生物炭负载 γ-MnO2 纳米复合材料活化过一硫酸盐降解对氯苯酚的性能及机理

作者：Yao Hongjia; Chen Xing; Zhang Yu; Liu Tong; Cui Kangping^*; Chen Changbin; Xu Zhengjiang

来源：Chinese Journal of Environmental Engineering, 2022, 16(6): 1833-1844.

DOI：10.12030/j.cjee.202201078

• biochar
• crystal phase
• degradation of 4-chlorophenol
• MnO2
• peroxymonsulfate

Four kinds of MnO2 with different crystal phase structure and biochar supported γ-MnO2 nanocomposites were synthesized by hydrothermal method, and their performance on activating peroxymonsulfate(PMS) and degrading 4-CP was studied. XRD, SEM, EDS and XRF were used to characterize different nano-composite materials. It was found that only γ-MnO2 was successfully loaded on the surface of biochar to form γ-MnO2@BC. Under the optimum conditions, 10 mg·L?1 4-chlorophenol could be completely degraded by γ-MnO2@BC activated PMS in 20 min. γ-MnO2@BC showed the strong anti-interference against anions except for H2PO4?. Finally, the mechanism of reactive oxygen species (ROS) generated by γ-MnO2@BC activated PMS was studied by means of free radical capture, electron spin resonance spectroscopy (ESR) and X-ray energy spectroscopy (XPS). The results showed that the ROS produced by γ-MnO2@BC activated PMS was singlet oxygen. It is found that the ratio of Mn(III) to Mn(IV) was the main factor affecting the catalytic performance of MnO2 with different crystalline phases. ? 2022 Science Press.

• 单位
  合肥工业大学