Hungarian and Indonesian rice husk as bioadsorbents for binary biosorption of cationic dyes from aqueous solutions: A factorial design analysis

The wastewater of the dye industry can be characterized by a complex chemical composition and consists numerous dyes. Bioadsorbents are increasingly applied for biosorption dyes because they inexpensive environmentally friendly. Rice husk (RH) is potential agricultural waste that converted into bioadsorbents cationic Herein, removal methylene blue (MB) basic red 9 (BR9) Hungarian rice (HRH) Indonesian (IRH) using binary was investigated. Adsorbents were zeta potential, Fourier-transform infrared spectroscopy, scanning electron microscopy. Batch evaluated influence different variables, including pH, adsorbent dose, contact time, initial concentrations. Several factors MB BR9 onto assessed main effect, Pareto charts, normal probability plots, interaction effect in factorial design. optimum time 60 min. Isotherm kinetic models fitted to Brunauer–Emmett–Teller multilayer Elovich equation based on correlation coefficients nonlinear chi-square. Results showed capacity HRH 10.4 mg/g 10 BR9; values IRH 9.3 9.6 mg/g, respectively. Therefore, found effective adsorbents removing via biosorption.