Biosorption of Azo dyes by spent Rhizopus arrhizus biomass

Abstract

In the present study, spent Rhizopus arrhizus biomass was used for the removal of six azo dyes from aqueous solutions. The dye removal capacity of the biomass was evaluated by conducting batch tests as a function of contact time, biomass dosage, pH and initial dye concentrations. The pseudo-second-order kinetic model fitted well with the experimental data with correlation coefficients greater than 0.999, suggesting that chemisorptions might be the rate limiting step. The equilibrium sorption data showed good fit to the Langmuir isotherm model. Among the six dyes tested, the maximum monolayer adsorption capacity for fast red A and metanil yellow was found to be 108.8 and 128.5 mg/g, respectively. These encouraging results suggest that dead Rhizopus arrhizus biomass could be a potential biomaterial for the removal of azo dyes from aqueous dye solution.

Single, simultaneous and consecutive biosorption of Cr(VI) and Orange II onto chemically modified masau stones

“…and pose serious problems, even in minute concentrations (Ferhat et al, 2016). More than 8000 chemical products are associated with the dyeing process with 2% of the annually produced dyes (Almost 10 9 kg, 70% of which are azo dyes) discharged directly in aqueous effluents (Fanun, 2014;Liu et al, 2016;Salvi and Chattopadhyay, 2016). Amongst these azo dyes, Orange II (OII) is one of the most widely used reactive dyes in the textile dyeing industries (Heibati et al, 2015).…”

Decolorization of Azo Dyes using Dried Biomass of Bacillus cereus RC1 and Kocuria kristinae RC3

“…In a similar report, on supplementation of the Rhizopus arrhizus biomass, a rapid decolorization of dye was observed within 15-20 min of exposure; thereafter the process of adsorption was less significant. Within a contact time of 30 and 60 min, respectively, the maximum percentage decolorization of Congo red dye and Fast Red A was attained 19 .…”

“…The medium was maintained at pH7.0 and incubated at 37°C in a shaking incubator (150 rpm). After 24 hrs of incubation, the dye concentration was determined 19 .…”

“…The medium was incubated in a shaker at 37°C for 150 min. The reduction in the dye concentration was recorded at every 30 min interval 19 .…”

Decolorization of Erythrosine B by Rhizopus arrhizus biomass

“…Waste fungal Rhizopus arrhizus biomass has been successively used for removal of azo dyes from aqueous solution (Salvi and Chattopadhyay 2017). As an extension of this study, the present work was aimed at studying the adsorption behaviour of dye EB onto this spent biomass.…”