In situ synthesis of cobalt ferrites-embedded hollow N-doped carbon as an outstanding catalyst for elimination of organic pollutants
In situ synthesis of cobalt ferrites-embedded hollow N-doped carbon as an outstanding catalyst for elimination of organic pollutants
复制标题
原位合成钴铁氧体嵌入空心氮掺杂碳作为消除有机污染物的杰出催化剂
DOI：
10.1016/j.scitotenv.2017.03.180
复制
发表时间：
2017
影响因子：
9.8
通讯作者：
Song Shuang
中科院分区：
文献类型：
--
作者：
Zeng Tao;Yu Mingdong;Zhang Haiyan;He Zhigiao;Zhang Xiaole;Chen Jianmeng;Song Shuang
以聚多巴胺-金属离子络合物为前驱体，制备了中空介孔氮掺杂碳微球包裹尖晶石型铁氧体纳米晶（HM-NC/CoFe 2 O 4），旨在构建一种新型的硫酸根氧化有机污染物的多相催化剂。考察了HM-NC/CoFe 2 O 4催化剂的表面形貌、结构和组成。催化剂的适用性进行了系统的评估，通过大量的控制试验，几个操作参数，以及不同的模型污染物通过过一硫酸盐（PMS）活化。由于HM-NC/CoFe 2 O 4的独特结构和组成，实现了出色的效率和优异的可重复使用性。HM-NC支架具有高的孔隙率和表面积，不仅稳定了CoFe 2 O 4纳米颗粒，而且大大促进了底物对活性位点的可及性和吸附。此外，材料表面的HM-NC和CoFe_2 O_4都可以作为活性中心。硫酸根自由基和羟基自由基被确定为主要活性物种，并提出了一种可能的催化性能增强机制。由于合成方法简单、前驱体价格低廉、结构独特、催化活性和稳定性优异，该复合材料有望成为水污染治理的新型战略材料。
Using polydopamine-metal ions complex as precursor, hollow mesoporous N-doped carbon microspheres encapsulating spinel ferrites nanocrystals (HM-NC/CoFe2O4) were facilely prepared with the aim of creating a novel heterogeneous catalyst for sulfate radical-based oxidation of organic contaminants. The surface morphology, structure and composition of HM-NC/CoFe2O4catalyst were thoroughly investigated. The applicability of the catalyst was systematically assessed through numerous controlled trials, several operating parameters, as well as different model pollutants by means of peroxymonosulfate (PMS) activation. Outstanding efficiency and excellent reusability were achieved due to the unique structure and composition of HM-NC/CoFe2O4. The HM-NC scaffold with high porosity and surface area not only stabilizes the CoFe2O4nanoparticles but also greatly facilitates the accessibility and adsorption of substrates to the active sites. In addition, both HM-NC and CoFe2O4on the material surface can act as active sites. Sulfate radicals and hydroxyl radicals are identified as main active species and a possible enhancement mechanism of catalytic performance is also proposed. Due to the simple synthesis method, low-cost precursors, unique structure and excellent catalytic activity and stability, this novel composite have great potential as new strategic materials for remediation of water pollution.