期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 428, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.128254
关键词
NZVI; Reduced graphene oxide aerogel; Persulfate; Advanced oxidation process; Organophosphorus pesticides
资金
- National Key R&D Program of China [2018YFC1802001]
- Science and Technology Major Project of Tianjin [18ZXSZSF00110]
- special fund for Technology Innovation Guid-ance of Tianjin [21YDTPJC00270]
- Key R&D Program from Science and Technology Department of Ningxia [2019BFG02020]
- Major Scientific and Technological Innovation Project of Shandong Province [2021CXGC011206]
- Ministry of Education of China [T2017002]
In this study, a three-dimensional reduced graphene oxide aerogel-supported nanozero-valent iron was synthesized and used to degrade organophosphorus pesticides in water and contaminated soil. The results showed that the material had excellent catalytic performance and could efficiently degrade the pesticides.
In this study, three-dimensional reduced graphene oxide aerogel (rGOA)-supported nanozero-valent iron (rGOA-nZVI) was successfully synthesized via tailored design and applied to activate persulfate (PS) to degrade three organophosphorus pesticides (OPPs; phorate, terbufos and parathion) in water and a historically contaminated soil. The results showed that loading nZVI nanoparticles on rGOA could prevent the aggregation of nZVI. rGOA-nZVI presented a better catalytic performance for PS activation to degrade the three OPPs than bare nZVI and rGOA, with degradation efficiencies of greater than 99.5% within 5 min. pH had negligible effects on the PS activated by rGOA-nZVI (rGOA-nZVI/PS). EPR measurements and radical quenching experiments showed that center dot SO4- and center dot OH were the main radicals responsible for OPP removal in the rGOA-nZVI/PS system. Furthermore, nine intermediates were identified, and the oxidation and scission of C-S-C, P-S/O and P=S were the dominant degradation pathways of the three OPPs in aqueous solutions treated with rGOA-nZVI/PS. Additionally, rGOA-nZVI/PS achieved degradation efficiencies of 95.1% for phorate, 79.9% for terbufos and 89.1% for parathion in the contaminated soil, and the detected intermediates could be further degraded except triethylphosphate. Overall, this study provides practical knowledge for OPP removal by rGOA-nZVI/PS in wastewater and actual contaminated soil.
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