A Stable Fe2O3/Expanded Perlite Composite Catalyst for Degradation of Rhodamine B in Heterogeneous Photo-Fenton System
A Stable Fe2O3/Expanded Perlite Composite Catalyst for Degradation of Rhodamine B in Heterogeneous Photo-Fenton System
复制标题
多相光芬顿体系中稳定的 Fe2O3/膨胀珍珠岩复合催化剂降解罗丹明 B
DOI：
10.1007/s11270-017-3646-4
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发表时间：
2017-12-01
影响因子：
2.9
通讯作者：
Zhang, Gaoke
中科院分区：
文献类型：
--
作者：
Jiang, Lisha;Wang, Junting;Zhang, Gaoke
采用简单水热法合成了一种稳定高效的Fe2O3/膨胀perite （Fe2O3- ep）复合催化剂，用于降解非均相光- fenton体系中的难降解污染物。x射线衍射和红外光谱分析证实了合成催化剂中fe2o3的存在。在可见光照射下，通过对罗丹明B （RhB, 5 mg/L）和甲硝唑（MET, 5 mg/L）的降解，考察了Fe2O3-Ep催化剂的催化活性。Fe2O3-Ep催化剂在2 ~ 10的较宽pH范围内对RhB具有较高的降解效率，对MET的分解也表现出优异的催化性能。在最佳实验条件（Fe2O3-Ep催化剂用量为0.5 g/L， H2O2用量为2 mL/L）下，90 min内RhB的降解率达到99%，COD去除率为62%。此外，Fe2O3-Ep催化剂在催化降解过程中的铁浸出可以忽略不计，在5个循环后仍具有较高的催化活性和稳定性。这些结果表明，该催化剂可作为一种高效的非均相光- fenton催化剂用于降解水中不可生物降解的难降解污染物。
A stable and efficient Fe2O3/expanded perlite (Fe2O3-Ep) composite catalyst was synthesized by a simple hydrothermal method for degradation of refractory contaminants in heterogeneous photo-Fenton system. X-ray diffraction and FT-IR analyses confirmed the presence of the Fe2O3in the synthesized catalyst. The catalytic activity of the Fe2O3-Ep catalyst was evaluated by the degradation of rhodamine B (RhB, 5 mg/L) and metronidazole (MET, 5 mg/L) in the presence of H2O2under visible light irradiation. The Fe2O3-Ep catalyst exhibited high efficiency for degradation of RhB at a wide pH range from 2 to 10 and showed excellent catalytic property for decomposition of MET as well. The degradation ratio of RhB was achieved 99%, and the removal ratio of COD was 62% within 90 min at the best experimental conditions (0.5 g/L of Fe2O3-Ep catalyst, 2 mL/L of H2O2). Furthermore, iron leaching of the Fe2O3-Ep catalyst during the catalytic degradation reaction was negligible and the catalyst still exhibited high catalytic activity and stability after five cycles. These results show that the catalyst can be used as a highly efficient heterogeneous photo-Fenton catalyst for the degradation of non-biodegradable refractory pollutants in water.