球磨机
吸附
纳米复合材料
生物炭
X射线光电子能谱
催化作用
化学工程
解吸
化学
氧气
电子顺磁共振
核化学
材料科学
冶金
纳米技术
有机化学
热解
工程类
物理
核磁共振
作者
Xiaoxue Yang,Kun Luo,Zhoujie Pi,Peng Shen,Puyu Zhou,Liping He,Xiaoming Li,Qi Yang
标识
DOI:10.1016/j.seppur.2022.122703
摘要
A novel nanocomposite CeO2/Fe3O4/biochar (BC) was prepared using a straightforward, solvent-free mechanical ball milling method. Comparatively to the material prepared by chemical co-precipitation (77.14 %) and raw BC (33.64 %), CeO2/Fe3O4/BC prepared by ball milling achieved better tetracycline (TC) removal (94.35 %) under the optimal condition (TC concentration 10 mg·L-1, catalyst dose 0.5 g·L-1 and pH 9.01). Ball milling not only reduced the particle size, but also increased the surface area of composite, which was favorable to the adsorption of TC on CeO2/Fe3O4/BC. Meanwhile, the number of oxygen-containing functional groups in as-prepared nanocomposite increased after ball milling, which could serve as the bridge of electron transfer to enhance TC degradation. Dissolved oxygen (DO) was activated by CeO2/Fe3O4/BC to produce reactive oxygen species (ROS) for the TC degradation. X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) characterization indicated that the enhanced oxygen activation should be attributed to the presence of Ce4+/Ce3+ and Fe3+/Fe2+ redox pairs and persistent free radicals (PFRs) in CeO2/Fe3O4/BC. Desorption experiments suggested that the adsorption and degradation induced by ball-milled CeO2/Fe3O4/BC were accounted for about 79.8 % and 20.2 % of total TC removal, respectively. This study revealed that the organic pollutants removal by BC-based nanocomposite is not alone contribution of the adsorption and the degradation behavior during this process should be concerned.
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