Application of Adsorption Process for Removal of Direct blue 1 and Direct red 31 dyes From Wastewater Using Tamarix Aphylla Plant

Abstract

This study focuses on the Direct blue 1 (DB-1) and Direct red 31 (DR-31) dyes decolorization from wastewater using a Tamarix Aphylla plant, and low-cost agricultural waste material in a batch process was investigated. Studies were conducted on adsorption and removal as a function of pH (2 to 10), amount of adsorbent (0.25 to 5) g/100 ml, contact time (5 to 180) min, initial dye concentration (10 to 250 )mg/l, and agitation speed (100 to 400) rpm. The Langmuir, Freundlich, and Temkin isotherm models were utilized to model the adsorption data. The equilibrium results from the bio-sorption process fitted the Freundlich isotherm model very well. At an optimum pH 2, 60 minutes of contact time, an adsorbent dosage of 1 g/100 ml, and 1.25 g/100 ml for DB-1 and DR-31, respectively, and 400 rpm of agitation speed, the maximum removal efficiency was 90.2%for DR-1and 89.6% for DB-1. The maximum adsorption capacity for DB-1 was approximately 169.5 mg/g, while the maximum adsorption capacity for DR-31 was approximately 108.7 mg/g. FTIR and SEM analyses have been performed to characterize the adsorbent material. Adsorption kinetics was analyzed using the Elovich kinetic model, together with pseudo-first-order and pseudo-second-order models. The findings demonstrated that the dye adsorption process was by the pseudo-second-order, indicating that chemical sorption was the mechanism behind the adsorption of the dyes. The findings of the removal studies suggested that the Tamarix Aphylla plant might be successfully utilized as an effective and cost-effective adsorbent for the removal of dyes from wastewater.