Remediation of heavy metals polluted environment using Fe-based nanoparticles: Mechanisms, influencing factors, and environmental implications

Constructing Carbon-Coated Fe3O4 Hierarchical Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal Properties

“…Therefore, it is necessary to investigate the effect of the PH value of the solution to the adsorption performance. To get a full understanding about the effect of PH value on the adsorption property of materials, we performed a number of experiments with various PH values (1,2,3,4,7,12,13) are shown in Fig. 8.…”

“…Due to the toxicity of heavy metals and their non-degradability in the human body, water polluted with heavy metals has been a serious global environmental problem [1][2][3][4] . For example, Cr(VI) is a toxic heavy metal ion that can be easily absorbed by the human body and can enter the body through digestion, inhalation, skin and mucous membranes [5][6][7][8] .…”

Zero-Valent Iron Nanoparticles for Soil and Groundwater Remediation

“…Until now, it could be considered that there is an important lack of information on the long-term effect on the environment of nanoparticulate systems, in general, and concretely in NZVI. Some studies reported a concern on its toxicity for many living organism [141][142][143]; however, there are also many studies that reported no significant influence on microbial community [129,144,145]. In addition, Saccà et al [146] reported that the toxicity of NZVI on soil organisms was higher in vitro assays performed in lab that in soil.…”

“…In the light of these risks and the insufficient understanding of some of the derived hazards, many studies and a clear legislation on this are required. The standardization of the testing methods, transportation, and remediation could significantly reduce some of these lacks [141]. Five points could be considered in future studies in order to reduce these limitations: (1) Improve in the management considering the recovery of NZVI when is possible; (2) evaluations the effects of the NZVI in the living organism considering that they could, in some point, enter in the food chain, so not only on human and wildlife health should be considered, also on lower microorganisms; (3) analysis of the NZVI aging effects and the risks contaminant degradation by-products on the ecotoxicity; (4) the soil nature must be considered in addition to the contaminants present in it; (5) in some cases, it could be considered the combination of nanoremediation with other remediation technologies that improve the biological aspect of the soil, such as bioremediation of phytoremediation.…”

High‐efficiency adsorption of various heavy metals by tea residue biochar loaded with nanoscale zero‐valent iron

“…In addition, the recycling of waste adsorbents is an important and challenging task, since improper handling of these heavy‐metal‐enrich particles could potentially cause serious secondary pollution 12 . Wang et al 13 developed a hydrogen evaluation catalyst from heavy‐metal‐loaded mesoporous zeolite and have proved that the “adsorbent‐to‐photocatalyst” strategy is a promising “trash‐to‐treasure” cycling strategy for waste absorbent disposal.…”