Immobilization of modified hydroxyapatite particles onto PET filter fabric for adsorption property

Polymer chains were introduced to esterified hydroxyapatite particle surface with methacrylic acid for modification and subsequently modified particles were immobilized onto PET filter fabric via heat fusion method to impart adsorption property. The polymerization process of methyl methacrylate on esterified hydroxyapatite surface was optimized and effects of treating time, temperature, particle size, and concentration on immobilization ratio and pore size of filter fabric were discussed. FTIR were applied to characterize the structure of modified hydroxyapatite and treated PET filter fabric. TG was used to determine average chain length of grafted polymer on particles. The results showed that polymer chain with length of 13.57 (mole ratio to hydroxyapatite) was introduced to particle surface and modified particles were embedded onto PET filter fabric with a hydroxyapatite immobilization ratio of 63.6% and pore size of 102.3 µm under optimum conditions. Cadmium adsorption amount of 118.4 mg/g was achieved at the cadmium concentration of 392.8 mg/L, implying that PET filter fabric has adsorption ability toward heavy metal ions.