Comparative Desorption Studies on Remediation of Remazol Dyes Using Biochar (Sorbent) Derived from Green Marine Seaweeds

Abstract

AbstractIn this work, regeneration of Remazol dye loaded biochar produced from three different green marine seaweeds namely U.lactuca, U.reticulata and C.scalpelliformis was studied using different elutants as a regenerant. Before the regeneration, remediation of remazol dyes were studied in batch trails and U. Lactuca derived biochar is found to best ‐suited biochar for the remediation all four remazol dyes with a removal efficiency in the order of Remazol brilliant orange 3R (91%), followed by Remazol brilliant blue R (89.6%), Remazol brilliant violet 5R (84.2%) and Remazol Black B (77.8%). Further Remazol brilliant orange 3R is studied for the remediation of real wastewater and also continuous remediation of dyes is performed. The present work aspires to find the best regenerant for dye loaded biochars. From the investigation NaOH(0.01 M) is found to be the best elutant for all the three different biochars. Desorption efficiency for U. lactuca biochar loaded remazol dyes were between 99.3 to 99.7%, U. reticulate biochar loaded remazol dyes were between 99.4 to 99.8% and for C. scalpelliformis biochar loaded remazol dyes were between 99.2 to 99.6%. The impacts of S/L ratio on the elution efficiency of NaOH towards dye‐bounded biochar were examined. The results indicated that elution efficiency of NaOH remain unaltered until S/L ratio=5 and additional enhancement of S/L ratio caused significant decrease in elution efficiency for all systems.