Valorization of cotton waste generated from the Tunisian textile industry through the production of adsorbents carbonaceous materials

摘要

In this study, activated carbon (AC) was prepared from waste cotton generated from the Tunisian spinning industry. AC was prepared using a carbonization at 700°C followed by a chemical activation (with H3P04 and ZnC12). Thermogravimetric analysis was used to analyze the carbonization step. There was a considerable decrease in weight loss in the region of 280°C to 380°Cattributed mainly to the cellulose degradation. In a second step, the activated carbons were characterized different analytical techniques. In particular, the effect of carbonization and chemical activation on the cross-section and surface was detected with SEM. In addition, FTIR analysis showed the disappearance of many surface groups in range between 2000 cm~(-1) and 4000 cm~(-1) after activation while TPD-MS showed that with the acidic character of the activated carbon with H_3PO_4 comparing to ZnCL_2. ZnCL_2 activated carbon was used for the removal of textile dye, namely Alizarin S from aqueous solution for different experimental conditions. The maximum adsorption capacity of Alizarin S was Q_(max)=181mg/g obtained at pH =3 and T=25°C.