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Preparation and application of magnetic nitrogen-doped rGO for persulfate activation.
Environ Sci Pollut Res Int. 2018 Oct; 25(30):30575-30584.ES

Abstract

A heterogeneous catalyst (M-N-rGO) composed of stability enhanced magnetic iron oxide nanoparticles and nitrogen-doped reduced graphene oxide was synthesized and characterized by SEM, XRD, BET, and XPS. It showed excellent catalytic degradation properties in advanced oxidation technology. In the presence of 200 mg/L catalyst and 135 mg/L persulfate at pH 5, 95% of 10-20 mg/L methylene blue could be degraded in 90 min with the TOC removal efficiency of 50%. The rate constant based on pseudo-first-order kinetics ranged from 0.0227 to 0.0488/min in the temperature range of 15 to 32 °C, and the activation energy was 32.5 kJ/mol. Under the optimal operation conditions, 20 mg/L of 2,4-dichlorophneol (2,4-DCP) could be removed almost completely. EPR analysis showed that sulfate and hydroxyl radicals were responsible for degradation of pollutants, and radical quenching experiments indicated that nonradical pathway also played a role in pollutant removal. And a mechanism for M-N-rGO and persulfate system was elucidated. This catalyst was easy for preparation, low-cost, highly effective, convenient for separation, and could be used effectively for four times through 0.1 mol/L H2SO4 regeneration. It provided a choice for wastewater treatment in practice.

Authors+Show Affiliations

College of Biology and Environmental Engineering, Changsha University, Changsha, 410002, China. Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA.College of Biology and Environmental Engineering, Changsha University, Changsha, 410002, China. luokun@ccsu.edu.cn.College of Environmental Science and Engineering, Hunan university, Changsha, 410082, China. tanglin@hnu.edu.cn.College of Biology and Environmental Engineering, Changsha University, Changsha, 410002, China.College of Biology and Environmental Engineering, Changsha University, Changsha, 410002, China.College of Biology and Environmental Engineering, Changsha University, Changsha, 410002, China.College of Biology and Environmental Engineering, Changsha University, Changsha, 410002, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30173386

Citation

Pang, Ya, et al. "Preparation and Application of Magnetic Nitrogen-doped rGO for Persulfate Activation." Environmental Science and Pollution Research International, vol. 25, no. 30, 2018, pp. 30575-30584.
Pang Y, Luo K, Tang L, et al. Preparation and application of magnetic nitrogen-doped rGO for persulfate activation. Environ Sci Pollut Res Int. 2018;25(30):30575-30584.
Pang, Y., Luo, K., Tang, L., Li, X., Song, Y., Li, C. Y., & Wang, L. P. (2018). Preparation and application of magnetic nitrogen-doped rGO for persulfate activation. Environmental Science and Pollution Research International, 25(30), 30575-30584. https://doi.org/10.1007/s11356-018-2974-2
Pang Y, et al. Preparation and Application of Magnetic Nitrogen-doped rGO for Persulfate Activation. Environ Sci Pollut Res Int. 2018;25(30):30575-30584. PubMed PMID: 30173386.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Preparation and application of magnetic nitrogen-doped rGO for persulfate activation. AU - Pang,Ya, AU - Luo,Kun, AU - Tang,Lin, AU - Li,Xue, AU - Song,Yong, AU - Li,Cheng-Yong, AU - Wang,Li-Ping, Y1 - 2018/09/01/ PY - 2018/05/15/received PY - 2018/08/14/accepted PY - 2018/9/3/pubmed PY - 2019/1/10/medline PY - 2018/9/3/entrez KW - Advanced oxidation technology KW - Magnetic nanoparticles KW - Nitrogen-doped graphene oxide KW - Sulfate radical KW - Wastewater treatment SP - 30575 EP - 30584 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 25 IS - 30 N2 - A heterogeneous catalyst (M-N-rGO) composed of stability enhanced magnetic iron oxide nanoparticles and nitrogen-doped reduced graphene oxide was synthesized and characterized by SEM, XRD, BET, and XPS. It showed excellent catalytic degradation properties in advanced oxidation technology. In the presence of 200 mg/L catalyst and 135 mg/L persulfate at pH 5, 95% of 10-20 mg/L methylene blue could be degraded in 90 min with the TOC removal efficiency of 50%. The rate constant based on pseudo-first-order kinetics ranged from 0.0227 to 0.0488/min in the temperature range of 15 to 32 °C, and the activation energy was 32.5 kJ/mol. Under the optimal operation conditions, 20 mg/L of 2,4-dichlorophneol (2,4-DCP) could be removed almost completely. EPR analysis showed that sulfate and hydroxyl radicals were responsible for degradation of pollutants, and radical quenching experiments indicated that nonradical pathway also played a role in pollutant removal. And a mechanism for M-N-rGO and persulfate system was elucidated. This catalyst was easy for preparation, low-cost, highly effective, convenient for separation, and could be used effectively for four times through 0.1 mol/L H2SO4 regeneration. It provided a choice for wastewater treatment in practice. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/30173386/Preparation_and_application_of_magnetic_nitrogen_doped_rGO_for_persulfate_activation_ L2 - https://dx.doi.org/10.1007/s11356-018-2974-2 DB - PRIME DP - Unbound Medicine ER -