Novel macroporous, hydrophilic microspheres with a surface layer of crosslinked poly(aspartic acid) were synthesized. In this study, macroporous poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) [poly(GMA-co-EGDMA)] microspheres with pore size around 370 nm were first obtained through the surfactant reverse micelle swelling method, and the poly(GMA-co-EGDMA) was aminated by ethylene diamine to form poly(GMA-NH 2 ). The polysuccinimide was grafted onto the surface of poly(GMA-NH 2 ) microspheres and crosslinked by hexamethylendiamine and γ-aminopropyltriethoxysilane, respectively, and then hydrolyzed to obtain the poly(aspartic acid)-functionalized macroporous microspheres. The functionalized hydrophilic microspheres were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis, mercury porosimetry, and elemental analysis. The metal ion adsorption capacity was also studied. The FTIR, XPS, and elemental analysis confirmed the poly(aspartic acid) functionalization of the poly(GMA-co-EGDMA) microspheres. SEM and mercury porosimetry showed there was little effect of this surface chemical modification on microsphere porosity, and the obtained macroporous microspheres exhibited excellent thermal stability and adsorption for Ag(I), presenting great potential for applications in adsorption, fixation, and separation.

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The treatment of dye wastewater is of great significance to environmental protection. In addition, corrugated boxes are the main materials used in express packaging in the Internet shopping era, and its recycling has great value for sustainable development. In this study, cellulose triacetate (CTA) was successfully synthesized from discarded corrugated boxes with iodine as catalyst. And the obtained CTA was prepared by the emulsion solvent evaporation method into porous CTA particles, which can be used as an adsorbent to remove the dye crystal violet (CV). The adsorption kinetic and adsorption isotherm models revealed that the adsorption process was a single‐layer adsorption process with equal adsorption sites. The removal efficiency (R) of the CV solution (40 mg/L) at about 50 min R reaching equilibrium and was over 98%. The estimated maximum adsorption capacities for CV reached 9.1116 mg g−1. This research provides a new idea for the preparation of low‐cost dye wastewater treatment materials.

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