Biosorption of crystal violet dye using inactive biomass of the fungus Diaporthe schini

Abstract

An inactive biomass of a new fungus recently discovered, Diaporthe schini, was evaluated for the biosorption of crystal violet (CV) in simulated textile effluents. The characterization assays were performed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and N2 adsorption/desorption isotherms. The influences of pH and biosorbent dosage on the biosorption capacity were evaluated. Kinetics, equilibrium and thermodynamic studies were also carried out. Characterization techniques showed an amorphous biosorbent, with a rough surface containing irregular particles and surface area of 6.5 m2 g−1. The most adequate values of pH and biosorbent dosage were 7.5 and 0.4 g L−1, respectively. The Elovich kinetic model and the Sips equilibrium model were suitable to fit the experimental data. The biosorption capacity increased with temperature, reaching a maximum biosorption capacity of 642.3 mg g−1 at 328 K. The biosorption was a spontaneous and endothermic process. Diaporthe schini inactive biomass was an interesting biosorbent to treat colored effluents, presenting efficiency of 87% in the decolorization of a simulated dye house effluent.

Bathurst Burr (Xanthium spinosum) Powder—A New Natural Effective Adsorbent for Crystal Violet Dye Removal from Synthetic Wastewaters

“…The increase of adsorbent amount has a positive effect on the dye removal efficiency and a negative effect on the adsorption capacity. A similar phenomenon has been reported for this dye adsorbed using: eggshells [ 4 ], Ocotea puberula bark powder [ 5 ], pinus bark powder [ 14 ], lemongrass leaf combined with cellulose acetate [ 42 ], functionalized multi-walled carbon nanotubes [ 50 ], and inactive biomass of Diaporthe schini [ 51 ]. The increase of the adsorbent material dose leads to an increase of adsorption surface; therefore, removal efficiency of the dye will be higher [ 11 , 14 , 18 , 50 ].…”

“…The reported decrease of the adsorption capacity (q e ) can be explained based on the assumption that even if the adsorption sites number increases, many of them remain unsaturated. Other phenomenon such as agglomeration of adsorbent material particles may also occur [ 4 , 23 , 50 , 51 ].…”

“…Similar effects were mentioned for other adsorbents used to retain crystal violet: eggshells [ 4 ], Ananas comosus (pineapple) leaf powder [ 18 ], and corn stalk [ 23 ]. The increase of the adsorption capacity can be attributed to the fact that a high initial dye concentration leads to an increase of the concentration gradient between the dye solution and the adsorbent surface, leading to an increase of the driving force that favors the external mass transfer [ 4 , 11 , 18 , 51 , 52 ]. At the same time, the number of collisions between dye molecules and adsorbent particles material are favored, intensifying adsorption [ 53 ].…”

Diversity of Synthetic Dyes from Textile Industries, Discharge Impacts and Treatment Methods

“…This original methodology is taking place as a significant, large-scale solution for textile industries due to the speed of cleaning and reduction of certain pollutants to near-zero levels [74]. Nanomaterials could be synthesized based on plant extracts [75,76], metals and metal oxides [77,78], carbon [79] and nanocomposites [80]. However, it is important to know that the elimination of nanoparticles after water purification needs to be addressed [81].…”

Biosorption: A Review of the Latest Advances

“…Including uranium, the biosorption technique has recently been shown to be useful for removing metals from radioactive liquid organic waste. Rice and coffee husks (raw and chemically activated) were examined regarding their capacity to remove U(total), 241 Am and 137 Cs, demonstrating that these materials can be used for the treatment of this waste [110].…”