Heavy metal ion pollution in water and soil is a formidable environmental problem. Due to their desired heavy metal capture capacity and excellent chemical and physical stability, resin chelating ligands have been widely used in heavy metal adsorption. In this Review, we outline the latest progress in chelating resin adsorbents toward heavy metals. This paper reviews the methods of selectively separating the target ions in various solutions and screens the excellent performances of chelating resins; the types and synthesis methods of chelating resins are also summarized. Different adsorption mechanisms existing between chelating resins and heavy metal ions are summarized, and the influencing factors of the adsorption processes are analyzed. On this basis, we propose the opportunities, challenges, and prospects faced by researchers studying chelating resin materials in the adsorption of heavy metals, and the reasonable design of advanced chelated resin-based adsorption systems should achieve an eco-friendly and sustainable environment.

No abstract

Microplastics (MPs) have been proven to be one of the major threats to the wastewater treatment system. However, the impact of MPs on microalgae-based wastewater treatment technology are still unknown. In this study, effects of polyvinyl chloride (PVC), polypropylene (PP), and polyethylene (PE) on the removal of nitrogen and phosphorus from synthetic piggery digestate by microalgae were investigated. Results show that the effect of PVC particle size on the growth of microalgae was significant. The effects of PVC content, PP particle size and content, PET particle size and content on the growth of microalgae were all not significant. The removal of ammonia nitrogen by microalgae was influenced significantly by PVC particle size and content, PP particle size and content, the effects of PET particle size and content on the removal of ammonia nitrogen were all not significant. The effects of particle size and content for three MPs on the removal of total phosphorus were all significant. Microalgae cells were bound together after being adsorbed by MPs, which increased the secretion of extracellular polymers and influenced the removal of ammonia nitrogen and total phosphorus.