Enhanced Removal of Bordeaux B and Red G Dyes Used in Alpaca Wool Dying from Water Using Iron-Modified Activated Carbon

The aim of this research was to explore the removal of Red G and Bordeaux B dyes from water using a packed bed column with conventional carbon (C_-conv) and iron-modified activated carbon (Formula presented.)). The bands increased in (Formula presented.), corresponding to groups already existing in C_-conv, such as C = C and C-C, and the appearance of new groups, such as C-O, C-Cl, Fe-Cl and Fe-O. The total ash content (C_T) was C_T = (10.53 ± 0.12 and 8.98 ± 0.21)% for C_-conv and (Formula presented.), respectively. A molecular structure in the shape of a cross was noticed in Bordeaux B, which was less complex and smaller than the one in Red G. For fixed-bed columns, the carbon fraction was (0.43 and 0.85) mm. The pH of the adsorbents was 8.55 for C_-conv and 4.14 for (Formula presented.). Breakthrough curves were obtained and the Thomas model (TM) and Yoon–Nelson model (YNM) were applied. The sorption capacity of Bordeaux B on C_-conv and (Formula presented.) was (Formula presented.) : (237.88 and 216.21) mg/g, respectively, but the one of Red G was (Formula presented.) : (338.46 and 329.42) mg/g. The dye removal (R_T) was over 55%.