Effect of Ultraviolet Irradiation on Thermodynamic, Kinetic and Adsorption Isotherm of Direct dye onto Cellulose Acetate Fabric
Cellulose acetate fibers do not inherently have an affinity for direct dyes. One of the methods to create affinity for this type of dye is saponification of cellulose acetate fibers, which converts some acetate groups to hydroxyl groups. However, the alkaline wastewater from saponification is a high concentration alkaline wastewater. Therefore, other techniques should be investigated to create hydrophilic groups on the surface of these fibers. In this research, cellulose acetate fibers were first exposed to ultraviolet radiation and then chemical and dyeing properties were investigated.SEM micrographs showed that UV pretreatment makes fiber surface rough and porous. Moreover, FT-IR results showed that acetyl groups decreased after UV treatment. Meanwhile, increasing irradiation time led to an increase in color strength and fastness properties. Thermodynamic parameters showed that UV treated fabric had higher affinity for direct dye in comparison to untreated fabric. Freundlich isotherm was found the best model to describe the adsorption of direct dye onto both untreated and UV treated cellulose acetate fabrics. However, UV treated fabric showed higher adsorption capacity in comparison to untreated fabric.
- حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران میشود.
- پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانههای چاپی و دیجیتال را به کاربر نمیدهد.