3 years ago

FeII/FeIII Doped Bi/BiOBr Hierarchical Microspheres as a Highly Efficient Catalyst for Degradation of Organic Contaminants at Neutral pH: The Role of Visible Light and H2O2

FeII/FeIII Doped Bi/BiOBr Hierarchical Microspheres as a Highly Efficient Catalyst for Degradation of Organic Contaminants at Neutral pH: The Role of Visible Light and H2O2
Dongsheng Wang, Wentao Li, Guangyu An, Feng Xiao, Xin Geng
A novel FeII/FeIII doped Bi/BiOBr (FBB) visible-light, Fenton-like catalyst was successfully synthesized by using the solvothermal method. The morphological and structural features of FBB were analyzed by XRD, field emission (FE)-SEM, TEM, Brunauer–Emmett–Teller (BET), and X-ray photoelectron spectroscopy (XPS) techniques. The results revealed that the presence of Fe could promote the growth of Bi metal nanoparticles, and increase the specific surface areas of FBB. Rhodamine B (RhB) photodegradation experiments indicated that FBB with the Fe/Bi molar ratio (0.2–0.3) exhibited higher photocatalytic activities. In the photo-Fenton-like reaction, the degradation efficiency of bisphenol A (BPA) over FBB-25 was increased to 100 % within 30 min whereas it was 3 % and 12 % in the Fenton-like and photocatalytic reactions. Moreover, 2-chlorophenol (2-CP), 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) were completely degraded within 30 min over FBB-25. The presence of visible light can promote the rapid reaction rate between FeII and FeIII over FBB with H2O2, producing more hydroxyl radicals (.OH) and more holes. The radical scavenger experiments demonstrated that holes and hydroxyl radicals (.OH) were the main active species. FBB-25 is still stable after five cycles. Therefore, FBB-25 has great potential in wastewater treatment. Highly active catalyst: FeII/FeIII doped Bi/BiOBr (FBB) is an excellent visible-light, Fenton-like catalyst for the degradation of organic contaminants in wastewater. Visible light can increase the multiple transformation rate of ≡FeIII to ≡FeII over FBB in the presence of H2O2, producing more holes and hydroxyl radicals to degrade organic molecules.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cctc.201700549

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