Abstract: In recent years, the removal of heavy metal ions is one of the difficult problems faced by water treatment under complex environments. Characterized by high-temperature resistance and strong acid resistance, three-dimensional SiO₂ prepared by electrospinning is an ideal precursor material for water treatment in complex environments. SiO₂@PEBS nanofiber cotton was prepared by in situ polymerization of ethylene benzenesulfonic acid and diethylbenzene monomer catalyzed by initiator azobisisobutyronitrile on three-dimersional SiO₂ nanofiber cotton as the substrate, realizing the uniform coating of polyvinylbenzene sulfonate acid on the surface of SiO₂ nanofiber cotton. The morphology and chemical composition of SiO₂@PEBS nanofiber cotton were revealed using SEM and FT-IR, and the thermal stability of the sample was tested with a thermogravimetric analyzer. The adsorption regeneration performance of nanofiber fiber wool under high temperature and acidic conditions was investigated. The results show that SiO₂@PEBS nanofiber cotton has high adsorption capacity on Cu²⁺, Cd²⁺ and Pb²⁺. Under pH value of 5.5 and initial ion concentration of 100 mg/L, the adsorption capacity of Cu²⁺, Cd²⁺ and Pb²⁺ is 73.0, 91.0 and 161.0 mg/g, respectively. At 80 ℃, the adsorption capacity still reaches 81.0, 64.0 and 123.0 mg/g, respectively. The adsorption process conforms to pseudo second-order kinetics and Langmuir isothermal adsorption, with high regeneration performance. After 10 times ion adsorption and desorption cycles, the capacity retention rates for Cu²⁺, Cd²⁺ and Pb²⁺ are 83.5%, 81.1% and 77.6%, respectively.

Key words: in situ polymerization coating, SiO₂ nanofiber cotton, electrospinning, water treatment, heavy metal, adsorption