Methylene blue adsorption and color removal from textile dye bath washing wastewater using chitosan–textile waste composite film
摘要
In this study, chitosan–textile waste (chitosan-tw) composite films were prepared with different amounts of textile waste and used for methylene blue (MB) adsorption and for the treatment of real textile dyebath washing wastewater by the adsorption process. Textile waste was carbonized at 600 °C for 1 h and added to chitosan film in different amounts, namely 0.1 g and 0.25 g of textile waste. The highest MB removal was obtained at pH 11, and MB adsorption was found to follow the Langmuir isotherm model. The qmax values for chitosan, chitosan-tw (0.1 g), and chitosan-tw (0.25 g) were calculated as 87.7, 97.1, and 83.3 mg/g, respectively. MB adsorption was monolayered, and the addition of 0.1 g of textile waste to the chitosan film improved MB adsorption. Two different dyebath washing wastewaters were used in the study, and the highest color removals were obtained for dyebath W1 at pH 3 and dyebath W2 at pH 9. For the chitosan-tw film (0.1 g), 81.8% color removal was achieved in dyebath W1 and 82.5% in dyebath W2. In conclusion, the chitosan–textile waste composite film appears to be an effective, sustainable, and low-cost adsorbent for dye and color removal from aqueous media and authentic textile wastewater.