Anchoring Al- and/or Mg-oxides to magnetic biochars for Co-uptake of arsenate and fluoride from water

Shen, Ziyi; Jin, Jie; Fu, Jingjing; Yang, Meng; Li, Feihu

doi:10.1016/j.jenvman.2021.112898

Cited by 23 publications

(1 citation statement)

References 51 publications

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“…Additionally, the parameter n calculated the Freundlich model is often used as an indicator of the easiness or likeliness of a specific adsorption process, with n > 1 indicative of a favorable adsorption process 63 . Note that all the n values are above 1, suggesting that the adsorption of Cu 2+ and Zn 2+ ions over both aged MPs are favorable and easy to proceed under the given conditions, in good agreement with previous reports 22,36,59,64 .…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Insights into the Adsorption of Copper/Zinc Ions over Aged Polyethylene and Polyethylene Terephthalate Microplastics

Ma,

2023

Preprint

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Microplastics (MPs) have aroused growing environmental concerns due to their biotoxicity and vital roles in accelerating the spread of toxic elements. Illuminating the interactions between MPs and heavy metals (HMs) is crucial for understanding the transport and fate of HM-loaded MPs in specific environmentally relevant scenarios. Herein, the adsorption of copper (Cu2+) and zinc (Zn2+) ions over poly-ethylene (PE) and polyethylene terephthalate (PET) particulates before and after heat persulfate oxidation (HPO) treatment was comprehensively evaluated in simulated swine wastewater. The effects of intrinsic properties (i.e., degree of weathering, size, type) of MPs and environmental factors (i.e., pH, ionic strength, and co-occurring species) on adsorption were investigated thoroughly. It was observed that HPO treatment expedites the fragmentation of pristine MPs, and renders MPs with a variety of oxygen-rich functional groups, which are likely to act as new active sites for binding both HMs. The adsorption of both HMs is pH- and ionic strength-dependent at a pH of 4 to 6. Co-occurring species such as humic acid (HA) and tetracycline (TC) appear to enhance the affinity of both aged MPs for Cu2+ and Zn2+ ions via bridging complexation. However, co-occurring nutrient species (e.g., phosphate and ammonia) demonstrate different impacts on the adsorption, improving uptake of Cu2+ by precipitation while lowering affinity for Zn2+ owing to the formation of soluble zinc-ammonia complex. Spectroscopic analysis indicates that the dominant adsorption mechanism mainly involves electrostatic interactions and surface complexation. These findings provided fundamental insights into the interactions between aged MPs and HMs in an environmentally rele-vant scenario (i.e., simulated swine wastewater).

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