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Synthesis of Superparamagnetic Core-Shell Structure Supported Pd Nanocatalysts for Catalytic Nitrite Reduction with Enhanced Activity, No Detection of Undesirable Product of Ammonium, and Easy Magnetic Separation Capability
Sun, Wuzhu; Yang, Weiyi; Xu, Zhengchao; Li, Qi; Shang, Jian Ku; qili@imr.ac.cn
2016
Source PublicationACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
Volume8Issue:3Pages:2035-2047
AbstractSuperparamagnetic nanocatalysts could minimize both the external and internal mass transport limitations and neutralize OH produced in the reaction more effectively to enhance the catalytic nitrite reduction efficiency with the depressed product selectivity to undesirable ammonium, while possess an easy magnetic separation capability. However, commonly used qusi-monodispersed superparamagnetic Fe3O4 nanosphere is not suitable as catalyst support for nitrite reduction because it could reduce the catalytic reaction efficiency and the product selectivity to N2, and the iron leakage could bring secondary contamination to the treated water. In this study, protective shells of SiO2, polymethylacrylic acid, and carbon were introduced to synthesize Fe3O4@SiO2/Pd, Fe3O4@PMAA/Pd, and Fe3O4@C/Pd catalysts for catalytic nitrite reduction. It was found that SiO2 shell could provide the complete protection to Fe3O4 nanosphere core among these shells. Because of its good dispersion, dense structure, and complete protection to Fe3O4, the Fe3O4@SiO2/Pd catalyst demonstrated the highest catalytic nitrite reduction activity without the detection of NH4 produced. Due to this unique structure, the activity of Fe3O4@SiO2/Pd catalysts for nitrite reduction was found to be independent of the Pd nanoparticle size or shape, and their product selectivity was independent of the Pd nanopartide size, shape, and content. Furthermore, their superparamagnetic nature and high saturation magnetization allowed their easy magnetic separation from treated water, and they also demonstrated a good stability during the subsequent recycling experiment.
description.department[sun, wuzhu ; yang, weiyi ; li, qi] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [xu, zhengchao] zhangjiagang green tech environm protect equipmen, zhangjiagang 215625, jiangsu, peoples r china ; [shang, jian ku] univ illinois, dept mat sci & engn, urbana, il 61801 usa
KeywordCatalytic Nitrite Reduction Superparamagnetic Core Protective Layer Product Selectivity Fe3o4@sio2/pd
Funding OrganizationYouth Innovation Promotion Association, Chinese Academy of Sciences [Y2N5711171]; Basic Science Innovation Program of Shenyang National Laboratory for Materials Science [Y4N56R1161, Y4N56F2161]
Indexed Bysci
Language英语
WOS IDWOS:000369044100059
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/75166
Collection中国科学院金属研究所
Corresponding Authorqili@imr.ac.cn
Recommended Citation
GB/T 7714
Sun, Wuzhu,Yang, Weiyi,Xu, Zhengchao,et al. Synthesis of Superparamagnetic Core-Shell Structure Supported Pd Nanocatalysts for Catalytic Nitrite Reduction with Enhanced Activity, No Detection of Undesirable Product of Ammonium, and Easy Magnetic Separation Capability[J]. ACS APPLIED MATERIALS & INTERFACES,2016,8(3):2035-2047.
APA Sun, Wuzhu,Yang, Weiyi,Xu, Zhengchao,Li, Qi,Shang, Jian Ku,&qili@imr.ac.cn.(2016).Synthesis of Superparamagnetic Core-Shell Structure Supported Pd Nanocatalysts for Catalytic Nitrite Reduction with Enhanced Activity, No Detection of Undesirable Product of Ammonium, and Easy Magnetic Separation Capability.ACS APPLIED MATERIALS & INTERFACES,8(3),2035-2047.
MLA Sun, Wuzhu,et al."Synthesis of Superparamagnetic Core-Shell Structure Supported Pd Nanocatalysts for Catalytic Nitrite Reduction with Enhanced Activity, No Detection of Undesirable Product of Ammonium, and Easy Magnetic Separation Capability".ACS APPLIED MATERIALS & INTERFACES 8.3(2016):2035-2047.
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