Abstract
This work assessed the feasibility of recovering exhausted high-silica ZSM-5 for the first time. High-silica ZSM-5 (HSZSM-5) loaded with sulfamethoxazole (SMX) was regenerated by water-dissolved ozone. Results showed that 97% recovery of adsorption capacity of regenerated HSZSM-5 was obtained at 2.54 mg/L of ozone after 15 min reaction. Lower SiO2/Al2O3 ratio of HSZSM-5 and initial SMX concentration had a higher recovery ratio of adsorption capacity of regenerated HSZSM-5. The sequential HSZSM-5 adsorption (AD) and ozone oxidation (OZ) experiments were also performed to investigate the effect of pH on the regeneration efficiency of loaded HSZSM-5 and the regeneration mechanism was characterized by fourier-transform infrared spectroscopy, X-ray diffraction and thermogravimetric analysis. No degraded isoxazole ring of SMX adsorbed in the sinusoidal channels of HSZSM-5 was responsible for the decreased recyclability of HSZSM-5. Higher ozone activity of deprotonated SMX at higher pH (>pKa2) favored the HSZSM-5 regeneration. High silica zeolite-based sequential AD-OZ process may be a sustainable way for the removal of organic micropollutants from water.
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