Efficiency of TiO₂ particle-coated filter using different binders in carbendazim degradation from Chinese chives

Dip-coating TiO₂ (Degussa P25) onto the glass-fiber pre-filter using different binders (PEG1000, 2000, 4000, 6000, and Duramax B1000) for carbendazim degradation in Chinese chives was studied. To investigate the effects of binder types, TiO₂ concentration was fixed at 1 % w/v, and amounts of binders were varied in a range of 0.3 to 1 wt% based on the TiO₂ content. Then, effects of TiO₂ and binder concentrations were further studied on the most effective binder type (PEG6000). It was revealed that 2 wt% of PEG6000 yielded the highest carbendazim degradation efficiency. The efficiency increased with the increased concentration of TiO₂. At the best condition of coating, i.e., 1-1.5 % w/v of TiO₂ and 2 wt% of PEG6000, more than 90% degradation efficiency was obtained although the initial carbendazim concentration in the chives was as high as 168.4 mg/kg.