Li Qiming, Liu Meili, Qiu Xuchun, Liu Xiang, Dapaah Malcom Frimpong, Niu Qijian, Cheng Liang
School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
Institute of Medicine & Chemical Engineering, Zhenjiang College, Zhenjiang 212000, China.
Nanomaterials (Basel). 2022 May 30;12(11):1866. doi: 10.3390/nano12111866.
The overuse of chromium (Cr) has significantly negatively impacted human life and environmental sustainability. Recently, the employment of nano zero-valent iron (nZVI) for Cr(VI) removal is becoming an emerging approach. In this study, carbonized melamine foam-supported nZVI composites, prepared by a simple impregnation-carbonization-reduction method, were assessed for efficient Cr(VI) removal. The prepared composites were characterized by XPS, SEM, TEM, BET and XRD. Batch experiments at different conditions revealed that the amount of iron added, the temperature of carbonization and the initial Cr(VI) concentration were critical factors. Fe@MF-12.5-800 exhibited the highest removal efficiency of 99% Cr(VI) (10 mg/L) at neutral pH among the carbonized melamine foam-supported nZVI composites. Its iron particles were effectively soldered onto the carbonaceous surfaces within the pore networks. Moreover, Fe@MF-12.5-800 demonstrated remarkable stability (60%, 7 days) in an open environment compared with nZVI particles.
铬（Cr）的过度使用已对人类生活和环境可持续性产生了重大负面影响。最近，使用纳米零价铁（nZVI）去除Cr（VI）正成为一种新兴方法。在本研究中，通过简单的浸渍-碳化-还原法制备的碳化三聚氰胺泡沫负载nZVI复合材料被评估用于高效去除Cr（VI）。所制备的复合材料通过XPS、SEM、TEM、BET和XRD进行表征。不同条件下的批量实验表明，铁添加量、碳化温度和初始Cr（VI）浓度是关键因素。在碳化三聚氰胺泡沫负载nZVI复合材料中，Fe@MF-12.5-800在中性pH下对10 mg/L的Cr（VI）表现出最高99%的去除效率。其铁颗粒有效地焊接在孔网络内的碳质表面上。此外，与nZVI颗粒相比，Fe@MF-12.5-800在开放环境中表现出显著的稳定性（7天内为60%）。
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