铁矿
光催化
降级(电信)
化学
纳米颗粒
环境化学
面(心理学)
化学工程
催化作用
材料科学
纳米技术
矿物学
有机化学
电信
社会心理学
工程类
五大性格特征
人格
计算机科学
心理学
作者
Xiaopeng Huang,Ying Chen,Éric Walter,Meirong Zong,Yang Wang,Xin Zhang,Odeta Qafoku,Zhe-Ming Wang,Kevin M. Rosso
标识
DOI:10.1021/acs.est.9b02946
摘要
Hematite nanoparticles are abundant in the photic zone of aquatic environments, where they play a prominent role in photocatalytic transformations of bound organics. Here, we examine the photocatalytic degradation of rhodamine B by visible light using two different structurally well-defined hematite nanoparticle morphologies. In addition to detailed solid characterization and aqueous kinetics measurements, we also exploit species-selective scavengers in electron paramagnetic resonance spectroscopy to sequester specific reaction channels and thereby assess their impact. The photodegradation rates for nanoplates dominated by {001} facets and nanocubes dominated by {012} facets were 0.13 and 0.7 h-1, respectively, and the turnover frequencies for the active sites on {001} and {012} were 7.89 × 10-3 and 3.07× 10-3 s-1, yielding apparent activation energies of 17.13 and 24.94 kcal/mol within the energetic span model, respectively. Facet-specific differences appear to be directly not linked with the simple aerial cation site density but instead with their extent of undercoordination. By establishing this linkage, the findings lay a foundation for predicting the photocatalytic degradation efficiency for the myriad of possible hematite nanoparticle morphologies and more broadly help unveil key reactions at the interface that may govern photocatalytic organic transformations in natural and engineered aquatic environments.
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