Yang Lei, Wang Zhonghua, Hu Zhipei, Wang Xiaochun, Cheng Xiangming, Chen Yongqi, Wang Song, Wang Chenghao, Zhou Wei, Zhao Haiqian
School of Civil and Architectural Engineering, Northeast Petroleum University, Daqing 163318, China.
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Langmuir. 2024 Aug 13;40(32):16981-16993. doi: 10.1021/acs.langmuir.4c01934. Epub 2024 Aug 1.
This study investigates the effect of N-doped coal-based activated carbon cathode on formaldehyde-oxygen coadsorption. Further investigation investigates the effect of formaldehyde-oxygen coadsorption on HO generation and formaldehyde removal in an electro-Fenton system. Nitrogen doping enhances formaldehyde and oxygen coadsorption by modulating competitive adsorption. Density Functional Theory (DFT) calculations confirm pyrrole nitrogen favors formaldehyde, and graphite nitrogen favors oxygen adsorption. N-doped activated carbon adsorbs 0.36 mg of formaldehyde and 0.1 mg of oxygen in 120 min and removes 82.43% of formaldehyde after electro-Fenton treatment. N-doped activated carbon enhances the synergistic adsorption of formaldehyde and oxygen. In the synergistic adsorption process, the amount of formaldehyde adsorbed is greater than the amount of oxygen adsorbed. This improves the removal efficiency of formaldehyde by electro-Fenton technology. It provides a new method for electro-Fenton removal of organic pollutants.
本研究考察了氮掺杂煤基活性炭阴极对甲醛-氧共吸附的影响。进一步研究了甲醛-氧共吸附对电芬顿体系中羟基自由基生成及甲醛去除的影响。氮掺杂通过调节竞争吸附增强了甲醛和氧的共吸附。密度泛函理论（DFT）计算证实吡咯氮有利于甲醛吸附，而石墨氮有利于氧吸附。氮掺杂活性炭在120分钟内吸附0.36毫克甲醛和0.1毫克氧，电芬顿处理后甲醛去除率达82.43%。氮掺杂活性炭增强了甲醛和氧的协同吸附。在协同吸附过程中，吸附的甲醛量大于吸附的氧量。这提高了电芬顿技术对甲醛的去除效率。为电芬顿去除有机污染物提供了一种新方法。
