Hongyang Ren , Daihuimei Xue , Dan Zhao , Wenhui Jin , Xingming Gong , Baoliang Peng , Bing Wang
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Characterization results show that nZVI and Co particles were successfully loaded on GO nanosheets increasing the dispersibility of particles. Under the optimal reaction conditions(the mass ratio of GO: nZVI = 1:2 and Co doping is less than 1/5), the RhB degradation rate was as high as 98.28 %. The degradation pathways of GO/nZVI-Co-HP system could better explained by the secondary kinetic model and GC–MS spectru. The main effect of cobalt doping in the GO/nZVI-Co-HP system is to increase the adsorption properties of the material on H<sub>2</sub>O<sub>2</sub>, and this facilitates the contact reaction of nZVI with H<sub>2</sub>O<sub>2</sub>. 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引用次数: 0
摘要
氧化石墨烯负载的nZVI材料由于其较高的电子传递速率已被应用于处理难以降解的有机物。然而,GO/nZVI复合材料的钴掺杂以及掺杂材料对难降解有机物的影响尚不清楚。本文采用液相还原-悬浮自组装法制备了掺杂钴的石墨烯负载纳米级零价铁(GO/nZVI-Co),其理论质量比为GO:nZVI:Co = 1:2:0.08。以GO/nZVI-Co为多相催化剂,通过H2O2降解罗丹明B (Rhodamine B, RhB)。表征结果表明,在氧化石墨烯纳米片上成功负载了nZVI和Co颗粒,提高了颗粒的分散性。在最佳反应条件下(GO: nZVI质量比为1:2,Co掺杂量小于1/5),RhB的降解率高达98.28%。二级动力学模型和GC-MS谱能较好地解释GO/nZVI-Co-HP体系的降解途径。在GO/nZVI- co - hp体系中掺杂钴的主要作用是提高了材料对H2O2的吸附性能,促进了nZVI与H2O2的接触反应。本研究制备了一种提高电子传递效率的GO/nZVI-Co材料,并阐明了其对污染物的去除机理,为难降解废水的处理提供相关理论支持。
Cobalt-doped Graphene-supported Nanoscale Zero-valent Iron: Removal of Rhodamine B solution and mechanistic study
nZVI materials loaded on GO have been applied to the treatment of difficult-to-degrade organics due to their higher electron transfer rate. However, cobalt doping of GO/nZVI composites and the effect of the doped materials on difficult-to-degrade organics are not known. In this work, Cobalt-doped Graphene-supported nanoscale Zero-valent Iron (GO/nZVI-Co) was successfully synthesized via the liquid-phase reduction-suspension self-assembly method, which was composited with theoretical mass ratio of GO:nZVI:Co = 1:2:0.08. And GO/nZVI-Co was used as efficient heterogeneous catalyst for degradation of Rhodamine B (RhB) via H2O2. Characterization results show that nZVI and Co particles were successfully loaded on GO nanosheets increasing the dispersibility of particles. Under the optimal reaction conditions(the mass ratio of GO: nZVI = 1:2 and Co doping is less than 1/5), the RhB degradation rate was as high as 98.28 %. The degradation pathways of GO/nZVI-Co-HP system could better explained by the secondary kinetic model and GC–MS spectru. The main effect of cobalt doping in the GO/nZVI-Co-HP system is to increase the adsorption properties of the material on H2O2, and this facilitates the contact reaction of nZVI with H2O2. In this study, a GO/nZVI-Co material with improved electron transfer efficiency was prepared and its removal mechanism of pollutants was elucidated to provide relevant theoretical support for the treatment of difficult-to-degrade wastewater.
期刊介绍:
FlatChem - Chemistry of Flat Materials, a new voice in the community, publishes original and significant, cutting-edge research related to the chemistry of graphene and related 2D & layered materials. The overall aim of the journal is to combine the chemistry and applications of these materials, where the submission of communications, full papers, and concepts should contain chemistry in a materials context, which can be both experimental and/or theoretical. In addition to original research articles, FlatChem also offers reviews, minireviews, highlights and perspectives on the future of this research area with the scientific leaders in fields related to Flat Materials. Topics of interest include, but are not limited to, the following: -Design, synthesis, applications and investigation of graphene, graphene related materials and other 2D & layered materials (for example Silicene, Germanene, Phosphorene, MXenes, Boron nitride, Transition metal dichalcogenides) -Characterization of these materials using all forms of spectroscopy and microscopy techniques -Chemical modification or functionalization and dispersion of these materials, as well as interactions with other materials -Exploring the surface chemistry of these materials for applications in: Sensors or detectors in electrochemical/Lab on a Chip devices, Composite materials, Membranes, Environment technology, Catalysis for energy storage and conversion (for example fuel cells, supercapacitors, batteries, hydrogen storage), Biomedical technology (drug delivery, biosensing, bioimaging)