Keywords: 
• non-living biomass materials /
• reactive billiant red X-3B /
• adsorption

Abstract: Adsorption of reactive billiant red X-3B by four nonliving biomass materials (rice wine distilled residues, peanut shell, grapefruit peel, and straw) was studied in simulated wastewater. The results indicated that adsorption rate of reactive billiant red X-3B could be up to 80 percent in solution with initial reactive billiant red X-3B concentration of 100 mg/L, pH from 1.0 to 2.0, and four selective adsorbent concentration of 10 mg/L. The maximum adsorption capacity was in order: rice wine distilled residues(58.8 mg/g)>peanut shell(28.0 mg/g)>grapefruit peel(23.6 mg/g)>straw(19.5 mg/g), after the adsorption process of reactive billiant red X-3B tended to equilibrium in 60 minutes. Distilled residues could be a two-fold decrease in adsorbent concentration, and a onefold increase in adsorption capacity at more pH range from 1.0 to 6.0 than other three adsorbents when the maximum adsorption rate of reactive billiant red X-3B was achieved. Rice wine distilled residues was attractive adsorbents for removing reactive billiant red X-3B from dye wastewater, compared with peanut shell, grapefruit peel and straw. Mathematical model simulation showed that the adsorption process by distilled residues and grapefruit peel better followed the Freundlich adsorption isotherm, and the adsorption process by peanut shell and straw better followed the Langmuir adsorption isotherm. Kinetic studies showed that the adsorption process by four adsorbents was found to better follow pseudo second order kinetics equation.