title: Mechanism of Adsorptive Removal of Methylene Blue Using Dried Biomass of Rhizopus oryzae.
abstract: Adsorption is an efficient way to remove synthetic dyes from industrial effluent. Here, we show mechanism of adsorptive removal of cationic dye methylene blue (MB) from its aqueous solution using dried biomass of Rhizopus oryzae as a biosorbent. The optimum pH and temperature for adsorption was found to be 7.0 and 28 °C, respectively. Scanning electron microscopy (SEM) of the biomass suggested distinct changes in surface topology post-MB adsorption, while Fourier transform infrared (FTIR) study indicated chemical interaction between the surface of the biomass and MB. Chemical modification of -OH and -C=O groups of biomass reduced the MB adsorption and corroborated with the FTIR analyses. Kinetics study revealed that the adsorption rate was fast initially and reached equilibrium at 4 h following a pseudo-second-order-kinetics. The adsorption isotherm followed Freundlich isotherm model with n value of 1.1615.The dried biomass of R. oryzae can be used as a potent biosorbent for the removal of MB.
authors.affiliation: Department of Molecular Biology and Biotechnology, Tezpur University, Tezpur, Assam, 784028, India.
authors.forename: Manash Deep
authors.initials: MD
authors.lastname: Dey
authors.forename: Ruchi
authors.initials: R
authors.lastname: Shukla
authors.forename: Naba K
authors.initials: NK
authors.lastname: Bordoloi
authors.forename: Robin
authors.initials: R
authors.lastname: Doley
authors.forename: Rupak
authors.initials: R
authors.lastname: Mukhopadhyay
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D018533:Biomass; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D003890:Desiccation; D004058:Diffusion; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry / Q000302:isolation & purification*; D012233:Rhizopus / Q000378:metabolism* / Q000648:ultrastructure; D013052:Spectrometry, X-Ray Emission; D013696:Temperature
chemical_list: D004396:Coloring Agents; D008751:Methylene Blue