The effect of thermal setting parameters namely tensile stress, temperature and time on the breaking strength and breaking elongation of hollow polyester (PET) fiber (PorelTM fiber) were investigated, and their synergistic effect was studied via orthogonal experiment. The results show that protection of fiber wall is an important task during thermal finishing process of hollow fiber. There are direct relationships between micro-molecular structure and mechanical properties. Orthogonal experiment analysis shows that the most significant effect factor for breaking strength and breaking elongation are temperature and tensile stress, respectively. The suggested thermal finishing conditions for PorelTM fiber are summarized as following: elongation (viz. tensile stress) 4%, temperature 165°C, and time 60s.

The photocatalyst of Ag doped TiO2 in liquid state was applied to decolorize the Reactive Red 3BS under UV irradiation. The rate of photocatalytic degradation of the dye was improved with increasing the concentration of catalyst from 1 g/L to 8 g/L. But as a result of light attenuation for the rising catalyst concentration, the rate of reaction was constant at 8-12 g/L of the catalyst concentration. The rate of dye photocatalytic degradation decreased with increasing initial concentration of dye. The kinetics of photocatalytic reaction was also studied. The results showed that degradation reaction is congruent with an apparent first-order kinetic equation, and the relationship between apparent reaction rate and initial dye concentration fits approximately a negative second-order kinetic relationship.

The effect of thermal treatment conditions namely water pick-up, temperature and time on the morphological structure, bursting strength and wearabilities of polyester (PET) hollow staple fiber were investigated. The results show that changes in water pick-up, temperature and time may lead to an obvious change in bursting strength, warmth retention and water-vapor permeation of fabric. Scanning Electronic Microscope (SEM) analysis indicates that both thermal treatment temperature and time have a significant effect on the morphological structure and hollow structure, and the critical maximum time mostly depends on the applied temperature. Furthermore, the bursting strength, warmth retention and water-vapor permeation of polyester (PET) hollow staple fiber knitted fabric are determined by its morphological and hollow structure.

A waste material, stove ash, was applied to adsorbthe Direct Red 4BS. The dye amount absorbed by ash was improved with increasingthe dye initial concentration from 3g/Lto 7g/L. Dye was adsorbed within 2minutes and the equilibrium was achieved after 5 minutes. The kinetic of adsorptionreaction was also studied. The results showed that adsorption reaction was congruentwith Lagergren pseudo-second order kinetic equation, and different initial dyeconcentrations had their specific kinetic parameters.