LaFeO(3)和 H(2)O(2)表面络合增强类芬顿体系降解难降解有机污染物
Enhanced Fenton-like degradation of refractory organic compounds by surface complex formation of LaFeO(3) and H(2)O(2).
机构信息
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
出版信息
J Hazard Mater. 2015 Aug 30;294:195-200. doi: 10.1016/j.jhazmat.2015.03.065. Epub 2015 Mar 31.
Nanoscale LaFeO(3) was prepared via sol-gel method and characterized by XRD, FTIR and N2 adsorption/desorption experiment. The results indicated that, LaFeO(3) had a typical perovskite structure with a BET area of 8.5m(2)/g. LaFeO(3) exhibited excellent Fenton activity and stability for the degradation of pharmaceuticals and herbicides in water, as demonstrated with sulfamethoxazole, phenazone, phenytoin, acyclovir and 2,4-dichlorophenoxyacetic acid, 2-chlorophenol. Among them, sulfamethoxazole (SMX) could be completely removed in LaFeO(3)-H(2)O(2) system after reaction for 120 min at neutral pH. Based on the ATR-FTIR analysis, the surface complex of LaFeO(3) and H(2)O(2). was formed, which was important and essential for the enhanced Fenton reaction by accelerating the cycle of Fe(3+)/Fe(2+). Hence, more OH and O(2)(-)/HO(2)(-) were then produced in LaFeO(3)-H(2)O(2) system, resulting in more efficient removal of refractory organic compounds. Based on the surface interaction of LaFeO(3) and H(2)O(2), a heterogeneous Fenton reaction mechanism was proposed.
采用溶胶-凝胶法制备了纳米 LaFeO(3)，并用 XRD、FTIR 和 N2 吸附/脱附实验对其进行了表征。结果表明，LaFeO(3)具有典型的钙钛矿结构，BET 面积为 8.5m(2)/g。LaFeO(3)在水中对药物和除草剂的降解表现出优异的芬顿活性和稳定性，以磺胺甲恶唑、苯唑、苯妥英、阿昔洛韦和 2,4-二氯苯氧乙酸、2-氯苯酚为例。其中，在中性 pH 值下，SMX 在 LaFeO(3)-H(2)O(2)体系中反应 120 分钟后可完全去除。基于 ATR-FTIR 分析，形成了 LaFeO(3)和 H(2)O(2)的表面络合物，这对于通过加速 Fe(3+)/Fe(2+)循环来增强芬顿反应非常重要且必不可少。因此，在 LaFeO(3)-H(2)O(2)体系中产生了更多的 OH 和 O(2)(-)/HO(2)(-)，从而更有效地去除难处理的有机化合物。基于 LaFeO(3)和 H(2)O(2)的表面相互作用，提出了一种非均相芬顿反应机理。
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