过硫酸盐
催化作用
傅里叶变换红外光谱
石墨烯
X射线光电子能谱
化学
降级(电信)
氧化物
核化学
化学工程
纳米颗粒
材料科学
纳米技术
有机化学
电信
工程类
计算机科学
作者
Chuanqi Zhao,Yajuan Li,Xixiang Liu,Qin Shi,Zefeng Song
摘要
Abstract BACKGROUND Organophosphorus herbicides in water are an increasingly critical environmental problem. Given this challenge, a free‐standing 3D reduced graphene oxide (GO) foam supporting Fe 3 O 4 nanoparticles (3D‐rGO‐Fe 3 O 4 ) was synthesized using GO as a precursor and applied as an efficient persulfate activator for glyphosate (GLY) degradation. RESULTS The effects of Fe 3 O 4 mass, pH, oxidant dosage, temperature and common ions on GLY degradation were investigated in detail. Analytical techniques using scanning electron microscopy (SEM), Fourier transform infrared analysis (FTIR) and X‐ray photoelectron spectroscopy (XPS) indicated that the 3D foam prevented aggregation of the Fe 3 O 4 nanoparticles by in situ uniform formation on GO nanosheets. The addition of Fe was vitally important for activation of the oxidation system. The results of batch‐scale experiments illustrated that the GLY degradation efficiency reached 96.8% with initial GLY concentration 30 mg L −1 , graphene:Fe 3 O 4 mass ratio 1:7, solution pH 4 and persulfate mass 48 mg. High temperatures could significantly facilitate GLY degradation. Additionally, the 3D‐rGO‐Fe 3 O 4 material proved highly stable according to the replicated test results. Furthermore, EPR test results revealed that Na 2 S 2 O 8 catalytic activation by 3D‐rGO‐Fe 3 O 4 mainly produced ·OH and SO 4 − ·, and the predominant free radical was SO 4 − · in the current experiment. CONCLUSION The results indicate that 3D‐rGO‐Fe 3 O 4 has good catalytic activity and stability, and, accordingly, has high application prospects for the remediation of organophosphorus herbicide‐contaminated water. © 2023 Society of Chemical Industry (SCI).
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