A novel α-Fe2O3@g-C3N4 catalyst: Synthesis derived from Fe-based MOF and its superior photo-Fenton performance
A novel α-Fe2O3@g-C3N4 catalyst: Synthesis derived from Fe-based MOF and its superior photo-Fenton performance
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一种新型α-Fe2O3@g-C3N4催化剂：铁基MOF的合成及其优越的光芬顿性能
DOI：
10.1016/j.apsusc.2018.10.183
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发表时间：
2019-03-01
影响因子：
6.7
通讯作者：
Wu, Xiaoyong
中科院分区：
文献类型：
--
作者：
Guo, Ting;Wang, Kai;Wu, Xiaoyong
制备异质结催化剂是提高非均相光Fenton反应（PFR）性能的一种有效途径。本文以三聚氰胺和铁基MOF为原料，通过共煅烧制备了Z型α-Fe 2 O3 @ g-C3 N4催化剂。表征结果表明，α-Fe 2 O3纳米颗粒成功锚定在g-C3 N4表面。采用可见光/H2 O2体系降解四环素（TC），考察了催化剂的光Fenton活性。最佳复合材料FOCN-0.45在60 min内对TC的降解率可达92%;降解率FOCN-0.45的TC（0.042 min（-1））分别是MIL-53（Fe）的6、7和14倍（0.007 min（-1））、α-Fe_2O_3（0.006 min（-1））和g-C_3N_4（0.003 min（-1））。所制备的FOCN-0.45复合材料在较宽的pH值范围内表现出优异的性能和较高的稳定性。α-Fe_2 O_3 @ g-C_3 N_4的Z型异质结增强了光生载流子的分离能力，增加了参与Fe ~（2+）/Fe ~（3+）循环的电子，从而提高了光Fenton催化效率。促进型（OH）-O-中心点自由基是降解有机污染物的主要活性自由基。本工作为设计和合成多相光Fenton催化剂去除有机污染物提供了一条可行的途径。
Fabricating heterojunction catalysts is a promising strategy for improving the performance in heterogeneous photo-Fenton reaction (PFR). Herein, a Z-scheme heterostructured alpha-Fe2O3@g-C3N4 catalyst was successfully synthesized through the co-calcination of melamine and Fe-based MOF. The characterization results demonstrated that alpha-Fe2O3 nanoparticles anchored on the surface of g-C3N4 successfully. The degradation of tetracycline (TC) in visible-light/H2O2 system was adopted to evaluate the photo-Fenton activity of the catalysts. About 92% of TC was degraded by the optimum composite FOCN-0.45 in 60 min; the degradation rate (0.042 min(-1)) of TC by the FOCN-0.45 is 6, 7 and 14 times higher than that by pristine MIL-53 (Fe) (0.007 min(-1)), alpha-Fe2O3 (0.006 min(-1)) and g-C3N4 (0.003 min(-1)), respectively. The prepared FOCN-0.45 composite exhibited excellent performance and high stability in a wide range of pH value. The promoted photo-Fenton catalytic efficiency benefited from the Z-scheme heterojunctions of alpha-Fe2O3@g-C3N4, which enhanced the separation ability of photo-generated charge carriers and increased the electrons that participated in Fe2+/Fe3+ cycle. The boosting (OH)-O-center dot radicals degraded organic pollutants as main reactive radicals. This work presents a feasible path to design and synthesize heterogeneous photo-Fenton catalysts for the removal of organic pollutants.